Light Intensity Adjustment - Canon imageRUNNER ADVANCE C3500 III Series Service Manual

Table of Contents

• 34-0034: The correction value (C) of the write start position in the vertical scanning direction exceeded the upper

limit during fine adjustment of color displacement

• 34-0036: The correction value (C) of the write start position in the horizontal scanning direction exceeded the upper

limit during fine adjustment of color displacement

• 34-0044: The correction value (Bk) of the write start position in the vertical scanning direction exceeded the upper

limit during fine adjustment of color displacement

• 34-0046: The correction value (Bk) of the write start position in the horizontal scanning direction exceeded the

upper limit during fine adjustment of color displacement

• 34-2201: As a result of wrong detection processing, data that can be used for correction in the vertical scanning

direction was not found (M)

• 34-2211: As a result of wrong detection processing, data that can be used for correction in the horizontal scanning

direction was not found (M)

• 34-2301: As a result of wrong detection processing, data that can be used for correction in the vertical scanning

direction was not found (C)

• 34-2311: As a result of wrong detection processing, data that can be used for correction in the horizontal scanning

direction was not found (C)

• 34-2401: As a result of wrong detection processing, data that can be used for correction in the vertical scanning

direction was not found (Bk)

• 34-2411: As a result of wrong detection processing, data that can be used for correction in the horizontal scanning

direction was not found (Bk)

• 34-5001: The value of the color displacement patch exceeded the upper limit (front side)

• 34-5003: The value of the color displacement patch exceeded the upper limit (rear side)

■ Patch Sensor Adjustment

The correction of the Patch Sensor light intensity and sampling of the ITB background are performed.

Configuration of the Patch Sensor

The light produced by the LED is reflected from the patch image and detected by the light-receiving element.

There are two types of waves that are P wave and S wave, and the light intensity is detected by the light-receiving element.

Light intensity adjustment

The light intensity of the Patch Sensor is changed sequentially and adjusted such that the P wave output becomes the control

Sampling of the ITB background

To prevent uneven reflection in the inner circumference of the ITB, the background of the whole circumference of the ITB is

sampled by the Patch Sensor without forming patches.

The patch image that is read is compared with the sampling results of the ITB background to read the density.

Patch Sensor

Light-receiving

Light-emitting

Light-receiving

2. Technology