Intermec EasyCoder 301 – Service Manual Ed. 3
43
Chapter 11
11. CPU Board
11.1 Description
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.
Static
EC000
Core
System
Integration
Module (SIM)
In-Circuit
Emulation
Parallel Port
DMA
Clock
MA0–MA9
MD0–MD15
A0–A18
Video
CMD
CMD
Centronics
U19 – U9
Output
UART
16C550
RS-232
PIC
U15
Sensors
PCMCIA
Card
TPH
Controller
Stepper
Driver
(256K x 16) x 2
FLASH
256K x 16
DRAM
DMA
Bus Interface
Unit
DRAM
Control
RISC Graphic
Processor
(RGP)
Graphics Execution
Unit (GEU)
Print Engine
Video Controller
(PVC)
Card Control
Sensors In
Head In
Card Select
U26
PIC
U14
U10
Block diagram of the logics part of the CPU board.
Refer to chapter 11.8 for detailed schematics.
