Checking The Photointerrupters - Canon NP7160 Service Manual

4. Checking the Photointerrupters

The copier allows you to use its service mode when checking its photointerrupters. (You may
also use a conventional meter.)
a. Using a Meter
1) Put the copier in standby state.
2) Set the range of the meter to 30 VDC.
3) Connect the - probe of the meter to J105-5 (GND) of the DC controller PCB.
4) Connect the + probe of the meter to the appropriate terminal on the DC controller PCB
indicated in the tables that follow.
5) Make checks as instructed.
b. Using Service Mode
1) Press the User Mode key.
2) Press '2' and '8' of the keypad at the same time. (Hold them down for 0.5 sec or more.)
3) Press the User Mode key once again.
• The copier starts service mode, and indicates '1' on the copy count indicator.
4) Press '2' and then the AE in sequence.
• The copier starts I/O DISPLAY mode, and indicates '201'.
5) Enter the appropriate service mode No. indicated in the tables that follow, and press the Start
key.
6) Make checks as instructed.
• Refer to the state of the copy count indicator LEDs. (Tables use '1' to indicate ON, and '0'
to indicate OFF.)
COPYRIGHT © 1998 CANON INC.
2d
Figure 10-228
CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
2a 1a
2b 1f
1g
2c 1e
1d
1b
1c
10–23