Service Manual: SC750, SC800, SC 750 ST, SC800 ST
Form Number 56043150 Page 124
Troubleshooting
Does Not Propel Forward or Reverse
Possible Causes
• Baery voltage too low
• Controller not receiving input requests for travel
• Drive motor
• Drive motor controller
• Wiring
If the drive system is not funconal but the rest of the machine control panel operates, use the Service Test Mode to
speed your diagnosis. Check to see if the Drive Motor Controller is sending signals to the Main Machine Controller that
indicate it is trying to move the machine. If it is, that conrms that the input requests to the Drive Motor Controller are
good and that it is trying to respond to them. Next, check to see if there is voltage across the motor terminals. If the
voltage is above 6 volts and the motor is not turning, the motor is the problem (Check the carbon brushes). If there is no
voltage to the motor, the controller or wiring has failed.
To Next Page
Loading...
Need help?
General
