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TM 5-4210-233-14&P-1
4-2. Unit Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM - AERIAL CONTROL PANEL - Continued
20
AERIAL MONITOR/NOZZLE DOES NOT RESPOND TO LOWER CONTROL BOX
(ON AERIAL PANEL)
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 11 of 16.)
Step 1. Check automotive override relay (R7) for proper operation.
Replace relay (see para 4-9.4).
Step 2. Check wires from control box to relay box for continuity.
Replace wire (see para 4-9.4).
Step 3. Check switches for proper operation.
Replace switch (see para 4-203).
Step 4. Check for +12V at aerial circuit breaker #5.
Replace breaker (see para 4-99).
Step 5. Check circuit breaker in relay box for +12V.
Replace breaker (see para 4-99).
Step 6 Refer to "+12 volts not present at aerial master buss" troubleshooting procedure.
21
AERIAL MONITOR/NOZZLE DOES NOT RESPOND IN ONE DIRECTION
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 11 of 16.)
Step 1. Check corresponding relay for proper operation.
Replace relay (see para 4-9.4).
Step 2. Check switch for proper operation.
Replace switch (see para 4-203).
Step 3. Check wiring for continuity.
Replace wire (see para 4-9.4).
4-139
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