Table 4-2. Unit Troubleshooting-continued -706880269

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