Introduction; Sensors - NEC NEFAX 671 Service Manual

1.

INTRODUCTION

• This chapter contains the items required or used when troubleshooting various machine
problems.
1-1. Electric Components Check Procedures
• The following procedures can be used to check to see if an electric component is fully
operational when a paper misfeed or a malfunction occurs in this machine.
(1)

Sensors

Step
Does the input signal to the Controller/Mechanical
1 Control Board go from HIGH to LOW, or vice versa,
when the sensor is blocked?
Check
4025T520AA
4025T521AA
T-1
Result Action
NO Replace the sensor.
Replace the Con-
YES troller/Mechanical
Control Board.