ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Table 4-20. Computer Power Supply Testing and Troubleshooting Continued
Malfunction
Normal indication
Test procedure
indication/corrective action
Set COMP PS switch to ON
Oscillsocope trace rises to +3
If the voltage is out of tolerance,
to +6V when switch is set
replace 15V power supply circuit card
and then drops to 0 to 0.5
assembly A2
VDC after 0.5 to 1.5
seconds and remains at this
level
Connect the oscilloscope to OFF and
OFF signal should be +3 to
Replace 15V power supply circuit card
PWR RTN test jacks. Turn COMP PS
+6 VDC
assembly A2 if off signal is not +3
switch to OFF
to +6 VDC
Turn COMP PS switch to ON
Off signal should be 0 to
Replace 15V power supply circuit card
0.5 VDc
assembly A2 if off signal is not 0
to 0.5 VDC
Turn COMP PS switch to OFF
Set INPUT POWER UUT circuit breaker
to OFF
Press POWER SUPPLY TEST SET ON
Switch-indicator light goes
switch-indicator
off
Set INPUT POWER PSTS circuit breaker
to OFF
Disconnect computer power supply from
PSTS
NOTE
Before turning off 0-40V power
supply, adjust to 0 volts.
Disconnect all test equipment
TEST COMPLETED
4-130
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