Canon imagePRESS 1135 Series Service Manual page 91

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Technology > Image Formation System > Various Types of Control > Transfer/Separation
Related Error Code
• ITB motor error
E012-0020: While driving, 0.5 sec-off-timing occurred during lock.
E012- 0021: When the motor stops, off-timing lock is detected.
● Intermediate Transfer Method
Tranfer toner on the photosensiive drum to the paper via the intermediate transfer media
instead of directly transferring it to the paper.
Reason of Introduction
1) Improve separation performance of thin paper (52 g paper).
Higher separetion performance can be obtained with intermediate transfer method because
the method uses smaller-diameter rollers for the transfer nip assembly than those of the
photosensitive drum.
2) To improve the transfer performance for texture paper
The intermediate transfer medium can apply the higher transfer pressure than the
photosensitive drum – transfer roller.
Photosensitive
ITB unit
Secondar transfer
internal roller
Paper
Secondar transfer external roller
2 Technology > Image Formation System > Various Types of Control > Transfer/Separation
drum
Primary
chargingroller
Toner
ITB
F-2-56
Intermediate transfer belt (ITB) Media to make toner attached.
Primary transfer roller Attach the toner on the photosensitive drum to the ITB.
Secondary transfer internal roller Attach the toner on the ITB to the paper.
Secondary transfer external roller Feed paper.
ITB drive roller Rotate the ITB.
ITB cleaning unit Collect the toner on the ITB.
Patch sensor Read a patch image for image density detetion transferred to
the ITB.
● Pre-primary Transfer Charging Bias Control
Keep an appropriate charging level of the toner on the photosensitive drum and increase
transfer efficiency.
Description
Apply the pre-primary transfer charging bias (DC negative) generated at the pre-primary
transfer charging high-voltage PCB (PCB25) to the pre-primary transfer charging wire.
● Primary Transfer Bias Control
Transfer the toner on the photosensitiv drum onto the ITB.
Apply the primary transfer bias (DC positive) generated at the primary transfer high-voltage
PCB (PCB22) to the primary transfer roller.
The bias value is determined based on the measurement value detected by PS124.
● Secondary Transfer Bias Control
Transfer the toner on the photosensitive drum onto the paper.
Apply the secondary transfer bias (DC negative) generated at the secondary transfer high-
voltage PCB (PCB23) to the secondary transfer inner roller.
The bias value is determined based on the measurement value and paper type detected by
PS124.
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T-2-38
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