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Service Guide ML520/521
Chapter 4 Failure & Repair Analysis
RAP 08 Line Feed Problem
START
No line feed operation.
Make sure that the line feed cable is properly connected to the line feed motor and CN5 of the main
control board.
Power OFF the printer. Manually rotate the platen.
Does the platen rotate smoothly?
Yes Go to A
No Is the left platen gear broken?
Yes Replace the platen assembly.
End of procedure.
No Is the line feed idle gear broken?
Yes Replace the line feed motor assembly or the line feed idle gear.
End of procedure.
No Are the right platen gear, idle gear and/or change gear broken?
Yes Replace the respective assembly.
End of procedure.
No Set the change lever to the rear position.
Does the platen rotate smoothly?
Yes Replace the tractor feed assembly.
End of procedure.
No Check the gears on the tractor feed assembly and platen assembly for broken or missing teeth.
Replace the defective assembly.
Go to A
A
Replace the line feed motor assembly.
Has the problem been resolved?
Yes End of procedure.
No Replace the main control board.
Has the problem been resolved?
Yes End of procedure.
No Contact Technical Support.
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