Lexmark C950 - Page 284

2-236 Service Manual
5058-030
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3
Check the four PC cartridges for spots or other damage
on the drum surfaces.
Are the PC cartridges free of excess wear and
contamination?
Go to step 4. Replace the
appropriate PC
cartridge or
connector.
4
Print the print quality page suite.
Do the spots repeat for a given color?
Replace the
appropriate
printhead. Go to
“LED printhead
removal” on
page 4-96.
Go to step 5.
5
Check the heat belt and pressure roll in the fuser
assembly for scratches or defects.
CAUTION: The fuser assembly might be hot.
Allow the fuser assembly to cool.
Remove the fuser assembly.
Is there contamination or cracks on the heat belt
and/or pressure roll?
Replace the
fuser assembly.
Go to “Fuser
assembly
removal” on
page 4-78.
Go to step 6.
6
Check the 2nd transfer roller for contamination and wear.
Is the 2nd transfer roller free of excess wear and
contamination?
Go to step 7. Replace the 2nd
transfer roller.
Go to “2nd
transfer roller
removal” on
page 4-24.
7
Replace the transfer belt assembly. Go to “Transfer belt
assembly removal” on page 4-168.
Does the problem remain?
Go to step 8. Problem
resolved
8
Check the LED printhead.
Replace the LED printhead.
Go to “LED printhead removal” on page 4-96.
Does the problem remain?
Go to step 9. Problem
resolved
9
Check the upper printer engine PCBA for proper
connectivity. Disconnect and reconnect all appropriate
cables.
Replace the upper printer engine PCBA.
Go to “Upper printer engine PCBA removal” on
page 4-181.
Perform a print test. Go to “PRINT TESTS” on
page 3-22.
Does the problem remain?
Replace the RIP
PCBA.
Go to “RIP
PCBA removal”
on page 4-144.
Problem
resolved
Step Check Yes No