Lexmark C935 Service Manual page 237

Step
4 Check the appropriate toner add assembly chute for
clogging.
Is the chute, located at the lower part of the above
component, free of clogs and obstructions?
5 Check the appropriate segment of the CMYK toner add
motor assembly for operation.
Caution: When performing motor tests,
ensure that all cover and door interlock
switches are overridden.
Warning: Only perform this test in segments of three
seconds or less or toner spill will occur.
1. Enter the Diagnostics Menu.
2. Select MOTOR TESTS.
3. Select Printer Motor Test.
4. Select C, M, Y or K toner add motor.
Does the above component operate properly?
6 Check the CMYK toner add motor assembly connection.
Is the above component properly connected?
7 Perform a POR.
Does the error remain when the power is turned off/on
again?
Check Yes
Go to step 5. Clean any
obstructions.
Go to step 7. Go to step 6.
Replace the Replace the
CMYK toner add connection.
motor assembly.
Go to "CMYK
toner add motor
assembly
removal" on
page 4-103.
Replace the upper Problem solved.
printer engine card
assembly.
Go to "Upper
printer engine
card assembly
removal" on
page 4-90.
Diagnostic information
5057-XXX
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