Lexmark C746n Service Manual page 167

Step Questions / actions
Check the high voltage contact from the
4
HVPS to the photoconductor charge roll.
Ensure the contact springs are properly
mounted and that the charge roll contact
spring is making good contact with the HVPS
spring that runs through the left printer frame
to view the proper mounting and for removal
procedures.
High voltage
power supply
High voltage
contact path
Are the spring(s) defective?
Turn off the printer and check the continuity of
5
the HVPS cable.
Pin 24
Pin 2
Is there continuity?
Replace the HVPS. See
6
power supply (HVPS) removal" on
page 4-115.
Did this fix the problem?
Replace the printhead. See
7
removal, installation, and adjustment" on
page 4-145.
Did this fix the problem?
Replace the transfer
contact assembly.
Go to step 6.
Pin 1
Pin 23
Pin 2
Pin 1
Problem solved.
"High-voltage
Problem solved.
"Printhead
Yes
Go to step 5.
Replace the cable
assembly.
Pin 23
Pin 24
Go to step 7.
Replace the system board.
See
removal" on page
Diagnostic information
5026
No
"System board
4-155.
2-131
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