5-14 Phaser 6300/6350/6360 Color Laser Printer Service Manual
Print-Quality Troubleshooting
3 Test the Toner Motor and Auger
system.
1. Run the Service Diagnostics
Toner Motor test for the affected
color.
2. Vacuum out the Auger Tube
from both ends, reinstall, and
and run the Toner Motor to refill
the Auger Tube.
3. Check that the shutter at the end
of the Auger Tube operates
correctly.
Does the problem persist?
Go to Step 4. Complete
4 Inspect the Developer Bias spring
of the affected color. Compare it to
the other colors. Check for
contamination or damage.
Go to Step 5. Replace the Housing
Assembly Bias
(page 8-78).
5 Check for any obstructions or
debris in the laser beam path
between the Laser Unit and the
Imaging Unit.
Remove
obstructions or
debris.
Go to Step 6.
6 Warning: Turn printer power Off
and disconnect the AC
power cord before
proceeding with the
following checks.
Check the affected colors
connection between the HVPS and
Housing Assembly Bias for
continuity and damage.
JP101/102 <=>DA Y contact
JP103/104 <=>DB M contact
JP105/106 <=>DC C contact
JP107/108 <=>DD K contact
Go to Step 7. Replace the Housing
Assembly Bias
(page 8-78).
7 Check the Developer Assembly
gear train, PL8.1.1. Symptoms can
be all colors, only one color, and
only CMY color. IF CMY color only
is bad (black is good), this is most
likely the root cause.
Does the image quality improve?
Complete Go to Step 8.
8 Replace the affected color’s
Developer Assembly.
Does the image quality improve?
Complete Go to Step 9.
9 Replace the Laser Unit
(
page 8-77).
Does the image quality improve?
Complete Replace the Engine
Control Board
(page 8-106).
Troubleshooting Procedure Table (Continued)
Step Actions and Questions Yes No
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