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Service Guide ML390/391
Chapter 4 Failure & Repair Analysis
RAP 04: Line Feed Problems
NOTE:
Before performing this RAP, check the following.
1. Is the head gap correctly set for the type of paper being used?
2. Remove the printhead. Examine the pins. Do they appear damaged? If so, replace the printhead.
START
Manually rotate the platen knob. Does it rotate smoothly?
YES Go to A.
NO Set the release lever to OPEN. Manually rotate the platen knob. Does it rotate smoothly?
NO Go to A.
YES Check the following in the order given below. Check the operation of the platen knob before moving
between steps.
1. Check the paper feed path setting.
2. Clean the platen gear, idle gear, and drive gear.
3. Verify that the platen gear, idle gear, and drive gear are correctly meshing.
4. Verify that the left and right push tractor assemblies are correctly installed.
5. Verify that the left and right push tractor assemblies are correctly operating. Replace if necessary.
Is the problem resolved?
YES End of procedure.
NO Go to A.
A
Are the connection plate and the line feed motor making correct contact?
YES Is the connection plate making correct contact with the control board?
YES Replace the control board.
Is the problem resolved?
YES End of procedure.
NO Replace the line feed motor.
Is the problem resolved?
YES End of procedure.
NO Contact Technical Support.
NO Replace the line feed motor.
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