Description - Intermec EasyCoder 301 Service Manual

11. CPU Board

11.1 Description

Clock Centronics
Static
Parallel Port
EC000
Core
System
Integration Bus Interface
Module (SIM)
In-Circuit DRAM
Emulation Control
MA0–MA9 MD0–MD15
256K x 16 (256K x 16) x 2
DRAM FLASH
Intermec EasyCoder 301 – Service Manual Ed. 3
The CPU board contains almost all of the printer's electronic
circuitry including the serial and parallel communication ports, the
power supply, the memory card adapter, the cutter and wand
interfaces and the headlift sensor. In addition, an optional real-time
clock circuit (RTC) can be fitted in a socket.
The CPU board should be regarded as a complete replaceable unit.
Do not attempt to carry out any repairs or modifications to the CPU
board other than those described in this manual.
Warning
When working on the CPU board, take precautions to prevent
electrostatic discharges and use non-conductive tools to avoid
short-circuits.
Do not replace a blown fuse! If a fuse blows, a serious fault has
occurred and the entire CPU board should be replaced.
Graphics Execution
Unit (GEU)
DMA
RISC Graphic
Processor
(RGP)
DMA
Unit
Print Engine
Video Controller
(PVC)
A0–A18
Block diagram of the logics part of the CPU board.
Refer to chapter 11.8 for detailed schematics.
Card Control
Sensors In
Card Select Head In
U26 U19 – U9
CMD CMD
PIC
U15
Video
TPH Stepper
Controller Driver
Chapter 11
RS-232
UART
Output
16C550
PIC
U10
U14
Sensors
PCMCIA
Card
43