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System Service
Before making voltage checks, the voltmeter must be allowed time to warm up as prescribed by the
manufacturer of the instrument. Also, the computer must run, with any type of program, for at
least 15 minutes before making the voltage measurement.
Make the voltage checks as described below:
a.
Stop the computer program.
b. Measure the six DC voltages listed in table B-2. These voltages are available for cursory
measurement only at test jacks mounted on the power supply front panel... (See figure B-6.)
c. Set the oscilloscope for reading AC voltage. On the PCA cage backplane, check each of the six
voltages listed in table B-2 for ripple. For each voltage, the indicated ripple should be less than
that listed in table B-2.
If any voltage is not within specified limits, make the necessary adjustments as described in
paragraphs B-20 through B-23.
Table B-2. DC Output Voltages for the HP 30310A
VOLTAGE
MINIMUM
MAXIMUM
RIPPLE VOLTAGE
TEST POINT
READING
READING
TOLERANCE
+20
(See paragraph
8-22)
+15
+14.7
+16.5
0.4
volt peak-to-peak
+5
Set at
+5.17
0.3
volt peak-to-peak
-5
-4.5
-5.3
0.3
volt peak-to-peak
-15
-14.7
-16.5
0.4
volt peak-to-peak
-20
(See paragraph
8-22)
B-20.
HP 30310A ADJUSTMENTS
Three adjustments should be made to the power supply after it is installed in the computer. These
adjustments are accessible through the top cover of the power supply.
B-21.
PREREGULATOR ADJUSTMENT. The +15, +5, -15 volt supply outputs are controlled by
preregulator adjustment resistor AIRI (+5, +15V ADJ) on the preregulator control PCA. If one or
more of these voltages are not within tolerance when the voltage check is made, the preregulator
should be adjusted as described in the following paragraphs.
a. Set the power supply POWER switch to the ON position.
b. Connect the voltmeter between the center conductor of the +5VDC connector and COM ort the
PCA cage backplane. While observing the voltmeter, adjust the +5, +15V ADJ resistor (AIRl)
until the +5 volt output is 5.17 volts as specified in table B-2.
B-18
JAN 1977
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