Oki Microline 520 Service Handbook page 236

RAP 03 Printhead Homing Error
START
Printhead does not return to the home position.
Make sure the carriage cable is properly connected to the space motor assembly and CN8 on the
main control board.
Make sure the power connector cable is properly connected to CN3 on the main control board.
Does the space motor assembly move manually?
No Remove the space motor assembly and inspect the space motor and space rack for dirt
and worn teeth.
Go to A
Yes Are there any breaks in the carriage cable?
Yes Replace the carriage cable assembly.
Go to A
No Verify that ribbon feed mechanism is properly fastened to the space motor
assembly.
Go to A
Failure Analysis 4 - 28 Microline 520/521 Service Handbook
P/N 59257803