Phaser 8400/8500/8550/8560 Color Printer Service Manual 4-69General TroubleshootingPaper-Pick Errors - Tray 11. Verify the media being used is the correct size and weight.2. Clean the Tray 1 pick roller and separator pad, refer to the cleaningprocedure.3. Ensure the printer is operating under the right environmental conditions,see Chapter One for more information.4. Run the Tray 1 Pick Solenoid test, replace if necessary.5. When Tray 1 is opened or closed with media present the pick roller willhome and pick paper. Remove all media, open and close Tray 1 and thentry printing again.Preheater and Transfix Jams1. Remove the preheater and check for and remove any small paper scrapsthat may be present.2. Check for excessive media skews.3. Check for ink shards on top of the preheater next to the flag (seepage 8-20).4. Using diagnostics, run the media drive path test. If the test fails,replace the preheater assembly.5. Check the paper-eject path for obstructions. Ensure no small pieces ofpaper are trapped around the paper release blade.6. Ensure that the transfix roller is rotating freely, replace if necessary.7. Test the sensors in the paper path. Look for damaged or non-operatingsensor flags.8. Check the stripper solenoid is functioning properly by running the strippersolenoid test and the stripper contact test, replace if necessary.9. Check the stripper blade for damage, replace the stripper carriage ifnecessary.10. Check for ink shards on top of the preheater next to the flag (seepage 8-20).Checking the Process and Media Path Drive1. Determine if the process motor runs. If it does not rotate, go to Step 2. If itdoes rotate, go to Step 4.2. Measure to determine if +50 VDC is being supplied to the motor. If poweris applied, go to Step 3. If it is not, inspect the process motor's wiringharness. If the harness is functional, then troubleshoot the ElectronicsModule. Refer back to the topic, “Measuring AC Power Supply Voltages”on page 4-64.3. Disconnect the motor's wiring harness. Measure the resistance of themotor's windings. If the windings are opened, shorted or far out oftolerance, replace the motor.4. Ensure the process drive gearbox is in it’s proper home position, refer topage page 6-8.5. Run the paper path drive test.6. Run the drum maintenance drive test.7. Run the transfix fast and transfix slow.8. Run the process motor and media drive motor tests.
