Compaq dc7900 Service Reference Guide: HP Compaq dc7900 Business PC
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- Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 1
Service Reference Guide HP Compaq dc7900 Business PC - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 2
HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP -Packard Company. Service Reference Guide Business PCs First Edition (September 2008) Document Part - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 3
About This Book WARNING! Text set off in this manner indicates that failure to follow directions could result in bodily harm or loss of life. CAUTION: Text set off in this manner indicates that failure to follow directions could result in damage to equipment or loss of information. NOTE: Text set - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 4
iv About This Book - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 5
or Upgrading Device Drivers 1 HP Backup and Recovery Manager ...2 2 Computer Setup (F10) Utility Computer Setup (F10) Utilities ...3 Using Computer Setup (F10) Utilities 4 Computer Setup-File ...5 Computer Setup-Storage 6 Computer Setup-Security 8 Computer Setup-Power 12 Computer Setup-Advanced - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 6
Computer 34 Copying to Multiple Computers 35 Creating a Bootable Device 36 Supported USB Flash Media Device 36 Unsupported USB Flash Media Device 37 Dual-State Power Button ...38 HP Web Site Support 49 Drive Protection System ...49 Surge-Tolerant Power Supply 49 Thermal Sensor ...50 vi - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 7
SATA Power Cable ...52 PATA Device Information ...53 ATA SMART Drives ...53 Hard Drive Capacities ...53 6 Identifying the Chassis, Routine Care, and Disassembly Preparation Chassis Designations ...54 Convertible Minitower (CMT 54 Small Form Factor (SFF 55 Ultra-Slim Desktop (USDT 55 Electrostatic - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 8
Battery ...110 Type 1 Battery Holder ...111 Type 2 Battery Holder ...111 Type 3 Battery Holder ...112 Changing from a Minitower to a Desktop Configuration 113 Changing from a Desktop to a Minitower Configuration 115 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis Preparation - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 9
...168 Power Supply ...169 System Board ...171 Backwall ...172 Battery ...173 Type 1 Battery Holder ...174 Type 2 Battery Holder ...174 Type 3 Battery Holder ...175 Using the Small Form Factor Computer in a Tower Orientation 176 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 10
...216 ATA/ATAPI (IDE) Standard Drive Cable 217 CD-ROM 50-Pin Connector ...218 24-Pin Power ...218 24-Pin MicroFit Power (CMT, SFF 219 4-Pin Power (for CPU) ...219 6-Pin Power (for CPU) (CMT, SFF 219 SATA Data and Power ...220 PCI Express ...220 PCI Express ...221 PCI Express Mini Card ...222 DVI - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 11
and Audible Codes 233 Appendix D Troubleshooting Without Diagnostics Safety and Comfort ...237 Before You Call for Technical Support 237 Helpful Hints ...238 Solving General Problems ...240 Solving Power Problems ...243 Solving Diskette Problems ...244 Solving Hard Drive Problems ...247 Solving - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 12
xii - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 13
loaded, you will be prompted to register the computer with HP Total Care before installing the operating system. You will see a brief movie followed by an online registration form. Fill out the form, click the Begin button, and follow the instructions on the screen. CAUTION: Do not add optional - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 14
Backup and Recovery Manager, refer to the HP Backup and Recovery Manager User Guide by selecting Start > HP Backup and Recovery > HP Backup and Recovery Manager Manual. NOTE: You can order a Recovery Disc Set from HP by calling the HP support center. Go to the following Web site, select your region - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 15
change, or verify the system configuration, including settings for processor, graphics, memory, audio, storage, communications, and input devices. ● Modify the boot order of bootable devices such as hard drives, diskette drives, optical drives, or USB flash media devices. ● Enable Quick Boot, which - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 16
but not automatically fixed during the Power-On SelfTest (POST). ● Replicate the system setup by saving system configuration information on diskette and restoring it on one or more computers. ● Execute self-tests on a specified ATA hard drive (when supported by drive). ● Enable or disable DriveLock - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 17
core processors have this listed twice) ● Installed memory size/speed, number of channels (single or dual) (if applicable) ● Integrated MAC address for embedded, enabled NIC (if applicable) ● System BIOS (includes family name and version) ● Chassis serial number ● Asset tracking number ● ME firmware - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 18
Type ATAPI Zip drive: ● None (treated as Other). ● Diskette (treated as diskette drive). Legacy Diskette: No emulation options available. CD-ROM: No emulation options available. ATAPI LS-120: ● None (treated as Other). ● Diskette (treated as diskette drive). Hard Disk: ● None (prevents BIOS - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 19
Advanced Host Controller Interface (AHCI) and Redundant Array of Independent Disks (RAID) on HP Compaq dc7900 Business PCs white paper at http://www.hp.com for more information. NOTE: RAID is not available on USDT systems. Max eSATA Speed Allows you to choose 1.5 Gbps or 3.0 Gpbs as the maximum - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 20
device, diskette drive, hard drive, optical drive, or network Computer Setup options, flash the ROM, and make changes to certain plug and play settings under Windows. Power-On Password See the Desktop Management Guide for more information. Allows you to set and enable a power-on password. The power - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 21
to boot the computer if the sensor detects that the cover has been removed. This feature is supported on some models only. See the Desktop Management Guide for more information. Device Security Allows you to set Device Available/Device Hidden for: ● Serial ports ● Parallel port ● System audio - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 22
, the hard drive will remain inaccessible until one of the passwords is successfully provided during a subsequent cold-boot sequence. NOTE: This selection will only appear when at least one drive that supports the DriveLock feature is attached to the system. See the Desktop Management Guide for - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 23
computer off and then back on. ● Reset authentication credentials (some models) (Do not reset/Reset) - Selecting Reset disables the power-on authentication support with invalid passwords. The choice, None, is replaced by Power-On Password if a Power-On Password is enabled. NOTE: Setup Browse Mode - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 24
-Extended/Normal. Allows certain operating systems to decrease the processors power consumption when the processor is idle. ● ACPI S3 Hard Disk Reset-Enabling this causes the BIOS to ensure hard disks are ready to accept commands after resuming from S3 before returning control to the operating - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 25
source (remote server/local hard drive). ● After Power Loss (off/on/previous state): Setting this option to: ◦ Off-causes the computer to remain powered off when power is restored. ◦ On-causes the computer to power on automatically as soon as power is restored. Computer Setup (F10) Utilities 13 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 26
the POST memory test. (some models) BIOS Power-On Allows you to set the computer to turn on automatically at a time you specify. Onboard Devices PCI Devices Allows you to set resources for or disable onboard system devices (diskette controller, serial port, or parallel port). ● Lists currently - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 27
PXE Option ROM Download (enable/disable). The BIOS contains an embedded NIC option ROM to allow the unit to boot through the network to a PXE server. This is typically used to download a corporate image to a hard drive. The NIC option ROM takes up memory space below 1MB commonly referred to as DOS - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 28
Table 2-6 Computer Setup-Advanced (for advanced users) (continued) administrator. This option determines if the BIOS will keep the any modified computer configuration settings to a diskette, a USB flash media device, or a diskette-like device (a storage device set to emulate a diskette drive) and - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 29
) and click Next. 3. Follow the instructions in the wizard to create a Recovery Disc Set. 4. Use Windows Explorer to search the Recovery Disc Set for the CD with the compaq\hpdiags directory. 5. While the computer is on, insert the CD into an optical drive on the computer. HP Insight Diagnostics 17 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 30
Provides system BIOS and PCI device information. Asset Control-Shows product name, asset tag, system serial number, and processor information. Communication-Shows information about the computer parallel (LPT) and serial (COM) port settings, plus USB and network controller information. Graphics-Shows - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 31
also choose the type of test and testing mode. There are three types of tests to are run. For each test type, there are two test modes the Test tab. 2. Select the tab for the type of test you want to run: Quick, Complete, or status of the selected tests. The type of test executed (Quick, Complete - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 32
replaced the type of Code provides a numerical code for the failure. The error codes are HP Insight Diagnostics tab, an Error Codes tab, and a Test Components tab. The HP problem. To find an error code description quickly, enter the code in the box at the top of the tab and click the Find Error Codes - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 33
then remove the CD from the optical drive. Downloading the Latest Version of HP Insight Diagnostics 1. Go to http://www.hp.com. 2. Click the Software & Drivers link. 3. Select Download drivers and software (and firmware). 4. Enter your product number (for example, dc7900) in the text box and press - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 34
Backup and Recovery Manager, refer to the HP Backup and Recovery Manager User Guide by selecting Start > HP Backup and Recovery > HP Backup and Recovery Manager Manual. NOTE: You can order a Recovery Disc Set from HP by calling the HP support center. Go to the following Web site, select your region - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 35
-based solutions for managing and controlling desktops, workstations, and notebook PCs in a networked environment. HP pioneered desktop manageability in 1995 with the introduction of the industry's first fully manageable desktop personal computers. HP is a patent holder of manageability technology - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 36
of system software, configuration management and troubleshooting, and power management. NOTE: See HP Backup and Recovery Manager on page 2 for information on creating a Recovery Disc Set. HP Software Agent The management agent used by both HP Client Automation Standard and Enterprise Editions is - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 37
computer is booting up. Follow the instructions on the screen to continue the process. The default boot order is a BIOS configuration setting that can be changed to always attempt to PXE boot. Software Updating and Management HP provides several tools for managing and updating software on desktops - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 38
how you manage your HP client computers. HP Client Management Interface used in conjunction with system management software can: ● Request in-depth client inventory information-Capture detailed information about the processors, hard drives, memory, BIOS, drivers, including sensor information (such - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 39
: ● The Starter Edition is a free product for managing HP desktops, notebooks and workstations, providing hardware and software inventory, remote control, HP alert monitoring, HP BIOS and driver updates, integration with HP Protect Tools and add-on support for Intel AMT. The Starter Edition also - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 40
drivers and BIOS updates without visiting each PC ● Remotely configure BIOS and security settings ● Automate processes to quickly resolve hardware problems Tight integration with HP Instant Support tools reduces hardware troubleshooting time. ● Diagnostics-remotely run & view reports on HP desktop - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 41
HP business PCs. The catalog file contains detailed platform information on HP business desktops, notebooks and workstations. It can be used in conjunction with the custom inventory and update features of Microsoft products to provide automated driver and patch updates to managed HP client computers - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 42
, see the white papers at http://www.hp.com/ support. Select your country and language, select See support and troubleshooting information, enter the model number of the computer, and press Enter. In the Resources category, click Manuals (guides, supplements, addendums, etc.). Under Quick jump to - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 43
the same time, but both are supported. To configure Intel vPro systems for AMT or ASF: 1. Turn on or restart the computer. If you are in Microsoft Windows, ) ◦ Intel ® ME Firmware Local Update (enable/disable) ◦ Intel ® ME Features Control ◦ Intel ® ME Power Control ● Intel ® AMT Configuration ◦ - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 44
's Choice Subscriber's Choice is a client-based service from HP. Based on your profile, HP will supply you with personalized product tips, feature articles, and/or driver and support alerts/notifications. Subscriber's Choice Driver and Support Alerts/Notifications will deliver e-mails notifying you - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 45
ROM from being unintentionally updated or overwritten. This is important to ensure the operating integrity of the computer. Should you need or want to upgrade the BIOS, you may download the latest BIOS images from the HP driver and support page, http://www.hp.com/support/files. CAUTION: For maximum - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 46
off. 4. Remove the removable media used to upgrade the BIOS. 5. Turn the power on to restart the computer. NOTE: BitLocker prevents Windows Vista from booting when a CD containing the BIOS image file is in an optical drive. If BitLocker is enabled, remove this CD before attempting to boot to Windows - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 47
. See Supported USB Flash Media Device on page 36 or Unsupported USB Flash Media Device on page 37. CAUTION: Not all computers can be booted from a USB flash media device. If the default boot order in the Computer Setup (F10) Utility lists the USB device before the hard drive, the computer can be - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 48
SYS.COM or FORMAT.COM into a diskette drive and turn on the computer to boot to the DOS diskette. 4. Run FDISK from the A:\ prompt by typing FDISK and pressing Enter. If prompted, click Yes (Y) to enable large disk support. 5. Enter Choice [5] to display the drives in the system. The USB flash media - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 49
have SCSI, ATA RAID or SATA drives attached, turn off the computer and unplug the power cord. CAUTION: The power cord MUST be unplugged. 2. Open the computer and remove the PCI cards. 3. Insert the USB flash media device into one of the computer's USB ports and remove all other USB storage devices - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 50
will boot to the USB flash media device as drive C. NOTE: The default boot order varies from computer to computer, and it can be changed in the Computer Setup (F10) Utility. Refer to the Computer Setup (F10) Utility for instructions. If you have used a DOS version from Windows 9x, you may see - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 51
for four seconds. CAUTION: Do not use the power button to turn off the computer unless the system is not responding; turning off the power without operating system interaction could cause damage to or loss of data on the hard drive. HP Web Site Support HP engineers rigorously test and debug software - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 52
settings on the HP computer: ● Locally, using the Computer Setup Utilities. See the Computer Setup (F10) Utility Guide included with the computer for additional information and instructions on using the Computer Setup Utilities. Some computers also have HP BIOS Configuration for ProtectTools - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 53
computer if the sensor detects that the cover has been removed. This feature is supported on some models only. Device Security Allows you to set Device Available/Device Hidden for: ● Serial ports ● Parallel port ● Rear USB ports ● Front USB ports ● Internal USB ports , the hard drive will remain - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 54
Security Device. Changing this setting requires turning the computer off and then back on. ● Reset authentication credentials (some models) (Do not reset/Reset) - Selecting Reset disables the power-on authentication support and clears the authentication information from the Embedded Security - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 55
, None, is replaced by Power-On Password if a Power-On Password is power-on password, even if one has been established. Establishing a Setup Password Using Computer Setup If the system is equipped with an embedded security device, refer to the HP ProtectTools Security Manager Guide at http://www.hp - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 56
is equipped with an embedded security device, refer to the HP ProtectTools Security Manager Guide at http://www.hp.com. 1. Turn on or restart the computer. If you are in Windows, click Start > Shut Down > Restart the Computer. 2. To change the Power-On password, go to step 3. To change the Setup - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 57
password/new password NOTE: Type carefully; for security reasons, the characters you type do not appear on the HP ProtectTools Security Manager Guide at http://www.hp.com. 1. Turn on or restart the computer. If you are in Windows, click Start > Shut Down > Restart the Computer. 2. To delete the Power - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 58
HP ProtectTools Security Manager Guide at http://www.hp.com. DriveLock DriveLock is an industry-standard security feature that prevents unauthorized access to the data on ATA hard. DriveLock has been implemented as an extension to Computer Setup. It is only available when hard drives that support - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 59
require replacement. Likewise, by not setting a master password, system administrators may find themselves locked out of a hard drive and unable to perform routine checks for unauthorized software, other asset control functions, and support. For users with less stringent security requirements, HP - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 60
HP computers. This lock prevents unauthorized access to the internal components. Computers computer cover. You will need the key in any of the following circumstances: ● Power outage ● Startup failure ● PC component failure (such as processor or power supply) ● Forgotten password 48 Chapter 4 Desktop - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 61
to the hard drive. The service provider can use this information to help diagnose conditions that caused you to run the DPS software. Refer to the Troubleshooting Guide for instructions on using DPS. Surge-Tolerant Power Supply An integrated surge-tolerant power supply provides greater reliability - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 62
Thermal Sensor The thermal sensor is a hardware and software feature that tracks the internal temperature of the computer. This feature displays a caution message when the normal range is exceeded, which gives you time to take action before internal components are damaged or data - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 63
ATA = SATA Parallel ATA = PATA SATA Hard Drives Serial ATA Hard Drive Characteristics Number of pins/conductors in data cable Number of pins in power cable Maximum data cable length Data interface voltage differential Drive voltages Jumpers for configuring drive Data transfer rate 7/7 15 39.37 in - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 64
SATA 3.0 Gb/s cable as it is fully backwards compatible with the SATA 1.5 Gb/s drives. Current HP desktop products ship with SATA 3.0 Gb/s hard drives. SATA data cables are susceptible to damage if overflexed. Never crease a SATA data cable and never bend it tighter than a 30 mm (1.18 in) radius - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 65
Device Information The USDT model is the only product that supports a PATA optical drive. No PATA drives are supported on any other model. ATA SMART Drives The Self Monitoring Analysis and Recording Technology (SMART) ATA drives for the HP Personal Computers have built-in drive failure prediction - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 66
service. CAUTION: When the computer is plugged into an AC power source, voltage is always applied to the system board. You must disconnect the power cord from the power source before opening the computer to prevent system board or component damage. Chassis Designations Convertible Minitower (CMT - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 67
Small Form Factor (SFF) Figure 6-2 Small Form Factor chassis Ultra-Slim Desktop (USDT) Figure 6-3 Ultra-Slim Desktop chassis Chassis Designations 55 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 68
its life expectancy. Networks built into many integrated circuits provide some protection, but in many cases, the discharge contains enough power to alter device parameters or melt silicon junctions. Generating Static The following table shows that: ● Different activities generate different amounts - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 69
be used at standing workstations and are compatible with most types of shoes or boots. On conductive floors or dissipative floor static-free work areas. ● Turn off power and input signals before inserting and removing connectors and Styrofoam. ● Use field service tools, such as cutters, screwdrivers - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 70
mats with hard tie to ground ● Field service kits ● Static desktop unit as this also restricts airflow. ● Occasionally clean the air vents on all vented sides of the computer computer and keyboard. ● Never cover the ventilation slots on the monitor with any type of material. ● Install or enable power - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 71
on page 59 before cleaning the keyboard. To clean the tops of the keys or the keyboard body, follow the procedures described in Cleaning the Computer Case on page 59. When cleaning debris from under the keys, review all rules in General Cleaning Safety Precautions on page 59 before following these - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 72
the power cord from the power source before opening the computer to prevent system board or component damage. Tools and Software Requirements To service the computer, you need the following: ● Torx T-15 screwdriver (HP screwdriver with bits, PN 161946-001) ● Torx T-15 screwdriver with small diameter - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 73
or snagged by parts being removed or replaced. CAUTION: When servicing this computer, ensure that cables are placed in their proper location during the reassembly process. Improper cable placement can damage the computer. Hard Drives Handle hard drives as delicate, precision components, avoiding all - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 74
computer provides power to the real-time clock and has a minimum lifetime of about three years. See the appropriate removal and replacement chapter for the chassis you are working on in this guide for instructions on the replacement procedures. WARNING! This computer HP, their authorized partners - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 75
7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis Adherence to the procedures and precautions described in this chapter is essential for proper service. After completing all necessary removal and replacement procedures, run the Diagnostics utility to verify that all components - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 76
Numbers guide. Using the Smart Cover FailSafe Key to Remove the Smart Cover Lock To open the access panel with the Smart Cover Lock engaged: 1. Prepare the computer for disassembly (Preparation for Disassembly on page 63). 64 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 77
screws that secure the Smart Cover Lock to the chassis. Figure 7-1 Removing the Smart Cover Lock Screws You can now remove the access panel. See Computer Access Panel on page 70. To reattach the Smart Cover Lock, secure the lock in place with the tamper-proof screws. Unlocking the Smart Cover - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 78
computer and/or secure the computer to a fixed object. Installing a Security Lock The security locks displayed below and on the following page can be used to secure the computer. Cable Lock Figure 7-2 Installing a Cable Lock 66 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 79
Padlock Figure 7-3 Installing a Padlock External Security Devices 67 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 80
the Cable to a Fixed Object 2. Thread the keyboard and mouse cables through the lock. Figure 7-5 Threading the Keyboard and Mouse Cables 68 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 81
3. Screw the lock to the chassis using the screw provided. Figure 7-6 Attaching the Lock to the Chassis 4. Insert the plug end of the security cable into the lock (1) and push the button in (2) to engage the lock. Use the key provided to disengage the lock. Figure 7-7 Engaging the Lock External - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 82
panel handle (1), slide the access panel back about 1.25 cm (1/2 inch), then lift it up and off the unit (2). Figure 7-8 Removing the Computer Access Panel To install the access panel, reverse the removal procedure. 70 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 83
for disassembly (Preparation for Disassembly on page 63). 2. Remove the computer access panel (Computer Access Panel on page 70). 3. Push up on the two release tabs (1), then rotate the front bezel away from the chassis to release it (2). Figure 7-9 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 84
replacing the subpanel, ensure that the aligning pins and any remaining bezel blanks are in their proper orientation. The logo on the subpanel should be located at the bottom of the subpanel when properly oriented. 72 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 85
computer. ● Keep cables away from major heat sources like the heatsink. ● Do not jam cables on top of expansion cards or memory a SATA data cable. ● Do not rely on components like the drive cage, power supply, or computer cover to push cables down into the chassis. Always position the cables to - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 86
module Power Supply Cable Connections Power Supply Connector ID P1 P3 P4 P5 P9 P10 P11 Description Main power CPU power 1st Hard drive, SATA0 2nd HDD 1st ODD or 2nd HDD if no ODD present, SATA1 2nd ODD 3rd ODD 74 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 87
timing) and CAS latency 6 DDR2 800 Mhz (6-6-6 timing) ● contain the mandatory JEDEC SPD information In addition, the computer supports: ● 512-Mbit and 1-Gbit non-ECC memory technologies ● single-sided and double-sided DIMMs ● DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 88
in Channel A is not equal to the total memory capacity of the DIMMs in Channel B. In flex mode, the channel populated with the least amount of memory describes the total amount of memory assigned to dual channel 76 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 89
by the slowest DIMM in the system. Installing DIMMs CAUTION: You must disconnect the power cord before adding or removing memory modules. Regardless of the power-on state, voltage is always supplied to the memory modules as long as the computer is plugged into an active AC outlet. Adding or removing - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 90
on the computer. 9. Lock any security devices that were disengaged when the computer access panel was removed. The computer should automatically recognize the additional memory the next time you turn on the computer. 78 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 91
x16 expansion card in the PCI Express x16 slots. For dual graphics card configurations, the first (primary) card must be installed in the PCI Express x16 slot that is NOT downshifted to a x4 slot. To remove, replace, or add an expansion card: 1. Prepare the computer for disassembly (Preparation for - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 92
the back of the chassis. Lift the expansion slot cover from the expansion slot. Figure 7-16 Removing an Expansion Slot Cover 80 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 93
. Lift the card straight up to remove it. Be sure not to scrape the card against other components. Figure 7-17 Removing a Standard PCI Expansion Card c. If you are removing a PCI Express x16 card, pull the retention arm on the back of the expansion socket away from the card and carefully rock the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 94
installed card, if needed. Connect internal cables to the system board, if needed. 11. Reconfigure the computer, if necessary. Refer to the Computer Setup (F10) Utility Guide for instructions on using Computer Setup. 82 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 95
. The hard drive uses 6-32 isolation mounting guide screws, four of which are installed on the hard drive bracket under the access panel. All other drives use M3 metric screws, eight of which are installed on the diskette drive bracket under the access panel. The HP-supplied metric guide screws are - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 96
or products that have magnetic fields such as monitors or speakers. If a drive must be mailed, place the drive in a bubble-pack mailer or other protective packaging and label the package "Fragile: Handle With Care." 84 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 97
Connections Refer to the following illustration and table to identify the system board drive connectors. Figure 7-22 System Board Drive Connections Table 7-3 System Board Drive Connections No. System Board Connector System Board Label 1 SATA0 SATA0 2 SATA1 SATA1 3 SATA2 SATA2 4 SATA3 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 98
drive, hard drive, or media card reader) later on. To verify the type and size of the storage devices installed in the computer, run Computer Setup. Refer to the Computer Setup (F10) Utility Guide for more information. 86 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 99
(Computer Access Panel on page 70). 3. Disconnect the drive cables, as indicated in the following illustrations: CAUTION: When removing the cables, pull the tab or connector instead of the cable itself to avoid damaging the cable. ● If you are removing an optical drive, disconnect the power cable - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 100
board. If the media card reader has a 1394 port, disconnect the 1394 cable from the PCI card. Figure 7-26 Disconnecting the Media Card Reader USB Cable Figure 7-27 Disconnecting the Media Card Reader 1394 Cable 88 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 101
are released so do not tilt the unit and allow the drives to fall out. Figure 7-28 Removing a 5.25-inch Drive in the Desktop Configuration (Optical Drive shown) ● To remove a 3.5-inch drive or a 5.25-inch drive in the minitower configuration, pull up on the green drivelock mechanism (1) for that - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 102
3.5-inch drive bay, pull up on the green hard drive drivelock mechanism (1) for that drive and slide the drive from the drive bay (2). Figure 7-30 Removing a Hard Drive 5. Store the removed drive in anti-static packaging. 90 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 103
The HP-supplied metric screws are black. Refer to Drives on page 83 for an illustration of the extra M3 metric guide screws location. If you are replacing a drive, transfer the guides screws from the old drive to the new one. Figure 7-31 Installing a 5.25-Inch Drive in a Minitower (top) and Desktop - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 104
Board Drive Connections on page 85 for an illustration of the system board drive connectors. 8. Reconfigure the computer, if necessary. Refer to the Computer Setup (F10) Utility Guide for instructions on using Computer Setup. 92 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 105
installed on the hard drive bracket under the access panel. The HP-supplied isolation mounting guide screws are silver and blue. Refer to Drives on page 83 for an illustration of the extra 6-32 isolation mounting guide screws location. If you are replacing a drive, transfer the guides screws from - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 106
connector on the system board in the following order: SATA0, SATA1, SATA2, SATA3. 8. Reconfigure the computer, if necessary. Refer to the Computer Setup (F10) Utility Guide for instructions on using Computer Setup. 94 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 107
Also, if you are replacing the primary hard drive, make sure you have created a Recovery Disc Set to restore the operating system, software drivers, and any software applications that were preinstalled on the computer. If you do not have this CD set, select Start > HP Backup and Recovery and create - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 108
the hard drive (1) and move the thermal sensor away from the carrier (2). Figure 7-37 Removing the Thermal Sensor 4. Remove the four screws from the bottom of the hard drive carrier. Figure 7-38 Removing the Security Screws 96 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 109
the new hard drive in the carrier then slide the hard drive back so that it seats in the SATA connector on the carrier's circuit board. Be sure the connector on the hard drive is pressed all the way into the connector on the carrier's circuit board. Figure 7-40 Replacing the Hard Drive Drives 97 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 110
thermal sensor on top of the hard drive in a position that does not cover the label (1) and attach the thermal sensor to the top of the hard drive with the adhesive strip (2). Figure 7-42 Replacing the Thermal Sensor 98 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 111
the screw on the rear of the carrier to secure the cover in place (2). Figure 7-43 Replacing the Carrier Cover 10. Slide the hard drive carrier into the enclosure on the computer and lock it with the key provided. NOTE: The carrier must be locked for power to be supplied to the hard drive. Drives 99 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 112
the front of the chassis. Figure 7-44 Removing the front I/O, USB, power switch assembly 8. Lift the assembly up and out of the chassis while pulling computer. To reinstall the assembly, reverse the removal procedure. 100 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 113
for disassembly (Preparation for Disassembly on page 63). 2. Remove the computer access panel (Computer Access Panel on page 70). 3. Disconnect the speaker wire from the system board, and remove the wire from the clip on top of the fan - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 114
for disassembly (Preparation for Disassembly on page 63). 2. Remove the computer access panel (Computer Access Panel on page 70). 3. Disconnect the fan control cable from the orient the air flow out of the unit. 102 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 115
(Preparation for Disassembly on page 63). 2. Remove the computer access panel (Computer Access Panel on page 70). 3. Remove the two screws that secure the port to the chassis. 4. Disconnect the cable from the system board 5. Remove the port assembly from the chassis. Figure 7-47 Removing the eSATA - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 116
(Preparation for Disassembly on page 63). 2. Remove the computer access panel (Computer Access Panel on page 70). 3. Unscrew the four captive do so could result in damage that requires replacing the system board. 104 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 117
for disassembly (Preparation for Disassembly on page 63). 2. Remove the computer access panel (Computer Access Panel on page 70). 3. Remove the heatsink (Heatsink on page 104). 4. Pull up on all four shroud tabs simultaneously and slide the shroud from - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 118
for disassembly (Preparation for Disassembly on page 63). 2. Remove the computer access panel (Computer Access Panel on page 70). 3. Remove the heatsink (Heatsink on page 104). pad and place it atop the processor. 106 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 119
may require replacing the system board. NOTE: After installing a new processor onto the system board, always update the system ROM to ensure that the latest version of the BIOS is being used on the computer. The latest system BIOS can be found on the Web at: http://h18000.www1.hp.com/support/files - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 120
of the computer, rotate toward the fan so the power supply clears the lip on the top of the chassis, and then lift the power supply out of the chassis. To install the power supply, reverse the removal procedure. 108 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 121
board toward the front of the computer so that the connectors loosen from the rear of the chassis. 9. Lift the system board out of the computer. Figure 7-54 Removing the system board NOTE: When replacing the system board, you must also change the chassis serial number in the BIOS. System Board 109 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 122
gain access to the battery. 3. Locate the battery and battery holder on the system board. 4. Depending on the type of battery holder on your system board, complete the following instructions to replace the battery: 110 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 123
the battery in the proper position. 4. Replace the computer access panel. 5. Plug in the computer and turn on power to the computer. 6. Reset the date and time and any special system setups using Computer Setup. Refer to the Computer Setup (F10) Utility Guide. Type 2 Battery Holder 1. To release the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 124
3. Replace the computer access panel. 4. Plug in the computer and turn on power to the computer. 5. Reset the date and time and any special system setups using Computer Setup. Refer to the Computer Setup (F10) Utility Guide. 112 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 125
Changing from a Minitower to a Desktop Configuration 1. Prepare the computer for disassembly (Preparation for Disassembly on page 63). 2. Remove the computer access panel (Computer Access Panel on page 70). 3. Remove the front bezel (Front Bezel on page 71). 4. Disconnect all power and data cables - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 126
when installing any drive into the drive bay may result in damage to the drive. 8. Reconnect all power and data cables to the drives in the 5.25-inch drive bays. 9. Remove orientation for the desktop configuration. 114 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 127
Changing from a Desktop to a Minitower Configuration 1. Prepare the computer for disassembly (Preparation for Disassembly on page 63). 2. Remove the computer access panel (Computer Access Panel on page 70). 3. Remove the front bezel (Front Bezel on page 71). 4. Disconnect all power and data cables - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 128
when installing any drive into the drive bay may result in damage to the drive. 8. Reconnect all power and data cables to the drives in the 5.25-inch drive bays. 9. Remove orientation for the minitower configuration. 116 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 129
11. Reposition the subpanel (rotate it 90º) with the logo at the bottom, then snap it back into the bezel. Figure 7-63 Changing from a Desktop to a Minitower Configuration Changing from a Desktop to a Minitower Configuration 117 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 130
8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis Adherence to the procedures and precautions described in this chapter is essential for proper service. After completing all necessary removal and replacement procedures, run the Diagnostics utility to verify that all components - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 131
to access the internal computer components in any of the following circumstances: ● Power outage ● Startup failure ● PC component (for example, processor or power supply) failure ● Forgotten password NOTE: The Smart Cover FailSafe Key is a specialized tool available from HP. Be prepared; order this - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 132
chassis. Figure 8-1 Removing the Smart Cover Lock Screw You can now remove the access panel. See Computer Access Panel on page 125. To reattach the Smart Cover Lock, secure the lock in place with the tamper-proof screw. 120 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 133
External Security Devices The following security devices are used to prevent unauthorized access to the internal components of the computer and/or secure the computer to a fixed object. Installing a Security Lock The security locks displayed below and on the following pages can be used to secure the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 134
Padlock Figure 8-3 Installing a Padlock 122 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 135
HP Business PC Security Lock 1. Fasten the security cable by looping it around a stationary object. Figure 8-4 Securing the Cable to a Fixed Object 2. Thread the keyboard and mouse cables through the lock. Figure 8-5 Threading the Keyboard and Mouse Cables External Security Devices 123 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 136
(1) and push the button in (2) to engage the lock. Use the key provided to disengage the lock. Figure 8-7 Engaging the Lock 124 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 137
be locked in place by installing a security screw provided by HP. The security screw is located on the fan duct inside front bezel (2). Figure 8-8 Installing the Front Bezel Security Screw Computer Access Panel 1. Prepare the computer for disassembly (Preparation for Disassembly on page 118). 2. - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 138
disassembly (Preparation for Disassembly on page 118). 2. Remove the access panel (Computer Access Panel on page 125). 3. Lift up the latch behind the upper To install the front bezel, reverse the removal procedure. 126 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 139
models, there are bezel blanks covering the 3.5-inch and 5.25-inch external drive bays that need to be removed before installing a drive. To remove a bezel blank: 1. Remove the front bezel (Front Bezel (2). Figure 8-12 Removing a 5.25-inch Bezel Blank 4. Replace the front bezel. Bezel Blanks 127 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 140
memory technologies ● single-sided and double-sided DIMMs ● DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not supported NOTE: The system will not operate properly if you install unsupported DIMMs. 128 Chapter 8 Removal and Replacement Procedures Small Form Factor - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 141
4 DIMM4 socket, Channel B White NOTE: A DIMM must occupy the black DIMM1 socket. Otherwise, the system will display a POST error message indicating that a memory module must be installed in the black socket. The system will automatically operate in single channel mode, dual channel mode, or flex - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 142
external drive bay housing and the power supply to access the memory module sockets on the system board. WARNING! To reduce risk of personal injury from hot surfaces, allow the internal system components to cool before touching. 130 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 143
the access panel. 8. If the computer was on a stand, replace the stand. 9. Reconnect the power cord and turn on the computer. 10. Lock any security devices that were disengaged when the access panel was removed. The computer should automatically recognize the additional memory the next time you turn - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 144
on page 118). 2. Remove the access panel (Computer Access Panel on page 125). 3. Locate the correct vacant expansion socket on the system board and the corresponding expansion slot on the back of the computer chassis. 132 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 145
4. Release the slot cover retention latch that secures the PCI slot covers by lifting the green tab on the latch and rotating the latch to the open position. Figure 8-16 Opening the Expansion Slot Retainer 5. - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 146
inside of the chassis to release it from the chassis frame. Be sure not to scrape the card against the other components. Figure 8-19 Removing a PCI Express x16 Expansion Card 134 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 147
not installing a new expansion card, install an expansion slot cover to close the open slot. CAUTION: After removing an expansion card, you must replace it with a new card or expansion slot cover for proper cooling of internal components during operation. 8. To install a new expansion card, hold the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 148
installed card, if needed. Connect internal cables to the system board, if needed. 11. Reconfigure the computer, if necessary. Refer to the Computer Setup (F10) Utility Guide for instructions on using Computer Setup. 136 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 149
Small Form Factor chassis is a very compact computer and proper routing of the internal cables is critical to the operation of the computer. Follow good cable management practices when working inside the computer on components like the drive cage, power supply, or computer cover to push cables down - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 150
speaker Serial port 1st HDD 1st ODD or 2nd HDD if no HDD present 2nd HDD if ODD present eSATA port or extra ODD/ HDD connector Hood lock solenoid Hood sensor Media card reader Flying parallel port header ReadyBoost module 138 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 151
can be configured with a diskette drive, a media card reader, or a secondary internal hard drive covered by a bezel blank. To verify the type, size, and capacity of the storage devices installed in the computer, run Computer Setup. Refer to the Computer Setup (F10) Utility Guide for more information - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 152
hard drive, you must remove the four silver and blue 6-32 isolation mounting guide screws from the old hard drive and install them in the new hard drive. Figure 8-24 Secondary Hard Drive 6-32 Guide Screws Location 140 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 153
25 Extra Optical Drive M3 Guide Screws Location CAUTION: To prevent loss of work and damage to the computer or drive: If you are inserting or removing a drive, shut down the operating system properly, turn off the computer, and unplug the power cord. Do not remove a drive while the computer is on or - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 154
System Board Connector System Board Label 1 SATA0 SATA0 2 SATA1 SATA1 3 SATA2 SATA2 4 eSATA ESATA 5 Diskette Drive FLOPPY 6 Media Card Reader MEDIA Color dark blue white light blue black black black 142 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 155
for disassembly (Preparation for Disassembly on page 118). 2. Remove the access panel (Computer Access Panel on page 125). 3. Rotate the drive cage to its upright position. Figure 8-27 Rotating the Drive Cage Up 4. Disconnect the power cable (1) and data cable (2) from the rear of the optical - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 156
panel (Computer Access Panel on page 125). 3. If you are installing a drive in a bay covered by a bezel blank, remove the front bezel then remove the bezel blank. See Bezel Blanks on page 127 for more information. 144 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 157
: When replacing the drive, transfer the four M3 metric guide screws from the old drive to the new one. Figure 8-31 Installing Guide Screws in the Optical Drive 5. Position the guide screws on the drive into the J-slots in the drive bay. Then slide the drive toward the front of the computer until it - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 158
data cable is routed through these guides before connecting it to the optical drive. 9. Connect the power cable (1) and data cable (2) to the rear of the optical drive. Figure 8-34 Connecting the Power and Data Cables 146 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 159
You must remove the optical drive before removing the external 3.5-inch drive. 1. Follow the procedure in Removing an Optical Drive on page 143 to remove the optical drive and access the 3.5-inch drive. CAUTION: Ensure that the computer is turned off and that the power cord is disconnected from the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 160
, as indicated in the following illustrations: a. If you are removing a diskette drive, disconnect the data cable (1) and power cable (2) from the back of the drive. Figure 8-36 Disconnecting the Diskette Drive Cables 148 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 161
b. If you are removing a media card reader, disconnect the USB cable from the system board. If the media card reader has a 1394 port, disconnect the 1394 cable from the PCI card. Figure 8-37 Disconnecting the Media Card Reader USB Cable Figure 8-38 Disconnecting the Media Card Reader 1394 Cable - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 162
before proceeding. 2. If you are installing a diskette drive or media card reader in a bay covered by a bezel blank, remove the front bezel then remove the bezel blank. See Bezel Blanks on page 127 for more information. 150 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 163
to the 1394 PCI card. NOTE: Refer to System Board Drive Connections on page 142 for an illustration of the system board drive connectors. 5. Replace the optical drive. 6. Replace the front bezel and access panel. 7. If the computer was on a stand, replace the stand. 8. Reconnect the power cord and - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 164
, software drivers, and any software applications that were preinstalled on the computer. If you do not have this CD set, select Start > HP Backup and Recovery and create it now. The preinstalled 3.5-inch hard drive is located under the power supply. To remove and replace the hard drive: 1. Prepare - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 165
4. Rotate the power supply to its upright position. The hard drive is located beneath the power supply. CAUTION: If the computer has a Smart Cover Lock installed next to the drive cage, carefully route all cables around the Smart Cover Lock assembly as you raise the power supply to avoid damage to - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 166
44 Removing the Hard Drive 7. To install a hard drive, you must transfer the silver and blue isolation mounting guide screws from the old hard drive to the new hard drive. Figure 8-45 Installing Hard Drive Guide Screws 154 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 167
the drive cage for external drives and the power supply down to their normal positions. NOTE: If you are replacing the primary hard drive, use the Recovery Disc Set to restore the operating system, software drivers, and any software applications that were preinstalled on the computer. Drives 155 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 168
the hard drive carrier with the key provided and slide the carrier out of the enclosure. 2. Remove the screw from the rear of the carrier (1) and slide the top cover off the carrier (2). Figure 8-47 Removing the Carrier Cover 156 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 169
3. Remove the adhesive strip that secures the thermal sensor to the top of the hard drive (1) and move the thermal sensor away from the carrier (2). Figure 8-48 Removing the Thermal Sensor 4. Remove the four screws from the bottom of the hard drive carrier. Figure 8-49 Removing the Security Screws - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 170
that it seats in the SATA connector on the carrier's circuit board. Be sure the connector on the hard drive is pressed all the way into the connector on the carrier's circuit board. Figure 8-51 Replacing the Hard Drive 158 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 171
of the carrier to hold the drive securely in place. Figure 8-52 Replacing the Security Screws 8. Place the thermal sensor on top of the hard drive in a position that does not cover the label (1) and attach the thermal sensor to the top of the hard drive with the adhesive strip (2). Figure 8-53 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 172
Figure 8-54 Replacing the Carrier Cover 10. Slide the hard drive carrier into the enclosure on the computer and lock it with the key provided. NOTE: The carrier must be locked for power to be supplied to the hard drive. 160 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 173
Fan Shroud 1. Prepare the computer for disassembly (Preparation for Disassembly on page 118). 2. Remove the access panel (Computer Access Panel on page 125). 3. Lift the fan shroud straight up out of the chassis. Figure 8-55 Removing the fan shroud To install the fan - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 174
for disassembly (Preparation for Disassembly on page 118). 2. Remove the access panel (Computer Access Panel on page 125). 3. Remove the front bezel (Front Bezel on page 126). sure to orient the air flow into the unit. 162 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 175
sensor is installed in the top of the baffle that is attached to the chassis fan. 1. Prepare the computer for disassembly (Preparation for Disassembly on page 118). 2. Remove the access panel (Computer Access Panel on page 125). 3. Remove the front bezel (Front Bezel on page 126). 4. Remove the fan - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 176
drive cage to gain access to the hole for the LED. When installing the power switch, you may need to first insert one clip and the power button, then use a flat-blade screwdriver to help guide the other clip into its slot. 164 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 177
for disassembly (Preparation for Disassembly on page 118). 2. Remove the access panel (Computer Access Panel on page 125). 3. Remove the front bezel (Front Bezel on page 126). 4. Rotate the drive cage to its upright position. 5. Disconnect the speaker wire from the system board. 6. Remove the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 178
secures the Smart Cover Lock to the back of the chassis, and then remove the Smart Cover Lock from the computer. Figure 8-61 Removing the Smart Cover Lock To install the Smart Cover Lock, reverse the removal procedure 166 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 179
Preparation for Disassembly on page 118). 2. Remove the access panel (Computer Access Panel on page 125). 3. Remove the fan shroud (Fan as the pins on the socket are very fragile and any damage to them may require replacing the system board. 6. Lift the heatsink from atop the processor and set it on - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 180
processor and the bottom of the heatsink with an alcohol pad supplied in the spares kit. After the alcohol has evaporated, apply thermal grease to the top of the processor from the syringe supplied in the spares kit. 168 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 181
replacing the system board. NOTE: After installing a new processor onto the system board, always update the system ROM to ensure that the latest version of the BIOS is being used on the computer. The latest system BIOS can be found on the Web at: http://h18000.www1.hp.com/support/files. Power Supply - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 182
the power supply, reverse the removal procedure. CAUTION: When installing the power supply cables, make sure they are properly positioned so they are not cut by the drive cage and are not pinched by the rotating power supply. 170 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 183
drive cage to its upright position. 7. Rotate the power supply to its full upright position. 8. Disconnect all data and power cables from the system board. 9. If applicable, disconnect the serial port : When replacing the system board, you must also change the chassis serial number in the BIOS. NOTE: - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 184
access panel (Computer Access Panel on page 125). 4. Rotate the drive cage to its upright position. 5. Remove the power supply (Power Supply on page the backwall To replace the backwall, reverse the removal procedures. 172 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 185
(Computer Access Panel on page 125). NOTE: It may be necessary to remove an expansion card to gain access to the battery. 3. Locate the battery and battery holder on the system board. 4. Depending on the type of battery holder on your system board, complete the following instructions to replace the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 186
positive side up (2). Push the other edge down until the clamp snaps over the other edge of the battery. Figure 8-69 Removing the battery from a type 2 holder 3. Replace the computer access panel. 174 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 187
(2). 2. Insert the new battery and position the clip back in place. Figure 8-70 Removing the battery from a type 3 holder 3. Replace the computer access panel. 4. Plug in the computer and turn on power to the computer. 5. Reset the date and time, your passwords, and any special system setups, using - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 188
Using the Small Form Factor Computer in a Tower Orientation The Small Form Factor computer can be used in a tower orientation. The HP logo plate on the front bezel is adjustable for either desktop or tower orientation. 1. Prepare the computer for disassembly (Preparation for Disassembly on page 118 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 189
then turn on the computer. 10. Lock any security devices that were disengaged when the access panel was removed. NOTE: Ensure at least 10.2 centimeters (4 inches) of space on all sides of the computer remains clear and free of obstructions. Using the Small Form Factor Computer in a Tower Orientation - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 190
screws used in the computer are of different thread sizes and lengths; using the wrong screw in an application may damage the unit. 8. If the PC is mounted in the accessory mounting stand, remove it from the stand. 178 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 191
object. Installing a Security Lock Cable Lock There are two cable lock slots on the rear of the computer. The slot next to the thumbscrew should be used when there is no port cover. The slot on the far right should be used when a port cover is installed. Figure 9-1 Installing a Cable Lock with No - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 192
Padlock Figure 9-3 Installing a Padlock HP Business PC Security Lock 1. Fasten the security cable by looping it around a stationary object. Figure 9-4 Securing the Cable to a Fixed Object 180 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 193
2. Thread the keyboard and mouse cables through the lock. Figure 9-5 Threading the Keyboard and Mouse Cables 3. Screw the lock to the chassis using the screw provided. Figure 9-6 Attaching the Lock to the Chassis External Security Devices 181 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 194
4. Insert the plug end of the security cable into the lock (1) and push the button in (2) to engage the lock. Use the key provided to disengage the lock. Figure 9-7 Engaging the Lock 182 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 195
disassembly (Preparation for Disassembly on page 178). 2. Loosen the thumbscrew on the rear of the computer (1), slide the access panel toward the front of the computer, and then lift it off (2). Figure 9-8 Removing the Computer Access Panel To install the access panel, reverse the removal procedure - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 196
towards the right side of the computer (1) and rotate the bezel off from right to left (2). Figure 9-10 Removing the Front Bezel 5. Replace the fan shroud. To install the front bezel, reverse the removal procedure. 184 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 197
Bezel Blank On some models, there is a bezel blank covering the external drive bay that needs to be removed before installing a drive. To remove a bezel blank: 1. Remove the computer access panel (Front Bezel on page 184). 2. Push the two retaining tabs that hold the bezel blank in place towards the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 198
supported NOTE: The system will not operate properly if you install unsupported SODIMMs. Refer to the Computer Setup (F10) Utility Guide for information on how to determine the processor bus frequency of a specific computer. 186 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 199
socket, Channel B White NOTE: A SODIMM must occupy the black DIMM1 socket. Otherwise, the system will display a POST error message indicating that a memory module must be installed in the black socket. The system will automatically operate in single channel mode, dual channel mode, or flex mode - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 200
power cord before adding or removing memory modules. Regardless of the power-on state, voltage is always supplied to the memory modules as long as the computer is plugged into an active AC outlet. Adding or removing memory Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 201
with the tab on the memory socket. A SODIMM must occupy the DIMM1 (top) socket. 6. Replace the SODIMM in the DIMM1 socket if it was removed. 7. Replace the access panel. 8. If the computer was on a stand, replace the stand. 9. Reconnect the power cord and turn on the computer. 10. Lock any security - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 202
computer. ● Keep cables away from major heat sources like the heatsink. ● Do not jam cables on top of expansion cards or memory in a failed power supply. Figure 9-15 Removing a power supply cable from its connector 190 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 203
Cable Connections System board connectors are color-coded to make it easier to find the proper connection. System power Optical power Replacing the Optical Drive The Ultra-Slim Desktop uses a slimline Serial ATA (SATA) optical drive. Removing the Existing Optical Drive 1. Prepare the computer for - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 204
the release latch, and press firmly. 4. Insert the second pin, and press the entire release latch firmly to fasten the latch securely to the optical drive. Figure 9-17 Aligning the Release Latch 192 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 205
for Disassembly on page 178). 2. Remove the computer access panel (Computer Access Panel on page 183). 3. Remove the optical drive (Removing the Existing Optical Drive on page 191). 4. Push the top of the connector down through the opening of the hard drive cage until the connector is on the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 206
5. Pull the connector straight up to disconnect it from the system board. Figure 9-19 Removing the optical drive connector To install the optical drive connector, reverse the removal procedures. 194 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 207
: The Ultra-Slim Desktop supports only 2.5-inch Serial ATA (SATA) internal hard drives; parallel ATA (PATA) internal hard drives are not supported. Before you remove the old hard drive, be sure to back up the data from the old hard drive so that you can transfer the data to the new hard drive. Also - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 208
of the chassis. Figure 9-21 Removing the Hard Drive Carrier 6. To remove the hard drive from the carrier, remove the guide screw from the front left side of the carrier. Figure 9-22 Removing the Hard Drive Guide Screw 196 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 209
7. Slide the carrier back and remove the hard drive. Figure 9-23 Removing the Hard Drive 8. Transfer the three remaining guide screws (two on the right and one on the rear left) from the old drive to the new drive. Figure 9-24 Transferring the Guide Screws Hard Drive 197 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 210
down (2) so that the drive is properly seated and locked in place. Figure 9-26 Installing the Hard Drive Carrier 11. Lock any security devices that were disengaged when the computer cover or access panel was removed. 198 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 211
automatically recognizes it the next time you turn on the computer. After replacing the hard drive, use the Recovery Disc Set that you created when you initially set up the computer to restore the operating system, software drivers, and any software applications that were preinstalled on the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 212
is secured in place by a retention lever just inside the port cover opening. To remove the port cover, pull the lever back towards the port cover opening (1), then slide the cover to the left and off the computer (2). 200 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 213
Figure 9-29 Removing a Port Cover Front Fan 1. Prepare the computer for disassembly (Preparation for Disassembly on page 178). 2. Remove the computer access panel (Computer Access Panel on page 183). 3. Disconnect the fan control cable from the system board. 4. Lift the fan straight up and out of - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 214
speaker up to remove it from the chassis. Figure 9-31 Removing the speaker To install the speaker, reverse the removal procedure. 202 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 215
for disassembly (Preparation for Disassembly on page 178). 2. Remove the computer access panel (Computer Access Panel on page 183). 3. Disconnect the fan control cable from the system board. 4. Remove the four screws that secure the fan to the chassis (1), - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 216
2. Remove the computer access panel (Computer Access Panel on page 183). 3. Remove the front fan (Front Fan on page 201). 4. Lift the fan up and place it on top of the optical drive to access the to the system board. 204 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 217
on the socket are very fragile and any damage to them may require replacing the system board. Processor 1. Prepare the computer for disassembly (Preparation for Disassembly on page 178). 2. Remove the computer access panel (Computer Access Panel on page 183). 3. Remove the heatsink (Heatsink on page - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 218
the system board, always update the system ROM to ensure that the latest version of the BIOS is being used on the computer. The latest system BIOS can be found on the Web at: http://h18000.www1.hp.com/support/files. System Board CAUTION: Be very careful when removing or replacing the system board to - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 219
until it clears the chassis, and then remove the system board from the chassis. To install the system board, reverse the removal procedure. NOTE: When replacing the system board, you must also change the chassis serial number in the BIOS. System Board 207 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 220
coin cell battery. NOTE: The lifetime of the lithium battery can be extended by plugging the computer into a live AC wall socket. The lithium battery is only used when the computer is NOT connected to AC power. 208 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 221
to http://www.hp.com/ recycle. CAUTION: Static electricity can damage the electronic components of the computer or optional equipment 5. After the battery has been replaced, reverse the disassembly procedure. 6. Plug in the computer and turn on power to the computer. 7. Reset the date and time, your - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 222
the logo plate from the bezel (1). 5. Rotate the plate 90 degrees (2) then press the logo plate back into the bezel. Figure 9-39 Rotating the HP Logo Plate 6. Replace the front bezel. 7. Replace the access panel. 210 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 223
Reconnect the external equipment, plug the power cord into a power outlet, and turn the computer on. 10. Lock any security devices that were disengaged when the computer cover or access panel was removed. To change from the tower configuration to the desktop configuration, reverse the previous steps - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 224
A Connector Pin Assignments This appendix contains the pin assignments for many computer and workstation connectors. Some of these connectors may not be used on the product being serviced. Keyboard Connector and Icon Pin Signal 1 Data 2 Unused 3 Ground 4 +5 VDC 5 Clock 6 Unused - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 225
RJ-45 Connector and Icon Ethernet AUI Connector and Icon Pin Signal 1 Ground 2 Negative AUI Differential Collision 3 Positive AUI Differential Collision 4 AUI Differential Receive 10 +12V 11 Ground 12 Ground 13 Unused 14 Unused 15 Unused 16 Unused Ethernet RJ-45 213 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 226
Data Bit 5 8 Data Bit 6 9 Data Bit 7 Pin Signal 10 Acknowledge 11 Busy 12 Paper End 13 Select 14 Auto Linefeed 15 Error 16 Initialize Printer 17 Select IN 18-25 Signal Ground Serial Interface, Powered and Non-Powered Connector and Icon Pin Signal 1 Carrier Detect (12V if - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 227
USB Connector and Icon Microphone Connector and Icon (1/8" miniphone) 1 23 Headphone Connector and Icon (1/8" miniphone) 1 23 Line-in Audio Connector and Icon (1/8" miniphone) 1 23 Line-out Audio Connector and Icon (1/8" miniphone) 1 23 Pin Signal 1 +5 VDC 2 - Data 3 + Data 4 Ground Pin 1 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 228
Pin Signal 1 Red Analog 2 Green Analog 3 Blue Analog 4 Not used 5 Ground 6 Ground 7 Ground 8 Ground Pin Signal 9 +5V (fused) 10 Ground 11 Not used 12 DDC Serial Data 13 Horizontal Sync 14 Vertical Sync 15 DDC - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 229
ATA/ATAPI (IDE) Standard Drive Cable Connector Pin Signal 1 Reset 2 Ground 3 DD7 4 DD8 5 DD6 6 DD9 7 DD5 8 DD10 9 DD4 10 DD11 11 DD3 12 DD12 13 DD2 14 cable detect) 35 DA0 36 DA2 37 CS1FX 38 CS3FX 39 DASP 40 Ground ATA/ATAPI (IDE) Standard Drive Cable 217 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 230
CD-ROM 50-Pin Connector Connector Pin Signal 1 Audio L-ch 2 Audio R-ch 3 Audio GND 4 GND 5 RESET 6 DD8 7 DD7 8 DD9 9 DD6 10 DD10 11 DD5 12 DD11 13 DD4 24-Pin Power Connector 24 12 Pin Signal 1 +3.3V 2 +3.3V 3 GND 4 +5V 5 GND 6 +5V Pin Signal 14 DD12 15 DD3 16 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 231
3V Pin Signal 19 GND 20 +3.3V 21 Sense 22 +3.3V 23 +3.3V 24 GND 4-Pin Power (for CPU) Connector and Icon Pin Signal 1 GND 2 GND 3 +12V CPU 4 -12V CPU 6-Pin Power (for CPU) (CMT, SFF) Connector and Icon 4 6 Pin Signal 1 GND 2 GND 3 GND 4 12V CPU 5 12V CPU 6 +12V 24-Pin - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 232
SATA Data and Power Drive Connector Pin Signal S1 Ground S5 BP1 Ground P5 BP9 V 5 P13 V 12 S = Data, P = Power Pin Signal S2 A+ S6 B+ P2 V 3.3 P6 Ground P10 Ground P14 V12 PCI Express x1, x4, x8, and x16 PCI Express Connector Pin Signal S3 AS7 Ground P3 V 3.3 P7 V 5 P11 Reserved P15 V 12 Pin - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 233
PERp15 NOTE: x1 PCI Express uses pins 1-18 x4 PCI Express uses pins 1-32 x8 PCI Express uses pins 1-49 x16 PCI Express uses pins 1-8 62 GND 63 GND 64 PERp11 65 PERn11 PCI Express x1, x4, x8, and x16 PCI Express Connector 67 46 PETn7 47 GND 48 PRSNT2# 49 GND 50 PETp8 71 PETn13 PCI Express 221 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 234
82 RSVD 78 PETp15 79 PETn15 80 GND NOTE: x1 PCI Express uses pins 1-18 x4 PCI Express uses pins 1-32 x8 PCI Express uses pins 1-49 x16 PCI Express uses pins 1-8 62 PETp11 63 PETn11 64 GND 65 GND PCI Express Mini Card PCI Express Mini Card Connector 67 PETn12 68 GND 69 GND 70 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 235
36 USB_D- 42 LED_WWAN# 48 +1.5V NOTE: *Reserved for future second PCI Express LAN (if needed) **Reserved for future wireless coexistence control interface ( /3 Shield 12 T.M.D.S. Data3- Pin Signal 13 T.M.D.S. Data3+ 14 +5V Power 15 Ground (for +5V) 16 Hot Pug Detect 17 T.M.D.S. Data0- - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 236
B Power Cord Set Requirements The power supplies on some computers have external power switches. The voltage select switch feature on the computer permits it to operate from any line voltage between 100-120 or 220-240 volts AC. Power supplies on those computers that do not have external power - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 237
Finland (1) SETI United Kingdom (1) BSI France (1) UTE United States (2) UL Germany (1) VDE 1. The flexible cord must be Type HO5VV-F, 3-conductor, 0.75mm2 conductor size. Power cord set fittings (appliance coupler and wall plug) must bear the certification mark of the agency responsible - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 238
C POST Error Messages This appendix lists the error codes, error messages, and the various indicator light and audible sequences that you may encounter during Power-On Self-Test (POST) or computer restart, the probable source of the problem, and steps you can take to resolve the error condition. - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 239
time or date in configuration memory. RTC (real-time clock) battery may need to be replaced. Reset the date and time under Control Panel (Computer Setup can also be used). If the problem persists, replace the RTC battery. See the Hardware Reference Guide for instructions on installing a new battery - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 240
3. If third-party memory has been added, test using HP-only memory. 4. Verify proper memory module type. 201-Memory Error RAM failure. 1. Ensure memory modules are correctly installed. 2. Verify proper memory module type. 3. Remove and replace the identified faulty memory module(s). 4. If the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 241
2. Clear CMOS. 3. Replace diskette drive. 4. Replace the system board. 605-Diskette Drive Type Error Mismatch in drive type. 1. Disconnect any other diskette controller devices (tape drives). 2. Clear CMOS. 660-Display cache is detected unreliable Integrated graphics controller display cache - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 242
is giving correct error message. Enter Computer Setup and run the Drive Protection System test under Storage > DPS Self-test. 2. Apply hard drive firmware patch if applicable. (Available at http://www.hp.com/support.) 3. Back up contents and replace hard drive. 1796-SATA Cabling Error One or - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 243
the power cord, restore the original memory configuration, and reboot the computer. 4. If the error persists, replace the system board. 2204-Inventory error during MEBx execution BIOS information passed to the MEBx resulted in a failure. 1. Reboot the computer. 2. If the error persists, update to - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 244
MEBx operation experienced a hardware error during communication with ME. 1. Reboot the computer. 2. If the error persists, update to the latest BIOS version. 3. If the error still persists, replace the system board. 2211-Memory not configured correctly for proper MEBx execution. DIMM1 is not - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 245
fifth iteration but LEDs continue until problem is solved. Red Power LED flashes three 3 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Computer on. None Computer in Suspend to RAM mode (some models only) or - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 246
system will power up. Replace the power supply adapter with the HP-supplied USDT power supply adapter. Red Power LED flashes five 5 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Pre-video memory error. CAUTION - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 247
Mode" section of the Desktop Management Guide for more information. 2. Replace the system board. Red Power LED flashes nine 9 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. System powers on but is unable to - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 248
Front Panel LEDs and Audible Codes (continued) Activity Beeps Possible Cause Recommended Action 4. Check to see if the 5V_aux light on the system board is turned on. If it is turned on, then replace the power button harness. If the problem persists, replace the system board. 5. If the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 249
to try to isolate the exact problem before calling for technical support. ● Run the HP diagnostic tool. ● Run the hard drive self-test in Computer Setup. Refer to the Computer Setup (F10) Utility Guide for more information. ● Check the Power LED on the front of the computer to see if it is flashing - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 250
call is handled properly: ● Be in front of your computer when you call. ● Write down the computer serial number, product ID number, and monitor serial number before calling. ● Spend time troubleshooting the problem with the service technician. ● Remove any hardware that was recently added to your - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 251
not restart, press the power button to start the computer. ● Reconfigure the computer after installing a non-plug and play expansion board or other option. See Solving Hardware Installation Problems on page 259 for instructions. ● Be sure that all the needed device drivers have been installed. For - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 252
prolongs the life of the RTC battery. First, reset the date and time under Control Panel (Computer Setup can also be used to update the RTC date and time). If the problem persists, replace the RTC battery. See the Hardware Reference Guide for instructions on installing a new battery, or contact an - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 253
HP. You will need the FailSafe Key in case of forgotten password, power loss, or computer malfunction. Order PN 166527-001 for the wrenchstyle key or PN 166527-002 for the screwdriver bit key. Poor performance is experienced. Cause Processor is hot. Hard drive is full. Low on memory. Hard drive - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 254
replace the heatsink/fan assembly. 4. Contact an authorized reseller or service provider. System does not power on and the LEDs on the front of the computer are not flashing. Cause Solution System unable to power on. Press and hold the power button for less than 4 seconds. If the hard drive - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 255
on because of internal power supply Contact an authorized service provider to replace the power fault. supply. Computer powered off automatically and the Power LED flashes Red two times, once every second, followed by a two second pause, and the computer beeps two times. (Beeps stop after fifth - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 256
before the system will power up. Replace the power supply adapter with the HP-supplied USDT power supply adapter. Solving Diskette Problems Common causes and solutions for diskette problems are listed in the following table. NOTE: You may need to reconfigure the computer when you add or - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 257
Table D-3 Solving Diskette Problems (continued) Drive not found. Cause Cable is loose. Removable drive is not seated properly. The device has been hidden in Computer Setup. Solution Reseat diskette drive data and power cable. Reseat the drive. Run the Computer Setup utility and ensure Device - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 258
type. Check the drive letter in the path statement. Replace the diskette with a new one. "Invalid system disk" message is displayed. Cause Solution A diskette that does not contain the system files needed to start When drive activity stops, remove the diskette and press the the computer - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 259
listed, the probable cause is a driver problem. If it is not listed, the probable cause is a hardware problem. If this is a newly installed drive, run the Computer Setup utility and try adding a POST delay under Advanced > Power-On. The device is attached to a SATA port that has been hidden in Run - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 260
Order. Hard Drive's "Emulation Type" is set to "None." Hard drive is damaged. Run the Computer Setup utility and change the "Emulation Type" to "Hard Disk" in the device's details under Storage > Device Configuration. Observe if the front panel Power LED is blinking RED and if any beeps are heard - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 261
. The removable hard drive enclosure is beeping and the green LED is flashing. Cause Solution Fan failure alarm on the removable hard drive enclosure has Shut down the computer and contact HP for a replacement been activated. enclosure. Solving Media Card Reader Problems Table D-5 Solving - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 262
few seconds so that the operating system can recognize reader was just installed into the computer and you are turning the reader and the available ports, and then recognize the PC on for the first time. whatever media is inserted in the reader. 250 Appendix D Troubleshooting Without Diagnostics - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 263
and, if set, type your password. System ROM is corrupted; system is running in Boot Block Emergency Recovery Mode (indicated by eight beeps). Reflash the system ROM with the latest BIOS image. See the "Boot Block Emergency Recovery Mode" section of the Desktop Management Guide for more information - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 264
-party memory with HP memory. 4. Replace the system board. Blank screen and the power LED flashes Red six times, once every second, followed by a two second pause, and the computer beeps six times. (Beeps stop after fifth iteration but LEDs continue flashing.) Cause Solution Pre-video graphics - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 265
of the image. "No Connection, Check Signal Cable" displays on screen. Cause Solution Monitor video cable is disconnected. Connect the video cable between the monitor and computer. CAUTION: Ensure that the computer power is off while connecting the video cable. Solving Display Problems 253 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 266
select the appropriate monitor, and download either SP32347 or SP32202: http://www.hp.com/support Graphics card is not seated properly or is bad. 1. Reseat the graphics card. 2. Replace the graphics card. Certain typed symbols do not appear correct. Cause Solution The font you are using does - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 267
Table D-6 Solving Display Problems (continued) Certain typed symbols do not appear correct. Cause Solution Tools > Character Map. You can copy the symbol from the Character Map into a document. Solving Audio Problems If the computer has audio features and you encounter audio problems, see the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 268
the headphone connector on the The rear audio output connector is for powered audio devices front of the computer. and is not designed for headphone use. Computer appears to be locked up while recording audio. Cause Solution The hard disk may be full. Before recording, make sure there is enough - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 269
for the application is not installed. The cables may not be connected properly. Printer memory may be overloaded. Solution Install the correct printer driver for the application. Reconnect all cables. Reset the printer by turning it off for one minute, then turn it back on. Printer is offline - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 270
Problems Keyboard commands and typing are not recognized by the computer. Cause Solution Keyboard connector is not properly connected. 1. On the Windows XP Desktop standby mode, do not hold down the power button for more than four seconds. Otherwise, the computer will shut down and you will lose - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 271
computer stores. Solving Hardware Installation Problems You may need to reconfigure the computer when you add or remove hardware, such as an additional drive Wizard and follow the instructions that appear on the screen. WARNING! When the computer is plugged into an AC power source, voltage is - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 272
correct memory modules and to verify the proper installation. NOTE: DIMM 1 must always be installed. 2. Observe the beeps and LED lights on the front of the computer. Beeps and flashing LEDs are codes for specific problems. 3. If you still cannot resolve the issue, contact Customer Support. Power - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 273
Hardware Installation Problems (continued) Power LED flashes Red six times, once every second, followed by a two second pause, and the computer beeps six times. (Beeps stop after fifth iteration but LEDs continue flashing.) Cause Solution For systems with integrated graphics, replace the system - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 274
Problems (continued) Wake-on-LAN feature is not functioning. Cause Solution 6. Click the Configure button. 7. Click the Power Management tab, then select the check box to Allow this device to wake the computer. Network driver the correct connector. There is a problem with the cable or a device - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 275
the Computer Setup Advanced menu, change the resource settings for the board. Network controller stops working without apparent cause. Cause Solution The files containing the network drivers are corrupted. Reinstall the network drivers, using the Recovery Disc Set created from the hard drive - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 276
Unprogrammed EEPROM. Solution Contact an authorized service provider. Solving Memory Problems If you encounter memory problems, some common causes and solutions are listed in the following table. CAUTION: Power may still be supplied to the DIMMs when the computer is turned off (depending on the - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 277
computer beeps five times. (Beeps stop after fifth iteration but LEDs continue flashing.) Cause Solution Memory is installed incorrectly or is bad. 1. Reseat DIMMs. Power on the system. 2. Replace DIMMs one at a time to isolate the faulty module. 3. Replace third-party memory with HP memory - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 278
, the probable cause is a driver problem. If it is not listed, the probable cause is a hardware problem. If this is a newly installed drive, run the Computer Setup utility and try adding a POST delay under Advanced > Power-On Options. The device is attached to a SATA port that has been hidden in - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 279
came with the DVD drive. Install decoder software. Replace media. Use DVD drive. 1. Use Device Manager to remove or uninstall the device. 2. Restart the computer and let Windows detect the CD or DVD driver. Recording or copying CDs is difficult or impossible. Cause Wrong or poor quality media type - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 280
Device: Supported USB Flash Media Device" section of the Service Reference Guide. The computer boots to DOS after making a bootable flash drive. Cause Solution Flash drive is bootable. Install the flash drive only after the operating system boots. 268 Appendix D Troubleshooting Without - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 281
Restart the computer. 1. Replace the device. 2. Restart the computer. USB ports on the computer are disabled in Computer Setup. Enter Computer Setup (F10) and enable the USB ports. Solving Internet Access Problems If you encounter Internet access problems, consult your Internet Service Provider - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 282
Problems (continued) Unable to connect to the Internet. Cause Solution IP address is not configured properly. Contact your ISP for the correct IP address. Cookies are corrupted. (A "cookie" is a small Double-click Modems. 6. Double-click Agere Systems PCI-SV92PP Soft Modem. 7. On the General tab - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 283
possible causes. See the Restore Kit or the Worldwide Limited Warranty for terms and conditions. Computer will not continue after HP logo screen has appeared. Cause Solution System files may be damaged. Use recovery diskette to scan hard drive for errors. Solving Software Problems 271 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 284
computer to an authorized reseller, dealer, or service provider for service, remember to provide the setup and power-on passwords if they are set. Refer to the number listed in the warranty or in the Support Telephone Numbers guide for technical assistance. 272 Appendix D Troubleshooting Without - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 285
are used on most but not all HP system and riser boards. Designator BAT Battery socket/Battery LED - 5V_Aux or VIN Health-LED UID LED Power LED Boot block header/jumper Boot block recovery header ROM recovery PCI slots PCI extender slot (male) PCI Express X1 slots PCI Express x16 graphics slot 273 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 286
parallel port Second parallel port Double-stacked parallel port, Top = Port B, Bottom = Port A Parallel port over single Serial Port Parallel port over Serial Port and Video Port Parallel port over dual VGA ports Display port connector DVI connector Keyboard connector, PS/2 (Closest to power supply - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 287
CPU heatsink fan P9 Secondary chassis fan header P10 Diskette drive connector P11 Power supply or rear chassis fan header P12 Alert on LAN connector PCI extender slot (female) P40 Blade PC graphics connector (outboard) P41 Blade PC graphics connector (inboard) P52 Second serial port - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 288
serial port Double stack serial port, Top = Serial B, Bottom = Serial A Riser edge connector (male-mates with J30) Primary Serial ATA (SATA) connector Second Serial ATA (SATA) connector Third Serial ATA (SATA) connector Fourth Serial ATA (SATA) connector VSFF expansion connector Graphics option - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 289
Parallel port diode array First serial port transceiver Second serial port transceiver TPM controller VRD controller USB front port power switch First USB rear port power switch Second USB rear port power switch Third USB rear port power switch Battery socket Memory slot Following memory slots - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 290
Y1 Y2 Y3 Y4 Y5/H5 Y6 L1-5 Primary (TH) system clock crystal Secondary (SMT) system clock crystal Primary NIC clock crystal Secondary NIC clock crystal RTC clock crystal/tie-down SATA-to-PATA crystal USB chokes 278 Appendix E System Board and Riser Board Reference Designators - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 291
CMT Specifications Table F-1 Specifications Desktop Dimensions Height 7.0 in 17.8 cm Width 17.63 in 44.8 cm Depth 17.8 in 45.2 cm Tower Dimensions Height 17.63 in 44.8 cm Width 7.0 in 17.8 cm Depth 17.8 in 45.2 cm Approximate Weight 26.4 lb 12.0 kg Weight Supported - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 292
in the countries of the European Union. The active power factor corrected power supply also has the added benefit of not requiring an input voltage range select switch. SFF Specifications Table F-2 Specifications Desktop Dimensions (in the desktop position) Height Width Depth 3.95 in 13.3 in 14 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 293
in the countries of the European Union. The active power factor corrected power supply also has the added benefit of not requiring an input voltage range select switch. USDT Specifications Table F-3 Specifications Desktop Dimensions (in the desktop position) Height Width Depth 2.60 in 9.90 in 10 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 294
@ 100VAC 1.1A @ 200VAC 1 This system utilizes an active power factor corrected external power supply. This allows the system to pass the CE mark requirements for use in the countries of the European Union. The active power factor corrected power supply also has the added benefit of not requiring an - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 295
ATA/ATAPI (IDE) drive cable pin assignments 217 audible codes 233 audio problems 255 B Backup and Recovery Manager 29 backwall, SFF removal and replacement 172 battery CMT removal and replacement 110 disposal 62 SFF removal and replacement 173 USDT removal and replacement 208 beep codes 233 bezel - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 296
power cord set requirements 225 cover lock 48 Customer Support 237, 272 D deleting password 45 delimiter characters, table 45 deployment tools, software 23 desktop conversion 113 diagnostic tool for hard drives 49 diagnostics utility 17 DIMMs. See memory disassembly preparation CMT 63 SFF 118 USDT - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 297
guide screws 140 hard drive 93, 152, 195 media card reader 91, 150 memory 75, 77, 128 memory module 186, 188 optical drive 91, 144, 193 port cover 200 removable hard drive 95, 156 SODIMMs 186, 188 internal components, accessing 183 internal temperature of computer 50 Internet access problems 269 - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 298
Card Reader 249 memory 264 monitor 251 mouse 258 network 261 power 243 printer 256 processor 265 software 271 processor CMT removal and replacement 106 SFF removal and replacement 168 USDT removal and replacement 205 processor problems 265 protecting hard drive 49 ProtectTools Security Manager - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 299
computer 279, 280, 281 memory 75, 128 SODIMMs 186 static electricity 56 Subscriber's Choice 32 surge-tolerant power supply 49 system board CMT removal and replacement 109 reference designators 273 SATA connectors 51 SFF removal and replacement 171 USDT removal and replacement 206 system board drive - Compaq dc7900 | Service Reference Guide: HP Compaq dc7900 Business PC - Page 300
29 BIOS download 33 Configuration Management 24 HP Business PC Security 27 HP Client Automation Center 28 HP Client Catalog for Microsoft SMS 29 HP Client Management Interface 26 HP Client Management Solutions 24 HP Client Manager from Symantec 29 HP Softpaq Download Manager 26 HP Support 30 HP
Service Reference Guide
HP Compaq dc7900 Business PC