ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Table 4-19. PS Tasting and Troubleshooting Continued
Malfunction
Normal indication
indication/corrective action
Test procedure
If all voltages are present, replace
sequence monitor circuit card
assembly AS
If +14 or 28V is missing, replace 28V
converter-regulator circuit card
assembly A3
If +17V is missing, replace +17V
converter-regulator circuit card
assembly A 1 and/or power inverter
assembly A6
If 400-Hz sine wave is missing, replace
power inverter assembly A6
If unit does not stay on for 0.5 second
or more, perform subroutines 1,2,3
and 4. If no faults are found, replace
sequence monitor circuit card assem-
bly A5
If voltage is out of tolerance, adjust
2j. Connect DVM test leads to POWER
DVM indicates +26 to +30V
A3R4
SUPPLY +28V and PWR RTN test jacks
If voltage is out of tolerance, replace
DVM indicates -26 to -30V
2k. Connect DVM test leads to POWER
SUPPLY -28V and PWR RTN test jacks
28V converter-regulator circuit card
assembly A3
If voltage is +16 to +18.3V adjust
21. Connect DVM test leads to POWER
DVM indicates +16.9 to
+17.1V
SUPPLY +17V and PWR RTN test jacks
AR36. Otherwise replace +17V
converter-regulator circuit card
assembly A 1
2m. Connect DVM test leads to POWER
DVM indicates +12.5 to
If voltage is out of tolerance, replace
SUPPLY + INV DR and PWR-RTN test
+14.OV
28V converter-regulator circuit card
jacks
assembly A3
2n. Connect DVM test leads POWER SUPPLY
Check input power. If voltage is mis-
DVM indicates +21 to
+24 AUX and PWR RTN test jacks
sing, check continuity from main
+24.5V
relay KI-A2 to 3J5-5
20. Set DVM to DC volts and connect DVM
DVM indicates +21 to
Same as step 2n
+24.5V
test leads to POWER SUPPLY +24V
UNREG and PWR RTN test jacks
2p. Connect DVM test leads to POWER
DVM indicates 0 (0.9) VDC
Replace +20V converter-regulator cir-
SUPPLY AMB PWR HEAT and PWR
cuit card assembly A2, then sequence
RTN test jacks
monitor circuit card assembly A5
2q. Connect DVM test leads to POWER
DVM indicates 0 (0.9) VDC
Same as step 2p
SUPPLY AMB PWR COOL and PWR RTN
test jacks
4-112
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