Service manual

ADU
2-N-3
2 UNIT EXPLANATION
*1 Second paper feed paper mis-centering correc-
tion
PS1 (paper mis-centering) is mounted at the exit
of the registration roller to detect mis-centering
or inclination of paper fed from the second paper
feed unit. The image processor uses the mis-
centering information detected by PS1 to correct
the image write position, thus shifting or rotating
the image write position on the mis-centered or
inclined copy paper in order to match the docu-
ment (scanned image) position with the copy
paper position.
*2 Second paper feed auxiliary mechanism
The distance between the registration roller and
the transfer and separation corona unit of this
machine is made long to ensure image position
correction operation. To assist paper convey-
ance between the registration roller and the
image transfer and separation corona unit, a pre-
transfer roller is provided just before the transfer
and separation corona unit.
*3 Second paper feed unit jam removal mechanism
The registration roller is sandwiched between
the registration loop jam removal section and the
pre-transfer jam removal section. Jammed paper
can be removed by opening the jam removal sec-
tion and turning the registration roller rotation
knob.
*4 Paper conveyance unit thick paper conveyance
auxiliary mechanism
To facilitate feeding the thick paper fed from the
transfer and separation corona unit, thick paper
conveyance rollers are provided. The installation
positions of thick paper conveyance rollers are
fixed and they are also used to assist convey-
ance of paper other than thick paper.
Transfer/separation
corona unit
Pre-transfer
section roller
Registration roller
Registration roller rotation knob
Pre-transfer section jam handler
Registration loop jam handler
Conveyance belt
Thick paper conveyance roller
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