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1. MECHANISM CONTROL
The mechanism includes its own mode as well as the operation mode of the VCR as shown in the chart below. This mode serves
an important function in working to protect the tape by passing through the VCR when the mode is switched over.
The movement of the mechanism mode is performed by the control signal of the loading motor's rotary control circuit. With this
control, the operation mode position is detected by the Mode switch (4-bit mode data output), Cassetle In switch, tape top sensor
and the tape end semsor which detects all modes of the mechanism.
1-1. MODE SW
The composition of the 4 terminals, COM DATA 1, 2, 3, 4, are treated as a 4 bit signal.
POSITION NO
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1-2. CONFIGURATION OF THE
1-2-4. Motor
TN6500 VCR MECHANISM
(A) Capstan Motor
:
:
The
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1-2-1. Cassette Drive
Mechanism
e drives the capstan axle directly and also drives the reel
that has been loaded on the belt. This motor is also used to
drive the cassette loading mechanism.
|
.
)
(В) Tape Loading Motor
(A) Detection of cassette insertion
In addition to cassette loading/unloading, this motor also
When an cassette is inserted, the capstan motor starts and
Switched between the various operating modes(PLAY, FF/
simultaneously causes the shutter on the main unit to break the light
REW etc. )
The cassette is loaded and ejected via the drive from the
capstan motor.
(B) Detection of completed cassette insertion operation
head.
This is detected by the Cassette Insertion Switch that is linked to
the actuator activated when a cassette is inserted.
1-2-5. Safety Tab Sensor/Actuator
Note: The Cassette Insertion Switch is not included
This actuator detects the tab that operates the REC SAFETY
with the deck mechanism.
Switch.
(C) Detection of completed cassette ejection operation
Note: This mechanism does not include the switch.
As above, this is detected by the shutter on the shutter
г
detecting the change іп the Tape Top Sensor. The light
1-2-6. Mode Sensor Switch
beam that is broken by cassette insertion/ejection is restored
This detects the 4-bit code before each position and is connected
when the cassette has been ejected.
to the tape loading mechanism.
1-2-2. Tape Loading Mechanism
1-2-7. Take-up/Supply Reel Sensor
Tape loading mechanism is the mechanism that is loaded
Photoelectric Cell
with the tape loading motor linked to the mode switch. The
A luminous diode and phototransister at the fixed position for the cell
following actions occur when the 4-bit position code output
comprise the reel sensor. (Pulse rate-8pulses/rotation)
from the mode detection switch is used.
(A) The tape is pulled out of the cassette and wound on the
.
cylinder. (tape loading)
N
(B) The tape is returned to the cassette. (tape unloading)
1-2-8. Tape Start/End Sensor Photoelectric Cell
(C) Function are switched so that each mechanism can operate.
A luminous diode and phototransister at the fixed position for the cell
1-2-3. Tape Transporta tion Mechanism
comprise the start/end sensor. (Pulse rate-8pulses/rotation)
|
Note: This mechanism does not include the luminous diode
The tape is fed through the VCR by the action of the capstan,
or the phototransister.
pinch roller and reel drive.
MA-2
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