Canon iR C3380 series Service Manual Download

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Chapter 7

7-25

COPIER > ADJUST > LASER >FSLUT-C 1 to 8 correction values for partial magnification correction Y blocks 1 to 8

COPIER > ADJUST > LASER >FSLUT-K 1 to 8 correction values for partial magnification correction K blocks 1 to 8

Also, when the DC controller circuit board is replaced, the above values should be entered as per the details on the service label or on the P-PRINT label.

7.3.10 ATVC Control

0013-8495

/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880

In the case of transferring toner, this control has 2 types of controls: the primary transfer ATVC and the secondary transfer ATVC, to decide the most suitable

transfer bias.

F-7-34

[1] Primary transfer roller

[2] Secondary transfer outside roller

[3] Machine inside environment sensor

[4] Machine outside environment sensor

1. Primary Transfer ATVC

The machine executes primary transfer ATVC when determining the primary transfer bias used to ensure the target transfer current level for transfer.

a. Timing for start-up

- when the power is ON

- during warm-up rotation

- in the case of continuous passage of paper, when the accumulated value is 200 prints from the last time ATVC execution.

- comparing from the last time ATVC execution, the initial rotation when the inside humidity is 10% or more, or when the change of humidity is 2 deg C or more.

- comparing from the last time ATVC execution, the next initial rotation of post accumulating 100 prints.

- immediately before D-half

- warm-up rotation in the case of sleep return of 8 hours or more.

- When new drum unit is installed.

b. Particulars of Control

T-7-12

2. Secondary Transfer ATVC

The machine executes secondary transfer ATVC when determining the secondary transfer bias so that the target transfer current may be obtained for transfer.

a. Start-Up Conditions

- at power-on

- when the drum unit is replaced with a new one

- during initial rotation

- during post-rotation executed every 1000 prints

- during recovery from sleep

- during execution of calibration

b. Particulars of Control

T-7-13

Sequence

Item

Description

Applying the primary transfer bias

A specific bias is applied to the primary transfer roller, and HVT2 is used to detect the
level of current for feedback to the DC controller.

Monitoring the machine inside environment sensor

The DC controller monitors the output of the machine inside environment sensor.

Determining the primary transfer bias

The DC controller determines the best primary transfer bias for individual colors based
on the foregoing 3 sets of data.

Sequence

Item

Description

Applying the secondary transfer bias

A specific bias is applied to the secondary transfer roller, and HVT2 is used to detect
the level of current for feedback to the DC controller.

Monitoring the machine outside environment sensor

The DC controller computes the secondary transfer bias correction value with
reference to the output of the compensatory environment sensor (i.e., the degree of
moisture in paper) and print job information (i.e., paper type, 1st/2nd side).

Canon iR C3380 series, Service Manual

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