Install guide
ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Table 4-19. PS Tasting and Troubleshooting – Continued
Malfunction
Test procedure
Normal indication indication/corrective action
If all voltages are present, replace
sequence monitor circuit card
2j.
2k.
21.
Connect DVM test leads to POWER
SUPPLY +28V and PWR RTN test jacks
Connect DVM test leads to POWER
SUPPLY -28V and PWR RTN test jacks
Connect DVM test leads to POWER
SUPPLY +17V and PWR RTN test jacks
. Connect DVM test leads to POWER
2m.
SUPPLY + INV DR and PWR
-
RTN test
jacks
2n. Connect DVM test leads POWER SUPPLY
+24 AUX and PWR RTN test jacks
20. Set DVM to DC volts and connect DVM
test leads to POWER SUPPLY +24V
UNREG and PWR RTN test jacks
2p. Connect DVM test leads to POWER
SUPPLY AMB PWR HEAT and PWR
RTN test jacks
2q. Connect DVM test leads to POWER
SUPPLY AMB PWR COOL and PWR RTN
test jacks
4-112
DVM indicates +26 to +30V
DVM indicates -26 to -30V
DVM indicates +16.9 to
+17.1V
DVM indicates +12.5 to
+14.OV
DVM indicates +21 to
+24.5V
DVM indicates +21 to
+24.5V
DVM indicates 0 (±0.9) VDC
DVM indicates 0 (±0.9) VDC
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
A3R4
If voltage is out of tolerance, replace
28V converter-regulator circuit card
assembly A3
If voltage is +16 to +18.3V adjust
AR36. Otherwise replace +17V
converter-regulator circuit card
assembly A 1
If voltage is out of tolerance, replace
28V converter-regulator circuit card
assembly A3
Check input power. If voltage is mis-
sing, check continuity from main
relay KI-A2 to 3J5-5
Same as step 2n
Replace +20V converter-regulator cir-
cuit card assembly A2, then sequence
monitor circuit card assembly A5
Same as step 2p