Canon NP6251 Service Manual page 625

CHAPTER 11 TROUBLESHOOTING
15. E050
Cause Step
Holding tray X
home position
sensor (PS21)
Holding tray X
motor (M8)
Holding tray
driver PCB
DC controller
PCB
16. E051
Cause Step
Holding tray Y
home position
sensor (PS20)
Holding tray Y
motor (M9)
Holding tray
driver PCB
DC controller
PCB
11-94
COPYRIGHT © 1997 CANON INC.
Checks
1 Is the holding tray X home
position sensor (PS21) normal?
2 Disconnect J209 from the holding
tray driver PCB. Is there electrical
continuity between the following
pins on the motor side?
J209-1 and -2
J209-5 and -6
3 Replace the holding tray driver
PCB. Is the problem corrected?
Checks
1 Is the holding tray Y home
position sensor (PS20) normal?
2 Disconnect J208 from the holding
tray driver PCB. Is there electrical
continuity between the following
pins on the motor side?
J208-4 and -5
J208-8 and -9
3 Replace the holding tray driver
PCB. Is the problem corrected?
YES/NO
NO
NO
YES
NO
YES/NO
NO
NO
YES
NO
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Action
Replace the sensor
(PS21).
Replace the holding tray
X motor (M8).
End.
Replace the DC
controller PCB.
Action
Replace the sensor
(PS20).
Replace the holding tray
Y motor (M9).
End.
Replace the DC
controller PCB.