Brother International FAX-170 Service Manual - Page 47

Power, Supply

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3.5 Power Supply PCB The power supply uses the switching regulation system to generate DC power (+26.6V and +8V) from a commercial AC power supply. The +26.6V source is stabilized and fed to the motor and solenoid for feeding documents and recording paper or activating the automatic cutter, and also fed to the CIS LED array. It is also fed to the main PCB where the H26.6V source is generated. The H26.6V source outputs 26.6V only when the H26.6V ON/OFF control signal is High, for driving the recording head. The +8V source is not stabilized and fed to the speaker. It is also fed to the main PCB where the 3-terminal regulator eliminates unstabilized components of the +8V source to generate stabilized +5V source. The +5V source is fed to the logic, control panel, and sensors. Commercial AC Power Line Fuse Lightning Surge Absorption Circuit Link Filter Rectifier Circuit v Oscillator Circuit Output Feedback 0 0 0 0 0 0 c> 0 0 0 , --0- 0 0 0 0 0 26.6 V Output Circuit 8V Output Circuit Main PCB o H26.6V ON/OFF Control Signal H26.6V Output Circuit a H26.6V 26.6 V O 8 V Power Supply Circuit III - 35

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3.5
Power
Supply
PCB
The
power
supply
uses
the
switching
regulation
system
to
generate
DC
power
(+26.6V
and
+8V)
from
a
commercial
AC
power
supply.
The
+26.6V
source
is
stabilized
and
fed
to
the
motor
and
solenoid
for
feeding
documents
and
recording
paper
or
activating
the
automatic
cutter,
and
also
fed
to
the
CIS
LED
array.
It
is
also
fed
to
the
main
PCB
where
the
H26.6V
source
is
generated.
The
H26.6V
source
out-
puts
26.6V
only
when
the
H26.6V
ON/OFF
control
signal
is
High,
for
driving
the
recording
head.
The
+8V
source
is
not
stabilized
and
fed
to
the
speaker.
It
is
also
fed
to
the
main
PCB
where
the
3
-terminal
regulator
eliminates
unstabilized
components
of
the
+8V
source
to
generate
stabilized
+5V
source.
The
+5V
source
is
fed
to
the
logic,
control
panel,
and
sensors.
Fuse
Commercial
AC
Power
Line
Main
PCB
H26.6V
ON/OFF
Lightning
Surge
Absorption
Circuit
Link
Filter
Rectifier
Circuit
o
Control
Signal
a
H26.6V
H26.6V
Output
Circuit
Output
Feedback
v
Oscillator
26.6
V
0
0
0
0
26.6
V
Circuit
0
0
0
c>
0
Output
0
0
,
--0-
Circuit
0
0
0
0
8V
O
8
V
Output
Circuit
Power
Supply
Circuit
III
-
35