VERTICAL CONVEYANCE SECTION
2-M-2
2 UNIT EXPLANATION
[3] Vertical Conveyance Control
In the vertical conveyance section, paper is fed
vertically by transmitting the drive force of M1
(paper feed) to the vertical conveyance roller
(upper) and vertical conveyance roller (middle)
via MC11 (vertical conveyance MC/1) and MC12
(vertical conveyance MC/2). And, the vertical
conveyance roller (lower) is driven by the vertical
conveyance roller (middle) via the timing belt.
The above parts are controlled by PRCB (printer
control board). Related signals are PS25 to
PS28 (vertical conveyance/1 to 3), PS29 (verti-
cal conveyance door open/close) and PS12 (ver-
tical conveyance door open/close /U).
1. Operation
Paper fed from tray 1 (7155/7165) or tray 1 or 2
(7255/7272) is then fed to the second paper feed
unit directly without passing through vertical con-
veyance rollers. When paper is fed from tray 2 or
3 (7155/7165) or tray 3 or 4 (7255/7272), PS26
(vertical conveyance/2) is used to feed paper to
the standby position. When PS26 is turned OFF
by the preceding paper, MC11 and MC12 (verti-
cal conveyance MC/1 and MC/2) are turned ON
and the paper fed from tray 2 or 3 (7155/7165) or
tray 3 or 4 (7255/7272) is fed to the standby posi-
tion (where PS26 was turned ON) by the drive
force of M1 (paper feed). MC11 and MC12 are
turned ON after lapse of the specified time from
restart of registration of the preceding paper to
rotate all vertical conveyance rollers, thus feed-
ing paper to the second paper unit.
The paper feed standby position for tray 4 is set
to the position where the PS28 (vertical convey-
ance /4) is turned ON. (7255/7272)
2. Signals
a. PRCB input signals
(1) T1PASS_PS (PS25 to PRCB)
Paper passage detection signal (for tray 1)
[L]: Not detected.
[H]:Detected.
(2) T2PASS_PS (PS26 to PRCB)
Paper passage detection signal (for tray 2)
[L]: Not detected.
[H]:Detected.
(3) T3PASS_PS (PS27 to PRCB)
Paper passage detection signal (for tray 3)
[L]: Not detected.
[H]:Detected.
(4) T4PASS_PS (PS28 to PRCB)
Paper passage detection signal (for tray 4)
[L]: Not detected.
[H]:Detected.
(5) VF_DOOR_PS (PS29 to PRCB)
Vertical conveyance section open/close detec-
tion signal
[L]: Open
[H]:Closed
(6) VF_DRT_PS (PS12 to PRCB)
Vertical conveyance section open/close detec-
tion signal
[L]: Open
[H]: Closed
b. PRCB output signals
(1) VFMC1_DRV (PRCB to MC11)
MC11 drive control signal
[L]: MC11 ON
[H]:MC11 OFF
(2) VFMC2_DRV (PRCB to MC12)
MC12 drive control signal
[L]: MC12 ON
[H]:MC12 OFF
4
7272ma2011
PS28
PS27
PS26
PS25
PS29
MC12
MC11
PRCB
DCPS
24V1
P.GND
5V2
S.GND
24V2
P.GND
FEEDM_CONT
FEEDM_CLK
FEEDM_F/R
FEEDM_EM
5V
P.GND
MC24V_2
VFMC1_DRV
MC24V_2
VFMC2_DRV
5V3
VF_DOOR_PS
S.GND
PS12
5V3
VF_DRT_PS
S.GND
5V3
T3PASS_PS
S.GND
5V3
T2PASS_PS
S.GND
5V3
T1PASS_PS
S.GND
5V3
T4PASS_PS
S.GND
MS2
MS1
M1
4
4
4
MODEL MANUAL REVISED EDITION DATE PAGE METHOD
SERVICE MANUAL Dec. 2003
7155/7165/7255/7272
2-M-2 REPLACEMENT
44
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