ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Table 4-19. PS Testing and Troubleshooting Continued
Malfunction
indication/corrective action
Normal indication
Test procedure
BATTERY indicator lights: Replace
BATTERY indicator goes
2bt. Adjust 0 to +40V external power source
sequence monitor circuit card
off
to +28, then to +24 (0.5)V. Measure
assembly A5
power supply voltage at POWER
SUPPLY PWR IN and PWR RTN test
jacks
BATTERY indicator dots not light:
BATTERY indicator lights
2bu. Set PS VEHICLE circuit breaker CB2 to
Replace sequence monitor circuit card
off
assembly A5
If shutdown occurs, replace sequence
BATTERY indicator goes
2bv. Set PS VEHICLE circuit breaker CB2
monitor circuit card assembly A5. If
off
to on
shutdown prevails, replace diode CR3
Voltage out of tolerance: Check R4.
DVM indicates +22 to
2bw. Press POWER SUPPLY OFF switch.
+25V
Replace sequence monitor circuit
Set MODE switch to BATT SIM 1A.
card assembly A5, then battery
Set POWER SUPPLY INTERLOCK
charger circuit card assembly A7
switch to OFF. Connect DVM test
leads to POWER SUPPLY BATT and
PWR RTN test jacks
If voltage is within tolerance but
DVM indicates +26.9 to
2bx. Set POWER SUPPLY INTERLOCK
+29.1V. CHARGE indi-
CHARGE indicator stays on, replace
switch to ON (wait approximately 14
cator flashes on then
sequence monitor circuit card
seconds)
assembly A5
remains off
If voltage is out of tolerance, replace
sequence monitor circuit card
assembly A5, then battery charger
circuit card assembly A7
If voltage is within tolerance but
DVM indicates +26.9 to
2by. Set MODE switch to BATT SIM 4A
+29.1V CHARGE indicator
CHARGE indicator does not light,
replace sequence monitor circuit card
lights
assembly A5
If voltage is out of tolerance, replace
battery charger circuit card assembly
A7, then sequence monitor circuit
card assembly A5
2bz. Connect DVM test leads to POWER
SUPPLY PWR IN and PWR RTN test
jacks
Same as step 2by
DVM indicates +24 to +25V
2ca. Slowly decrease +28V power source
until CHARGE indicator goes off
If CHARGE indicator does not light,
CHARGE indicator lights
2cb. Set POWER SUPPLY VEHICLE SENSE
replace sequence monitor circuit card
switch to OFF. Increase external +28V
assembly A5, then battery charger
power source to +28V
circuit card assembly A7
4-117
Change 5
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