Canon FY8-13FW-000DADF-A1 Service Manual page 135

CHAPTER 5 TROUBLESHOOTING
LED
LED1
LED2
Table 5-401 LEDs on the DADF
Controller PCB
Test pin No.
TP1-1 Output of the original tray paper sensor
-2 Output of the registration sensor
-3 For factory
-4 For factory
-5 +5V
-6 GND
Table 5-402 Test Pins on the DADF
Controller PCB
5-28
COPYRIGHT © 1998 CANON INC.
Description
Use it when checking
the output of the origi
nal tray paper sensor.
Use it when checking
the output of the regi
stration sensor.
Checks
CANON DADF-A1 REV.0 DEC. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
• Checking the Output of the Original Tray
Paper Sensor/Registration Sensor
If you have replaced the DADF controller
PCB, original tray paper sensor, or registration
sensor in the field, you must make sure that the
output of each sensor is correct. (The light-
emitting unit and the light-receiving unit of
these sensors are not of a single entity.)
Making Checks
1) Turn off the copier's power switch.
2) Shift bit 4 of the DIP switch DSW on
the DADF controller PCB to on.
1
1 2
J15
CB1
7
J1
1
8
J10
1
DSW1
SW1
SW3
6
SW2
Figure 5-402
3) Turn on the copier's power switch.
4) With no original on the original tray, press
the push switch SW3 on the DADF
controller PCB once.
5) Check to make sure that LED1/LED2 on
the DADF controller PCB turn on, and the
voltage of TP2-1/TP2-2 is 1.1±0.1 V.
If the voltage of either TP2-1 or TP2-2 is
not as indicated, suspect displacement of
the light-emitting/-receiving unit of the
sensor corresponding to the probe of the
meter. Check the position of the sensor.
4 1 2 1 10
1 9
J5
13
J8
J2 J3 J14
1
1
J13
2
1
3
1
2
1
B12 B1
1
3
2 1
TP1 J12
A1 J9 A12
14
2
J6
J7
J11