Read Sharp ER-A410 / ER-A420 (serv.man3) Service Manual online
ER-A410/ER-A420
HARDWARE DESCRIPTION
– 9 –
POWER SUPPLY/CONTROL PINS
4. PRINTER CONTROL
The PR-45M printer is used.
4-1. STEPPING MOTOR CONTROL
The stepping motor is driven at a constant voltage by Sanken STA471A.
1step: 0.125mm, 1dot: 1step
Printing speed: 50mm/s
<CPU’s PORT>
<DRIVING STEP>
RECEIPT MOTOR
*
When the motor is at rest, the same phase as the final excitation
phase is RUSH energized for 10 ms to turn off all phases.
3
Turn all AS~RDS and JAS~JDS into L.
No energizing should be allowed at least 30 ms after stopping the
motor before restarting.
When starting the motor, the first excitation phase is RUSH energized
When starting the motor, the first excitation phase is RUSH energized
for 10 ms to start the motor by acceleration control.
P96
1
O
P96
LCDON
L
Out L
LCD POWER ON
P97
100
I
P97
IPLON
In
IPL ON SIGNAL
P100
97
I
AN0
TM
In
HEAD TEMPERA-
TURE MONITOR
TURE MONITOR
P101
95
I
AN1
VPTEST
In
HEAD VOLT-
AGE MONITOR
AGE MONITOR
P102
94
I
AN2
VREF
In
REFERENCE
VOLTAGE
VOLTAGE
P103
93
O
AN3
/STRB1
H
In
PRINTER STORE
SIGNAL 1
SIGNAL 1
P104
92
O
AN4
/STRB2
H
In
PRINTER STORE
SIGNAL 2
SIGNAL 2
P105
91
O
P105
/STRB3
H
In
PRINTER STORE
SIGNAL 3
SIGNAL 3
P106
90
O
P106
/STRB4
H
In
PRINTER STORE
SIGNAL 4
SIGNAL 4
P107
89
O
P107
LATCH
L
In
PRINTER
LATCH SIGNAL
LATCH SIGNAL
PORT
PIN No.
I/O
PIN NAME
FUNCTION
BYTE
8
I
BYTE
Connected to VDD
CNVSS
9
I
CNVSS
Connected to GND
/RESET
12
I
/RESET
XOUT
13
O
XOUT
OPEN
VSS
14
VSS
Connected to GND
XIN
15
I
XIN
Connected to Spectram
VCC
16
VCC
Connected to VDD
VCC
62
VCC
Connected to VDD
VSS
64
VSS
Connected to GND
AVSS
96
AVSS
Connected to GND
VREF
98
VREF
Connected to VDD
AVCC
99
AVCC
Connected to VDD
PORT
PIN
No.
I/O
Pin
name
Signal
name
Initial
value
value
OFF
MODE
Function
No.
CPU PORT
Signal to be used
80
P10
RAS
79
P11
RBS
78
P12
RCS
77
P13
RDS
76
P14
JAS
75
P15
JBS
74
P16
JCS
73
P17
JDS
Driver IC input (CPU output)
Motor drive signal
STEP
RAS
RBS
RCS
RDS
/RPFA /RPFB /RPFC /RPFD
1
H
L
L
H
L
H
H
L
2
L
H
L
H
H
L
H
L
3
L
H
H
L
H
L
L
H
4
H
L
H
L
L
H
L
H
Driver IC input (CPU output)
Motor drive signal
STEP
JAS
JBS
JCS
JDS
/JPFA
/JPFB
/JPFC
/JPFD
1
L
H
H
L
H
L
L
H
2
L
H
L
H
H
L
H
L
3
H
L
L
H
L
H
H
L
4
H
L
H
L
L
H
L
H
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