TM 11-6625-1831-13
5-3B.
Troubleshooting Test Panel (Cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
29. Open circuit through BITE TEST switch.
Step 1.
Check switch S8 for open circuit. Push and hold BITE TEST switch. Test continuity from S8-1
to S8-3.
Replace switch if defective (para 5-6).
Step 2.
Check wiring. Test for open circuit from +20 volt line XA3-E to S8-1. Test for open circuit from
S8-3 to SIGNAL J2 jack J2-n.
Repair wiring (para 5-14).
30. Indicators fail to turn off.
Replace circuit breaker CB1.
Install new circuit breaker (para 5-6).
31. High resistance through RESIDUE potentiometer R2.
Step 1.
Check wiring. Test for open circuit from terminal CW of R2 to SIGNAL J2 jack J2-Y. Test for
open circuit from R2-CCW to J2-Z.
Repair wiring (para 5-14).
Step 2.
Replace potentiometer R2.
Install new potentiometer (para 5-6).
32. Low resistance through RESIDUE potentiometer R2.
Replace potentiometer R2.
Install new potentiometer (para 5-6).
33. Wrong voltage at DRIFT TEST potentiometer R1.
Step 1.
Adjust potentiometer iTB1-R11.
See para 5-12 for instructions.
Step 2.
Replace DRIFT TEST potentiometer R1.
Install new potentiometer (para 5-6), then adjust 1TB1-R11 (para. 5-12).
Step 3.
Check 1TB1-R10 and R11. See schematic of 1TB1 for pin numbers and values. Replace
defective components (para 5-5).
34. Open circuit from test panel jack to test fixture No. 2.
Check wiring. Test for open circuit from test panel jack to SIGNAL PROCESSOR POWER J1 jack (see
schematic for pin numbers).
Repair wiring (para 5-14).
35. Open circuit from test panel jack to test fixture No. 3.
Check wiring. Test for open circuit from test panel jack to SIGNAL PROCESSOR SIGNAL J2 jack (see
schematic for pin numbers).
Repair wiring (para 5-14).
5-34
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