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DETAILED SECTION DESCRIPTIONS
PCBs
2.3.3. IJC
Ink End Sensor
Top Cover Sensor
Front Cover Sensor
Paper Release Lever
Sensor
OPU
1. CPU (MPU)
Printer head control
Carriage motor control
Paper feed motor control
Centronics interface control
Data converter for the character font code
2. Printer controller
Printer head drive control
Centronics interface control
3. ROM
8 bit masked ROM for the TIJ (thermal ink jet) control program and bit
map font data storage
4. DRAM
1 MB DRAM for working area, receive data buffer, and font download
buffer
Centronics
Interface
EEPROM
Printer Controller
FCE
DRAM
LED Driver
NCU
RIDC
ROM
HIC
Contact Image
Sensor
Speaker
2-20
November 28th, 1995
IJC
SRAM
FDU
CPU
H505D517.wmf
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