Doosan B20S-3, Specifications Systems Operation Testing & Adjusting, Page: 72 / 123

71 MicroController Control System Troubleshooting
PROBLEM 18
Display = “E1” lift truck operation normal.
POSSIBLE CAUSE
Worn brushes; Short wiring; Display defect.
CHECKS
Disconnect the respective wire from the motor.
Wire #31 for drive motor or wire #72 for pump motor.
Connect the battery and close the key switch and
seat switch.
Does the LCD go out ?
No Yes
Disconnect the battery. Check continuity of
the respective wires to the controller.
Continuity No continuity
Replace logics.
Check continuity from Batt.+ on controller
to wire#31 and wire#72 or PE-6 (wire #73).
Shorted Opened
Repair or replace wires.
Check the brushes and replace
as necessary.
Repair wires.