Sony DNW-A220, Руководство по обслуживанию, Страница: 21 / 190

1-13
DNW-A220
DNW-A220P
1
Tape top sensor
Detects the end of the tape running in the reverse direction.
2
Function cam sensor
Detects the rotation position of the cam.
3
T reel table FG sensor
Detects the rotation speed of the T reel table. In addition, the sensor output FG is sent to the
servo circuit to calculate the diameter of wound tape and to discriminate the abnormality of the
T reel table rotation.
4
Cassette compartment lock sensor
Detects whether the cassette compartment is locked or not.
5
Oxide/Metal sensor
Detects the metal tape detection tab of a cassette to discriminate whether the tape stored in a
Betacam/Betacam SP cassette is an oxide or metal particle tape.
6
Tape thickness sensor
Detects the tape thickness detection tab of a cassette to discriminate the thickness of the tape
stored in a cassette.
7
Reel hub diameter sensor
There are two kinds of hubs (thin or thick in diameter) according to the length of a tape stored in
a cassette. This sensor detects the reel hub diameter detection tab of a cassette to discriminate
which hub is used in a cassette. The output of the sensor is sent to the servo circuit of the S reel
motor to control the reel rotation speed and torque during tape running.
8
Cassette classification sensors
Detect the three cassette classification detection tabs of a cassette to discriminate whether an
inserted cassette can be used for the unit.
9
S tension regulator arm sensor
Detects the position of the S tension regulator arm. The output of the sensor is sent to the S reel
motor servo circuit to control the reel torque to keep a constant S tape tension during recording
and playback.
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REC inhibit sensor
Detects the state of the REC inhibit plug of a cassette.
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Tape end sensor
Detects the end of the tape running in the forward direction.
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Condensation sensor
Detects whether the dew condensation occurs in the unit or not.
1-4. Location of Main Parts and Circuit Function