Service manual

COPYRIGHT © 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
13-12
3. Sensor check
Assessment of the status of the photo-interrupter is performed by the SENSOR test
in the TEST MODE. The procedure is as described below.
1) On the control panel, press the Entry/Setting key, then the # key to enter the service
mode.
2) Press the shift keys (up arrow, down arrow) to select TEST MODE.
3) Press 6 on the numeric keypad to select FACULTY TEST.
4) Press 3 on the numeric keypad to enter sensor check mode. The image below will
be displayed.
Figure 13-115
5) When the display shown in Figure13-110 is displayed, push 1,2,3 and 4 on the
numeric keypad. The status of each sensor will be displayed. The following is an
example and explanation of what happens when you push 1 on the numeric keypad.
Figure 13-116
6) Move each sensor’s flag and verify that the display shows of (OFF)/on (ON) repeat-
edly.
The following page shows the display and sensor name, and the status of each sen-
sor when the main unit is in stand-by when keys 1-4 of the numeric keypad are
pressed.
6-3 : SENSOR
[
1
]
---
[
7
]
DS of DES of DOC A4
CRG on DCVS on
Sensor name
Sensor’s present status
Sensor name
Sensor’s present status
DS of means that the automatic document
feeder’s (ADF) document sensor (DS) is off.
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