TTP-248M Bar Code Printer
Service Manual
3.9 Print Head |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
| VDD |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| JP18 A |
|
|
|
|
|
|
|
|
|
|
|
| U8D |
|
|
| VDD | ROHM_ KF20 04_ GL41 A | |
|
| VDD | BC3 3 |
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
| 0. 1u F |
|
|
| CLK |
|
| 9 |
| 8 |
|
|
| 2 | Vdd |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 4 | ||
|
|
|
|
|
|
|
|
|
| U8C |
|
|
|
|
|
| Vdd | |
R44 | R45 | R46 | R47 | GND |
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
| 74 HCT1 4 |
|
|
|
|
| ||||||
10 K | 10 K | 10 K | 10 K |
|
|
|
|
| 5 |
| 6 |
|
|
| 6 |
| ||
|
|
|
| /LAT |
|
|
|
|
|
| CLK | |||||||
|
|
| 74 LS14 CONNECT BY VDD |
|
|
|
|
|
|
|
|
| 10 | |||||
|
|
|
|
|
|
|
| U8E |
|
|
|
| /LAT | |||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
| U7A |
| DI1 |
| 74 HCT1 4 | 11 |
| 10 |
|
|
| 19 | DI1 |
|
|
|
|
| 1 |
| 2 |
| U8F |
|
|
|
|
|
| 20 | ||
STB1 |
|
|
|
| U7B |
|
| 13 |
| 12 |
|
|
|
|
| 15 | DO1 | |
|
|
|
|
|
| 4 74 HCT1 4 | DI2 |
| U8A | 74 HCT1 4 |
|
| DI2 | |||||
STB2 |
|
|
| 3 |
| 74 HCT1 4 |
|
|
|
| 16 | |||||||
|
|
| U7C |
|
|
|
|
| 1 |
| 2 |
|
|
| 13 | DO2 | ||
|
|
|
|
|
| 6 74 HCT1 4 |
| DI3 |
| U8B |
|
|
|
| DI3 | |||
STB3 |
|
|
| 5 |
|
|
|
|
|
|
|
|
| 14 | ||||
|
|
| U7D |
|
|
|
| 3 |
| 4 |
|
|
|
|
| 7 | DO3 | |
|
|
|
|
| 74 HCT1 4 |
| DI4 |
| 74 HCT1 4 |
|
|
| DI4 | |||||
|
|
| 9 | 8 |
|
|
|
|
|
|
| 8 | ||||||
STB4 |
|
|
|
|
|
|
|
|
|
|
|
|
|
| DO4 | |||
|
|
|
|
|
|
|
|
|
|
|
|
|
| AVCC |
|
| ||
|
|
|
|
|
|
|
|
|
| 74 HCT1 4 |
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 11 |
| |
|
|
|
| 74 HCT1 4 |
|
|
|
|
|
|
|
|
|
|
|
| TM | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 12 | ||
|
|
|
|
|
|
|
| TM |
|
|
|
|
|
|
|
| TM | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| R107 | STORBE1 18 | STB1 | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 22 K | STORBE2 17 | ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| STB2 | |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| STORBE3 | 9 | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| STB3 | ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| STORBE4 | 5 | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| STB4 | ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 3 | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| R108 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 6. 2K | GND |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| JP18 B |
|
|
|
|
|
|
|
| Vdet | Vdet |
|
|
|
|
|
|
| 1 | VH |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 2 | ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| VH | |
|
|
|
|
|
|
|
|
|
|
|
|
| Z1 | R15 | 1K |
| 3 | |
|
|
|
|
|
|
|
|
|
|
|
|
|
| VH | ||||
|
|
|
|
|
|
|
|
|
| VMM |
|
|
|
|
|
| 4 | |
|
|
|
| R48 |
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
| 3. 3V |
|
|
| 5 | ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
| 10 K |
|
|
|
|
|
|
|
|
|
|
|
| 6 | |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
| Q7 |
|
|
|
|
|
|
|
|
| AGND |
| |
ANALOG GND
| R109 |
|
/RESET_ PH | 8. 2 | IRF4 905 |
| ||
|
| Q8 |
| R16 |
|
| 1K |
|
| Q6 |
|
| HSC945 | IRF4 905 |
| R49 | |
|
| |
| 10 K |
|
C62C79
ANALOG GND AGND | 22 00 uF |
AGND
22 00 uF
Fig. 3.7 Print Head (ROHM KF2004-GL41B)
Print Head Sensor
The voltage of sender is about 1.18V (1.17V~1.19V)
28
