Install guide

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