Brother International FAX-170 Service Manual - Page 39

mechanism.

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® Transistor array which consists of seven transistors ®-1: Transistors that control the rotation direction of the motor according to the MM4 through MM1 signals. ®-2: Transistor that turns on and off the solenoid. The combination of the solenoid state and the motor rotation direction determines to which the motor torque should be transmitted, the cutter, the document feeding mechanism, or the paper feeding mechanism. ®-3: Transistor that turns on and off the CR1 relay for switching on and off the +26V power source to the thermal recording head. ®-4: Transistor that turns on and off the CML relay. ® Document front and rear sensor circuitry that is active only while the SEAN signal is on. The LEDs for the sensors are driven by the +26V source. ®-1: PH1, document rear sensor ®-2: PH2, document front sensor III - 27

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®
Transistor
array
which
consists
of
seven
transistors
®-1:
Transistors
that
control
the
rotation
direction
of
the
motor
according
to
the
MM4
through
MM1
signals.
®-2:
Transistor
that
turns
on
and
off
the
solenoid.
The
combination
of
the
solenoid
state
and
the
motor
rotation
direction
deter-
mines
to
which
the
motor
torque
should
be
transmitted,
the
cutter,
the
document
feeding
mechanism,
or
the
paper
feeding
mechanism.
®-3:
Transistor
that
turns
on
and
off
the
CR1
relay
for
switching
on
and
off
the
+26V
power
source
to
the
thermal
recording
head.
®-4:
Transistor
that
turns
on
and
off
the
CML
relay.
®
Document
front
and
rear
sensor
circuitry
that
is
active
only
while
the
SEAN
signal
is
on.
The
LEDs
for
the
sensors
are
driven
by
the
+26V
source.
®-1:
PH1,
document
rear
sensor
®-2:
PH2,
document
front
sensor
III
-
27