Background Contamination - Xerox Phaser 7400 Service Manual

Background Contamination

There is a very light covering of toner across the entire page. Background
contamination can appear in one of the primary colors or gray. The printer displays no
error code.
Note
Depending on the type of paper and environmental conditions, some light amount
of random background spotting is normal. The whiter and glossier the paper, the
more noticeable it will be.
Initial Actions:
Ensure the TekColor correction is not set to None in the printer's dialog box.
Ask the customer about their typical printing habits. A high daily duty cycle
can temporarily fatigue the OPC drums within the Imaging Unit and
contribute to unwanted background toner.
Troubleshooting Reference Table
Applicable Parts
Imaging Unit
Fuser
Transfer Unit
HVPS
Engine Control Board
Troubleshooting Procedure Table
Step Actions and Questions
1 Is the printer in direct sun light?
2 Does the background appear to be in
only one of the primary colors?
Print-Quality Troubleshooting
Example Print
Yes
Move the printer.
Go to Step 3.
s7400-324
No
Go to Step 2.
Go to Step 4.
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