5-8 Phaser 6121MFP Service Manual
Print-Quality Troubleshooting
Automatic Document Feeder (ADF) Print Quality Problems
The source of print quality problems from the Automatic Document Feeder (ADF)
Unit generally come from two sources:
1. Skewing when copying from the ADF. If skewing occurs when using the ADF,
try using the platen and repeat the copy. If the image is fine from the platen,
but skews from the ADF itself, perform the skew adjustment. See “Skew” on
page 5-31. If this adjustment does not resolve the issue then replace the ADF
Unit (page 8-39).
2. Banding defects that occur as a result of uneven feeding motion. In this
condition, the original page pauses occasionally at uneven intervals. This
causes a banding pattern on the output copy. In this case, clean the feed
rollers and validate the thickness of the original document. Copy media out of
specification from the document glass. If cleaning does not solve the problem,
then replace the ADF Unit (page 8-39).
Blank Copy or Black Copy
The printed copies are either blank or solid black.
Initial Actions
Perform the initial actions listed on page 5-5.
.
Troubleshooting Reference Table
Applicable Parts Example Print
■ Scanner Unit,
PL1.1.6
■ Engine Control
Board, PL13.0.20
■ Image Processor
Board,
PL13.0.29/30
■ Imaging Unit,
PL4.0.13
■ Laser Unit,
PL4.0.2
■ High Voltage
Board, PL13.0.6
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1 Print Test Pattern 3 (see
page 5-7).
Does the defect occur on
the printed output?
Go to step 6. Go to step 2.
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