Brother International HS-5300 Service Manual - Page 30

Engine, Driver, FAN_HIGH, Motor, ASIC3, C_FAN

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1.4.7 Fan Drive Circuit The fan drive circuit controls the rotation speed of the fan motor. The fan can rotate at high speed, low speed or stopped by the combination of the FAN_HIGH and FAN_LOW signals output from the engine CPU. The relationship between the signals and rotation speed are shown in the table below. FAN _ HIGH High Low Low FAN _ LOW Low High Low Rotation speed High Low Stop Fig. 2.10 Main PCB i Driver PCB +25V 0 Engine CPU FAN_HIGH FAN LOW Driver P6 Fan Motor Fig. 2.11 1.4.8 PS Fan Motor Drive Circuit The PS fan motor drive circuit controls the rotation of PS fan motor to cool down the power supply unit. It is controlled by the C_FAN signal output through the Jet ASIC3 from the engine CPU which controls the fan rotation and stop. The motor starts rotating when the signal is high and stops when the signal is low. Engine CPU Main PCB i 0. Jet C_FAN ASIC3 Driver PCB +25V 0 P19 Driver PS Fan Motor Fig. 2.12

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1.4.7
Fan
Drive
Circuit
The
fan
drive
circuit
controls
the
rotation
speed
of
the
fan
motor.
The
fan
can
rotate
at
high
speed,
low
speed
or
stopped
by
the
combination
of
the
FAN_HIGH
and
FAN_LOW
signals
output
from
the
engine
CPU.
The
relationship
between
the
signals
and
rotation
speed
are
shown
in
the
table
below.
FAN
_
HIGH
FAN
_
LOW
Rotation
speed
High
Low
High
Low
High
Low
Low
Low
Stop
Engine
CPU
Fig.
2.10
Main
PCB
i
Driver
PCB
FAN_HIGH
FAN
LOW
Fig.
2.11
1.4.8
PS
Fan
Motor
Drive
Circuit
Driver
+25V
0
P6
Fan
Motor
The
PS
fan
motor
drive
circuit
controls
the
rotation
of
PS
fan
motor
to
cool
down
the
power
supply
unit.
It
is
controlled
by
the
C_FAN
signal
output
through
the
Jet ASIC3
from
the
engine
CPU
which
controls
the
fan
rotation
and
stop.
The
motor
starts
rotating
when
the
signal
is
high
and
stops
when
the
signal
is
low.
Engine
CPU
Main
PCB
i
Driver
PCB
0.
Jet
ASIC3
C_FAN
Fig.
2.12
Driver
+25V
0
P19
PS
Fan
Motor