INTRODUCTION
This lesson covers operator-level troubleshooting procedures, if a malfunction occurs on the M157
Smoke Generator System. This is most essential to ensure the success of your mission.
PART A -- PERFORM OPERATOR-LEVEL TROUBLESHOOTING PROCEDURES
WHEN CIRCUIT BREAKER CB1 MOVES TO THE OFF POSITION
1.
Malfunctions may occur during operation of the M157 Smoke Generator System that require the
smoke generator operator to determine as closely as possible the nature of the problem. The operator
accomplishes this determination by applying troubleshooting procedures. Troubleshooting procedures
are a logical set of steps that serve to isolate and identify a malfunction.
2.
The first malfunction discussed is that which occurs when circuit breaker CB1 moves back to the
OFF position after it is placed in the ON position. Correct the malfunction by following these
procedures.
Step 1.
Start the vehicle engine if it is not already running.
Step 2.
Check for a short circuit in the air compressor assembly.
a. Disconnect the cable assembly from connector 2J1 at the air compressor (Figure 4-1).
b. Set circuit breaker CB1 to the ON position.
(1) If circuit breaker CB1 stays in the ON position, the air compressor assembly has a short
circuit. Set CB1 to OFF; then reconnect the cable. Notify organizational maintenance.
(2) If circuit breaker CB1 moves to the OFF position, the malfunction is not in the air
compressor assembly. Reconnect the cable and go to the next step.
Step 3.
Check for a short circuit in the air compressor cable.
a. Disconnect the cable assembly from connector 1J2 at the control panel assembly (Figure 4-
2).
CM3305
4-2
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