THEORY OF OPERATION
1. Block Diagram
The following diagram illustrates the relationship between the control board (main PCB) and its peripherals.
Control panel
Data flow (Host computer)
Interface board
RS232C, RS422A, or parallel
Main PCB
| Gate array |
| EEPROM |
(8) | (16) |
|
|
| EPROM |
| Head driver |
| 128K × 16bits | ||
|
| ||
| (16) |
|
|
|
|
| Motor driver |
| 128K × 16bits | ||
|
| ||
| (8) |
|
|
| Cutter driver | ||
| 8K × | 8 bits | |
|
| ||
| (16) |
|
|
| Kanji ROM |
| Sensor circuitry |
| 256K × 16 bits | ||
|
| ||
| CPU |
| External device |
|
|
| driver |
|
|
| |
|
| 24V |
|
Printer mechanism
Thermal head
Feed motor
Autocutter
Sensor
External
device
Power unit
Fig. 2-1 Block Diagram
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