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Service Guide ML320/ML321
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?
