Brother International MFC-7050C Service Manual - Page 29

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3.5 Power Supply PCB The power supply uses the switching regulator to generate DC power (+30V and +5V) from a commercial AC power line. Both the +30V and +5V DC supplies are fed via the interface PCB to the main PCB. The +30V source is stabilized and fed to the scanner motor (for advancing documents), paper feed motor (for feeding documents and recording paper), carrier transport motor (for moving the carrier), thermal ink-jet print heads, and LED array of the CIS unit. The +5V source is stabilized and fed to the ASIC, Centronics interface circuit, memories, and video IC. Fuse Lightning surge absorber Feedback Line filter Rectifier Oscillator 30V regulation circuit Transformer 5V regulation circuit Interface PCB 30V 0 5V Power Supply Circuit III - 18

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3.5
Power
Supply
PCB
The
power
supply
uses
the
switching
regulator
to
generate
DC
power
(+30V
and
+5V)
from
a
commercial
AC
power
line.
Both
the
+30V
and
+5V
DC
supplies
are
fed
via
the
interface
PCB
to
the
main
PCB.
The
+30V
source
is
stabilized
and
fed
to
the
scanner
motor
(for
advancing
documents),
paper
feed
motor
(for
feeding
documents
and
recording
paper),
carrier
transport
motor
(for
moving
the
carrier),
thermal
ink
-jet
print
heads,
and
LED
array
of
the
CIS
unit.
The
+5V
source
is
stabilized
and
fed
to
the
ASIC,
Centronics
interface
circuit,
memories,
and
video
IC.
Fuse
Lightning
surge
absorber
Feedback
Line
filter
Rectifier
Oscillator
Transformer
Interface
PCB
30V
regulation
circuit
5V
regulation
circuit
Power
Supply
Circuit
III
-
18
30V
0
5V