Vertical Conveyance Control - Minolta Di551 Service Manual

VERTICAL CONVEYANCE SECTION

[3] Vertical Conveyance Control

24V1
P.GND
5V2
S.GND
24V2
P.GND
MS1
DCPS
MS2
FEEDM_CONT
FEEDM_CLK
M1
FEEDM_F/R
FEEDM_EM
5V
P.GND
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 (lower) via
MC11 (vertical conveyance MC/1) and MC12
(vertical conveyance MC/2). The above parts are
controlled by PRCB (printer control board).
Related signals are PS25 to PS27 (vertical con-
veyance/1 to /3) and PS29 (vertical conveyance
door open/close).
1. Operation
Paper fed from tray 1 is then fed to the second
paper feed unit directly without passing through
vertical conveyance rollers. When paper is fed
from tray 2 or 3, 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 (vertical conveyance MC/1 and
MC/2) are turned ON and the paper fed from tray
2 or 3 is fed to the standby position (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 regis-
tration of the preceding paper to rotate all vertical
conveyance rollers, thus feeding paper to the
second paper unit.
MC24V_2
MC11
VFMC1_DRV
MC24V_2
MC12
VFMC2_DRV
5V3
PS25
T1PASS_PS
S.GND
5V3
T4PASS_PS PS26
S.GND
5V3
T2PASS_PS PS27
S.GND
5V3
VF_DOOR_PS PS29
S.GND
PRCB
2-M-2
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) VF_DOOR_PS (PS29 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