Canon NP6251 Service Manual page 586

6. Checking the Photointerrupters
You can check the machine's photointerrupters either with a conventional meter or
the machine's service mode.
a. Using a Tester
1) Set the meter to the 30VDC range.
2) Connect the – probe of the meter to GND on the DC controller PCB.
3) Connect the + probe to the terminals (DC controller PCB) shown in the table.
4) Make checks as instructed.
b. Using Service Mode
1) Open the front door, and insert the door switch actuator into the door switch
assembly.
2) Press the service switch with a clip over the cover.
3) Press , , and
2
4) Using the keypad on the control panel, enter the address of each photointerrupter;
then, check the reading.
Caution:
The machine's motors may start to operate when you turn on or off the sensors;
exercise extra caution.
COPYRIGHT © 1997 CANON INC.
in sequence on the control panel.
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
11-55