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Phaser 8400/8500/8550/8560 Color Printer Service Manual 5-23
Print-Quality Troubleshooting
Vertical Lines Appear Wavy
Straight vertical lines appear to be wavy and ill-formed. This problem is likely
caused by too much oil on the Drum.
Initial Actions
■ Check the media used is supported by this printer.
■ Check that the paper path is clean and clear of debris.
Troubleshooting Reference
Applicable Parts Example Print
■ Drum Temperature Sensor
■ X-Axis Motor
■ Y-Axis Encoder
■ Drum Maintenance Pivot Plate
■ Drum Maintenance Camshaft
Wavy Vertical Lines Troubleshooting Procedure
Step Questions and Actions
Yes No
1 Check and clean the Drum Maintenance Kit
wiper blade. Replace the kit if necessary.
Did this correct the problem?
Complete. Go to Step 2.
2 Check X-Axis motion and verify there is
nothing interfering such as a poorly dressed
cable or screw. Replace any defective parts.
Did this correct the problem?
Complete. Go to Step 3.
3 Test the Y-Axis Encoder.
1. Run the Service Diagnostics Y-Axis
Encoder test.
Is the Y-axis encoder working properly?
Go to Step 4. Clean the
Drum encoder
or replace the
Drum
Assembly.
s8500-041