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Phaser 8400/8500/8550/8560 Color Printer Service Manual 4-69
General Troubleshooting
Paper-Pick Errors - Tray 1
1. Verify the media being used is the correct size and weight.
2. Clean the Tray 1 pick roller and separator pad, refer to the cleaning
procedure.
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 will
home and pick paper. Remove all media, open and close Tray 1 and then
try printing again.
Preheater and Transfix Jams
1. Remove the preheater and check for and remove any small paper scraps
that may be present.
2. Check for excessive media skews.
3. Check for ink shards on top of the preheater next to the flag (see
page 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 of
paper 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-operating
sensor flags.
8. Check the stripper solenoid is functioning properly by running the stripper
solenoid test and the stripper contact test, replace if necessary.
9. Check the stripper blade for damage, replace the stripper carriage if
necessary.
10. Check for ink shards on top of the preheater next to the flag (see
page 8-20).
Checking the Process and Media Path Drive
1. Determine if the process motor runs. If it does not rotate, go to Step 2. If it
does rotate, go to Step 4.
2. Measure to determine if +50 VDC is being supplied to the motor. If power
is applied, go to Step 3. If it is not, inspect the process motor's wiring
harness. If the harness is functional, then troubleshoot the Electronics
Module. 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 the
motor's windings. If the windings are opened, shorted or far out of
tolerance, replace the motor.
4. Ensure the process drive gearbox is in it’s proper home position, refer to
page 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.