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ENWW Tray 2/3 paper feed unit 77
MFP unit explanation
First paper feed control
The 1st paper feed from Tray 2/3 takes
place as the result of the transmission of the
drive force from M1 (paper feed) to each
pick roller by MC3/5 (paper feed MC/1/2)
and MC4/6 (pre-registration MC/1/2). The
feed roller picks up paper using its own
weight.
The above operations are controlled by the
PRCB (printer control board). Related
signals are PS1/7 (paper feed/1/2) and
PS25/26 (vertical conveyance/1/2) issued
from the vertical conveyance section.
1 Operation
a Operation of the MC3/5 (paper feed
MC/1/2)
1 Start timing of printing of the first copy
MC3/5 (paper feed MC/1/2) 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 PS1/7 (paper
feed/1/7) 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
PS1/7
3 OFF timing
When PS1/7 is turned on
b Operation of the MC4/6 (pre-registration
MC1/2)
1 ON timing
After a specified time from MC3/5
(paper feed MC/1/2) turning on
2 OFF timing
When PS1/7 (paper feed/1/2) is
turned off
2 Signals
a PRCB input signals
1 T1PRE_PS (PS1 to PRCB)
Paper passage detection signal
(Tray 2)
[L]: Detected
[H]: Not detected