TM 11-6625-1831-13
5-3b.
Troubleshooting Test Panel (Cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. Voltage present at POWER J1 jack with INTERLOCK BYPASS off.
Check if K1 is energized electrically. Set multimeter to dc volts. Measure voltage between test jacks J
and E of test fixture No. 1.
A. If +28 Vdc is measured, replace K1 (para 5-6).
B. If 0.0 Vdc is measured, check for short circuit to ground in wiring between K1-E2
and TEST SET TEST J3 jack-pin J. Repair as needed (para 5-14).
5. 200 Vac not present at POWER J1 jack.
Step 1. Check output of K1. Measure voltage between K1-Al to B1, Al to C1 and B1 to C1
A. If every reading is 200 Vac, check for break in wiring between K1-Al and J1-P.
K1-B1 and J1-S, and K1-Ci and J1-T. Repair as necessary (para 5-14).
B. If any reading is not 200 Vac go to step 2.
Step 2.
Check input to K1. Measure voltage between K1 terminals A2 to B2, A2 to C2, and B2 to C2.
Each reading should be 200 Vac.
A. If any reading is not 200 Vac, check for break in wiring from FL1 to K1-A2, FL2 to
K1-B2, or FL3 to K1-C2. Repair as needed (para 5-14).
B. If every reading is 200 Vac, go to step 3.
Step 3.
Check for +28 Vdc from K1 terminals El(+) to E2(-).
A. If reading is +28 Vdc, replace K1 (para 5-6).
B. If reading is 0.0 Vdc, check for break in wiring between +28V at XA3-H and
K1 -El. Also check for break between J3-J to K1-E2. Repair wiring as necessary
6. INTERLOCK FAIL indicator stays on.
Step 1.
Check PUSH TO RESET switch. Set multimeter function to Resistance. Disconnect ac power
Press and hold PUSH TO RESET switch. Check continuity from one switch terminal to the
other.
If reading is not zero ohms, replace switch (para 5-6).
Step 2.
Check Oscillator and Switch Module 1A2 by replacing it.
Install new module (para 5-6).
Step 3.
Check wiring. Test continuity between PUSH TO RESET switch and XA2-X
Repair as necessary (para 5-14).
7. DC voltages not present.
Step 1.
Check Power Supply Regulator Module 1A3 by replacing it.
Install new module (para 5-6).
5-29
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