2-15
DNW-A22/A22P
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Cassette classification sensors
These sensors detect the three cassette type detection
tabs of a cassette.
These sensors are used to discriminate whether a
cassette can be used in this unit.
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T reel table FG sensor
This sensor detects the rotation speed of the take-up
reel motor.
The output signal of this sensor enters the reel motor
servo circuit, and controls the reel table rotation speed.
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Reel S position sensor
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Reel L position sensor
These sensors detect whether the reel table moves to
the correct position according to the size of the
inserted cassette.
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S reel table FG sensor
This sensor detects the rotation speed of the supply
reel motor.
The output signal of this sensor enters the reel motor
servo circuit, and controls the reel table rotation speed.
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S tension regulator arm sensor
This sensor detects the position of an S tension
regulator arm.
During playback, the output signal of this sensor enters
the S reel motor servo circuit, and controls the reel
torque to keep a constant S tape tension.
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Tape end sensor
This sensor detects the end of the tape that runs in the
forward direction.
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Cassette -in sensor (L)
This sensor detects whether a cassette is being insert-
ed.
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Cassette size sensor
This sensor detects whether the inserted cassette is L
size or S size.
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Cassette-in sensor (R)
This sensor detects whether a cassette is being insert-
ed.
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Cassette-down (2) sensor
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Cassette-down (1) sensor
These sensors detect the movement (position) of a
cassette compartment by the combination of the
detection state of the two sensors and a cassette-in
sensor.
2-9. Function and Location of Sensors
1
Threading motor FG sensor
This sensor detects the rotation speed of the threading
motor.
The output signal of this sensor enters the threading/
unthreading motor servo circuit, and controls the
threading/unthreading speed to protect the tape
damage during threading/unthreading operation.
2
Unthreading-end sensor
3
Threading-end sensor
These sensors detect whether the threading ring
reaches the threading-end or unthreading-end position.
4
T tension regulator arm sensor
This sensor detects the position of a T tension regula-
tor arm.
During playback, the output signal of this sensor enters
the T reel motor servo circuit, and controls the reel
torque to keep a constant T tape tension.
5
Condensation sensor
This sensor detects whether the dew condensation
occurs in the unit.
6
Tape top sensor
This sensor detects the beginning of the tape, and in
addition detects the end of the tape that runs in the
reverse direction.
7
Reel hub diameter sensor
This sensor detects the reel hub diameter detection tab
of a cassette.
The reel hub with two types of diameters (thin and
thick) is available according to the length of a tape
stored in a cassette.
This sensor is used discriminate the diameter. The
output signal of this sensor enters the servo circuit of
take-up and supply reel motors, and controls the reel
rotation speed and torque during tape transport.
8
Metal/oxide tape sensor
This sensor detects the metal tape detection tab of a
Betacam/Betacam SP cassette.
This sensor is used to discriminate whether the tape
stored in a Betacam/Betacam SP cassette is an oxide
tape or metal particle tape.
9
Tape thickness sensor
This sensor detects the tape thickness detection tab of
a cassette.
This sensor is used to discriminate the thickness of the
tape stored in a cassette.
