Checking The Photointerrupters - Canon GP405 Service Manual

5

Checking the Photointerrupters

The photointerrupters may be checked in either of the following two methods:
a. Using a meter.
b. Using service mode (I/O mode).
a. Using a Meter
You cannot insert the meter probe directly into the connectors of the machine's PCBs, as they
are designed specially to enable smooth connection. Obtain a probe extension tool (FY9-3038-000/
FY9-3039-000).
1) Set the digital multimeter range to 12 VDC.
2) Connect the meter probe to GND (0 VDC) of the DC controller PCB.
3) Make a check as indicated. (Use the probe extension and the clip as necessary.)
[ Connection 1 ]
[ Connection 2 ]
b. Using Service Mode
1) Start service mode.
2) Press COPIER>I/O, and select DC-CON.
The bit number notations in the tables that follow represent the following:
ex.P001 00000000
bit7
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Pinch the pin.
Pinch the pin
Figure 14-235
bit0
CHAPTER 14 TROUBLESHOOTING
FY9-2003-000
Probe extension
(FY9-3038)
FY9-2004-000
Clip
Probe extension
Meter
Meter
14-29