Canon DADF-G1, Руководство по обслуживанию

Страница: 131 / 154

COPYRIGHT© 2000 CANON INC. CANON DADF-G1 REV.0 OCT. 2000
CHAPTER 5 TROUBLESHOOTING
5-22
2.1.5 E411 Indicator
Original tray paper sensor (S1), Registration sensor (S3)
1) Connect the probes of the digital multimeter to the following con-
nectors on the DADF controller PCB. Is the reading 2.3 V or less
when nothing blocks the sensor?
YES: Go to step 2.
NO:
Replace the DADF controller PCB.
(+) (-)
Original tray J5-7 J5-8
sensor (S1)
Registration
J9-20 J9-21
sensor (S3)
S1,S3
2) Is the light-receiving segment of each sensor soiled with paper lint
or the like?
YES: Clean the light-receiving segment of the sensor with a cotton swab,
and go to step 3.
LED1, LED2 (for sensor)
3) Connect the probes of the digital multimeter to the following con-
nectors of the DADF controller PCB. Is the reading about 0.6 to 1.1
V?
NO: Check the wiring from the LED to the DADF controller PCB; if
normal, replace the LED.
(+) (-)
LED1 J5-7 J5-8
LED2 J9-20 J9-21
Sensor (output level)
4) After steps 2 and 3, check the output by performing the instruc-
tions in step 1. Is the reading of the digital multimeter 1.2 V or less?
NO: Adjust the position of the sensor.
Sensor
5) Is the problem corrected after step 4?
YES: End.
NO:
Replace the sensor.