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4026-0XX
Spot or Marks At Same Spot On Every Print
Note: Do not expose the photoconductor to light any longer than
necessary when you remove the photoconductor unit from the
printer.
FRU
1
Photoconduc-
tor Unit
Assembly
2
Fuser Paper
Separators
Blank Page
FRU
1
Toner Car-
tridge
2
Printhead
Printhead
3
Assembly
All Black Page
Note: Incorrect laser exposure or incorrect charging of the photo-
conductor causes an all black page.
FRU
1
Right Side
Frame Termi-
nals
Action
Remove the photoconductor unit assembly and
check the photoconductor for voids, spots, or
damage.
If black spots are observed approximately 70
mm apart, check the fuser paper separators for
toner buildup. Clean or replace as necessary.
Action
Remove the toner cartridge and gently shake
the assembly to evenly distribute the toner.
Be sure the printhead actuator in the top cover
actuates the printhead switch in the printhead
assembly.
Blank pages can be caused by a defective print-
head assembly or engine board. If the toner car-
tridge is operating correctly, replace the
printhead assembly. If this does not correct the
problem, replace the engine board.
Action
Check for a bent, broken, contaminated, or pit-
ted drum charge bias terminal or drum ground
terminal located on the right side frame.
Replace as necessary.
Diagnostic Information 2-39
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