HP 3000 III Series Manual page 379

System Installation
the HP 30312A panel lights to indicate "overcurrent".
(3) Release toggle switch S2 and check that the overcurrent
LED goes out and a 5V LED 1 ight s.
d. Open the rear door of equiment Bay No.1, remove the screw(s)
at the left edge of the'HP 30310A Power Supply (figure 9-1)
and swing that Power Supply out of the bay~
e. At the top of the HP 30310A Power Supply, turn R12 fully
clockwise.
f. Connect the digital voltmeter between the +5VDC connector
(BNC type) center conductor and a COM terminal lug on the
back plane of the CPU card cage.
Note
Do not connect the digital voltmeter com-
mon lead to chassis ground. Failure to
comply will produce erroneous and possible
destructive results.
g. Use a small tip screwdriver to reach through the top of ,the
HP 30310A Power ,Supply to ad just AlRl unt il the d igi tal vol t-
meter displays +5.17 volts.
h. Leave the digital voltmeter common lead where it is, but move
input lead to the +15, -5, and -15 test jacks on the HP
30310A rear panel. The voltmeter should display a value be-
tween 14.2 and 16.7 for either the +15 or -15 test jacks, and
between 4.4 and 5.7 for the -5 test jack.
i. Move the voltmeter input lead to the +20 test jack on the lIP
30310A panel. Then, use a small tip screwdriver to reach
through the top of the HP 30310A Powe r Supply to se t A3R2
fully clockwise and leave at this setting. The voltmeter
should display a val ue be tween 16.8 and 18.0 vol ts.
j. Move the voltmeter input lead to the -20 test jack. The same
value (but opposite polarity) noted in step i should be dis-
played.
k. Repeat steps d through j for each HP 30310A Power SUpply in
the sys tern.
1. Move the voltmeter to the front of the equipment bays.
m. Connect the voltmeter common or return lead to the cammon
symbol jack on the fr ont panel of the HP 30311A Power Supply
in the CPU Bay (figure 9-1).
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