Driving Wheel System 119Service Manual – SC3000
Troubleshooting
Trouble Possible Causes Remedy
The machine does not move The battery voltage is too low Charge the battery
The drive pedal potentiometer (RV1) is misadjusted or
broken
Replace the pedal
The function electronic board (EB1) is faulty Replace
The wiring harness is damaged Check all connections inside the
electrical component compartment,
included those of the function
electronic board
The drive system motor (M3) carbon brushes are worn Replace
The drive system motor (M3) is faulty Replace
The driver's seat microswitch (SW1) is faulty Repair/replace
There is an open in the function electronic board fuse
(F2)
Replace
The function electronic board (EB1) is faulty See the Electrical System chapter
The brake does not operate The electromagnetic brake deactivation lever (BRK) is
turned to unlock position
Remove the shim
The electromagnetic brake braking masses (BRK) are not
efcient
Replace the electromagnetic brake
The brake does not activate when
pressing the forward/reverse gear pedal
There is an open in wiring harness between function
electronic board and electromagnetic brake
Check/repair the wiring harness/
electrical connections
The electromagnetic brake (BRK) is faulty Replace
The function electronic board (EB1) is faulty Replace
The antiskid LED blinks, and speed is
reduced also when travelling in a straight
line on level ground
Electronic function board (EB1) installed in incorrect
position
Install the electronic board with the
long side parallel to the ground
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