Missing Colors-Complete Or Partially Missing Color Planes - Lexmark C750 Service Manual

Missing colors—Complete or partially missing color planes
•
If a color or colors are missing, or a color is partially missing, go to
•
If cyan, magenta, and yellow is missing, go to
missing" on page 2-142.
Step Action 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 3-5.
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.
Do you continue to have the same problem?
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.
Do you continue to have the same problem?
7 Cartridge contact assembly - Check the cartridge
contact block. Make sure the PC drum contact pin is
not stuck. See "Cartridge contact assembly
removal" on page 4-23
contact pin.
Does the pin operate correctly?
"Black and white only—cyan, magenta, and yellow are
"Partial Print Test"
to identify the PC drum
"Step A" on page 2-143.
Yes No
Go to step 2 Remove packaging
and seat cartridge
Replace the broken Go to step 3
bell cranks.
Go to step 4 Go to step 6
Go to step 5 Problem resolved
Replace in the Replace the FRUs
following order: in the following
order:
1. "Transfer
HVPS board 1. Cable
removal" on
2. FTR spring.
page 4-80
2. "Cartridge
contact
assembly
removal" on
page 4-23
3. "Engine board
removal" on
page 4-29.
Go to step 7 Replace the
cartridge.
Go to step 8 Replace the
"Cartridge
contact assembly
removal" on
page
Diagnostic information
5060-00x
4-23.
2-141