Read Sharp AR-FN5 (serv.man3) Service Manual online
4. I/F circuit and reset circuit
This unit performs serial communication with the copier in the ad-
vancement synchronization mode where synchronization is made in
the unit of a character.
vancement synchronization mode where synchronization is made in
the unit of a character.
The signal (FINSTS) sent from the machine and the communication
allow signal (/FINCRDY) are received by the CPU on the finisher side
through the buffer circuit. Similarly, the send signal (FINCMD) from
the finisher and the communication allow signal (/FINSRDY) are re-
ceived by the CPU on the machine through the buffer IC 74VHC244
(IC104).
allow signal (/FINCRDY) are received by the CPU on the finisher side
through the buffer circuit. Similarly, the send signal (FINCMD) from
the finisher and the communication allow signal (/FINSRDY) are re-
ceived by the CPU on the machine through the buffer IC 74VHC244
(IC104).
Similarly, the reset signal is passed to the CPU reset pin on the
finisher side through the IC105.
finisher side through the IC105.
Signal name
Content
Logic (Connector level)
FINSTS
Line of signals sent from the copier to the finisher
H: Start bit detected
L: Normal (Mark state)
L: Normal (Mark state)
FINCMD
Line of signals sent from the finisher to the copier
L: Start bit detected
H: Normal (Mark state)
H: Normal (Mark state)
/FINCRDY
Line of signal which indicates the status of the communication request answer when
sending signals from the finisher to the copier
sending signals from the finisher to the copier
H: Communication disable
L: Communication enable
L: Communication enable
/FINSRDY
Line of signal which indicates the status of the communication request when sending
signals from the finisher to the copier
signals from the finisher to the copier
H: No request for communication
L: Communication request state
L: Communication request state
/RES
Line of hard reset signal from the copier
L: Reset state
H: Reset cancel state
H: Reset cancel state
5V
5V
5V
5V
5V
1A1
2
1A2
4
1A3
6
1A4
8
2A1
11
2A2
13
2A3
15
2A4
17
1G
1
2G
19
1Y1
18
1Y2
16
1Y3
14
1Y4
12
2Y1
9
2Y2
7
2Y3
5
2Y4
3
20
GND
10
1
8
2
7
3
6
4
5
1
8
2
7
3
6
4
5
1A1
2
1A2
4
1A3
6
1A4
8
2A1
11
2A2
13
2A3
15
2A4
17
1G
1
2G
19
1Y1
18
1Y2
16
1Y3
14
1Y4
12
2Y1
9
2Y2
7
2Y3
5
2Y4
3
VCC
20
GND
10
BR1
10kX4
10kX4
R141
4.7k
4.7k
reserve
/RES
FINSTS#
/FINCRDY#
P60
/RES
RxD0
PF1
C145
1000pF/50V
1000pF/50V
C139
22000pF/25V
IC105
74VHCT244M
C181
0.1uF/25V
0.1uF/25V
/RES
FINSTS
/FINCRDY
FINCMD
/FINSRDY
3.3V
IC104
VCC
74VHC244M
C180
0.1uF/25V
C146
1000pF/50V
1000pF/50V
TxD0
PF0
FINCMD#
/FINSRDY#
BR2
10kX4
10kX4
R142
4.7k
4.7k
Click on the first or last page to see other AR-FN5 (serv.man3) service manuals if exist.