86
MicroController Control System Troubleshooting
PROBLEM 31
Display = “F3”, no lift truck operation.
POSSIBLE CAUSE
Pump fuse open.
Shorted MOSFET TP in Pump Module.;
Open the pump motor cable (P1, P2) during the operation.
Open the armature coil or the field coil in pump motor
during operation.
Logics defect.
CHECKS
Check the pump fuse open.
Ye s No
Remove the pump controller from frame
and replace the pump controller.
Replace the pump fuse.
Replace the armature AS or field AS.
Repair or replace
the cables.
Measure the resistance between
P1 and P2 terminals on pump motor.
0 ohm Opened
Check the continuity of P1, P2 cables.
Continuity No continuity
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