Paper Conveyance Control - Konica Minolta 7155 Service Manual

[4] Paper Conveyance Control

5V
MAINEXIT PS
S.GND
IO DTXD
IO DCLK
ADU LATCH
IO UCLK
REQ1
IO URXD
ACK1
ERR OUT1
2NDM CLK
PRCB
5V2
24V1
S.GND
MS1 MS2
24V2
P.GND
24V1
5V2
S.GND
P.GND
DCPS
The paper fed from the second paper feed sec-
tion is fed to the fixing unit by the pre-transfer
roller and conveyance belt driven by M5 (convey-
ance). In the conveyance section, paper suction
is provided by FM3 (conveyance suction)
through the duct installed on the back of the con-
veyance belt. M5 and FM3 are controlled by
PRCB (printer control board) via ADUDB (ADU
drive board).
1. Operation
a. M5 (conveyance) operation
M5 (conveyance) starts when the START button
is pressed, and it stops when the PS37 (paper
exit) turns OFF at detection of the trailing edge of
the last sheet of paper.
b. FM3 (conveyance suction) operation
FM3 is turned ON/OFF in sync with M2 (drum).
PS37
SUC FAN
FM3
SUC EM
P.GND
+5V
PGND
START/STOP
CLK
M5
CW/CCW
LD
H/L
PGND
+24V
ADUDB
2-N-9
2. Signals
a. Input signals
(1) MAINEXIT_PS (PS37 to PRCB)
Main body exit section paper passage detection
signal
[L]: Detected.
[H]: Not detected.
(2) SUC_EM (FM3 to ADUSDB)
FM3 (conveyance suction) fault detection signal
[L]: FM3 is normal.
[H]: FM3 is abnormal.
b. Output signal
(1) MAINEXIT_PS (ADUDB to FM3)
FM3 (conveyance suction) drive signal
[L]: FM3 OFF
[H]: FM3 ON
ADU