TroubleshootingService Manual 7-77.2.8 Defective Motor Operation7.2.9 No Power7.2.10 Printed Vertical Lines Become CurvedDescription: The main motor is faulty and paper does not feed into the printer, resulting in a Jam0.Possible Cause Sequence of Repair Actions1. The main motor harness or motor board may be faulty.2. The main board may be faulty.a. Check motor operation.b. Replace the motor or harness if faulty.c. Replace the main board.Description: When the printer is powered ON the LEDs on the control panel do not come on.Possible Cause Sequence of Repair Actions1. The SMPS or power input are faulty.2. Control panel doesn’t come on, but other normal start-upsounds are heard.3. After replacing the SMPS, the lamps do not come on andno start up sounds are heard.a. Replace the power supply cable.b. Check the power fuse on the SMPS, replacethe SMPS if necessary.c. Check the control panel wiring. Replace theharness or control panel if faulty.d. Replace the main board.Description: When printing the vertical lines are not straight.Possible Cause Sequence of Repair Actions1. The +24 V supply to the laser unit is faulty. a. Use the DCU test 05 to test the laser motor.b. If the voltage is stable, replace the laserunit.c. If the voltage is not 24 volts, replace theSMPS.d. Replace the main board.
