Brother International MFC-7050C Service Manual - Page 27
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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. LINE EXTERNAL TELEPHONE HANDSET Surge absorber Dial pulse generator Line relay \ .(.O. ML relay) Loop current detector CTelephone circuit Line transformer MAIN PCB High-impedance transformer > MAIN PCB Calling signa detector MAIN PCB MAIN PCB Surge absorbers Diode bridge Transformer Relay Modular jacks Photocouplers Transformer Amplifier III - 16
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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.
LINE
EXTERNAL
TELEPHONE
HANDSET
Surge
Dial
pulse
Line
relay
absorber
generator
\
(
...
OML
relay)
Modular
jacks
Loop
current
detector
C
Telephone
circuit
Line
transformer
High-impedance
transformer
Calling
signa
detector
Surge
absorbers
Diode
bridge
Transformer
Relay
Photocouplers
Amplifier
III
-
16
MAIN
PCB
>
MAIN
PCB
MAIN
PCB
MAIN
PCB
Transformer