Overview Of Power Circuit; Reader Controller Pcb - Canon Color Image Reader - L1 Service Manual

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Technology

Overview of power circuit

Control of the host machine is conducted at the reader controller PCB.
Reader controller PCB also controls the DADF driver PCB and DADF scanner unit.
Following is the relations of each electrical part.
Reader
Host
controller
machine
PCB
Error Code
E270 (Error in the main scanning/sub scanning synchronization signal).
-0001 Sub scanning synchronization signal (VSYNC) is not properly transmitted from CMOS
PCB (front side scanner unit), and this causes image failure or abnormal termination.
-0002 Sub scanning synchronization signal (VSYNC) is not transmitted due to the error in the
main scanning synchronization signal (HSYNC), and this causes image failure or abnormal
termination.
-0101 Sub scanning synchronization signal (VSYNC) is not properly transmitted from CMOS
PCB (back side scanner unit), and this causes image failure or abnormal termination.
E280 (Communication error between reader controller PCB – scanner unit)
- 0001 If the communication is not started within the specifi ed time between reader controller
PCB – front side scanner unit.
- 0101 If the communication is not started within the specifi ed time between reader controller
PCB – back side scanner unit.
E400 (Communication error between reader controller PCB – DADF)
-0001 If reception error occurs during communication between reader controller PCB - DADF
-0002 If reception error occurs during communication between reader controller PCB - DADF
E490 (Error caused by incorrect DADF type)
-0001 If a not-supported DADF type is installed.
E473 (DDI communication error)
-0000 If the reader controller PCB detects communication error between the main controller
PCB and the reader controller PCB.
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Technology
Motor
Fan
Sensor
Scanner unit (reader)
Scanner unit (DADF)
DADF driver PCB

Reader controller PCB

Following is the function confi guration of reader controller PCB.
Jack No
J101 Power supply from the host machine (printer unit)
J103 Connection with DADF open sensor 1/2, scanner unit HP sensor
J104 Connection with fan
J201 Connection with scanner unit on reader
J202 Connection with scanner unit on DADF
J203 Communication with DADF
J204 Connection with PC
J205 Control of scanner motor
J206 Communication with main controller
J207 Connection with original size sensor 1/2
J208 Power supply for DADF
Role
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