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FACSIMILE SYSTEM
1. INTRODUCTION
This chapter describes the functions of the main printed circuit boards used
on a facsimile.
Mainly, the following printed circuit boards are used:
Generally, these printed circuit boards are connected mainly to the SCNT
board.
In addition to these printed circuit boards, there are also the PCNT board
and driver board. The PCNT board supplies high voltage for driving LBP
printers, and the driver board groups together the
various motors on a BJ printer. These boards are sometimes integrated into
a single board depending on the model of facsimile or sometimes not pro-
vided on the facsimile.
6–2
• SCNT board for controlling the entire facsimile system
• NCU board that acts as the facsimile's interface with the telephone
line
• OPCNT board that performs detection of button operations or LCD
display
• Power supply unit that supplies the required voltages to each of the
printed circuit boards from the AC power supply for household use
• G4CNT board that controls the G4 facsimile communications system
Power supply
unit
To power outlet
OPCNT
DRIVER
board
board
SCNT board
Fig. 6-1 Wiring Diagram
driver ICs
for driving the
PCNT
board
NCU board
Telephone line
or
G4CNT board
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