Canon NP6251 Service Manual page 575

CHAPTER 11 TROUBLESHOOTING
Method 1
1) Turn off the power switch.
2) Short J127-1 and -2 on the DC controller PCB, and disconnect J103.
3) Set the door switch actuator into the door switch assembly, and turn on the power
switch.
4) Start service mode (
initial rotation (hexa decimal analog value) is between '0003' and '0001B'.
If not between '0003' and '0001B', suspect a fault on the DC controller PCB.
5) Turn off the power switch, and remove the door switch actuator.
6) Remove the jumper wire from the DC controller PCB.
7) Connect the connector to J103 on the DC controller PCB.
8) Turn on the power switch.
Method 2
1) Turn off the power switch.
2) Remove the blanking exposure lamp assembly.
3) Connect the connector of the potential sensor.
4) Set the potential sensor to the potential sensor checking electrode (FY9-3012).
Caution:
When setting the checking electrode to the potential sensor, make sure that the
magnet of the checking electrode will not touch the potential sensor cover.
11-44
COPYRIGHT © 1997 CANON INC.
), and check that the indication of address P023 during
2
Figure 11-248
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)