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Caution
I
To ensure that the computer remains free of dust, you must clean the air
filter periodically. Inspect it as often as your computer environment dic-
tates, and clean it as soon as the first signs of dirt appear. Failure to keep
the filter clean can result in permanent damage to the computer.
Troubleshooting
System malfunctions can be isolated to the assembly level by performing the following tests:
1.
Power supply check.
2.
Self-tests.
3.
Diagnostics.
When a test procedure indicates a faulty component, you can usually correct the problem by
replacing the assembly in which the indicated faulty component is located. Mter identifying the
problem, contact your nearest Hewlett-Packard Sales and Service Office for instructions regarding
obtaining a new assembly and returning the faulty one. Assembly removal and replacement
procedures are given in this chapter.
Power Supply Check
Warning
G
To avoid damage to equipment or injury to people, any service,
adjustments, or repair to the power supply must be performed
only by qualified maintenance people.
Before working on the power supply, you must set the computer's ac Power Switch (LINE switch)
to OFF and disconnect the ac power cord. Before working on the system, turn off the power at
the system Main Switch, on the rear door of the cabinet, and disconnect the ac power cord. If the
computer or system is equipped with battery backup, set the Battery Enable switch to DISABLE.
To verify power supply operation, use a voltmeter to verify that the signal values at the rear panel
test connector (near the Battery Enable switch) are the same as those listed in Table 3-1. The
MLT - signal is generated by battery backup and may not be within tolerance if battery backup is
not installed.
3-2
Service
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