Manual Feed Pickup Unit; Pickup Operation; Detecting The Size Of Paper In The Manual Feed Tray - Canon iR6570 series Service Manual

8.5 Manual Feed Pickup Unit

8.5.1 Pickup Operation

The presence/absence of paper in the manual feed tray is detected by the manual feed paper sensor (PS23). The manual feed pull-off roller is operated by
the drive coming from the main motor by way of the manual feed pickup clutch (CL3).
When the clutch engages, the holding plate solenoid goes on so that the manual feed holding plate moves up.
In response, the gear of the feed roller receives the drive of the main motor, causing the feed roller to make a single rotation for movement of paper.
While the feed roller is rotating, the paper is moved by the manual feed roller as far as the registration roller.

8.5.2 Detecting the Size of Paper in the Manual Feed Tray

The user may set the side guide of the manual feed tray to suit the width of paper he/she is using. The reading of the variable resistor that operates in
conjunction with the movement of the side guide is monitored by the DC controller PCB for detection of paper width. The machine does not have a specific
mechanism to detect the length of paper, requiring the user to specify it.
The width that has been detected is used when the machine executes laser exposure control. The machine refers to the length of time during which the
manual feed paper sensor (PS23) remains on to find out the length of paper when the manual feed tray is used.
If the variable resistor has been replaced, the paper width basic value must be registered newly.
DC controller PCB
M1
Feed roller
Manual feed
Registration roller
pull-off roller
A
Paper
A
PS23
Manual feed holding plate
Separation roller
F-8-19
T ray
Chapter 8
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0009-3182
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