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4026-0XX
Diagnostic Information 2-15
Service Checks
Charge Brush Service Check
Note: The charge brush charges the photoconductor and is located
inside the photoconductor unit.
FRU Action
1
Photoconduc-
tor Unit
Spots and marks can be caused by a defective
charge brush inside the
photoconductor unit.
If there are any spots or marks, especially ones
that appear in the same spot on the printed
page, replace the
photoconductor unit.
Check the
photoconductor unit for a damaged
charge brush contact.
2
Main Drive
Motor Gears
Be sure the main drive motor and gears are
operating correctly and turning the charge
brush.
3
ChargeBrush
Bias Contact
(right side
frame)
Check the charge brush bias contact located on
the right side frame for damage, corrosion, wear
or pitting. Intermittent failure of the charge brush
contact can cause an all black page, horizontal
black bars or lines. If any of these are found,
replace the charge brush bias contact.
4
Photoconduc-
tor Unit
Ground Con-
tact
Check the photoconductor unit ground contact
on the right side frame for damage. Intermittent
failure of the photoconductorunit ground contact
can cause print quality problems such as an all
black page, horizontal black bars or lines. If any
of these are found, replace the photoconductor
unit ground contact.
5
HVPS board Unplug the machine and check the HVPS for
correct mounting, pitted or discolored contacts.
If the HVPS is damaged, replace as necessary.
If no problems are found replace the photocon-
ductor unit assembly.