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Part 4: Technical Reference
4. PRINTER ELECTRICAL SYSTEM
4.1 Overview
The electrical system functions are handled by the logic section (logic board, carriage
board, carriage driver board, etc.) and the power supply section (power supply unit).
The logic section converts the data from the interface into print signals and printer
operation signals, and drives the BJ cartridges and all the motors while monitoring the
status of the sensors.
The power supply section converts the DC input power from the power supply unit into
drive power for the logic board, motors, BJ cartridges, etc.
When DC power is input from the power supply unit, all of the hardware components
are active except for the following which are inactive:
• all buttons except the POWER button
• photo-interrupter's sensor
• interface input signals.
Carriage Motor
Purge Motor
Carriage Board
Purge Sensor
Photo-interrupter
Carriage Driver Board
Power Supply Unit
Figure 4-36 Printer Electrical Section
Logic Board
Serial Interface
Parallel Interface
Paper Feed Motor
4-36
BJC-8500
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