Pre-Transfer Exposure Led; Addition Of The Developing Fan(Ir105) - Canon ImageRunner iR8500 Series Service Manual

MEMO:
Pre-Transfer Exposure
Function: In an initial phase of the transfer process, the charges on the photosensitive drum (background potential) are reduced in advance, thereby
weakening the stack bonding between the photosensitive drum and the transfer paper and ultimately encouraging separation.
Timing: The LED is turned on 100 msec before the leading edge of an image reaches a specific point until its trailing edge leaves it

8.1.7 Pre-Transfer Exposure LED

iR8070
The machine uses a process speed of 450 mm/sec to support a copying speed of 80 pages/min (A4, Direct). To make up for the decrease in charging on
the photosensitive drum caused by the increase in the process speed, the machine uses a photosensitive drum with a high degree of charging capacity and
a pre-exposure lamp with a short wave length (660 nm), thus ensuring a specific degree of charging.
The higher process speed also decreases static charges used for separation; the pre-transfer exposure LED is used to compensate for the decrease:
MEMO:
Pre-Transfer Exposure
Function: In an initial phase of the transfer process, the charges on the photosensitive drum (background potential) are reduced in advance, thereby
weakening the stack bonding between the photosensitive drum and the transfer paper and ultimately encouraging separation.
Timing: The LED is turned on 100 msec before the leading edge of an image reaches a specific point until its trailing edge leaves it

8.1.8 Addition of the Developing Fan(iR105)

iR105
To prevent overheating of the developing assembly [1], a developing fan has been added to the front of the machine. (See 8.2 Fans)
Chapter 8
0008-8682
0006-9757
8-5