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Serial Number

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3-2 Compaq Professional Workstation AP550 Maintenance and Service Guide Serial Number Provide the computer serial number to Compaq whenever you request information or order spare parts. The serial number is located on the top corner of the workstation 1 and on the rear of the chassis 2. For asset control, the serial number is embedded in the EPROM on the system board. If the system board is replaced with a spare part from Compaq, an invalid serial number condition will be reported during Power-On Self-Test (POST). To clear the condition, reenter the original serial number through Computer Setup. NOTE: POST recognizes the serial number as a valid number if a system board from another workstation is installed. 1 2 Figure 3-1. Identifying serial number locations

Section	Page
Compaq Professional Workstation AP550 Maintenance and Service Guide	8
Notice	10
Contents	11
About This Guide	15
Symbols in Text	15
Compaq Technician Notes	16
Where to Go for Additional Help	17
Illustrated Parts Catalog	18
Overview	19
Spare Parts List	21
Service Preliminaries	30
Overview	30
Preliminary Warnings and Cautions	31
Electrostatic Discharge Information	32
Equipment Symbols	32
Tools and Software Requirements	33
Warranty Information	33
Removal and Replacement Procedures	34
Introduction	34
Serial Number	35
Service Preparations	36
Cable Lock	36
Workstation Access Panel	37
Front Bezel	39
Subpanel and Bezel Blanks	40
Mass Storage Devices	42
Installing Optional SCSI Devices	51
Drivelock	54
Expansion Boards	56
Serial Port Cover Connector	60
Card Guide	61
Memory Modules	62
Processor	73
Speaker	79
System Board Fan	80
Power Supply	81
Power Switch	83
System Board	84
I/O Panel	86
Lithium Battery	87
Converting a Minitower to a Desktop Configuration	89
Converting a Desktop to a Minitower Configuration	92
Diagnostic Tools	95
Overview	95
Power-On Self-Test (POST)	96
POST Messages	97
Troubleshooting Minor Problems	103
Computer Setup and Diagnostics Utilities	115
SCSI Error Codes	133
Upgrading the ROM	136
FailSafe Boot Block ROM	137
Fault Management	139
Compaq Insight Manager	140
Compaq Management Agents for Workstations	140
Compaq Restore CD	141
Compaq Diagnostics for Windows NT	142
System Security	143
Security Features	143
Advanced Security Management	150
Jumper and Switch Information	152
Overview	152
Mass Storage	154
Physical and Operating Specifications	157
Overview	157
System Unit	158
375-W Power Supply	164
Diskette Drive	165
Zip Drive	166
CD-ROM Drive	170
DVD-ROM Drive	172
Hard Drives	174
Audio System	177
Keyboard	177
Mouse	178
Graphics Controllers	179
Network Controller	181
External Connectors	182
Overview	182
Physical Location	182
Pin Assignments	184

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3-2

Compaq Professional Workstation AP550 Maintenance and Service Guide

Serial Number

Provide the computer serial number to Compaq whenever you request information or order

spare parts. The serial number is located on the top corner of the workstation

and on the rear

of the chassis

For asset control, the serial number is embedded in the EPROM on the system board. If the

system board is replaced with a spare part from Compaq, an invalid serial number condition will

be reported during Power-On Self-Test (POST). To clear the condition, reenter the original

serial number through Computer Setup.

NOTE:

POST recognizes the serial number as a valid number if a system board from another workstation

is installed.

Figure 3-1.

Identifying serial number locations