TM 5-5420-280-10
0038 00
Pallet Electrical Troubleshooting (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
17. RCU WILL NOT LOWER SECONDARY BOOM (L13-H)
Step 1. Check that KY1 and KY15 hydraulic control valve solenoid LED
lights are lit when action button 1 is depressed.
If lights are lit on control valve solenoids, notify field maintenance.
Step 2. Check to see if one or no lights are lit when action button 1 is
depressed.
If light is out, notify field maintenance.
END OF TESTING
18. RCU WILL NOT LOCK LAUNCH BOOM INTO COUPLING POSITION (L14-A and
L15-A)
Step 1. Check that KY1, KY17, and KY23 hydraulic control valve solenoid
LED lights are lit when action button 1 is depressed.
If all lights are lit on control valve solenoids, notify field
maintenance.
Step 2. Check to see if only one or no lights are lit when action button 1 is
depressed.
If light is out, notify field maintenance.
END OF TESTING
19. RCU WILL NOT LOWER LAUNCH BOOM (L15-A)
Step 1. Check that KY1 and KY16 hydraulic control valve solenoid LED
lights are lit when action button 1 is depressed.
If both lights are lit on control valve solenoids, notify field
maintenance.
Step 2. Check to see if one or more control valve solenoid LED lights are out
when action button 1 is depressed.
If light is out, notify field maintenance.
END OF TESTING
