M10 (Transfer/Separation Cleaning) Control - Minolta Di551 Service Manual

[6] M10 (Transfer/Separation Cleaning)
Control
IO DTXD
IO DCLK
ADU LATCH
IO UCLK
REQ1
IO URXD
ACK1
ERR OUT1
PRCB
5V2
S.GND
24V1
5V2
S.GND
P.GND
DCPS
M10 (transfer/separation cleaning) is a DC motor
powered by 24 VDC and is controlled by PRCB
(printer control board) via ADUDB (ADU drive
board). Between PRCB and ADUDB, signals are
exchanged using serial data.
1. Operation
a. Purpose of driving
M10 (transfer/separation cleaning) used to drive
the transfer/separation wire cleaning pads.
b. Operation timing
The transfer/separation wires are cleaned when
SW2 (sub power) is turned ON or when the fixing
temperature is lower than 50°C.
It is also carried out after the specified copy count
is reached.
* Changeable with the 25-mode DIP SW
c. Cleaning operation
Normally, the transfer/separation wire cleaning
pads are on the front side of the machine. They
move back and forth to clean the transfer and
separation wires. The movement direction is
changed by changing the rotational direction of
M10 (transfer/separation cleaning).
The rotational direction of M10 and the position
of the cleaner are detected by monitoring the cur-
rent value of M10 with PRCB (printer control
board).
SEP CLM M A
M10
SEP CLM M B
ADUDB
2-F-5
CORONA UNIT SECTION
2. Signals
a. Input signals
(1) IO_URXD (ADUDB to PRCB)
Serial data used to report the ADUDB (ADU
drive board) operation state to PRCB (printer
control board)
(2) REQ1 (ADUDB to PRCB)
This signal indicates that sending data from
ADUDB (ADU drive board) to PRCB (printer con-
trol board) is requested.
When ADUDB receives ACK1 and can send
data, this signal stands at the [L] level.
(3) IO_UCLK (ADUDB to PRCB)
Clock signal for IO_URXD signal
b. Output signals
(1) SEP_CLM_M A, B (ADUDB to M10)
M10 (transfer/separation cleaning) drive control
signal
The drive direction of M10 (transfer/separation
cleaning) drive control signal
The drive direction of M10 is controlled by switch-
ing between the drive current directions of two
signals.
Status SEP_CLM_MA SEP_CLM_MB
Forward stroke of
cleaning
Backward stroke
of cleaning
Stop
(2) IO_DTXD (PRCB to ADUDB)
Serial data used to report the machine operation
state understood by PRCB (printer control
board) to ADUDB (ADU drive board)
(3) IO_DCLK (PRCB to ADUDB)
Clock signal for IO_DTXD signal
(4) ADU_LATCH (PRCB to ADUDB)
Latch signal for IO_DTXD signal
(5) ACK1 (PRCB to ADUDB)
Reception acknowledgment signal. It is sent
each time PRCB (printer control board) receives
one-byte data from ADUDB (ADU drive board).
When PRCB receives REQ1 and can receive
data, this signal stands at the [L] level.
(6) ERR_OUT1 (PRCB to ADUDB)
This signal requires resending of data when
PRCB (printer control board) has failed in data
reception from ADUDB (ADU drive board) due to
an error.
H L
L H
L L