ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
(i)
(19) Set INPUT POWER UUT circuit breaker to
Set PSTS INPUT POWER UUT circuit
breaker to OFF.
ON.
(20) Set 0 to + 40V input power source to on,
(j) Set INPUT POWER PSTS circuit breaker
to OFF.
(21) Set BATTERY and VEHICLE circuit breakers
(k) Set 0 to + 40V input power source to off,
CB1 and CB2 to ON.
(1) Replace sequence monitor circuit card as-
(22) Check for + 12V at sequence monitor circuit
card assembly AS connector P2-1.
sembly A5.
(m) If + 12V is not present, replace battery
(23) If + 12V is present, perform the following
charger circuit card assembly A7.
steps:
(n) Reconnect connector A5T2 to sequence
(a) Set BATTERY and VEHICLE circuit break-
monitor circuit card assembly A5.
ers CB1 and CB2 to OFF.
(b) Set PSTS INPUT POWER UUT circuit
breaker to OFF.
bleshooting.
(c) Set INPUT POWER PSTS circuit breaker
to OFF.
a. Test Equipment and Materials.
(d) Set 0 to + 40V input power source to off.
(1) Power supply test set (PSTS)
(e) Replace 28V converter-regulator circuit
(2) Digital Voltmeter AN/GSM-46B
card assembly A3.
(3) Multimeter AN/USM-223
(24) If + 12V is not present, perform the following
(4) Oscilloscope AN/USM-281A or AN/USM-273
steps:
b. Procedure.
(a) Reinstall 28V converter-regulator circuit
card assembly A3.
NOTE
(b) Disconnect connector A5 J2 from sequence
When card Al, A2, or A3 is removed
monitor circuit card assembly A5.
during the troubleshooting process, be
sure to note the serial number of the
(c) Set PSTS INPUT POWER PSTS circuit
original card so it will not be confused
breaker to ON.
with any new replacements and installed
(d) Set INPUT POWER UUT circuit breaker
inadvertently,
to ON.
Perform computer PS testing and troubleshooting in
(e) Set 0 to + 40V input power source to on,
accordance with table 4-20, Figure 4-12 contains the
test setup interconnection diagram. See figure 4-13 for
(f) Set BATTERY and VEHICLE circuit break-
circuit card adjustment locations, See figure 4-15 to
ers CB1 and CB2 to ON,
locate circuit cards in the computer power supply.
(g) Check for + 12V at sequence monitor cir-
After a repair action has been taken, the complete test
cuit card assembly A5 connector P2-1.
(part 2 of table 4-20) should be performed. In any test
where more than one circuit card has been replaced,
(h) If + 12V is present, set BATTERY and VE-
circuit cards other than the last circuit card changed
HICLE circuit breakers CB1 and CB2 to
shall be replaced and the step repeated.
OFF.
4-123
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