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84 MFP unit explanation ENWW
First paper feed control
The first paper feed from Tray 4 takes place
as the result of the transmission of the drive
force from M1 (paper feed) to each pick
roller by MC7 (paper feed MC/3) and MC8
(pre-registration MC/3). The feed roller picks
up paper using its own weight.
The above operations are controlled by the
PRCB (printer control board). Related
signals are PS13 (paper feed/3) and PS27
(vertical conveyance/3) issued from the
vertical conveyance section.
1 Operation
a Operation of the MC7 (paper feed
MC/3)
1 Start timing of printing of the first copy
MC7 (paper feed MC/3) turns on at
the timing that is determined by the P
counter from when copying starts,
and turns off after a lapse of the
specified time from PS13 (paper
feed/3) turning off. Thus, paper skew
is corrected by forming the loop
before pre-registration roller.
2 Start timing of printing of the second
copy
When the preceding paper turns off
PS13.
3 OFF timing
When PS13 is turned on.
b Operating of the MC8 (pre-registration
MC/3)
1 ON timing
After a specified time from the MC7
(paper feed MC/5).
2 OFF timing
When PS13 (paper feed/3) is turned
off.