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TM 55-4920-412-13&P
Table 4-33. Troubleshooting Processors Selection-Analog AB/DIGITAL AB, Wiring Verification Fail Warn Lamp, Test
Freq, ANA-DIG (B C D Counter Board A5)
Trouble
Probable Cause
Remedy
Fail Warn Lamp does not light
Lamp Test Board. Regulator Board
Replace defective components or re-
(A4). B C D (A5).
place boards (A4) and (A5). See
figs. 4-14, 4-18, FO-6, FO-8, FO-11.
Test Frequency Lamps ANA-DIG
Test Frequency Switch (S1). Regula-
Replace defective components or re-
do not light
tor Board (A4). B C D (A5). Lamp
place boards (A4) and (A5). See
Test Board.
figs. 4-14, 4-18, FO-6, FO-8, FO-11.
Wiring verification check voltage
B C D Board (A5)
Replace defective components or re-
low or missing.
place board (A5). See figs. 4-18,
FO-6, FO-11.
B C D Counter circuit defective.
Inter Cal Select switch (S6). Regula-
Replace defective components or
tor Board (A4). Oscillator Board (A6)
boards (A4), (A5), (A6). See
B C D Board (A5).
figs. 4-14, 4-16, 4-18, FO-6, FO-8, FO-10,
FO-11.
Select A Digital PROC, Select A
Regulator Board (A4). B C D Board
Replace defective components or
Analog PROC, Select B Digital
(A5).
boards (A4), (A5). See Figs. 4-14, 4-18,
PROC, and Select B Analog PROC
FO-8, FO-11.
does not light
Reset Pulse Input missing output.
Inter Cal Select Switch (S6). OSC
Replace defective components or re-
Board (A6). Analog Monitor Board
place boards (A6), (A10). See
No. 2 (A10).
figs. 4-16, 4-21, FO-6, FO-10, FO-13.
Reset Pulse
Switch (S6), Oscillator Board (A6),
Replace components or replace
Analog Monitor Board (A10).
boards (A6), (A10). See figs. FO-6,
FO-10, FO-13, 4-16, 4-21.
Input 5v, 10v missing.
B C D Board (A5), Regulator Board
Replace components or boards (A4,
(A4).
A5). See fig. FO-8, FO-11, 4-14, 4-18
4-61
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