Compaq dc7800 Service Reference Guide - HP Compaq dc7800 Business PC
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- Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 1
Service Reference Guide HP Compaq dc7800 Business PC - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 2
Microsoft and Windows are trademarks of Microsoft Corporation in the U.S. and other countries. The only warranties for HP products and services are set written consent of Hewlett-Packard Company. Service Reference Guide Business PCs First Edition (September 2007) Document Part Number: 459784-001 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 4
iv About This Book - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 5
System ...1 Installing or Upgrading Device Drivers 1 HP Backup and Recovery HP Insight Diagnostics 19 Downloading the Latest Version of HP Insight Diagnostics 19 Protecting the Software ...19 HP Backup and Recovery Manager 20 4 Desktop Management Initial Configuration and Deployment 21 HP - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 6
34 Creating a Bootable Device 35 Supported USB Flash Media Device 35 Unsupported USB Flash Media Device 36 Dual-State Power Button ...37 HP Web Site Support ...38 Industry Standards ...38 and Recovery 47 Drive Protection System ...47 Surge-Tolerant Power Supply 47 Thermal Sensor ...47 vi - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 7
SATA Power Cable ...49 PATA Device Information ...50 ATA SMART Drives ...50 Hard Drive Capacities ...50 6 Identifying the Chassis, Routine Care, and Disassembly Preparation Chassis Designations ...51 Convertible Minitower (CMT 51 Small Form Factor (SFF 52 Ultra-Slim Desktop (USDT 52 Electrostatic - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 8
2 Battery Holder ...101 Type 3 Battery Holder ...102 Changing from a Desktop to a Minitower Configuration 103 Changing from a Minitower to a Desktop Configuration 105 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis Preparation for Disassembly ...107 Unlocking the Smart Cover - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 9
9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis Preparation for Disassembly ...159 External Security Devices ...160 Cable Lock ...160 HP Business PC Security Lock 161 Computer Access Panel ...163 Front Bezel ...164 Bezel Blanks ...165 Memory ...166 SODIMMs ...166 DDR2-SDRAM - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 10
Audio ...194 External Infrared Transceiver ...195 Monitor ...195 ATA/ATAPI (IDE) Standard Drive Cable 196 CD-ROM 50-Pin Connector ...197 24-Pin Power ...197 24-Pin MicroFit Power (CMT, SFF 198 4-Pin Power (for CPU) ...198 6-Pin Power (for CPU) (CMT, SFF 198 SATA Data and Power ...199 PCI Express - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 11
Audio Problems ...233 Solving Printer Problems ...235 Solving Keyboard and Mouse Problems 236 Solving Hardware Installation Problems 237 Solving Network Problems ...239 Solving Memory Problems ...242 Solving Processor Problems ...244 Solving CD-ROM and DVD Problems 244 Solving Drive Key Problems - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 12
xii - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 13
This action points the operating system to the appropriate drivers. Obtain the latest support software , including support software for the operating system from http://www.hp.com/support. Select your country and language, select Download drivers and software, enter the model number of the computer - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 15
settings for processor, graphics, memory, audio, storage, communications, power-on. ● Establish a setup password that controls access to Computer Setup (F10) Utility and the settings described in this section. ● Secure integrated I/O functionality, including the serial, USB, or parallel ports, audio - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 16
(some models), select Apply Defaults and Exit. This option will restore the original factory system defaults. CAUTION: Do NOT turn the computer power OFF while the BIOS is saving the Computer Setup (F10) changes because the CMOS could become corrupted. It is safe to turn off the computer only after - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 17
name and version) ● Chassis serial number ● Asset tracking number ● ME firmware version ● ME management mode About Displays copyright notice. Set Time and Date Allows you to set system time and date. Flash System ROM Allows you to update the system ROM with a BIOS image file located on a USB - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 18
Support for specific Computer Setup options may vary depending on the hardware configuration. Table 2-3 Computer Setup-Storage Option Description Device Configuration Lists all installed BIOS by the BIOS should not be changed. If the selected translation mode is not compatible with the - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 19
by the BIOS to translate disk manually. SATA Emulation Allows you to choose how the SATA controller and devices are accessed by the operating system. There are two supported Windows 2000, XP, or Vista with the appropriate RAID device driver. NOTE: The RAID device driver available on USDT systems. - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 20
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 ● All USB ports ● Front USB ports ● System audio ● Network controllers (some models - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 21
SATA5 (some models) Network Service Boot Enables/disables the computer's Desktop Management Guide for more information. ● Chassis serial number or Universal Unique Identifier (UUID) number. The UUID can only be updated if the current chassis serial and chipset features needed to support a virtual - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 22
VA 3.0 configuration interfaces. Smart Card BIOS Password Support (some models) (enable/disable) Allows the user to enable/ disable the Smart Card to be used in place of the Setup and Power-On Passwords. This setting requires additional initialization within HP - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 23
feature is disabled, S4 and S5 both have the LED off. S1 (no longer supported) and S3 use 1 blink per second. Hardware Power Management SATA power management enables or disables SATA bus and/or device power management. Thermal Fan idle mode-This bar graph controls the minimum permitted fan speed - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 24
still accesses the ME BIOS Extension Setup Utility, which HP Backup and Recovery partition. See Factory Recovery Boot Support powered off when power is restored. ◦ On-causes the computer to power on automatically as soon as power is restored. ◦ On-allows you to power on the computer using a rack power - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 25
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 26
Integrated Video. When PCI Express video is on, Integrated Video must remain disabled. ● Multi-Processor (enable/disable). This option may be used to disable multi-processor support under the OS. ● Internal speaker (some models) (enable/disable) ● Monitor Tracking (enable/disable). Allows BIOS to - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 27
Select Create a set of recovery discs (Recommended) 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 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 28
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 29
of the current set of tests. While testing is in progress, a Cancel Testing button is displayed for use if you want to cancel the test. HP Insight Diagnostics 17 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 30
in the Help tab. The Clear Error Log button will clear the contents of the Error Log. Help Tab On the Help tab contains an HP Insight Diagnostics tab, an Error Codes tab, and a Test Components tab. The HP Insight Diagnostics tab contains help topics and includes search and index features. The Error - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 31
diskette or USB 2.0 HP Drive Key (capacity must be 64MB or higher). USB 1.0 Drive Keys are not supported. 2. Click Save Downloading the Latest Version of HP Insight Diagnostics 1. Go to http://www.hp.com. 2. Click the Software & Driver Downloads link. 3. Enter your product number (for example, dc7800 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 32
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 33
of desktop management are: ● Initial configuration and deployment ● Remote system installation ● Software updating and management ● ROM flash ● Hardware option configuration ● Asset tracking and security ● Fault notification and recovery NOTE: Support for specific features described in this guide - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 34
system software, configuration management and troubleshooting, and power management. NOTE: See HP Backup and Recovery Manager on page 2 for information on creating the Restore Plus! CD. HP OpenView Agent NOTE: HP OpenView Agent is not currently available for Windows Vista. The management agent used - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 35
Installation, press F12 when the F12 = Network Service Boot message appears in the lower-right corner of the HP logo screen when the 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 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 36
(WBEM), System Management BIOS (SMBIOS), and Advanced Configuration and Power Interface (ACPI). HP CMI is a foundation technology utilized in HP Client Management Solutions. With HP CMI, HP gives you flexibility in choosing how you manage your HP client computers. 24 Chapter 4 Desktop Management - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 37
of HP client systems. Use HP Client Manager to: ● Get valuable hardware information such as CPU, memory, video, and security settings ● Monitor system health to fix problems before they occur ● Automatically acquire and install drivers and BIOS updates without visiting each PC Software Updating and - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 38
● 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, notebook, and workstation models ● System Health - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 39
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 Basic Edition also supports deployment and management - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 40
productivity for the managed organization. HP now offers a mechanism to streamline updates for HP systems within a Microsoft System Management Server management infrastructure. The HP Client Catalog for SMS contains software driver and patch information for desktop, mobile and workstation platforms - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 41
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 dc7800 | Service Reference Guide - HP Compaq dc7800 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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 43
the 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. ROM Flash 31 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 44
or System Software Manager at http://www.hp.com/go/ssm/. HPQFlash The HPQFlash utility is used to locally update or restore the system BIOS of individual PCs from a Windows operating system. For more information on HPQFlash, visit http://www.hp.com/support/files and enter the model number of - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 45
power 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 supported USB flash media device, such as an HP Removable Media. Follow the instructions on the screen to - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 46
the configuration diskette or USB flash media device. 8. Download a BIOS utility for replicating setup (repset.exe) and copy it onto the configuration diskette or USB flash media device. To obtain this utility, go to http://welcome.hp.com/country/us/en/ support.html and enter the model number of the - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 47
Supported USB Flash Media Device Supported devices have a preinstalled image to simplify the process of making them bootable. All HP or Compaq a PC that is bootable from a USB flash media device CAUTION: Some older PCs may loss can occur. Check all USB ports for additional storage devices. If any - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 48
from Windows 9x, you may see a brief Windows logo PC that is bootable from a USB flash media device CAUTION: Some older PCs 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 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 49
: Only USDT models include power cord. Open the computer and reinstall any PCI cards that were previously removed. Close the computer cover. 13. Plug in the power Guide on the Documentation and Diagnostics CD for instructions. If you have used a DOS version from Windows 9x, you may see a brief Windows - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 50
, and installing the latest support software easier. You can download the software from http://www.hp.com/support. The Web site contains the latest device drivers, utilities, and flashable ROM images needed to run the latest Microsoft Windows operating system on the HP computer. Industry Standards - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 51
parallel, serial, or USB ports, or by disabling removable media boot capability, you can protect valuable data assets. Memory Change and instructions on using the Computer Setup Utilities. Some computers also have BIOS Configuration for HP ProtectTools, which is a Windows-based component of HP - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 52
feature is supported on some models only. See the HP ProtectTools Security Manager Guide at http://www.hp.com Device Security Enables/disables serial ports, parallel port, front USB ports, system audio, network controllers (some models), and SCSI controllers (some models). Network Service Boot - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 53
to the HP ProtectTools Security Manager Guide at http://www.hp.com. instructions on the screen. 4. Before exiting, click File > Save Changes and Exit. Entering a Power-On Password To enter a power-on password, complete the following steps: 1. Turn on or restart the computer. If you are in Windows - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 54
refer to the HP ProtectTools Security Manager Guide at http://www.hp.com. If 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 power-on password and setup - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 55
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 to the Troubleshooting Guide on the Documentation and Diagnostics CD for instructions on clearing passwords - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 56
POST will continue but the drive will remain inaccessible. On a warm boot or restart from Windows, if neither attempt succeeds, POST will halt and the user will be instructed to cycle power. DriveLock Applications The most practical use of the DriveLock security feature is in a corporate environment - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 57
see the Computer Setup (F10) Utility Guide on the Documentation and Diagnostics CD. 1. Turn on or restart the computer. If you are in Windows, click Start > Shut Down > Restart. 2. As soon a software-controllable cover lock featured on some HP computers. This lock prevents unauthorized access to - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 58
need the key in any of the following circumstances: ● Power outage ● Startup failure ● PC component failure (such as processor or power supply) ● Forgotten password CAUTION: The Smart Cover FailSafe Key is a specialized tool available from HP. Be prepared; order this key before you need oneat an - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 59
that caused you to run the DPS software. Refer to the Troubleshooting Guide on the Documentation and Diagnostics CD for instructions on using DPS. Surge-Tolerant Power Supply An integrated surge-tolerant power supply provides greater reliability when the computer is hit with an unpredictable - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 60
Parallel ATA Drive Guidelines and Features NOTE: Serial 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 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 61
SATA Hard Drive Cables SATA Data Cable Always use an HP approved 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 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 62
Microsoft are bytes to the base 2. File System FAT 32 NTFS Drive/Partition Capacity Limits Controller Type ATA ATA Operating System Windows 2000/XP/Vista Windows 2000/XP/Vista Maximum Size Partition 32 GB 2 TB Drive 2 TB 2 TB 50 Chapter 5 Serial and Parallel ATA Drive Guidelines and Features - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 63
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 64
Small Form Factor (SFF) Ultra-Slim Desktop (USDT) 52 Chapter 6 Identifying the Chassis, Routine Care, and Disassembly Preparation - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 65
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 66
straps/Boot straps can be used at standing workstations and are compatible with most types of shoes or boots. On conductive floors 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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 67
mats with hard tie to ground ● Field service kits ● Static awareness labels ● Wrist the keyboard feet down, directly against the front of the desktop unit as this also restricts airflow. ● Occasionally clean the ● Install or enable power management functions of the operating system or other - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 68
the keyboard body, follow the procedures described in Cleaning the Computer Case on page 56. When cleaning debris from under the keys, review all rules in General Cleaning Safety Precautions on page 56 before following these procedures: CAUTION: Use safety glasses equipped with side shields before - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 69
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 70
process, it can damage the unit. HP strongly recommends that all screws removed during being removed or replaced. CAUTION: When servicing this computer, ensure that cables are protective packaging until they are actually mounted in the CPU. ● Avoid dropping drives from any height onto any - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 71
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 system or return them to HP, their authorized partners, or their agents. Service Considerations 59 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 72
Convertible Minitower (CMT) Chassis Adherence to the procedures and precautions described in this chapter is essential for proper service it. CAUTION: Turn off the computer before disconnecting any cables. Regardless of the power-on state, voltage is always present on the system board as long as the - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 73
Lock use Computer Setup to unlock the lock. Refer to the Desktop Management Guide for more information about the Smart Cover Lock. If you cannot Key in any of the following circumstances: ● Power outage ● Startup failure ● Processor or power supply failure ● Lost password To open the computer cover - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 74
to the computer chassis. A padlock may also be used with a security cable to secure the computer to a fixed object. 62 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 75
Hood Sensor 1. Prepare the computer for disassembly (Preparation for Disassembly on page 60). 2. Remove the access panel (Computer Access Panel on page 64). 3. Disconnect the hood sensor cable from the system board. 4. Slide the hood sensor switch toward the front of the computer (1), and then pull - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 76
Before removing the computer access panel, ensure that the computer is turned off and that the power cord is disconnected from the electrical outlet. 2. Lift up on the access panel handle (1), the removal procedure. 64 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 77
Front Bezel 1. Prepare the computer for disassembly (Preparation for Disassembly on page 60). 2. Remove the computer access panel (Computer Access Panel on page 64). 3. Push up on the two release tabs (1), and then rotate the front bezel away from the chassis to release it (2). To reinstall the - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 78
proper orientation. The logo in the subpanel should be located at the bottom of the subpanel when properly oriented. 66 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 79
the heatsink. ● Do not jam cables on top of expansion cards or memory modules. Printed circuit cards like these are not designed to take excessive position the cables to lay properly by themselves. When removing the power supply power cables from the P1 or P3 connectors on the system board, - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 80
Power Supply Connector ID P1 P3 P4 P5 P6 P8 P9 P10 P11 Description Main power CPU power 1st Hard drive, SATA0 2nd HDD PATA/Zip/Media card reader Diskette drive 1st ODD or 2nd HDD if no ODD present, SATA1 2nd ODD 3rd ODD 68 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 81
timing), and CAS latency 6 DDR2 800 Mhz (6-6-6 timing) ● contain the mandatory JEDEC SPD information In addition, the computer supports: ● 512Mbit and 1Gbit non-ECC memory technologies ● single-sided and double-sided DIMMs ● DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 82
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 touching. 70 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 83
closed position (3). 5. Repeat steps 3 and 4 for any additional modules that you want to install. NOTE: The computer automatically recognizes the additional memory when the computer is turned on. To reassemble the computer, reverse the removal procedure. NOTE: If you normally lock the Smart Cover - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 84
PCI Express x1 expansion slots and one PCI Express x16 expansion slot. Item 1 2 3 4 5 6 Description PCI Express x16 expansion slot PCI Express x1 expansion slot PCI Express x1 expansion slot PCI expansion slot PCI expansion slot PCI and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 85
4. Press straight down on the two green thumb tabs inside the chassis (1) and rotate the expansion card retention latch up (2). 5. Before installing an expansion card, remove the expansion slot cover or the existing expansion card. NOTE: Before removing an installed expansion card, disconnect any - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 86
it. Be sure not to scrape the card against other components. 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 components during operation. 74 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 87
8. To install a new expansion card, slide the bracket on the end of the card down into the slot on the back of the chassis and press the card down firmly into the socket on the system board. NOTE: When installing an expansion card, press firmly on the card so that the whole connector seats properly - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 88
black. The HPsupplied 6-32 isolation mounting guide screws are silver and blue. 6-32 isolation mounting screws for the hard drive (shown below). M3 metric screws for all drives other than hard drives (shown below). 76 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 89
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 in standby mode. Before handling a drive, ensure that you are discharged of static - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 90
System Board Label SATA0 SATA1 SATA4 SATA5 MEDIA CARD FLOPPY Color dark blue white light blue orange black black 78 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 91
drive mounting bracket for these drive bays is available from HP. The bottom 5.25-inch drive bay has a shorter depth than the upper two bays. The bottom bay supports a half-height drive or other device that is no Setup. Refer to the Computer Setup (F10) Utility Guide for more information. Drives 79 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 92
Access Panel on page 64). 3. Remove the front bezel (Front Bezel on page 65). 4. Disconnect the power (1) and data (2) cables from the back of the drive. NOTE: The right-angle data cable must be the fan shroud. 80 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 93
old drive and install them in the replacement drive. NOTE: Extra 6-32 isolation guide screws are provided on the hard drive bracket under the access panel. Optical drives use M3 metric screws. The HP-supplied metric screws are black. 8. Store the removed drive in anti-static packaging. 9. Install - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 94
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 it now. 1. Unlock the Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 95
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). 4. Remove the four screws from the bottom of the hard drive carrier. Drives 83 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 96
the connector on the hard drive is pressed all the way into the connector on the carrier's circuit board. 84 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 97
7. Replace the four screws in the bottom of the carrier to hold the drive securely in place. 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). Drives 85 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 98
. 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. 86 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 99
guide screws. Eight extra metric guide screws are provided on the diskette drive bracket under the access panel. The HP-supplied metric screws are black. If you are replacing a drive, transfer the guides upper two bays. The bottom bay supports a half-height drive or other power connectors. Drives 87 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 100
6. Connect the power cable (1) and data cable (2) to the rear of the optical drive or diskette drive. 7. If you are installing a new media card reader, connect it to the USB system board connector labeled MEDIA CARD. 88 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 101
ReadyBoost Card A ReadyBoost card is installed in the computer. The card is secured to the chassis, and a cable connects the card to the system board. 1. Prepare the computer for disassembly (Preparation for Disassembly on page 60). 2. Remove the computer access panel (Computer Access Panel on page - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 102
65). 4. Disconnect the two I/O device cables and the power switch cable from the system board. 5. Remove the audio cable from the clip on top of the fan shroud. device and power switch, reverse the removal procedure. 90 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 103
Fan Shroud 1. Prepare the computer for disassembly (Preparation for Disassembly on page 60). 2. Remove the computer access panel (Computer Access Panel on page 64). 3. Pull up on all four shroud tabs simultaneously and slide the shroud from the heatsink. To reinstall the fan shroud, reverse the - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 104
the pins on the socket are very fragile and any damage to them may require replacing the system board. 92 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 105
Processor 1. Prepare the computer for disassembly (Preparation for Disassembly on page 60). 2. Remove the computer access panel (Computer Access Panel on page 64). 3. Remove the heatsink (Heatsink on page 92). 4. Rotate the locking lever to its full open position (1). 5. Raise and rotate the - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 106
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 reverse the removal procedures. 94 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 107
Rear Chassis Fan 1. Prepare the computer for disassembly (Preparation for Disassembly on page 60). 2. Remove the computer access panel (Computer Access Panel on page 64). 3. Disconnect the fan control cable from the system board. 4. Press down on the two upper tabs (1) to loosen the fan housing from - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 108
unit. Refer to the air flow arrows on the side of the fan housing for proper air flow orientation. 96 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 109
64). 3. Push down the green tabs (1), and then rotate the tab back 90 degrees out of the rear of the chassis (2). 4. Disconnect the serial port cable from the system board (3). 5. Remove the port assembly from the chassis (4). To install the serial port, reverse the removal procedure. Serial Port 97 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 110
computer (2), rotate toward the fan so the power supply clears the lip on the top of the chassis (3), and then lift the power supply out of the chassis (4). To install the power supply, reverse the removal procedure. 98 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 111
the front of the computer (2). 8. Lift the system board out of the computer (3). NOTE: When replacing the system board, you must also change the chassis serial number in the BIOS. System Board 99 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 112
is NOT connected to AC power. WARNING! This computer Guide for information on backing up the CMOS settings. NOTE: HP encourages customers to recycle used electronic hardware, HP instructions to replace the battery: 100 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 113
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 battery from its holder, squeeze - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 114
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. 102 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 115
Changing from a Desktop to a Minitower Configuration 1. Prepare the computer for disassembly (Preparation for Disassembly on page 60). 2. Remove the computer access panel (Computer Access Panel on page 64). 3. Remove the front bezel (Front Bezel on page 65). 4. Disconnect all power and data cables - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 116
The bottom bay supports a half-height drive. 8. Reconnect all power and data cables to the minitower configuration. 11. Reposition the subpanel (rotate it 90º) with the logo at the bottom, then snap it back into the bezel. 104 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 117
Changing from a Minitower to a Desktop Configuration 1. Prepare the computer for disassembly (Preparation for Disassembly on page 60). 2. Remove the computer access panel (Computer Access Panel on page 64). 3. Remove the front bezel (Front Bezel on page 65). 4. Disconnect all power and data cables - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 118
two bays. The bottom bay supports a half-height drive or 8. Reconnect all power and data cables desktop configuration. 11. Reposition the subpanel (rotate it 90º) with the logo at the bottom, then snap it back into the bezel. 106 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 119
Small Form Factor (SFF) Chassis Adherence to the procedures and precautions described in this chapter is essential for proper service to it. CAUTION: Turn off the computer before disconnecting any cables. Regardless of the power-on state, voltage is always present on the system board as long as the - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 120
key or PN 166527-002 for the screwdriver bit key. ● Refer to the HP Web site (http://www.hp.com) for ordering information. ● Call the appropriate number listed in the warranty or in the Support Telephone Numbers guide. 108 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 121
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 107). 2. Use the Smart Cover FailSafe Key to remove the tamper-proof screw that secures the Smart - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 122
security locks displayed below and on the following page can be used to secure the computer. Cable Lock Padlock 110 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 123
HP Business PC Security Lock 1. Fasten the security cable by looping it around a stationary object. 2. Thread the keyboard and mouse cables through the lock. External Security Devices 111 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 124
3. Screw the lock to the chassis using the screw provided. 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. 112 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 125
Computer Access Panel 1. Prepare the computer for disassembly (Preparation for Disassembly on page 107). 2. Press the buttons on the left and right sides of the computer (1), slide the access panel back until it stops, and then lift it up and off the chassis (2). To install the access panel, reverse - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 126
the chassis (2), and then remove the bezel from the chassis. To replace the front bezel, reverse the removal procedures. 114 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 127
Bezel Blanks On some 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. Prepare the computer for disassembly (Preparation for Disassembly on page 107). 2. Remove the access panel ( - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 128
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. 116 Chapter 8 Removal and Replacement Procedures Small Form Factor - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 129
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 130
(Computer Access Panel on page 113). 3. Locate 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. 118 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 131
tab on the memory socket. A DIMM must occupy the black DIMM1 socket. For maximum performance, populate the sockets so that the memory capacity is spread 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 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 132
PCI Express x1 expansion slots and one PCI Express x16 expansion slot. NOTE: The PCI and PCI Express slots support only low profile cards. An optional riser is available from HP that will support two full-height PCI . 120 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 133
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. 5. Before installing an expansion card, remove the - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 134
. Be sure not to scrape the card against the other components. 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 cover to close the open slot. 122 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 135
cables to the system board, if needed. 11. Replace the access panel. 12. If necessary, reconfigure the computer. Refer to the Computer Setup (F10) Utility Guide for instructions on using Computer Setup. Expansion Cards 123 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 136
or memory modules. Printed circuit cards like these are not designed to take excessive pressure on them. ● Keep cables clear of movable or rotating parts like the power supply and and result in a failed power supply. 124 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 137
Cable Connections System board connectors are color-coded to make it easier to find the proper connection. Cable Power Supply Power Supply Power Supply Power Supply Power Supply Power Supply To System board, 24-pin Diskette drive CPU power, 6-pin 1st SATA hard drive 2nd SATA hard drive Optical - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 138
hard drive, you will need to run the Restore Plus! CD to load the HP factory-installed files. Drive Positions 1 3.5-inch internal hard drive bay 2 5.25-inch Computer Setup (F10) Utility Guide for more information. 126 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 139
these guidelines: ● The primary Serial ATA (SATA) hard drive system does not support Parallel ATA (PATA) optical drives or PATA hard drives. ● You must install guide screws to ensure use M3 metric screws. The HP-supplied metric screws are black and the HP-supplied standard screws are silver. If you - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 140
a drive, shut down the operating system properly, turn off the computer, and unplug the power cord. Before handling a drive, ensure that you are discharged of static electricity. While handling : Handle With Care." 128 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 141
System Board Drive Connections Refer to the following illustration and table to identify the system board drive connectors. No. System Board Connector 1 Media Card Reader 2 Diskette Drive 3 SATA0 4 SATA1 5 SATA4 System Board Label MEDIA FLOPPY SATA0 SATA1 SATA4 Color black black dark - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 142
on page 107). 2. Remove the access panel (Computer Access Panel on page 113). 3. Rotate the drive cage to its upright position. 4. Disconnect the power cable (1) and data cable (2) from the rear of the optical drive. 130 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 143
lift it up and out of the drive cage (2). To replace the optical drive, reverse the removal procedure. NOTE: When replacing a drive, transfer the four guide screws from the old drive to the new one. Installing an Optical Drive into the 5.25-inch Drive Bay To install an optional 5.25-inch - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 144
M3 metric guide screws from the old drive to the new one. 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 locks into place. 132 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 145
the bottom side of the drive cage. The other is located on the chassis frame under the drive cage. Route the data cable 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. Drives 133 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 146
procedure in Removing an Optical Drive on page 130 to remove the optical drive and access the 3.5-inch drive. 134 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 147
2. Disconnect the drive cables, 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. b. If you are removing a media card reader, disconnect the USB cable from the system board. Drives 135 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 148
metric screws are black and the HP-supplied 6-32 standard screws are silver. Refer to Installing and Removing Drives on page 127 for illustrations of the guide screw locations. 1. Follow the procedure more information. 136 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 149
3. 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 locks into place. 4. Connect the appropriate drive cables: a. If installing a diskette drive, connect the power and data cables to the rear of the drive and - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 150
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 the cables or lock. 138 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 151
SATA and power cables through the cable guide on the bottom of the chassis frame behind the hard drive. If the system has only one SATA hard drive, the data cable must be connected to the dark blue connector labeled SATA0 on the system board to avoid any hard drive performance problems - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 152
the thermal sensor to the top of the hard drive (1) and move the thermal sensor away from the carrier (2). 140 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 153
4. Remove the four screws from the bottom of the hard drive carrier. 5. Slide the hard drive back to disconnect it from the carrier then lift it up and out of the carrier. Drives 141 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 154
's circuit board. 7. Replace the four screws in the bottom of the carrier to hold the drive securely in place. 142 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 155
. 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 143 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 156
board, and then lift the card assembly from the chassis. To install the ReadyBoost card, reverse the removal procedure. 144 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 157
Fan Shroud 1. Prepare the computer for disassembly (Preparation for Disassembly on page 107). 2. Remove the access panel (Computer Access Panel on page 113). 3. Lift the fan shroud straight up out of the chassis. To install the fan shroud, reverse the removal procedure. Fan Shroud 145 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 158
(3). To install the chassis fan, reverse the removal procedure. Be sure to orient the air flow into the unit. 146 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 159
146). 5. Rotate the drive cage to its upright position. 6. Disconnect the power switch/LED cable from the system board. 7. Squeeze the switch holder retaining 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 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 160
the front I/O device to the chassis (1). 7. Pull the device from the chassis and guide the cables through the hole to remove them from the chassis (2). To reinstall the front I/O device, reverse the removal procedure. 148 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 161
Heatsink 1. Prepare the computer for disassembly (Preparation for Disassembly on page 107). 2. Remove the access panel (Computer Access Panel on page 113). 3. Remove the fan shroud (Fan Shroud on page 145). 4. Disconnect the heatsink fan control cable from the system board. 5. Loosen the four - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 162
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. 150 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 163
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. Speaker 1. Prepare the computer for disassembly - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 164
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. 152 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 165
Access Panel on page 113). 3. Remove all PCI and PCI Express expansion boards (Expansion Cards on page 120). 4. Remove the fan shroud from the chassis (Fan Shroud on page 145). 5. Rotate the drive cage to its upright position. 6. Rotate the power supply to its full upright position. 7. Disconnect - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 166
8. Disconnect the serial port from the system board. 9. Disconnect the balance of the serial number in the BIOS. NOTE: The heatsink should be installed on the system board before the system board is reinstalled in the chassis. 154 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 167
107). 3. Remove the access panel (Computer Access Panel on page 113). 4. Rotate the drive cage to its upright position. 5. Remove the power supply (Power Supply on page 152). 6. If necessary, remove the SmartCover lock from the backwall of the chassis using the special security wrench and disconnect - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 168
to AC power. WARNING! HP encourages customers to recycle used electronic hardware, HP original print cartridges, and rechargeable batteries. For more information about recycling programs, go to http://www.hp.com/ recycle. 156 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 169
holder on your system board, complete the following instructions to replace the battery: Type 1 Battery Holder . 5. Plug in the computer and turn on power to the computer. 6. Reset the date and Setup. Refer to the Computer Setup (F10) Utility Guide. Type 2 Battery Holder 1. To release the battery - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 170
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 Computer Setup. Refer to the Computer Setup (F10) Utility Guide. 158 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 171
Ultra-Slim Desktop (USDT) Chassis Adherence to the procedures and precautions described in this chapter is essential for proper service before disconnecting any cables. Regardless of the power-on state, voltage is always present on PC is mounted in the accessory mounting stand, remove it - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 172
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. 160 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 173
HP Business PC Security Lock 1. Fasten the security cable by looping it around a stationary object. 2. Thread the keyboard and mouse cables through the lock. External Security Devices 161 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 174
3. Screw the lock to the chassis using the screw provided. 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. 162 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 175
Computer Access Panel To access internal components, you must remove the access panel: 1. Prepare the computer for disassembly (Preparation for Disassembly on page 159). 2. Loosen the thumbscrew on the rear of the computer (1), slide the access panel toward the front of the computer, and then lift - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 176
computer (1), and then rotate the bezel off from right to left (2). To replace the bezel, reverse the removal procedures. 164 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 177
Bezel Blanks 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. Prepare the computer for disassembly (Preparation for Disassembly on page 159). 2. Remove the computer access panel (Computer Access - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 178
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. 166 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 179
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 memory modules or system board. The memory module sockets have gold-plated metal contacts. When upgrading the memory, it is important to use memory - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 180
the memory socket. A SODIMM must occupy the DIMM1 (top) socket. 6. Replace the SODIMM in the DIMM1 socket if it was removed. The computer automatically recognizes the additional memory when you turn on the computer. 168 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 181
the heatsink. ● Do not jam cables on top of expansion cards or memory modules. Printed circuit cards like these are not designed to take excessive position the cables to lay properly by themselves. When removing the power supply power cables from the P1 or P3 connectors on the system board, - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 182
System board connectors are color-coded to make it easier to find the proper connection. System Board Connections System Board Connector Optical data/power Front Chassis fan Rear chassis the rear of the drive (3). 170 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 183
4. Slide the drive all the way out of the bay through the front bezel. Preparing a New Optical Drive Before you can use the new optical drive, attach the release latch. 1. Peel the backing off the adhesive on the release latch. 2. Without allowing the release latch to touch the optical drive, - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 184
. Leave it approximately 6 mm (1/4 inch) short of the fully-inserted locked position to allow room to connect the cable. 172 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 185
4. Connect the cable to the rear of the optical drive (1), and then slide the drive the rest of the way into the bay so that it locks in place (2). Optical Drive Connector 1. Prepare the computer for disassembly (Preparation for Disassembly on page 159). 2. Remove the computer access panel (Computer - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 186
Hard Drive NOTE: The Ultra-Slim Desktop supports only 2.5-inch Serial ATA (SATA) internal hard drives; parallel ATA (PATA) internal hard drives are not supported. The 2.5-inch hard drive is enclosed in a carrier under the optical drive. 1. Prepare the computer for disassembly (Preparation for - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 187
6. To remove the hard drive from the carrier, remove the guide screw from the front left side of the carrier. 7. Slide the carrier back and remove the hard drive. Hard Drive 175 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 188
drive. 9. Align the guide screws with the slots on the carrier and slide the new hard drive into the carrier (1), then replace the guide screw on the front left of the carrier to secure the drive in the carrier (2). 176 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 189
10. To place the hard drive carrier back in the chassis, align the guide screws with the slots on the drive bay, drop the carrier straight down into the drive bay (1), and press the handle on the carrier all - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 190
(3), and then lift the cage out of the chassis (4). To install the hard drive cage, reverse the removal procedures. 178 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 191
lock to the chassis that locks the port cover and secures the computer. See Cable Lock on page 160. The port cover 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 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 192
board, and then lift the card assembly from the chassis. To install the ReadyBoost card, reverse the removal procedure. 180 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 193
Fan 1. Prepare the computer for disassembly (Preparation for Disassembly on page 159). 2. Remove the computer access panel (Computer Access Panel on page 163). 3. Disconnect the fan control cable from the system board. 4. Lift the fan straight up and out of the chassis. To install the fan, reverse - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 194
then slide the speaker up to remove it from the chassis (2). To install the speaker, reverse the removal procedure. 182 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 195
I/O Panel 1. Prepare the computer for disassembly (Preparation for Disassembly on page 159). 2. Remove the computer access panel (Computer Access Panel on page 163). 3. Remove the screw from the left side of the panel that holds the I/O panel in place (1). 4. Press the tab on left side of the panel - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 196
the pins on the socket are very fragile and any damage to them may require replacing the system board. 184 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 197
5. Lay the heatsink on its top in a safe area to prevent the thermal grease from contaminating the work surface. If reusing the existing heatsink go to step 1. If using a new heatsink, go to step 3. 1. If reusing the existing heatsink, clean bottom of the heatsink and apply the thermal grease - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 198
thermal grease provided in the spares kit to the top of the processor. 4. Position the heatsink atop the processor. 186 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 199
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 the Optical Drive on page 170). 4. Remove the memory modules (Memory on page 166). 5. Remove the hard drive (Hard - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 200
procedure. NOTE: When replacing the system board, you must also change the chassis serial number in the BIOS. Rear Chassis Fan 1. Prepare the computer for disassembly (Preparation for Disassembly on to the chassis (1). 188 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 201
The lithium battery is only used when the computer is NOT connected to AC power. WARNING! This computer contains an internal lithium manganese dioxide battery. There is Guide for information on backing up the CMOS settings. NOTE: HP encourages customers to recycle used electronic hardware, HP - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 202
procedure. 6. Plug in the computer and turn on power to the computer. 7. Reset the date and time, your passwords, and any special system setups, using Computer Setup. Refer to the Computer Setup (F10) Utility Guide. 190 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 203
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 Mouse Connector and Icon Pin Signal 1 Data 2 Unused - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 204
Ethernet 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 Negative AUI Differential Transmit 5 Positive AUI Differential Transmit 6 Ground 7 Ground 8 Negative AUI Differential - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 205
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 206
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 23 194 Appendix A Connector Pin Assignments Pin Signal 1 +5 VDC 2 - Data - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 207
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 208
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 DD13 Pin Signal 15 DD1 16 DD14 17 DD0 18 DD15 19 Ground 20 (Key) 21 DMARQ 22 Ground 23 DIOW 24 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 209
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 210
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 198 Appendix A Connector Pin Assignments - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 211
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 Signal S4 Ground P4 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 212
GND 78 GND 79 GND 80 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 GND 68 PERp12 69 PERn12 70 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 213
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 214
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 215
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 switches are equipped with internal switches that sense the incoming voltage and automatically switch to the proper voltage. The - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 216
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 for evaluation in the - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 217
that you may encounter during Power-On Self-Test (POST) or computer restart, the probable source of the problem, and steps you can take that does not run all of the system level tests, such as the memory test. Full Boot runs all of the ROM-based system tests and takes Setup (F10) Utility Guide. 205 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 218
Memory Space for Option ROMs Recently added PCI expansion card contains 1. an option ROM too large to download during POST. If a PCI expansion card was recently added, remove it to see if the problem the problem persists, replace the RTC battery. See the Hardware Reference Guide for instructions on - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 219
Setup or Windows utilities. 2. Make sure the memory module(s) are installed properly. 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. Run Computer Setup or Windows utilities. 2. Ensure memory modules are - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 220
3. Verify monitor is attached and turned on. 4. Replace the graphics card (if possible). 510-Flash Screen Image Corrupted Flash Screen image has errors. Reflash the system ROM with the latest BIOS image. 511-CPU, CPUA, or CPUB Fan not Detected CPU fan is not connected or may have malfunctioned - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 221
or Windows utilities. 1155-Serial Port Address Conflict Detected Both external and internal serial ports are assigned to same IRQ. 1. Remove any serial port expansion cards. 2. Clear CMOS. 3. Reconfigure card resources and/or run Computer Setup or Windows utilities. 1201-System Audio Address - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 222
supported by ROM BIOS. 1. Upgrade BIOS to proper version. 2. Change the processor. 2200-PMM Allocation Error during MEBx Download Memory error during POST execution of the 1. Management Engine (ME) BIOS Extensions option ROM 2. Reboot the computer. Unplug the power cord, re-seat the memory - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 223
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 224
Power LED flashes two 2 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 . 4. Contact an authorized reseller or service provider. 212 Appendix C POST Error Messages - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 225
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 226
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 227
Table C-2 Diagnostic Front Panel LEDs and Audible Codes (continued) Activity Beeps Possible Cause Recommended Action 3. Check that both power supply cables are properly connected to the system board. 4. Check to see if the 5V_aux light on the system board is turned on. If it is - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 228
D Troubleshooting Without Diagnostics This chapter provides information on how to identify and correct minor problems, such as diskette drive, hard drive, optical drive, graphics, audio, memory, and software problems. If you encounter problems with the computer, refer to the tables in this chapter - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 229
the drivers loaded. When booting the operating system, use "Last Known Configuration." ● Refer to the comprehensive online technical support at http://www.hp.com/support. ● Refer to the following Helpful Hints on page 217 section in this guide. To assist you in resolving problems online, HP Instant - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 230
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 237 for instructions. ● Be sure that all the needed device drivers have been installed. For - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 231
mode, press the power button or press any key. CAUTION: When attempting to resume from standby mode, do not hold down the power button for more than 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 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 232
memory. 2. Add more memory. Some applications run in the background and can be closed by right-clicking on their corresponding icons in the task tray. To prevent these applications from launching at startup, go to Start > Run (Windows XP) or Start > Accessories > Run 220 Appendix D Troubleshooting - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 233
in the application. 2. Add more memory. 3. Upgrade the graphics solution. Cause unknown. Restart the computer. 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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 234
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 235
adapter is being used on the USDT. The USDT power supply adapter must be at 135W and use the Smart ID technology 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 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 236
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 Format the diskette. 1. From Windows Explorer select the disk (A) drive Troubleshooting Without Diagnostics - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 237
problem with a file. In Microsoft Windows XP, right-click Start, click Explore, and select a drive. Select File > Properties > Tools. Under Errorchecking, click Check Now. In Microsoft Windows occurred. Restart the computer by pressing the power button. Cannot Boot to Diskette. Cause Solution - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 238
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 239
attached to a SATA port that has been hidden beep codes. See the Worldwide Limited Warranty for terms and conditions. Computer seems to be locked up. Cause Program in use has stopped responding to commands. Solution Attempt the normal Windows "Shut Down" procedure. If this fails, press the power - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 240
down the computer and contact HP for a replacement been activated. enclosure. Solving Media Card Reader Problems Table D-5 Solving Media Card Reader Problems Media card will not work in a digital camera after formatting it in Microsoft Windows XP or Microsoft Windows Vista. Cause Solution By - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 241
supported. on the correct side. The green LED will light if inserted properly. Do not know how to remove a media card correctly. Cause The computer's software is used to safely eject the card. Solution Open My Computer (Windows XP) or Computer (Windows available ports, and then recognize the PC - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 242
D-6 Solving Display Problems Blank screen (no video). Cause Solution Monitor graphics connector and an add-in graphics card connector, plug the monitor cable into the graphics card connector on the back of the computer. Monitor settings in the computer are not compatible with the 1. In Windows XP - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 243
-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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 244
Table D-6 Solving Display Problems (continued) Blurry video or requested resolution cannot be set. Cause Solution If the graphics controller was upgraded, the correct graphics Install the video drivers included in the upgrade kit. drivers may not be loaded. Monitor is not capable of displaying - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 245
menu. Manually synchronize the Clock and Clock Phase onscreen display functions. To download a SoftPaq that will assist you with the synchronization, go to the following Web site, select the appropriate monitor, and download either SP32347 or SP32202: http://www.hp.com/support Graphics card is - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 246
Audio Problems Sound cuts in and out. Cause Processor resources are being used by other open applications. Direct sound latency, common in many media player applications. Solution Shut down all open processor-intensive applications. In Windows XP power button to Troubleshooting Without Diagnostics - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 247
. Cause Solution Jack has been reconfigured in the audio driver or application In the audio driver or application software, reconfigure the jack software. or set the jack to its default value. Solving Printer Problems If you encounter printer problems, see the documentation that came with the - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 248
following table. Table D-9 Solving Keyboard 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, click Start > Shut Down. On the Windows Vista Desktop, click Start, click the arrow on - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 249
enabled) in Computer Setup. Table D-10 Solving Mouse Problems Mouse does not respond to movement or is too and Esc keys at the same time (or press the Windows logo key) to display the Start menu. 2. Use . Computer is in standby mode. Press the power button to resume from standby mode. CAUTION: - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 250
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 251
with HP memory. 4. Replace the system board. 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 Graphics card is not seated properly or is bad, or - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 252
Problems Wake-on-LAN feature is not functioning. Cause Wake-on-LAN is not enabled. Solution To enable Wake-on-LAN in Windows XP: 1. Select Start > Control Panel. 2. Double-click Network Connections. 3. Double-click Local Area Connection. 4. Click Properties. 5. Click Configure. 6. Click the Power - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 253
Network Problems (continued) Network status link light never flashes. NOTE: The network status light is supposed to flash when there is network activity. Cause Solution Network controller is not set up properly. Check for the device status within Windows, such as Device Manager for driver load - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 254
The files containing the network drivers are corrupted. Reinstall the network drivers, using the Recovery Disc Set service provider. Solving Memory Problems If you encounter memory problems, some common causes and solutions are listed in the following table. 242 Appendix D Troubleshooting - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 255
the DIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a DIMM module. For those systems that support ECC memory, HP does not support mixing ECC and non-ECC memory. Otherwise, the computer will not boot the operating system. NOTE: The - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 256
Memory Problems (continued) Power LED flashes Red five times, once every second, followed by a two second pause, and the computer beeps five times. (Beeps stop after fifth iteration but LEDs continue flashing.) Cause Solution Memory The current processor does not support a feature previously 1. - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 257
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 dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 258
Problems media played, such as audio or video. Wait at least 30 , available from most computer stores. Windows does not detect the CD-ROM or the computer and let Windows detect the CD or DVD driver. Recording or copying varies widely between manufacturers. USDT computer boots too slow after - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 259
table. Table D-16 Solving Drive Key Problems USB Drive Key is not seen as a drive letter in Windows. Cause Solution The drive letter after the the Setup: Creating a Bootable Device: Supported USB Flash Media Device" section of the Service Reference Guide. The computer boots to DOS after - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 260
power, be sure one end is connected to the device and one end is connected to a live outlet. The correct device driver is not installed. 1. Install the correct driver the USB ports. Solving Internet Access Problems If you encounter Internet access problems, consult your Internet Service Provider - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 261
your ISP and launch the desired program. Internet takes too long to download Web sites. Cause Modem is not set up properly. Solution Verify that the modem is connected and communicating properly. Windows XP 1. Select Start > Control Panel. 2. Double-click System. 3. Click the Hardware tab. 4. In - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 262
it is supported on the system. If you encounter software problems, see the applicable solutions listed in the following table. Table D-19 Solving Software Problems Computer will not continue and no HP logo screen has appeared. Cause Solution POST error has occurred. Observe the beeps and LED - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 263
http://www.hp.com. NOTE: If you take the 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 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 264
used on most but not all HP system and riser boards. Designator BAT Battery socket/Battery LED - 5V_Aux (on) Health-LED UID LED Power LED Hard drive activity LED Boot block header/jumper Boot block connector SPDIF input SPDIF output PCI slots PCI extender slot (male) PCI Express slots Primary SCSI - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 265
slot for graphics First 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 DVI connector Keyboard connector, PS/2 (Closest to power supply - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 266
panel audio P24 Header for front panel USB P25 Internal USB connector 1 P26 Internal USB connector 2 P27 MultiBay header P29 SCSI LED connector P30 PCI extender slot (female) P40 Blade PC graphics connector (outboard) P41 Blade PC graphics connector (inboard) P52 Second serial port - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 267
serial port Double stack serial port, Top = Serial B, Bottom = Serial A Riser edge connector (male-mates with J30) PrimarySerial ATA (SATA) connector Second Serial ATA (SATA) connector Third Serial ATA (SATA) connector Fourth Serial ATA (SATA) connector VSFF expansion connector Graphics option - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 268
footprint TMDS controller Parallel port diode array First serial port transceiver Second serial port transceiver VRM 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 retainer Memory slot. DIMM1 or RIMM1 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 269
Y4 Y5/H5 Secondary NIC clock crystal RTC clock crystal/tie-down 257 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 270
codes 212 audio problems 233 B backup 28 Backup and Recovery Manager 28 backwall, SFF removal and replacement 155 battery CMT removal and replacement 100 disposal 59 SFF removal and replacement 156 USDT removal and replacement 189 beep codes 212 bezel blanks SFF removal and replacement 115 USDT - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 271
deployment tools, software 21 desktop conversion 105 diagnostic tool for hard drives 47 diagnostics utility 15 DIMMs. See memory disassembly preparation CMT 60 SFF 107 USDT 159 disk, cloning 21 diskette drive installing 87 diskette problems 223 DiskOnKey bootable 35, 36 HP Drive Key 35 drive bezel - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 272
slot cover removing CMT 73 removing SFF 121 replacing 74, 123 F FailSafe Key caution 46 CMT 61 ordering 46 SFF 108 fan USDT removal and replacement 181 fan shroud CMT removal and replacement 91 SFF removal and replacement 145 fan, power supply 57 Fault Notification and Recovery HP Client Manager 47 - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 273
160 HP Business PC Security Lock 161 M media card reader installing 87 Media Card Reader problems 228 memory CMT removal and replacement 69 populating sockets 117 SFF removal and replacement 116 specifications 116 USDT specifications 166 memory problems 242 microphone pin assignments 194 minitower - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 274
47 HP Business PC Security Lock 111, 161 HP ProtectTools Security Manager 26 password 41 settings 38 SFF 110 SFF cable lock 110 SFF padlock 110 Smart Cover Lock 45 Smart Cover Sensor 45 USDT 160 serial interface pin assignments 193 serial port CMT removal and replacement 97 service considerations - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 275
15 screwdriver 57 speaker CMT removal and replacement 94 SFF removal and replacement 151 USDT removal and replacement 182 specifications CMT memory 69 SFF memory 116 USDT SODIMMs 166 static electricity 53 Subscriber's Choice 31 surge-tolerant power supply 47 system board CMT removal and replacement - Compaq dc7800 | Service Reference Guide - HP Compaq dc7800 Business PC - Page 276
240 Web sites BIOS download 31 HP Client Foundation Suite 27 HP Client Foundation Suite and Client Premium Suite 23 HP Client Manager 26 HP Client Premium Suite 27 HP OpenView Client Configuration Manager 27 HP OpenView PC Configuration Management Solution 22, 28 HP ProtectTools Security Manager
Service Reference Guide
HP Compaq dc7800 Business PC