ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Table 4-19. PS Testing and Troubleshooting Continued
Malfunction
Test procedure
Normal indication
indication/corrective action
2ad. Press POWER SUPPLY OFF switch, set
Multimeter indicates 100
Use oscilloscope to determine if
+17.0V remains on. If it does not,
FUNCTION switch to 115
press
to 121 VAC
replace +17V, converter-regulator
POWER SUPPLY ON switch, and con-
circuit card assembly A 1. If the +17
nect multimeter to 115V
and PWR
RTN test jacks
is present, replace power inverter
assembly A6
2ae. Disconnect multirneter from PSTS
2af. Press POWER SUPPLY OFF switch, set
FUNCTION switch to PS AMB PWR
2ag. Set REFERENCE switch to AMB TEMP
+8V
2ah. Set DVM to DC volts. Press POWER
SUPPLY ON switch
2ai. Connect DVM test leads to POWER
DVM indicates +16.0 to
If the voltage is out of tolerance or the
+18.8V
SUPPLY AMB PWR HEAT and PWR
PS shuts off, replace +20V converter-
RTN test jacks
regulator circuit card assembly A2,
then sequence monitor circuit card
assembly AS, then K3
2aj. Press POWER SUPPLY OFF switch and
set REFERENCE switch to AMB TEMP
V LAMP-5 VDC
2ak. Press POWER SUPPLY ON switch
2a1. Comect DVM test leads to POWER
DVM indicates +10.0 to
If the voltage is out of tolerance or the
SUPPLY AMB PWR COOL and PWR RTN +11.8V
PS shuts off, replace sequence moni-
test jack
tor circuit card assembly AS, then
+20V converter-regulator circuit card
assembly A2
2am. Press POWER SUPPLY OFF switch
2an. Set REFERENCE switch AMB TEMP
+8 VDC
2ao. Press POWER SUPPLY ON switch
2ap. Connect DVM test leads to POWER
DVM indicates +25 to +29V
Voltage out of tolerance: Replace
SUPPLY HTR 1 and PWR RTN test jacks
sequence monitor circuit card
assembly AS, then K2
2aq. Connect DVM meter test leads to
DVM indicates +24 to +28V
Voltage out of tolerance: Replace K2
POWER SUPPLY HTR 2 and PWR RTN
test jacks
4-114
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