23
TTP-243 Bar Code Printer
Service Manua
l
3.8 Thermal Head Drive/ Protection and History Control Circuit
VH
1
GND
2
VH
3
GND
4
VH
5
GND
6
/LAT
7
DI2
8
DI1
9
NC
10
STB4
11
STB3
12
STB2
13
STB1
14
TM
15
TM
16
DO1
17
VDD
18
CLK
19
DO2
20
VH
21
GND
22
VH
23
GND
24
VH
25
GND
26
JP9
ROHM
VH
1
VH
2
VH
3
GND
4
GND
5
GND
6
GND
7
VCC
8
TM
9
TM
10
DO
11
NC
12
STB2
13
STB1
14
CLK
15
/LAT
16
NC
17
DI
18
JP10
KYOCERA
DI
/LAT
CLK
VCC
VCC
C20
0.1u
C21
0.1u
R37
20K
R38
51
Z1
4.7V
A
1
B
2
CLR
3
Q
4
Q
13
Cext
14
RCext
15
U12A
74HC123
R39
150K
VCC
12
13
U5F
74HC04
PH_HEAT
8
9
10
U9C
74HC08
11
12
13
U9D
74HC08
HISTORY
Q1
HSC945
Q2
2SJ177
Q3
2SJ177
Q4
2SJ177
Q5
2SJ177
VDD
R21
10K
R42
10
R22
10K
R43
1K
PH
STROBE1
STROBE2
STROBE1
STROBE2
TM
R44
3.9K
R48 1K
Vdet
1
2
3
J1
200DPI
STROBE1
300DPI
1
2
3
200DPI
300DPI
PH_GND
是印字頭系統接地部份
DIGITAL GND
是數位系統部份接地
PVDD
是印字頭部份電源
DIGITAL GND
8
9
U5D
74HC04
1
2
3
U9A
74HC08
/RESET
VH_POWER
VH_POWER
C22
10u\TANT
Z2
IN4745\16V
VH_POWER MAX CURRENT IS 18A/1KHz
Analog Ground
Analog Ground
Analog Ground
Analog Ground
Analog Ground
C79
300p
C80
220p
MOTOR_GND
Fig. 3.9 Thermal Head Drive/ Protection and History Control Circuit
This is the thermal head drive/protection and history control circuit. CLK and /LAT
connected to thermal head control clock and data latch respectively. PH controls the
DC24V voltage of the thermal head. When PH is “LOW”, the thermal head will be
separated from 24V (V
DD
). PH_HEAT determines whether to heat the thermal head or
not. HISTORY determines the history control is available or not. DI sends the printer
data to the print head. TM is the temperature/voltage sensor for thermal head. Vdet
feeds back the voltage and compensates the heat time for voltage accuracy when
printing.
Содержание TDP-243 Series
Страница 1: ...TTP TDP 243 342 SERVICE MANUAL THERMAL TRANSFER DIRECT THERMAL BAR CODE PRINTER...
Страница 13: ...10 TTP 243 Bar Code Printer Service Manual...
Страница 17: ...14 TTP 243 Bar Code Printer Service Manual Fig 3 2 System Block of PCB...
Страница 54: ...51 TTP 243 Bar Code Printer Service Manual TTP 243 Last Update 2003 2 18...
Страница 56: ...53 TTP 243 Bar Code Printer Service Manual TTP 243 Last Update 2003 2 18 12...
Страница 58: ...55 TTP 243 Bar Code Printer Service Manual TTP 243 Last Update 2003 2 18...
Страница 60: ...57 TTP 243 Bar Code Printer Service Manual TTP 243 Last Update 2003 2 18...
Страница 62: ...59 TTP 243 Bar Code Printer Service Manual TTP 243 Last Update 2003 2 18...