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HP 30310A Power Supply
B-18.
TEST EQUIPMENT COMMON. All measurements and connections to the power supply
must be referenced to the appropriate common circuit. There are four such circuits within the HP
30310A Power Supply: common
W '
common
W '
common
W '
and common
W .
In
subsequent paragraphs, all test and adjustment procedures specify the particular common circuit to
be used.
CAUTION
Do not connect test equipment to power supply chassis ground.
AlL common circuits within the power supply "float" with respect
to chassis ground. Damage to test equipment or power supply
components, and erroneous measurements may result if this
caution is ignored.
B-19.
PREVENTIVE MAINTENANCE
The following preventive maintenance procedures are performed at monthly or semi-monthly
intervals, the frequency depending upon the physical conditions prevailing at a particular site.
Routine maintenance once per month is adequate for most power supplies that operate 24 hours
per day, seven days per week. The interval can be reduced in accordance with the amount of time
the power supply is turned off. The power supply is not removed from the computer to perform
preventive maintenance.
Preventive maintenance for the power supply consists of the following:
a.
Remove dust.
b. Check PCAs for proper seating.
c.
Check cooling fan operation.
d. Check the DC operating voltages at the power supply front panel.
e.
Check the AC voltages for ripple at the PCA cage backplane.
To gain access to the power supplies, open the rear door of the CPU cabinet bay. The power
supplies are hinge-mounted and may be swung-out by removing the screws that attach the left side
of the front panel to the CPU cabinet bay. In this position, the power supply top and bottom covers
can be removed for maintenance and test.
If required, use a vacuum cleaner to remove dust and other light debris from the power supply.
Loosen encrusted dust with a soft-bristled brush, paying particular attention to heat dissipating
areas.
With the top cover of the power supply removed, check all PCAs for proper seating. Adjust where
necessary.
Position the POWER switch to ON and check the cooling fan for proper operation. Ensure that no
object interferes with fan blade rotation.
JAN 1977
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