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TM 5-4210-233-14&P-1
Table 4-2.
Unit Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM-CAB CONTROLS AND INDICATORS-Continued
8
MECHANICAL SIREN DOES NOT OPERATE-Continued
Step 3.
Check footswitch for proper operation.
Replace switch (see para 4-9.4).
Step 4.
Check for +12V at emergency master buss.
Refer to "+12 volts not present at emergency master buss" troubleshooting procedure.
Step 5.
Check for +12V at emergency master circuit breaker #2.
Replace breaker (see para 4-99).
Step 6.
Check wiring for continuity.
Replace wire (see para 4-9.4).
9
MECHANICAL SIREN BRAKE DOES NOT OPERATE
(See Electrical Wiring Diagrams, Appendix H, Sheet 1 of 16.)
Step 1.
Check brake solenoid for proper operation.
Replace solenoid (see para 4-9.4).
Step 2.
Check siren brake switch.
Replace switch (see para 4-9.4).
Step 3.
Check for +12V at siren brake relay (wire 1633) when siren is off.
Replace relay (see para 4-9.4).
Step 4.
Check wiring for continuity.
Replace wire (see para 4-9.4)
4-81
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