Lexmark CS720 Service Manual page 194

Action
Step 7
Reconnect the cable.
Does the problem remain?
Step 8
Check the cable for damage, and replace if necessary.
Does the problem remain?
Step 9
Replace the motor (K developer). See
on page 296.
Does the problem remain?
Step 10
Replace the controller board. See
page 357.
Does the problem remain?
Isolation unit service check
Action
Step 1
Reset the printer.
Does the problem remain?
Step 2
a
Enter the Diagnostics menu, and then navigate to:
Printer diagnostics & adjustments > Motor tests > Isolation
b
Touch Start.
Does the motor run?
Step 3
Manually turn the isolation unit input rollers.
Is there binding or uneven movement when turning the rollers?
Step 4
Replace the isolation unit. See
page 371.
Does the problem remain?
"Motor (EP drive) removal"
"Controller board removal" on
"Isolation unit removal" on
Diagnostic information
194
Yes No
Go to step 8. The problem is
solved.
Go to step 9. The problem is
solved.
Go to step 10. The problem is
solved.
Contact the next The problem is
level of support. solved.
Yes No
Go to step 2. The problem is
solved.
Go to step 3. Go to step 5.
Go to step 4. Go to step 5.
Go to step 5. The problem is
solved.
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