Page: 88
Service Guide ML390/391
Chapter 4 Failure & Repair Analysis
RAP 02: Abnormal Spacing
START
Check the movement (Steps A and B) of the carriage assembly.
A
Does the assembly vibrate back and forth in the same location or does it move sharply to the left or right
end of the carriage shaft?
YES Replace the control board.
Is the problem resolved?
YES End of procedure.
NO Go to the next step listed below.
NO Clean the contacts between the carriage cable and the space motor contacts.
Is the problem resolved?
YES End of procedure.
NO Go to B.
B
Is the carriage assembly jammed?
YES Clean the teeth of the space motor and the space rack.
Is the problem resolved?
YES End of procedure.
NO Go to C
NO Go to C
C
Are + 5 vdc and + 40 vdc being supplied to the control board?
+ 5 vdc Voltage is read between Pin 6 and Pin 9 of CN2 on the power supply board.
+ 40 vdc Voltage is read between Pin 1 and Pin 5 of CN2 on the power supply board.
YES Replace the control board.
YES End of procedure.
NO Go to D
NO Go to D
D
Are the power supply board and the control board connected properly?
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