Theory Of Operation; Block Diagram - Star Micronics TSP400 Series Technical Manual

1. Block Diagram

The following diagram illustrates the relationship between the control board (main PCB) and its peripherals.
Data flow (Host computer)
Interface board
RS232C, RS422A, or parallel
(8)
Control
panel
Gate array
(16)
EPROM
128K 16bits
(16)
PS-RAM
128K 16bits
(8)
S-RAM (backup)
8K 8 bits
(16)
Kanji ROM
256K 16 bits
CPU
DC-DC converter
24V
Power unit
Fig. 2-1 Block Diagram

THEORY OF OPERATION

Main PCB
EEPROM
Head driver
Motor driver
Cutter driver
Sensor circuitry
External device
driver
– 19 –
Printer mechanism
Thermal
head
Feed motor
Autocutter
Sensor
External
device