Part 1: Facsimile
d) Printer control section (On the PCNT board)
d-l) Printer controller (IC 5)
The main functions of the printer controller are as follows:
Print head control
d-2) MPU (IC 1)
24 bit address bus
16 bit data bus
Carriage motor I 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 S-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.
Ink detection sensor control
d-3) ROM (IC
The 8 Mbit control/CC ROhl cnntains the program and bitmap font data for printer
d-4) DRAM (IC 4)
d-5) EEPROM (IC 8)
Controlled by the printer wntn~llrr, thr 1 Kbit ERPROM iElectrically Erasable and
Programmable ROM) stores vnri"us printer ewluli~tion wttings, and the waste ink amount
discharged to the waste ink absorber.