Horizontal banding check
Actions Yes No
Step 1
Measure the distance between repeating bands.
Is the distance between bands either 34.6 or 94.2 mm?
Replace the
photoconductor unit.
Remove the imaging
unit and remove the
original developer
units, and then put
them back into the new
photoconductor unit,
and reinstall the
imaging unit. See
“Imaging unit (IU)
removal” on page
267.
Go to step 2.
Step 2
Does the distance measure 95 mm or 108 mm?
Replace the fuser. See
“Fuser assembly
removal” on page
287.
Go to step 3.
Step 3
Does the distance measure 37.7, 55, or 78.5 mm?
Replace the ITU. See
Image transfer unit
(ITU).
Go to step 4.
Step 4
Does the distance measure 43.9 mm or 45.5?
Replace the developers
that match the missing
color (black, cyan,
magenta, or yellow.)
See Developer unit
removal.
Check the various
rollers in the printer for
debris.
Horizontal line check
Either the photoconductor unit or one of the developer units that make up the imaging unit is defective. Remove and
inspect the imaging unit. Replace the damaged part of the imaging unit. See Imaging unit (IU) removal.
Missing image at edge check
Remove and reset the following:
• Toner cartridge
• Imaging unit
• Developer units
7527
Diagnostic information
43
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