Lexmark CS720 Service Manual page 38

Action
Step 5
•
If the affected color is cyan, magenta, or yellow, then replace
the developer unit of the affected color.
•
If the affected color is black, then replace the imaging unit.
Does the problem remain?
Step 6
a
Remove the imaging kit.
b
Enter the Diagnostics menu, and then navigate to:
Printer diagnostics & adjustments > Motor tests
c
Select the developer unit motor of the affected color, and then
touch Start.
Does the motor run?
Step 7
Replace the motor. See "Motor (EP drive) removal" on page
296.
Does the problem remain?
Step 8
a
Manually turn the motor.
b
While turning the motor, check if the couplers that drive the
imaging kit move.
Do the couplers move?
Step 9
Replace the EP gear box. See
page 302.
Does the problem remain?
Step 10
Check if the pins on the HVPS freely move.
Do the pins freely move?
Step 11
Replace the HVPS. See "HVPS removal" on page
Does the problem remain?
Step 12
Check the continuity of the cable on the JSC1 connector on the
controller board.
Does the cable have continuity?
"EP gear box removal" on
319.
Diagnostic information
38
Yes No
Go to step 6. The problem is
solved.
Go to step 8. Go to step 7.
Go to step 8. The problem is
solved.
Go to step 10. Go to step 9.
Go to step 10. The problem is
solved.
Go to step 12. Go to step 11.
Go to step 12. The problem is
solved.
Go to step 14. Go to step 13.
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