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Service Manual for OF5800
Chapter 2 Machine Operations
The main control PCB controls the operations of all machine functions. Jumper JP1 on the main control
PCB controls the data memory back-up. Memory data that is backed-up in the event of a power failure
includes any stored documents.
Jumper JP2 on the main control PCB controls the programmable data memory back-up. Memory data that
is backed-up in the event of a power failure includes user programmed information such as the date, time,
TTI, autodialer, memory switches, etc. If the Passcode is forgotten, removing JP2 will clear all User
Settings.
NOTE:
JP1, JP2, should remain in the "ON" position at all times. Be sure to check this on all replacement
boards.
Main control PCB block diagram
The main control unit controls all function of the machine. Following are its components:
Fax Engine
CPU --
The CPU is the core of the control section. It controls all other sections.
Scanner Control
--- Processes the signal from the Charge Coupled Device (CCD).
Modem -
-- The modem facilitates modulation and demodulation of data for fax communication.