7
POSITION NAME
POSITION NO E
J
E
C
T
S
R
E
W
E
SL
O
A
D
R
E
W
F
FS
T
O
P
P
L
A
Y
C
T
R
E
V
E
R
S
E
F
S
L
O
W
R
S
L
O
W
SWITCH
ON/OFF
TIMING
POSITION
CODE
WHITE=OFF
BLACK=ON
1=OFF
0=ON
M1 SW
M2 SW
M3 SW
M4 SW
COM SW
COM-M1
COM-M2
COM-M3
COM-M4
0 1 0 1 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 1
0 1 0 1 1 1 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 0 1
1 1 1 1 1 1 1 1 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1
1 1 0 1 0 1 1 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1
MODE SW
Equivalent
Circuit
COM
COM
SW
M1
M1
SW
M2
M2
SW
M3
M3
SW
M4
M4
SW
1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23234
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 ln 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.
1-2. CONFIGURATION OF THE
TN6500 VCR MECHANISM
1-2-1. Cassette Drive Mechanism
The cassette is loaded and ejected via the drive from the
capstan motor.
(A) Detection of cassette insertion
When an cassette is inserted, the capstan motor starts and
simultaneouslycausestheshutteronthemainunit to break thelight
beamoftheTapeTopSensor.ThiscapstanFGpulseandtheTape
Top Sensor change cause the cassette to be pulled into the VCR.
(B) Detection of completed cassette insertion operation
Thisisdetected bytheCassetteInsertion Switchthatis linked to
the actuator activated when a cassette is inserted.
Note: The Cassette Insertion Switch is not included
with the deck mechanism.
(C) Detection of completed cassette ejection operation
As above, this is detected by the shutter on the shutter
detecting the change in the Tape Top Sensor. The light
beamthatisbrokenbycassetteinsertion/ejectionisrestored
when the cassette has been ejected.
1-2-2. Tape Loading Mechanism
Tape loading mechanism is the mechanism that is loaded
with the tape loading motor linked to the mode switch. The
following actions occur when the 4-bit position code output
from the mode detection switch is used.
(A) The tape is pulled out of the cassette and wound on the
cylinder. (tape loading)
(B) The tape is returned to the cassette. (tape unloading)
(C) Function are switched so that each mechanism can operate.
1-2-3. Tape Transportation Mechanism
The tape is fed through the VCR by the action of the capstan,
pinch roller and reel drive.
1-2-4. Motor
(A) Capstan Motor
The 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.
(B) Tape Loading Motor
In addition to cassette loading/unloading, this motor also
switched between the various operating modes(PLAY, FF/
REW etc. )
(C) Cylinder Motor
Connected to the rotating head drum and drives the rotating
head.
1-2-5. Safety Tab Sensor/Actuator
This actuator detects the tab that operates the REC SAFETY
switch.
Note: This mechanism does not include the switch.
1-2-6. Mode Sensor Switch
Thisdetectsthe 4-bit codebeforeeachposition and isconnected
to the tape loading mechanism.
1-2-7. Take-up/Supply Reel Sensor
Photoelectric Cell
A luminous diode and phototransister at the fixed position for the cell
comprise the reel sensor. (Pulse rate=8pulses/rotation)
Note: This mechanism does not include the luminous diode
or the phototransister.
1-2-8. Tape Start/End Sensor Photoelectric Cell
A luminous diode and phototransister at the fixed position for the cell
comprise the start/end sensor. (Pulse rate=8pulses/rotation)
Note: This mechanism does not include the luminous diode
or the phototransister.
MV-8080G_5(6~16) 97.12.11, 9:36Page 7 Adobe PageMaker 6.0J/PPC
