d) Printer control section (On the PCNT board)
d-1) Printer controller (IC 5)
The main functions of the printer controller are as follows:
• Bi-centronics interface
• EEP-ROM control
• DRAM control
• Buffer control
• Print head control
d-2) MPU (IC 1)
• 16 bit CPU
• 24 bit address bus
• 16 bit data bus
• Carriage motor / Line feed motor control
The stepping motor controller outputs the carriage motor's single- and two-phase exciter drive signal,
and paper feed motor's two-phase drive signal.
The stepping motor controller switches the carriage motor with the 5-step peak current value for
optimum driving. The stepping motor controller outputs the switching control signal to the carriage
motor driver.
• Detection of BJ head temperature
• Detection of printer's internal temperature.
• Detection of Home position sensor, Paper edge sensor and Pickup roller sensor.
• Cartridge detection.
• Ink detection sensor control
d-3) ROM (IC 3)
The 8 Mbit control/CG ROM contains the program and bitmap font data for printer control.
d-4) DRAM (IC 4)
4 Mbit DRAM is used as the receive buffer, download buffer, print buffer, and working area.
d-5) EEPROM (IC 8)
Controlled by the printer controller, the 1 Kbit EEPROM (Electrically Erasable and Programmable
ROM) stores various printer emulation settings, and the waste ink amount discharged to the waste ink
absorber.
Part 1: Facsimile
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Summary of Contents for MultiPASS C50
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