Install guide

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Set BATTERY and VEHICLE circuit breakers
CB1 and CB2 to ON.
If short is removed, replace battery charger
circuit card assembly A7.
Set BATTERY and VEHICLE circuit breakers
CB1 and CB2 to OFF.
Set PSTS INPUT POWER UUT circuit
breaker to OFF.
Set INPUT POWER PSTS circuit breaker to
OFF.
Set 0 to + 40V input power source to off.
Reinstall battery charger circuit card assembly
A7.
Set PSTS INPUT POWER PSTS circuit
breaker to ON.
Set INPUT POWER UUT circuit breaker to
ON.
Set 0 to + 40V input power source to on.
Set BATTERY circuit breaker CB1 to ON.
If short is present, set BATTERY circuit
breaker CB1 to OFF.
Set PSTS INPUT POWER UUT circuit
breaker to OFF.
Set INPUT POWER PSTS circuit breaker to
OFF.
Set 0 to + 40V input power source to off.
Check diode CR3 anode to ground for short.
If short exists, check diode CR3 anode termi-
nal lug and insulator for damage. Repair or
replace as necessary.
If diode CR3 mode is not shorted, set BAT-
TERY circuit breaker CB1 to ON and check
BATTERY circuit breaker CB1-3 to ground
for short.
If short is not present, replace BATTERY
circuit breaker CB1.
Set PSTS INPUT POWER PSTS circuit
breaker to ON.
Set INPUT POWER UUT circuit breaker to
ON.
Set 0 to + 40V input power source to on.
Check diode CR3 anode to ground for + 5V.
If + 5V is not present, check BATTERY cir-
cuit breaker CB1-1 to ground for + 5V.
If + 5V is not present, replace BATTERY
circuit breaker CB1.
Set BATTERY circuit breaker CB1 to OFF.
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ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Set VEHICLE circuit breaker to CB2 to ON.
If short is present,
set VEHICLE circuit
breaker CB2 to OFF and check diode CB2
anode to ground for a short.
If short is present, check diode CR2 anode
terminal lug and insulator for damage. Repair
or replace as necessary.
Set VEHICLE circuit breaker CB2 to ON and
check VEHICLE circuit breaker CB2-3 to
ground for a short.
If short is not present, replace VEHICLE
circuit breaker CB2.
Check diode CR2 anode to ground for + 5V.
If + 5V is not present, check VEHICLE cir-
cuit breaker CB2-1 to ground for + 5V.
If + 5V still is not present, redate VEHICLE
.
circuit breaker CB21
NOTE
If subroutine 1 is done for step 2h of
table 4-19, voltage indications will be
approximately +24 volts.
e. PS Troubleshooting Subroutine No. 2 – Bus
Power Short and Continuity Checks. This subroutine
checks that the DC input power can be applied to the
circuits when main relay K1 is turned on: ‘Before it is
closed, only the battery charger and sequence monitor is
active. When K1 closes, some of the + 24V power is
sent directly to connector 3J5-6 for use by the system
computer. Most of the remaining current flows to the
input filter board, In the switching regulator section of
the chassis, this current is then divided to the three
regulators. The most probable failures are shorted tran-
sistors and shorted capacitors. These are found by
removing assembles. Perform subroutine no. 2 as fol-
lows:
(1)
(2)
(3)
(4)
(5)
Set BATTERY circuit breaker CB1 to OFF.
Check that standoff terminal El is shorted to
standoff terminal E2. Standoff terminal E2.
Standoff terminals El and E2 are located on
filter circuit card assembly A4 where terminal
lugs are connected.
Pull filter circuit card assembly A4 away from
intercomection assembly by loosening wedge-
locks and heat sink captive screws.
If short between standoff terminals El and E2
is removed, reinstall filter circuit card assem-
bly A4.
If short between standoff terminals El and E2
remains, replace filter circuit card assembly
A4.
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