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TTP-248M Bar Code Printer
Service Manual
3.9 Print Head
DI1
/LAT
CLK
R107
22K
Z1
3.3V
TM
R108
6.2K
R15 1K
Vdet
/RESET_PH
Vdet
AGND
ANALOG GND
L-GND
1
L-GND
3
Vdd
4
Vdd
2
CLK
6
STB1
18
STB2
17
STB3
9
STB4
5
TM
11
TM
12
/LAT
10
DI1
19
DI2
15
DI3
13
DI4
7
DO1
20
DO2
16
DO3
14
DO4
8
JP18A
ROHM_KF2004_GL41AVDD
DI2
DI4
DI3
STORBE1
STORBE2
STORBE3
STORBE4
AVCC
STB1
STB2
STB3
STB4
R44
10K
R45
10K
R46
10K
R47
10K
VDD
Q6
HSC945
Q7
IRF4905
Q8
IRF4905
VMM
R48
10K
R109
8.2
R49
10K
R16
1K
ANALOG GND
C62
2200uF
AGND
BC33
0.1uF
GND
VDD
1 2
U7A
74HCT14
3 4
U7B
74HCT14
5 6
U7C
74HCT14
89
U7D
74HCT14
74LS14 CONNECT BY VDD
AGND
1011
U8E
74HCT14
1213
U8F
74HCT14
1 2
U8A
74HCT14
3 4
U8B
74HCT14
5 6
U8C
74HCT14
89
U8D
74HCT14
VH
1
VH
2
VH
3
P-GND
4
P-GND
5
P-GND
6
JP18B
GND
C79
2200uF
Fig. 3.7 Print Head (ROHM KF2004-GL41B)
Print Head Sensor
The voltage of sender is about 1.18V (1.17V~1.19V)