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
2x. Set COMP PS switch to OFF
2y. Set REFERENCE AMB TEMP V LAMP
switch to O V
22. Set FUNCTION switch to COMP PS +15V
PREC
2aa.
2ab.
2ac.
2ad.
2ae.
2af.
2ag.
2ah.
2ai.
2aj.
2ak.
2al.
2am.
2an.
2ao.
Set COMP PS switch to ON
Connect DVM test leads to COMP PWR
SPLY PREC + 15V and PWR RTN test
jacks
Set COMP PS switch to OFF
Set FUNCTION switch to COMP PS
-15V PREC
Set COMP PS switch to ON
Connect DVM test leads to COMP PWR
SPLY PREC -1 5V and PWR RTN test
jacks
Set COMP PS switch to OFF
Set FUNCTION switch to COMP PS +5V
Set COMP PS switch to ON
Connect DVM t est leads to COMP PWR
SPLY +5V and PWR RTN test jacks
Disconnect DVM from PSTS
Set COMP PS switch to OFF
Set MODE switch to NO LOAD
Connect oscilloscope to POR* and
PWR RTN test jacks
Adjust oscilloscope vertical sensitivity
to 2 volts/division and center trace, then
set to DC coupling
COMP PS ON indicator goes
off
COMP PS ON indicator lights
DVM indicates +14.8 to
If the voltage is out of tolerance,
+15.2V
replace 5V power supply circuit card
assembly A1
COMP PS ON indicator goes
off
COMP PS ON indicator lights
DVM indicates -14.7 to
If the voltage is out of tolerance,
-15.3V replace 5V power supply circuit card
assembly A1
COMP PS ON indicator goes
off
COMP PS ON indicator lights
DVM indicates +4.8 to +5.2V
If the voltage is out of tolerance,
replace 5V power supply circuit card
assembly A1
COMP PS ON indicator goes
off
4-129