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Operation of Control Parts
(2) Ribbon motor driver
This is a driving circuit to drive the "SA Ribbon Motor F" and "SA Ribbon Motor R" (stepping
motors). The "SA Ribbon Motor F" is used to take up ribbon, while the "SA Ribbon Motor R" is
used to supply ribbon.
Since the motor drive circuit is the same as for both motors, the following describes only for the
"SA Ribbon Motor F" that takes up ribbon.
The "SA Ribbon Motor F" is driven by U101 (Motor Driver) via the RIBSTEP_A signal sent from
U1A (CPU). The rotational direction of the motor is determined by the RIBDIR_A signal sent
from U14 (FPGA). The strength of PF motor excitation (strong and weak) or PF motor current
is controlled by the RBMOTCU signal sent from the U7 (D/A Converter) via U1A (CPU).
Ribbon motor forcible stop function by circuitry:
The CPU monitors the temperature of the "SA Ribbon Motor F" and stops it if its temperature
reaches a certain level, as mentioned in
In addition to this function, for further safety measures, a circuitry is provided to forcibly stop
the ribbon motors. When the signal nTEMP_ERROR becomes "Low" level, pin2 (ENABLE) of
U101 and U102 becomes "High" level, resulting in stopping the "SA Ribbon Motor F" as well as
"SA Ribbon Motor R".
The signal nTEMP_ERROR is an ORed error of the following signals.
- Abnormal ribbon motor temperature
- Abnormal PF motor temperature
- Abnormal head temperature
- Abnormal cutter temperature (Optional)
U1A
CPU
122
D24
126
D28
N13
B3_37
U14
N14
FPGA
B3_38
From
U7
U1A CPU
D/A Converter
12
DI
11
CK
10
CSB
BH2227
From
RIBTRG
U14 FPGA
From
nGRESET
U1A CPU
(From Ribbon Motor
nTEMP_ERROR
Temperature Sensor)
Normally "High".
Error: Low
CL-S6621
VMT
(24V)
J19
R144
3,4
RIBSTEP_A
RIBSTEP_B
RIBDIR_A
RIBDIR_B
AO1
AO2
RBMOTCU_A
AO3
5 RBMOTCU_B
AO4
6
U15B
Monostable
Multivibrator
U29
9
5
1
4
A
Q
10
2
B
11
CLR
74VHC123
[SA, Main PCB]
"(6) Ribbon motor temperature
(24V)
VMT
J102
3,4
VMT
5
5
RIBSTEP_A
6
6
RIBSTEP_B
7
RIBDIR_A
7
8
8
RIBDIR_B
9
9
RBMOTCU_A
10
10
RBMOTCU_B
11
11
MOT_EN
[SA, Ribbon PCB]
2-32
sensor".
U101
Motor Driver
J101
19
21
VBB1
OUT1A
24
VBB2
18
14
OUT1B
STEP
22
17
OUT2A
DIR
1
OUT2B
2
ENABLE
15
REF
A4984SES-T
U102
Motor Driver
J103
(Same as above
circuit)
SA Ribbon Motor F
(Take-up Side)
3
4
M
2
1
SA Ribbon Motor R
(Supply Side)
3
4
2
M
1
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