Canon SmartBase 1270D Service Manual page 311

Connector
8) Is the connection of the following connectors normal: J201 and
NO:
Cartridge
9) Try replacing the cartridge. Is the problem corrected?
YES: End.
Laser scanner unit, DC controller PCB
10) Try replacing the laser scanner unit. Is the problem corrected?
YES: End.
NO:
Transfer guide
11) Measure the transfer guide and other metal portions. Is the resis-
YES: Check the area around the toner guide for a piece of metal (e.g.,
High-voltage contact (between transfer charging roller and high-voltage spring)
12) Is the high-voltage spring used to supply high voltage to the trans-
YES: Clean it.
High-Voltage Contact (high-voltage spring and DC controller PCB; J209), Transfer charging
roller
13) Is the connection between the high-voltage spring and DC control-
YES: Replace the transfer charging roller.
NO:
Selfoc lens array (contact sensor)
14) Clean the selfoc lens array of the contact sensor. Is the problem cor-
YES: End.
Contact sensor LED intensity auto adjustment
15) Execute contact sensor LED intensity auto adjustment. Is the prob-
YES: End.
Connector
16) Is the connection of the following connectors normal: J501 and
NO:
COPYRIGHT © 2002 CANON INC.
J204 on the DC controller PCB; J303, J304, J312, and J316 on the
image processor PCB; J3122 and J801 in the laser scanner unit?
Connect them firmly. If a scratch is found in the flexible cable, re-
place it.
Replace the DC controller PCB.
tance 0 Ω Ω Ω Ω Ω
screw).
fer charging roller soiled?
ler PCB (J209) normal?
Correct it. If it cannot be corrected, replace the faulty part.
rected? (See 4.3.1 of Chapter 6.)
lem corrected? (See 1.2.4.1 of Chapter 7.)
J503 on the analog processor PCB; J317 on the image processor
PCB; and J504 of the contact sensor?
Connect them firmly. If the flexible cable has a scratch, replace it.
2000 2000 2000 2000 CANON SmartBase PC1210D/1230D/1270D REV. 1 MAR. 2002
CHAPTER 7 TROUBLESHOOTING
7-23