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Maintenance Procedures
1.
Allow at least 15 minutes warm-up time, preferably with the CPU in the RUN state (RUN lamp
lit).
2.
Check the control panel at the top front of the full length door on the CPU bay. If the RUN lamp is
lit, press the top of the RUN/HALT switch to turn-off the RUN lamp.
3. Behind the front door of equipment bays, look for the small panel of an HP 30312A Power Supply.
For each HP 30312A Power Supply in the system, perform these steps:
a.
Set the ADJ R32 potentiometer fully clockwise.
b.
Press and hold toggle switch S2 and turn ADJ R32 counterclockwise until the LED in the
upper-right corner of the HP 30312A panel lights to indicate Hover-current".
c.
Release toggle switch S2 and check that the over-current LED goes out and a 5V LED lights.
4.
Open the rear door of equipment bay number 1, remove the screw(s) at the left edge of the HP
30310A Power Supply and swing that Power Supply out of the bay.
5.
At the top of the HP 30310A Power Supply, turn R12 fully clockwise.
6.
Connect the digital voltmeter between the
+
5VDC connector (BNC type) center conductor and a
COM terminal lug on the backplane of the CPU card cage.
NOTE
DO NOT connect the digital voltmeter common lead to chassis
ground. Failure to heed this note will produce erroneous and
possibly destructive results.
7.
Use a small tip screwdriver to reach through the top of the HP 30310A Power Supply to adjust
A1R1 until the digital voltmeter displays
+
5.17 volts.
8. Leave the digital voltmeter common lead where it is now but move input lead to the
+
15, - 5, and
- 15 test jacks on the HP 30310A rear panel. The voltmeter should display a value between 14.7
and 16.5 for either the + 15 or -15 test jacks, and between 4.5 and 5.3 for the - 5 test jack.
9.
Move the voltmeter input lead to the +20 test jack on the HP 30310A panel, then use a small tip
screwdriver to reach through the top of the HP 30310A Power Supply to set A3R2 fully clockwise
and leave at this setting. The voltmeter should display a value between 16.9 and 17.7 volts.
10. Move the voltmeter input lead to the - 20 test jack; the same value (but opposite polarity) noted in
step 9 should be displayed.
11. Repeat steps 4 through 10 for each HP 30310A Power Supply in the system.
12. Move the voltmeter to the front of the equipment bays.
13. Connect the voltmeter common or return lead to the common symbol jack on the front panel
of the HP 30311A Power Supply in the CPU bay.
JAN
1977
4-3
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