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Service Guide OF2200/2400/2600
Chapter A Board Diagrams
A.2.01 Main Control Board (MCNT-250) Okifax 2200
Function
The main control board contains an IC that provides voice answering in the TEL/FAX Mode in accordance
with the INPUT/OUTPUT Gate Array and the microprocessor. This board converts parallel send data to
serial data, converts serial receive data to parallel data, modulates/demodulates data, and generates
multi-frequency signals for tone dialing. It amplifies signals and sends the amplified signals to a speaker.
The main control board houses an 8 MHz Microprocessor, static RAM, ENCODER/DECODER, and a
modem IC. This board also monitors the status of the PC1, PC2, and B4 photosensors.
Firmware
ROM: 512 Kbytes
Contains Print Control Program
Location on board designated by "ROM"
Fuses
NONE
Jumpers
NONE
Sensors
NONE
Switches
SW1
Used to modify the LED Head Drive Time.
Test Points
CN 5 Pin 1: GROUND
CN 5 Pin 13: +5 vdc
CN 5 Pin 14: +12 vdc
CN 5 Pin 15: -12 vdc
CN 12 Pin 2, 5, 8, 11: +5 vdc
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