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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
22
AERIAL MONITOR/NOZZLE WILL NOT FUNCTION IN ONE MODE (I.E., RAISE/LOWER)
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 12 of 16.)
Step 1. Check motor brushes for damage/excessive wear.
Replace brushes (see para 5-63).
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)
Step 4. Check both relays for proper operation.
Replace relay(s) (see para 4-9.4).
Step 5. Test motor.
Replace motor (see para 5-63).
23
+12 VOLTS IS NOT PRESENT AT AERIAL MASTER BUSS
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 3 of 16.)
Step 1. Check aerial master solenoid.
Replace solenoid (see para 4-9.4).
Step 2. Check aerial master switch.
Replace switch (see para 4-179).
Step 3. Check wiring for continuity.
Replace switch (see para 4-9.4).
4-140
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