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1. Introduction
• Information required for troubleshooting and steps that must be performed are described
in this chapter.
1-1. Checking the electrical components
• If a paper misfeed or malfunction occurs, perform the following operation to check the
condition of the electrical components.
(1) Sensor
(2) Switch
Step Check Result Remedy
1
Does the input signal of the master board change (H→L,
L→H) when the sensor light is interrupted?
NO Replace the sensor.
YES
Replace the master
board.
Step Check Result Remedy
1
Does the input signal (NO) of the master board change from
L to H when the switch is turned on?
NO Replace the switch.
YES
Replace the master
board.
4025T521AA
4025T520AA
4025T523AA
Not Us
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COM
NO