Brother International FAX-170 Service Manual - Page 46

Control, Panel

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3.4 Control Panel PCB The control panel PCB and the main PCB communicate with each other by serially transmitting commands and data. The control panel unit consists of a gate array and LCD, which are controlled by the gate array according to commands issued from the FAX engine on the main PCB. The calendar clock is backed up by the backup circuit on the main PCB. The panel FPC is a flexible keyboard PCB which integrates the key matrix having rubber keyto ps. FAX Engine Main PCB i Control Panel PCB i +5V Backup Circuit SDIN SDOUT PCLK }Serial > Communications > Ports Gate Array I/O Ports . +5V POWER Reset Circuit > RESET LCD Panel FPC (Key Matrix) Control Panel PCB and its Related Circuit III - 34

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3.4
Control
Panel
PCB
The
control
panel
PCB
and
the
main
PCB
communicate
with
each
other
by
serially
transmit-
ting
commands
and
data.
The
control
panel
unit
consists
of
a
gate
array
and
LCD,
which
are
controlled
by
the
gate
array
according
to
commands
issued
from
the
FAX
engine
on
the
main
PCB.
The
calendar
clock
is
backed
up
by
the
backup
circuit
on
the
main
PCB.
The
panel
FPC
is
a
flexible
keyboard
PCB
which
integrates
the
key
matrix
having
rubber
keyto
ps.
Main
PCB
i
Control
Panel
PCB
FAX
Engine
SDIN
SDOUT
PCLK
+5V
>
>
i
+5V
Backup
Circuit
Reset
Circuit
>
}
Serial
Communications
Ports
Gate
Array
POWER
RESET
I/O
Ports
.
LCD
Control
Panel
PCB
and
its
Related
Circuit
Panel
FPC
(Key
Matrix)
III
-
34