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Installing I/O Cards

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Field Replaceable Units FRU Removal and Replacement Installing I/O Cards To install a new I/O card, do the following: NOTE Slots two and four are the graphics card slots. The primary graphics card slot is slot number two and the secondary graphics card slot is slot number four. 1. Open the left side panel of the system unit as explained in the section "Opening the Left Side Panel of the System Unit" in this chapter. 2. Locate the appropriate slot for the I/O card that is to be installed. See Figure 4-12. 3. Unscrew the T-15 Torx screw from the bulkhead blank of the slot you have chosen. If no blank is present, you may skip to step four. 4. Pull evenly in the direction of the arrow on both sides of the I/O card retainer to remove it. See Figure 4-13. 5. Insert the I/O card into the slot you have chosen with the bulkhead appropriately positioned. The ends of the card should be placed in the I/O card guides. Press ﬁrmly and evenly on the I/O card until it is in the connector. Screw the T-15 Torx screw into the I/O card's bulkhead to secure the I/O card. 6. Replace the I/O card retainer by placing the bottom retainer clip in the slot on the air divider and the clips on the PULL tabs snap into their slots on the upper chassis. 7. Close the left side panel of the system unit by following the procedure in the section "Closing the Left Side Panel of the System Unit" in this chapter. 108 Chapter 4

Section	Page
Service Handbook	1
Service Handbook	1
Service Handbook	1
HP Visualize B1000/C3000 UNIX® Workstations	1
Manufacturing Part Number: n.a.	1
Printed in USA May 2001	1
Edition E0501	1
Notice	2
Notice	2
The information contained in this document is subject to change without notice. Hewlett-Packard a...	2
Hewlett-Packard Warranty Statement	2
Hewlett-Packard Warranty Statement	2
HP PRODUCT DURATION OF WARRANTY HP Visualize Wo...	2
Model B1000/C3000	2
1. HP warrants HP hardware, accessories and supplies against defects in materials and workmanship...	2
1. HP warrants HP hardware, accessories and supplies against defects in materials and workmanship...	2
1. HP warrants HP hardware, accessories and supplies against defects in materials and workmanship...	2
2. HP warrants that HP software will not fail to execute its programming instructions, for the pe...	2
2. HP warrants that HP software will not fail to execute its programming instructions, for the pe...	2
3. HP does not warrant that the operation of HP products will be uninterrupted or error free. If ...	2
3. HP does not warrant that the operation of HP products will be uninterrupted or error free. If ...	2
4. HP products may contain remanufactured parts equivalent to new in performance or may have been...	2
4. HP products may contain remanufactured parts equivalent to new in performance or may have been...	2
5. The warranty period begins on the date of delivery or on the date of installation if installed...	2
5. The warranty period begins on the date of delivery or on the date of installation if installed...	2
6. Warranty does not apply to defects resulting from (a) improper or inadequate maintenance or ca...	2
6. Warranty does not apply to defects resulting from (a) improper or inadequate maintenance or ca...	2
7. TO THE EXTENT ALLOWED BY LOCAL LAW, THE ABOVE WARRANTIES ARE EXCLUSIVE AND NO OTHER WARRANTY O...	3
7. TO THE EXTENT ALLOWED BY LOCAL LAW, THE ABOVE WARRANTIES ARE EXCLUSIVE AND NO OTHER WARRANTY O...	3
8. HP will be liable for damage to tangible property per incident up to the greater of $300,000 o...	3
8. HP will be liable for damage to tangible property per incident up to the greater of $300,000 o...	3
9. TO THE EXTENT ALLOWED BY LOCAL LAW, THE REMEDIES IN THIS WARRANTY STATEMENT ARE CUSTOMER’S SOL...	3
9. TO THE EXTENT ALLOWED BY LOCAL LAW, THE REMEDIES IN THIS WARRANTY STATEMENT ARE CUSTOMER’S SOL...	3
Restricted Rights Legend	3
Restricted Rights Legend	3
Use, duplication, or disclosure by the U.S. Government Department of Defense is subject to restri...	3
© Copyright 2001 Hewlett-Packard Company. All Rights Reserved.	3
This document contains proprietary information that is protected by copyright. All rights are res...	3
UNIX is a registered trademark in the United States and other countries, licensed exclusively thr...	3
© Copyright 1980, 1984 AT&T, Inc.	3
© Copyright 1979, 1980, 1983 The Regents of the University of California.	3
This software and documentation is based in part on the Fourth Berkeley Software Distribution und...	3
Printing History	4
Printing History	4
New editions of this manual incorporate all material updated since the previous edition. Update p...	4
The manual part number and printing date indicate its current edition. The manual part number cha...	4
HP Part Number Printing Date Edition	4
Non-Applicable May 2001 First	4
1 Product Information	17
1 Product Information	17
This chapter introduces the HP Visualize B1000/C3000 workstations, including their controls and i...	17
This chapter introduces the HP Visualize B1000/C3000 workstations, including their controls and i...	17
Included in this chapter are the following topics:	18
• Product description	18
• Product description	18
• Product description	18
• Product description	18
• System unit front panel controls	18
• System unit front panel controls	18
• System unit rear panel connectors	18
• System unit rear panel connectors	18
• Monitor information	18
• Monitor information	18
• Keyboard and Mouse information	18
• Keyboard and Mouse information	18
• Operating System Overview	18
• Operating System Overview	18
B1000/C3000:product description,	19
B1000/C3000:product description,	19
B1000/C3000:product description,	19
The HP Visualize B1000 and C3000 workstations contain the following key features:	19
The HP Visualize B1000 and C3000 workstations contain the following key features:	19
• Processor:	19
• Processor:	19
• Processor:	19
— One 300MHz PA8500 processor in the B1000 or one 400MHz PA8500 processor in the C3000	19
— One 750MHz PA8700 processor in the C3700	19
— The PA8500 processor has a 0.5MByte instruction cache and a 1.0MByte data cache	19
— The PA8700 processor has a 0.75MByte instruction cache and a 1.5MByte data cache	19
• Operating System:	19
• Operating System:	19
The B1000/C3000 requires the HP-UX 10.20 and Workstation Additional Core Enhancements (ACE) for H...	19
• User Interface:	19
• User Interface:	19
HP CDE graphical user interface	19
• Compatibility: Source and binary code compatible with the Series 700 product family	19
• Compatibility: Source and binary code compatible with the Series 700 product family	19
• Monitors:	19
• Monitors:	19
— 21-inch 1280¥1024 (stereo capability) and 1600¥1200 color, 75Hz	19
• Optional Graphics:	19
• Optional Graphics:	19
HP Visualize-EG and Visualize fx2 Pro (for B1000)	19
HP Visualize-EG, Visualize fx2 Pro and Visualize fx4 Pro (for C3000)	19
• Main Memory:	19
• Main Memory:	19
— 128MByte and 256MByte DIMMs for B1000 and C3000 workstations	19
— Eight memory slots available per each B1000 and C3000 workstations	19
— Minimum of 128MBytes and a maximum of 2GBytes of memory (B1000 and C3000)	19
• Internal Storage Devices:	19
• Internal Storage Devices:	19
– Wide Ultra2 Low-Voltage Differential SCSI – up to two:	19
9.0 GB Hard Disk Drive	19
18.0 GB Hard Disk Drive	19
– Removable Media (one of each maximum)	19
CD-ROM Drive	19
Floppy Disk Drive	20
• Standard Network:	20
• Standard Network:	20
– RJ45, Twisted Pair 10 BaseT/100 BaseT	20
• Standard I/O Ports:	20
• Standard I/O Ports:	20
— Ultra2 Wide Low-Voltage Differential (LVD) SCSI, one	20
— Ultra Narrow Single-Ended (NSE) SCSI, one	20
— Parallel port (IEEE 1284), one	20
— Universal Serial Bus (USB) ports, two	20
— Serial Interface ports (RS-232C), two	20
— Audio ports (Line-in, Line-out, headset, and microphone-in)	20
• Optional I/O:	20
• Optional I/O:	20
Six PCI slots are available for the B1000/C3000 workstations.	20
– 1 PCI 4X:64 bit, 66 MHz, primary graphics (full size, 3.3V)	20
– 2 PCI 1X:32 bit, 33 MHz, (half size, 5V)	20
– 3 PCI 2X:64 bit, 33 MHz, (full size, 5V)	20
• Keyboard:	20
• Keyboard:	20
– Universal Serial Bus (USB) keyboard, one	20
• Mouse:	20
• Mouse:	20
– Universal Serial Bus (USB) mouse, one	20
System Unit Front Panel Controls	21
System Unit Front Panel Controls	21
Figure 1-1 shows the location of the system unit front panel controls.	21
Figure 1-1 shows the location of the system unit front panel controls.	21
Figure11. System Unit Front Panel Controls	21
Figure11. System Unit Front Panel Controls	21
<GRAPHIC>	21
LCD:location,	21
LCD:location,	21
The Liquid Crystal Display (LCD) is located on the left side of the front panel. The LCD displays...	21
LCD:symbols,	22
LCD:symbols,	22
LCD:symbols,	22
<GRAPHIC>	22
Power switch:soft power down procedure,	22
Power switch:soft power down procedure,	22
Use the Power switch to power the system unit on and off. When you use the soft power down proced...	22
Storage Device:controls and features,	22
Storage Device:controls and features,	22
Storage Device:controls and features,	22
This workstation allows either or both of the following internal storage devices: CD drive or flo...	22
NOTE You cannot have two internal storage devices of the same type. For example, you cannot have ...	22
NOTE You cannot have two internal storage devices of the same type. For example, you cannot have ...	22
Figure 13.	22
Figure 13.	22
Storage device:CD drive,	23
Storage device:CD drive,	23
Storage device:CD drive,	23
<GRAPHIC>	23
Table11. CD Drive Controls	23
<TABLE HEADING>	23
<TABLE ROW>	23
Control/Feature	23
Control/Feature	23
Purpose	23
Purpose	23
<TABLE BODY>	23
<TABLE ROW>	23
Eject Button	23
Press to open the Disc Tray and insert or remove a disc. When the drive is in use, press the ejec...	23
<TABLE ROW>	23
Emergency Eject	23
Emergency Eject	23
If the workstation does no have power, you can insert the end of a paper clip into this small hol...	23
If the workstation does no have power, you can insert the end of a paper clip into this small hol...	23
<TABLE ROW>	23
Disk Tray	23
Disk Tray	23
The Disk Tray holds the CD. This style of CD drive does not use a disk caddy.	23
The Disk Tray holds the CD. This style of CD drive does not use a disk caddy.	23
<TABLE ROW>	23
Busy Indicator	23
Busy Indicator	23
Lights during a data access operation and blinks during a data transfer. The indicator blinks ini...	23
Lights during a data access operation and blinks during a data transfer. The indicator blinks ini...	23
• A defective disc	23
• A defective disc	23
• A defective disc	23
• A disc insertion error (for example, an upside down disc)	23
• A disc insertion error (for example, an upside down disc)	23
• No disc present	23
• No disc present	23
NOTE The audio features of the CD drive are supported through applications only. One such applica...	23
NOTE The audio features of the CD drive are supported through applications only. One such applica...	23
The optional	24
Figure 14.	24
Figure 14.	24
Figure14. Floppy Drive Controls and Features	24
Figure14. Floppy Drive Controls and Features	24
<GRAPHIC>	24
Table12. Floppy Drive Controls and Features	24
<TABLE HEADING>	24
<TABLE ROW>	24
Control/Feature	24
Purpose	24
Purpose	24
<TABLE BODY>	24
<TABLE ROW>	24
Floppy Drive Eject Button	24
Floppy Drive Eject Button	24
Push the eject button to remove floppy diskettes from the drive.	24
Push the eject button to remove floppy diskettes from the drive.	24
<TABLE ROW>	24
Floppy Drive Activity LED	24
Floppy Drive Activity LED	24
The floppy drive LED flashes to indicate the drive is in use.	24
The floppy drive LED flashes to indicate the drive is in use.	24
Security Lock	24
Security Lock	24
Access to the mass storage devices is controlled by a security lock on the front panel. Locking t...	24
To prevent access to internal components requires the use of the security loop on the rear panel ...	24
Rear Panel Connectors:	25
Rear Panel Connectors:	25
Rear Panel Connectors:	25
This section describes the following connectors on the system unit’s rear panel:	25
This section describes the following connectors on the system unit’s rear panel:	25
• Two serial ports (RS-232)	25
• Two serial ports (RS-232)	25
• Two serial ports (RS-232)	25
• Two serial ports (RS-232)	25
• Two Universal Serial Bus ports (USB)	25
• LAN connector, 10 BaseT/100 BaseT	25
• LAN connector, 10 BaseT/100 BaseT	25
• HP parallel IEEE 1284 (printer) connector	25
• Audio connectors (PCI based, line in, line out, headset, and microphone in)	25
• Audio connectors (PCI based, line in, line out, headset, and microphone in)	25
• Ultra2 Wide LVD (Low Voltage Differential) SCSI	25
• Ultra2 Wide LVD (Low Voltage Differential) SCSI	25
• Ultra Narrow Single-Ended (NSE) SCSI	25
• Ultra Narrow Single-Ended (NSE) SCSI	25
• TOC (transfer of control) button	25
• TOC (transfer of control) button	25
• AC power cord connector	25
• AC power cord connector	25
• Security loop	25
• Security loop	25
NOTE To maintain FCC/EMI compliance, verify that all cables are fully seated and properly fastened.	25
NOTE To maintain FCC/EMI compliance, verify that all cables are fully seated and properly fastened.	25
Figure15. System Unit Rear Panel Connectors	25
Figure15. System Unit Rear Panel Connectors	25
<GRAPHIC>	26
Rear Panel Connectors:audio connectors,	26
Rear Panel Connectors:audio connectors,	26
The Model B1000 and C3000 workstations have audio-input and -output capabilities through external...	26
The rear panel contains the Audio IN (Stereo line-in) and Microphone (Mic-in), and Audio OUT (Ste...	26
The audio connectors are standard stereo audio mini-jacks (see Figure 1-6).	26
NOTE Hewlett-Packard recommends using gold-plated plugs available through audio retailers for bes...	26
NOTE Hewlett-Packard recommends using gold-plated plugs available through audio retailers for bes...	26
Figure16. Audio Connectors	26
Figure16. Audio Connectors	26
<GRAPHIC>	26
Table 13.	26
<TABLE>	27
Table13. Audio Electrical Specifications	27
<TABLE BODY>	27
<TABLE ROW>	27
Frequency Response	27
Frequency Response	27
25 to 20KHz	27
25 to 20KHz	27
<TABLE ROW>	27
Input Sensitivity/Impedance	27
Input Sensitivity/Impedance	27
<TABLE ROW>	27
Line in	27
Line in	27
2.0V pk/47kohm	27
2.0V pk/47kohm	27
<TABLE ROW>	27
Microphone in	27
Microphone in	27
22mVpk/1kohm	27
22mVpk/1kohm	27
<TABLE ROW>	27
Max Output Level/Impedance	27
Max Output Level/Impedance	27
<TABLE ROW>	27
Line Out	27
Line Out	27
2.8Vpp/47kohm	27
2.8Vpp/47kohm	27
<TABLE ROW>	27
Headphone	27
Headphone	27
2.75Vpp/50ohm	27
2.75Vpp/50ohm	27
<TABLE ROW>	27
Speaker (internal)	27
Speaker (internal)	27
5.88Vpp/48ohm	27
5.88Vpp/48ohm	27
<TABLE ROW>	27
Output Impedance	27
Output Impedance	27
<TABLE ROW>	27
Line Out	27
Line Out	27
619ohm	27
619ohm	27
<TABLE ROW>	27
Headphone	27
Headphone	27
118ohm	27
118ohm	27
USB:,	27
USB:,	27
USB:,	27
The USB connectors located on the rear panel of the workstation provide an interface for the keyb...	27
The USB connectors located on the rear panel of the workstation provide an interface for the keyb...	27
For more information on the Universal Serial Bus, refer to the following URL:	27
	27
CAUTION Usage of devices other than USB specification may result in unpredictable functionality a...	27
CAUTION Usage of devices other than USB specification may result in unpredictable functionality a...	27
NOTE The USB clip on the rear of the chassis provides strain relief for the USB cables.	27
NOTE The USB clip on the rear of the chassis provides strain relief for the USB cables.	27
Rear Panel Connectors:parallel,	27
Rear Panel Connectors:parallel,	27
Rear Panel Connectors:parallel,	27
The 25-pin HP Parallel I/O interface uses IEEE 1284 I/O interface protocols to support peripheral...	27
The 25-pin HP Parallel I/O interface uses IEEE 1284 I/O interface protocols to support peripheral...	27
Rear Panel Connectors:network,	27
Rear Panel Connectors:network,	27
Rear Panel Connectors:network,	27
The B1000/C3000 workstations have a built-in Twisted Pair (TP) connector for the 802.3 (ETHERNET)...	27
Rear Panel Connectors:serial,	28
Rear Panel Connectors:serial,	28
Rear Panel Connectors:serial,	28
There are a variety of peripheral devices that can attach to the RS-232 Serial Input/Output (SIO)...	28
The SIO ports are programmable, allowing functions such as bit rate, character length, parity, an...	28
Table 14.	28
Table 14.	28
<TABLE>	28
Table14. Serial I/O Pins	28
<TABLE HEADING>	28
<TABLE ROW>	28
Pin No.	28
Pin No.	28
Signal	28
Signal	28
Description	28
Description	28
<TABLE BODY>	28
<TABLE ROW>	28
1	28
1	28
DCD	28
DCD	28
Data Carrier Detect	28
Data Carrier Detect	28
<TABLE ROW>	28
2	28
2	28
RXD	28
RXD	28
Receive Data	28
<TABLE ROW>	28
3	28
3	28
TXD	28
TXD	28
Transmit Data	28
<TABLE ROW>	28
4	28
4	28
DTR	28
DTR	28
Data Terminal Ready	28
<TABLE ROW>	28
5	28
5	28
GND	28
GND	28
Ground	28
Ground	28
<TABLE ROW>	28
6	28
6	28
DSR	28
DSR	28
Data Set Ready	28
Data Set Ready	28
<TABLE ROW>	28
7	28
7	28
RTS	28
RTS	28
Request To Send	28
Request To Send	28
<TABLE ROW>	28
8	28
8	28
CTS	28
CTS	28
Clear To Send	28
Clear To Send	28
<TABLE ROW>	28
9	28
9	28
RI	28
RI	28
Ring Indicator	28
Ring Indicator	28
SCSI:connectors,	28
SCSI:connectors,	28
SCSI:connectors,	28
The B1000/C3000 workstations have built in SCSI connectors for Ultra2 Wide Low-Voltage Differenti...	28
NOTE There must ALWAYS be a terminator at both ends of a SCSI bus. This means one internal termin...	28
NOTE There must ALWAYS be a terminator at both ends of a SCSI bus. This means one internal termin...	28
Rear Panel Connectors:TOC,	29
Rear Panel Connectors:TOC,	29
Rear Panel Connectors:TOC,	29
The TOC (transfer of control) button interrupts the system and transfers control from the default...	29
Rear Panel Connectors:power cord	29
Rear Panel Connectors:power cord	29
Rear Panel Connectors:power cord	29
Plug the workstation’s power cord into the power cord connector to provide AC power to the system.	29
Rear Panel Connectors:security loop,	29
Rear Panel Connectors:security loop,	29
Rear Panel Connectors:security loop,	29
The security loop provides a means of locking the left side panel with a padlock or other locking...	29
1. Inspect left side panel for proper seating in the mainframe chassis.	29
1. Inspect left side panel for proper seating in the mainframe chassis.	29
2. Push in the retractable pin on the spring loaded square fastener.	29
2. Push in the retractable pin on the spring loaded square fastener.	29
3. Insert the locking device through the top and bottom holes of the square fastener.	29
3. Insert the locking device through the top and bottom holes of the square fastener.	29
4. Inspect after locking device is in place to assure that the retractable pin is captured in the...	29
4. Inspect after locking device is in place to assure that the retractable pin is captured in the...	29
The internal components of the workstation is now secured. See	29
NOTE A locking device is not supplied with the workstation; the customer must supply a lock to us...	29
NOTE A locking device is not supplied with the workstation; the customer must supply a lock to us...	29
Figure17. Security Loop Operation	30
Figure17. Security Loop Operation	30
<GRAPHIC>	31
Monitor:,	31
Monitor:,	31
The B1000/C3000 workstations support the following monitors:	31
The B1000/C3000 workstations support the following monitors:	31
• 19-inch, 1280¥1024 color monitor (A4575A)	31
• 19-inch, 1280¥1024 color monitor (A4575A)	31
• 19-inch, 1280¥1024 color monitor (A4575A)	31
• 19-inch, 1600¥1200 color monitor (A4575A)	31
• 19-inch, 1600¥1200 color monitor (A4575A)	31
• 21-inch, 1280¥1024 color monitor (A4576A)	31
• 21-inch, 1280¥1024 color monitor (A4576A)	31
• 21-inch, 1600¥1200 color monitor (A4576A)	31
• 21-inch, 1600¥1200 color monitor (A4576A)	31
For information on the A4575A monitors, see:	31
• HP A4575A Color Monitor CE Handbook	31
• HP A4575A Color Monitor CE Handbook	31
• HP A4575A Color Monitor CE Handbook	31
The A4575A is a 19\	31
For information on the A4576A monitor, see:	31
The A4576A is a 21\	31
NOTE Note that the word “multi-sync” is used as a common word to refer to “multi-frequency” and/o...	31
NOTE Note that the word “multi-sync” is used as a common word to refer to “multi-frequency” and/o...	31
NOTE The connection to earlier HP monitors with 15-pin mini-DSub cables can be made using the A41...	31
NOTE The connection to earlier HP monitors with 15-pin mini-DSub cables can be made using the A41...	31
USB:support,	32
USB:support,	32
USB:support,	32
USB Keyboard	32
USB Keyboard	32
The HP Visualize B1000/C3000 workstations support USB keyboards. The keyboard shipped with the wo...	32
The HP Visualize B1000/C3000 workstations support USB keyboards. The keyboard shipped with the wo...	32
The USB keyboard is designed specifically for use with HP workstations. All keyboard models with ...	32
Some applications may expect to use keycodes generated by keys existing on other types of keyboar...	32
NOTE HIL and PS/2 devices are not supported by the B1000/C3000 workstations.	32
NOTE HIL and PS/2 devices are not supported by the B1000/C3000 workstations.	32
USB HP Scroll Mouse	32
USB HP Scroll Mouse	32
The HP scroll mouse (USB) has a left and right button that function the same as most mice. Howeve...	32
The HP scroll mouse (USB) has a left and right button that function the same as most mice. Howeve...	32
For general information on the various cursor shapes associated with different areas of HP CDE wh...	32
HP Hub for USB Devices	32
HP Hub for USB Devices	32
The HP USB hub (part number D6804) provides the ability to connect more than one USB device to th...	32
The HP USB hub (part number D6804) provides the ability to connect more than one USB device to th...	32
Operating System:overview,	33
Operating System:overview,	33
Operating System:overview,	33
The B1000/C3000 workstation uses the HP-UX operating system, version 10.20 and the Workstation Ad...	33
If you’re running HP-UX 11.0, the result from this command will be similar to this:	33
Instant Ignition systems (systems with preloaded software) have X-Windows, Hewlett-Packard’s grap...	33
If the Instant Ignition system does not have the kernel preconfigured with all of the device driv...	33
For problems or questions with Instant Ignition, refer to	33
Note that both of the documents mentioned in the previous paragraphs can be found at the followin...	33
http://www.docs.hp.com/	33
http://www.docs.hp.com/	33
Memory:,	34

Match case Limit results 1 per page

108

Chapter 4

Field Replaceable Units

FRU Removal and Replacement

Installing I/O Cards

To install a new I/O card, do the following:

NOTE

Slots two and four are the graphics card slots. The primary graphics card slot

is slot number two and the secondary graphics card slot is slot number four.

1. Open the left side panel of the system unit as explained in the section “Opening the Left

Side Panel of the System Unit” in this chapter.

Locate the appropriate slot for the I/O card that is to be installed. See Figure 4-12.

3. Unscrew the T-15 Torx screw from the bulkhead blank of the slot you have chosen. If no

blank is present, you may skip to step four.

4. Pull evenly in the direction of the arrow on both sides of the I/O card retainer to remove

it. See Figure 4-13.

5. Insert the I/O card into the slot you have chosen with the bulkhead appropriately

positioned. The ends of the card should be placed in the I/O card guides. Press ﬁrmly

and evenly on the I/O card until it is in the connector. Screw the T-15 Torx screw into

the I/O card’s bulkhead to secure the I/O card.

6. Replace the I/O card retainer by placing the bottom retainer clip in the slot on the air

divider and the clips on the PULL tabs snap into their slots on the upper chassis.

7. Close the left side panel of the system unit by following the procedure in the section

“Closing the Left Side Panel of the System Unit” in this chapter.