Epson TM-U200 Series Technical Manual

Rev. A Mechanism Configuration and Operating Principles 2-27
TM-U200 Series (Type A/AM)Technical Manual
Confidential
Printer Mechanism Driver Circuits
Print head driver circuit
The head driver signal is output from CPU (U5) pins 64 to 72. Receiving this drive signal,
transistor array QM1 and QM2 and transistor array QM3 turn On, Off, and drive the head.
Power supply time to the head is adjusted by the supplied power voltage. The CPU (U5)
changes the power voltage between analog and digital at AN0 (pin 7) and decides and controls
the head power supply time according to the internal time table.
To prevent damage to the head during excessive printing, a heat sensor has been installed in the
print head. An analog-digital conversion of the partial pressure difference between the heat
sensor and R18 is carried out in AN1 (pin 8) of the CPU (U5) and the temperature is calculated. If
the head is overheating or working improperly, the
ERROR
LED flashes.
Figure 2-26 Print head driver circuit
COM (# 3.5.7 )
# 5
# 7
# 1
# 3
Print head unit
HEAD1
HEAD5
HEAD6
HEAD2
RM101
63
1
2
4
3
72
81
1
2
3
6
5
4
4
1
2
5
3
54
QM105
DM130
9
7
5
3
8
6
4
2
1
1
0
QM1
+5V
RM102
64
73
82
51
9
7
5
3
8
6
4
2
1
1
0
QM2
HEAD3
HEAD7
HEAD9
HEAD8
+24A
68
69
65
72
Q12
R101
1
2
3
CN7
4
5
6
7
8
9
10
11
12
13
14
15
P44
P45
P41
P50
HEAD4
67
66
70
P43
P42
P46
71
P47
64
P40
4
1
2
5
3
QM104
8 HD TEMP
P61/AN1
7 V DTC
P60/ANO
6
AVSS
5
AVCC
C30C31
R45
R46
R18
C19
C29
R8
+
C33
_
R19
+24DT
# 9
C0M ( # 1.2.9 )
THEM1
THEM2
# 4
# 6
# 8
COM (# 4.6.8 )
# 2
FG
D134
Q13
U5
+5V
+5V
D50
+5V
+5V
1
2
3
6
5
4
DM131
1
2
3
6
5
4
DM132
4
1
2
5
3
QM106
+5V
4
1
2
5
3
QM107

Epson TM-U200 Series Specifications

General

Brand	Epson
Model	TM-U200 Series
Category	Printer
Language	English