Service manual

VERTICAL PAPER CONVEYANCE SECTION
2-M-2
2 UNIT EXPLANATION
[3] Vertical Paper Conveyance Control
In the vertical paper conveyance section, paper is fed
vertically by transmitting the drive force of M4 (paper
feed) to the vertical conveyance middle and lower roll-
ers via MC9 (vertical conveyance MC1) and MC10
(vertical conveyance MC2). The upper roller is driven
by M6 (loop roller). Each of these is controlled directly
by PRCB (printer control board). Related signals are
PS18 (vertical conveyance 1), PS53 (vertical convey-
ance 2), PS19 (vertical conveyance 3), PS54 (loop),
and PS17 (open/close detection).
When the front right or left door of this machine opens
or closes, MS1 (interlock 1) or MS2 (interlock 2) oper-
ates to interrupt the DC power supply to the motor,
stopping M6.
1. Operation
Paper supplied from one of trays 1-3 is then fed
to the second paper feed unit by the M4 and M6’s
drive force transmitted via MC9 and MC10. Since
the linear velocity of the vertical conveyance mid-
dle and lower rollers driven by M4 is kept con-
stant at high speed rotation, the vertical
conveyance middle and lower rollers are stopped
by turning off MC9 and MC10 while paper is fed
by the registration roller at low speed. At this
point the upper roller operates at low speed. In
trays 2 and 3, the first paper feed operation starts
earlier than the second paper feed operation
starts. Accordingly, the paper condition in the
second paper feed section is detected by PS53
to turn OFF MC9 and MC10, stopping the con-
veyance temporarily.
2. Signals
a. PRCB input signals
(1) PS17 (PS17 to PRCB)
Vertical conveyance section opening/closing
detection signal.
[L]: Open
[H]: Closed
(2) PS18 (PS18 to PRCB)
Tray 1 exit paper passage detection signal (for
jam detection).
[L]: Paper is detected
[H]:Paper is not detected
(3) PS19 (PS19 to PRCB)
Tray 3 exit paper passage detection signal (for
jam detection).
[L]: Paper is detected
[H]:Paper is not detected
(4) PS53 (PS53 to PRCB)
Tray 2 exit paper passage detection signal (for
timing detection).
[L]: Paper is detected
[H]:Paper is not detected
(5) PS54 (PS54 to PRCB)
M6 control timing detection signal.
[L]: Paper is detected
[H]:Paper is not detected
(6) M4 EM (M4 to PRCB)
M4 fault detection signal.
[L]: Abnormal
[H]: Normal
b. PRCB output signals
(1) M4 CONT (PRCB to M4)
M4 drive control signal.
[L]: M4 ON
[H]: 4 OFF
(2) MC9 CONT (PRCB to MC9)
MC9 drive control signal.
[L]: MC9 ON
[H]: MC9 OFF
(3) MC10 CONT (PRCB to MC10)
MC10 drive control signal.
[L]: MC10 ON
[H]: MC10 OFF
PRCB
DCPS2
DCPS1
PS54
PS18
PS53
PS19
PS17
M4 CONT
M4 EM
M4 CLK
M4 FR
5VDC
SGND
5VDC
PS54
SGND
24VDC
PGND
24VDC
PGND
M4
PS18
PS53
PS19
PS17
MC9
MC10
24VDC
MC9 CONT
MC10 CONT
24VDC
24VDC
M6 DRIVE A
M6 DRIVE A
M6 DRIVE B
M6 DRIVE B
M6
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