A SERVICE OF

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PRINCIPLES OF OPERATION
1. Block Diagram
The following diagram illustrates the relation between the main logic board and its peripherals.
Fig. 2-1 Block Diagram
Host computer
Host computer
Parallel I/F
Main Logic Board
RS232C I/F
Gate array
CPU
EEPROM
Head driver
Lamp
Dipswitch
Motor driver
Cutter driver
Sensor circuit
EPROM
256K × 8 bits
PSRAM
128K × 8 bits
Kanji ROM
512K × 8 bits
Peripheral unit
driver
Switch
Thermal
head
Printer mechanism
Paper-feed
motor
Auto-cutter
Sensor
Peripheral unit
5V 24V
Power supply unit