Missing Colors-Complete Or Partially Missing Color Planes - Lexmark C77x Service Manual

C77/c78 series
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Missing colors—Complete or partially missing color planes
If a color or colors are missing, or a color is partially missing, go to
missing, go to "Black and white only—cyan, magenta, and yellow are missing" on page 2-96." on
page
2-95.
If cyan, magenta, and yellow is missing, go to
missing" on page
2-96.
Step
Actions and questions
1
Print cartridge—Make sure the cartridge is seated
properly and that all packing material has been
removed from the cartridge.
Has all packing material been removed? Is the
cartridge seated correctly?
2
Inspect each of the transfer roll bellcranks.
Were any of the bellcranks broken?
3
Perform the partial print test. See
on page
3-4.
Is the image well-developed on the PC drum but the
same plane is missing or faded on the ITU belt?
4
Turn off the printer. Check the cable connections
between the transfer HVPS board and the system
board.
Does the issue persist?
5
Check continuity on the cable between the respective
rear bellcrank and the lead on the transfer HVPS
board.
Is there continuity?
6
Change or switch failing cartridge.
Does the issue persist?
"Black and white only—cyan, magenta, and yellow are
Yes
Go to step 2
Replace the
broken bell
cranks.
"Partial Print Test"
Go to step 4
Go to step 5
Replace in the
following order:
Go to step 7
"If cyan, magenta, and yellow is
No
Remove
packaging and
seat cartridge.
Go to step 3
Go to step 6
Problem resolved
Replace the
FRUs in the
following order:
1. Transfer
HPVS board.
1. Cable
See
2. FTR spring.
"Transfer
HVPS board
removal" on
page
4-91.
2. Cartridge
contact
assembly.
See
"Cartridge
contact
assembly
removal" on
page
4-35.
3. System
board. See
"System
board
removal" on
page
4-89.
Replace the
cartridge.
Diagnostic information
5061
2-95

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