TRAY 1/2 (7155/7165), TRAY 3/4 (7255/7272) PAPER FEED UNIT
2-J-3
2 UNIT EXPLANATION
[3] First Paper Feed Control
The 1st paper feed from tray 1/2 takes place as
the result of the transmission of the drive force
from M1 (paper feed) to each paper feed roller by
MC3/5 (paper feed MC/1/2) and MC4/6(pre-reg-
istration 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 (verti-
cal conveyance/1/2) issued from the vertical con-
veyance 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 tim-
ing 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.
PS7
MC6
MC5
PS1
MC4
MC3
PRCB
DCPS
24V1
P.GND
5V2
S.GND
24V2
P.GND
FEEDM_CONT
FEEDM_CLK
FEEDM_F/E
FEEDM_EM
5V
P.GND
MC24V_1
T1FEED_DRV
MC24V_1
T1PREMC_DRV
MC24V_1
C
MC24_1
T2PREMC_DRV
5V3
T1PRE_PS
SGND
5V3
T2PRE_PS
SGND
MS2
MS1
M1
Tray 1
Tray 2
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