Service manual

TRAY 1/2 PAPER FEED UNIT
2-J-3
2 UNIT EXPLANATION
[3] First Paper Feed Control
The 1st paper feed from tray 1 or 2 takes place as
the result of the transmission of the drive force
from M4 (paper feed) to each paper feed roller,
via MC3 (feed MC 1), MC5 (feed MC 2), and MC4
(pre-registration MC1), MC6 (pre-registration
MC 2). SD8 (pickup SD1) or SD9 (pickup SD 2)
causes the roller to pick up paper.
The above operations are controlled by the
PRCB (printer control board). Related signals
include: PS47 (paper feed 1), PS49 (paper feed
2), PS48 (paper pre-registration 1), and PS50
(paper pre-registration 2).
1. Operation
a. First paper feed timing (feed MC drive)
(1) When printing of the first copy starts:
Timing that is determined by the P counter from
when copying starts
(2) When printing of the second copy starts:
When PS47 or PS49 of the first sheet of copy is
OFF.
(3) OFF timing
After a specified count from turns ON of PS48,
and PS50.
*Changeable in 36 mode
b. Feed timing (pre-registration drive)
(1) ON timing
First sheet: When a preset time interval has
passed after turning ON of MC3
or MC5.
Second sheet:When a preset time interval has
passed after turning ON of MC1
(registration).
(2) OFF timing
When PS47 or PS49 is turned OFF.
PRCB
DCPS1
DCPS2
M4 CONT
M4 EM
M4 CLK
M4 F/R
5VDC
SGND
24VDC
PGND
MC3
MC4
SD8
MC5
MC6
SD9
24VDC
MC3 CONT
MC4 CONT
SD8 CONT
24VDC
MC5 CONT
MC6 CONT
SD9 CONT
M4
PS47
PS48
5VDC
SGND
PS47 PS
PS48 PS
PS49
PS50
5VDC
SGND
PS49 PS
PS50 PS
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