Brother International FAX 275 Service Manual - Page 31
switches, communications, telephone, built-in, MODEM, under, control, U.S.A., versions
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UPC - 012502564546
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3.3 NCU PCB The NCU PCB switches the communications line to telephone or built-in MODEM, under the control of the main PCB. U.S.A. versions LINE Surge absorber .... EXTERNAL , TELEPHONE HANDSET Dial puls.e--N generator Line relay (CML relay) Ene transformer > MAIN PCB Loop current detector Telephone circuit High-impedance transformer CCalling signal detector > MAIN PCB MAIN PCB > MAIN PCB Surge absorbers Diode bridge Transformer Relay 0 / -11 2 _II_I Transformer Modular jacks Photocouplers Amplifier III - 20
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3.3
NCU
PCB
The
NCU
PCB
switches
the
communications
line
to
telephone
or
built-in
MODEM,
under
the
control
of
the
main
PCB.
U.S.A.
versions
LINE
.--
N
Surge
Dial
pulse
Line
relay
absorber
generator
(CML
relay)
EXTERNAL
,
Loop
current
....
TELEPHONE
detector
HANDSET
Telephone
circuit
Modular
jacks
Ene
transformer
High
-impedance
transformer
C
Calling
signal
detector
Surge
absorbers
Diode
bridge
0
/
—1
1
2
_II_I
Transformer
Relay
Photocouplers
Amplifier
>
MAIN
PCB
>
MAIN
PCB
MAIN
PCB
>
MAIN
PCB
Transformer
III
-
20