UBI EasyCoder 501 – Service Manual
109
17. CPU BOARD, cont'd.
17.2
Overview
This section describes the CPU board 1-040700-30 based on the
printed circuit board 1-040700-10.
The CPU board is manufactured in the multi-layer technique,
where +5V and +5V GND have separate layers inside the board.
The CPU board contains both logic and power supply hardware.
The logic hardware on the CPU board supports the following
functions:
• Stepper motor controls
• Data supply to thermal printhead
• Data measurements (e.g. printhead temperature and voltage)
• PROM for program, formats and character generators
• RAM for formats and images
• Inputs/outputs and communication
The CPU board is equipped with two processors, IC-07 and IC-402,
the former of which is a 32CG16 that has an overall control of
printer activities, whereas the latter is an HPC 16083M that operates
as a slave processor.
CPU
32CG16
MEMORY
DECODER/
WAIT STATE
GENERATOR
SENSORS/
BUZZER
INPUTS/
OUTPUTS
TIMERS
THERMAL
PRINTHEAD
CONTROL
STEPPER
MOTOR
CONTROL
SLAVE
PROCESSOR
HPC16083
INTERRUPT
CONTROLLER
RTC
DMA/
CONVERTER
(PARALLEL TO
SERIAL)
SRAM /
PROM
KEYBOARD/
DISPLAY
I/O-BOARD
BUS
UART1:
THERMAL
PRINTHEAD
STEPPER
MOTORS
Continued!
