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TM 55-4920-412-13&P
Table 4-6. Troubleshooting Power Supply Circuit (AVIM) - Cont.
Trouble
Probable Cause
Remedy
-15 vdc
CR3, R7, CR5
Replace defective components,
vdc reading out of tolerance
C9, C10
Figures 4-4, 4-5, FO-1, FO-5 or re-
place A1 board.
37 vdc
CR4, CR6, C3, R8
Replace defective components,
vdc reading out of tolerance
C6, C13
Figures 4-4, 4-5, FO-1, FO-5 or re-
place A1 board.
-37 vdc
CR3, R7, CR5
Replace defective components,
vdc reading out of tolerance
C9, C10
Figures 4-4, 4-5, FO-1, FO-5 or re-
place A-1 board.
12 vdc NO 1 and NO 2 vdc reading
R19
Adjust (R18) or (R19) if defective
out of tolerance
R18
use decade resistor box check or re-
place, Figures 4-4, 4-5, FO-1, FO-5
12 vdc NO 1 and NO 2
NO 1 - Q2, U3, CR7, CR10
Replace defective components,
vdc reading out of tolerance after
NO 2 - Q1, U4, CR7, CR10
figures 4-4, 4-5, FO-1, FO-5 or
trim resistors (R19) or (R18)
replace A1 board.
(R19) or (R18) checked or replaced.
12 vdc NO 1 and NO 2
NO 1 - C14, C29, U3, C21, C19,
Replace defective components,
no vdc or shows excessive reading
C25, R10
Figures 4-4, 4-5, FO-1, FO-5 or
after trim resistors checked or
NO 2 - U4, C28, C20, C18, C24,
replace A1 board.
replaced
C20, R9 -
-12 vdc
R20
Adjust (R20) if defective use
vdc reading out of tolerance
decade resistor box and check or re-
place, Figures 4-4, 4-5, FO-1, FO-5
or replace A1 board.
-12 vdc
U5, CR8, CR9
Replace defective components,
vdc reading out of tolerance after
Figures 4-4, 4-5, FO-1, FO-5 or
trim resistor (R20) checks or
replace A1 board.
replaced
-12 vdc
C26, R23, C27, C25, C22, C23,
Replace defective components,
no vdc reading out or shows
U5, R11
Figures 4-4, 4-5, FO-1, FO-5 or
excessive reading after trim resistor
replace A1 board.
checked
4-9
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