Lexmark C77X, Service Manual

Page: 141 / 480

Diagnostic information
2-97
5061
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 “Black and white only—cyan, magenta, and yellow are missing” on page 2-98.” on
page 2-97
.
•
If cyan, magenta, and yellow is missing, go to “Black and white only—cyan, magenta, and yellow are
missing” on page 2-98 .
Step Actions and questions Yes No
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?
Go to step 2 Remove
packaging and
seat cartridge.
2 Inspect each of the transfer roll bellcranks.
Were any of the bellcranks broken?
Replace the
broken bell
cranks. Go to step 3
3 Perform the partial print test. See “Partial Print Test”
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?
Go to step 4 Go to step 6
4 Turn off the printer. Check the cable connections
between the transfer HVPS board and the system
board.
Does the issue persist?
Go to step 5 Problem resolved
5 Check continuity on the cable between the respective
rear bellcrank and the lead on the transfer HVPS
board.
Is there continuity?
Replace in the
following order:
1. Transfer
HPVS board.
See
“Transfer
HVPS board
removal” on
page 4-92
.
2. Cartridge
contact
assembly.
See
“Cartridge
contact
assembly
removal” on
page 4-35
.
3. System
board. See
“System
board
removal” on
page 4-90
.
Replace the
FRUs in the
following order:
1. Cable
2. FTR spring.
6 Change or switch failing cartridge.
Does the issue persist?
Go to step 7 Replace the
cartridge.