TM 10-4610-239-24
TM 08580B-24/3
Table 3-1. Direct Support Troubleshooting - Continued
Malfunction
Test or Inspection
Corrective Action
BACKWASH PUMP ASSEMBLY - Continued
2. PUMP ELECTRIC MOTOR FAILS TO START WHEN ELEMENT CLEANING SWITCH IS SET TO START -
Continued
If no motor controller terminal is shorted to ground terminal El, replace motor
controller K2. Refer to paragraph 3-46.
Step 9.
Disconnect backwash pump cable connector P2 from ROWPU. Refer to schematic
diagram figure FO-3. Check for short circuits between P2-D, and P2-A, P2-B, and P2-C.
If no pin is shorted to P2-D, go to step 10.
If any pin is shorted to P2-D, go to step 11.
Step 10.
Remove receptacle connector J2 from electrical junction box. Refer to paragraph 3-37.
Refer to schematic diagram figure FO-3. Check for a short circuit between J2-D and motor
controller K2 terminals T1, T2, and T3.
If any terminal is shorted to J2-D, repair cable W6. Refer to paragraph 3-17.
If no terminal is shorted to J2-D, replace receptacle connector J2. Refer to
Step 11.
Remove backwash pump cable assembly. Refer to paragraph 2-138. Refer to schematic
diagram figure FO-3. Check for short circuits between P2-D and P2-A, P2-B, and P2-C.
If any pin is shorted to P2-D, repair backwash pump cable assembly. Refer to
If no pin is shorted to P2-D, repair backwash pump electric motor. Refer to
Step 12.
Shut down ROWPU. Refer to TM 10-4610-239-10. Shut down power. Refer to generator
manual. Refer to schematic diagram figure FO-3. Check continuity between motor
controller K2 terminals L1, L2, and L3 and receptacle connector J1 pins A, B, and C
respectively.
If all three measurements indicate continuity, repair motor controller K2. Refer
If all three measurements do not indicate continuity, repair wiring harness W5.
Refer to paragraph 3-39.
3-71
