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TI MicroLaser Plus laser printer reports 'Main Motor Err'

"I have a Texas Instruments Microlaser Plus laser printer which after I turn it on, reports that the self-test passed but then displays an error on the LCD: 'Main Motor Err'.

This laser printer uses the Sharp JX9500 engine and I was able to find out how to get it into diagnostics mode. I selected "Test Print" and it returned "Service (C2) 01". The stepper motor appeared to be working correctly along with the fuser lamp."

(From: All Laser Service (laser@ix.netcom.com).)

The lubricant used on the gear train tends to gum up and the motor strains to the point that you receive a main motor error. Take the complete gear train apart and clean it. You will need to disassemble all the gears and clean both the gears and the axles. Also take a look at the developer and drum cartridges as they are driven by this gear train. If they are jammed this will also cause your problem.