Adf_Single Pass Adf - Canon imageRUNNER ADVANCE 4551i Service Manual

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Table of Contents

■ Color displacement correction processing in vertical scanning direction

Color displacement correction control in vertical scanning direction is a processing to correct the displacement in RGB by shifting

pixels in the vertical direction (up to 1 pixel) to align GREEN with RED and BLUE images when RGB cannot be read such that

they are accurately overlapped at color scanning.

Example) Scanned image of black line when RED is shifted upwards and BLUE is shifted downwards compared to GREEN

There are 2 color displacement correction values in the vertical scanning direction, as indicated below. The correction values are

already adjusted at the time of shipping and stored as service modes. (In COPIER > ADJUST > CCD)

• COPIER > ADJUST > CCD > 100-RG

• COPIER > ADJUST > CCD > 100-BG

When a job is started, color displacement correction processing is performed based on the saved color displacement correction

ADF_Single pass ADF

■ Outline of Electric Circuits

This equipment is controlled by the Reader Controller PCB.

The relationship between the various electrical components is indicated below.

Scanner Unit

Related Error Code

Communication error between the Reader Controller PCB and the Scanner Unit

• E280 - 0001: Communication between the Reader Controller PCB and the Reader Scanner Unit was not completed within

the specified period of time.

• E280 - 0002: Disconnection of FFC between the Reader Controller PCB and the Reader Scanner Unit was detected.

• E280 - 0101: Communication between the Reader Controller PCB and the DADF Scanner Unit was not completed within

the specified period of time.

• E280 - 0102: Disconnection of FFC between the Reader Controller PCB and the DADF Scanner Unit was detected.

Communication error between the Reader Controller PCB and the DADF

• E400 - 0001: A communication error between the Reader Controller PCB and the DADF Driver PCB was detected.

• E400 - 0002: A communication error between the Reader Controller PCB and the DADF Driver PCB was detected.

• E400 - 0003: Disconnection of the harness between the Reader Controller PCB and the DADF Driver PCB was detected.

ADF fan error

• E412 - 0005: Rotation of fan was detected after the stop signal for the DADF Cooling Fan was transmitted.

• E412 - 0006: Stop of fan was detected after rotation signal for the DADF Cooling Fan was transmitted.

Different DADF model error

Reader Controller PCB

2. Technology