8. VCR Deck Operating Description
8-1 Features of Mechanism
The following items describe features of the mechanism in VCR.
(1) This VCR uses 3-motor system consisted of a cylinder motor, capstan motor, and loading motor.
A capstan motor is used to drive the reel and the driving force is transmitted throuch the belt capstan.
The cassette loading, tape loading, and mode shift operation are performed by the loading motor.
(2) The time duration from cassette-in to picture appearance is shortened by employing the loading drive mecha-
nism (automatic transferring operation from the cassette loading to the tape loading by rotating the loading
motor continuously), and by increasing the speed of the tape loading, etc
(3) Employment of the full loading system shortens time required to shift the mode such as STOP to PLAY-BACK
picture display.
(4) To simplify wiring and others, the electrical components relating to operation of the mechanical deck, such as
sensors, mode switch, servo microcomputer, etc. are mounted on the PCB arranged all over the bottom side of
the mechanical deck.
Samsung Electronics
8-1
Fig. 8-1 Basic Configuration of Mechanism
8-2 Basic Configuration of Mechanism
As shown in Fig. 8-1, the mechanism of VCR is configured with five main blocks, and each operation is precisely
controlled by the microcomputer built in the system control section.
First, load a video cassette tape in VCR :
(1) The cassette is automatically set on the reel disc.
(2) The tape is pulled out from the cassette, and wrapped around the cylinder.
(3) The cylinder turns in a constant speed rate synchronizing with the vertical Sync. signal of video signal.
(4) The tape runs in synchronization with cylinder rotation and traces the video tracks precisely.
(5) The running tape is taken up by the reel, the tape feeding side is given with a proper tension so that tape is not
slacked.
The above series of operations are performed under control of the system control section. The system control sec-
tion also sends commands to each mechanism according to the operation buttons, thus the VCR is designed so
that various operations such as recording, playback, special playback, FPS/RPS, and FF/REW, etc. are correctly
performed.
(Cylinder section)
(Front loading setion)
(Loading motor drive section)
(Front loading setion)
(Capstan drive section)
Capstan
Capstan servo
FG
Cylinder
Cylinder servo
System control
Control head
Cylinder servo
Start sensor
Cam slider
Tape loading
Tension post
Tape sensor
Reel brake
Idle gear
Reel sensor
REC-inhibiting SW
Pinch lever
Loading motor
FL
cam gear
Cassette holder
FG
PG
Summary of Contents for SV-DVD40
Page 82: ...Circuit Operating Descriptions 7 7 Fig 7 12 Block Diagram ...
Page 116: ...Circuit Operating Descriptions 7 41 3 Block Diagram Fig 7 38 LA70100M Block Diagram ...
Page 141: ...VCR Deck Operating Description 8 12 Samsung Electronics Fig 8 14 Mecha Timing Chart ...
Page 156: ...Samsung Electronics 11 1 11 Wiring Diagram ...
Page 158: ...Schematic Diagrams 12 2 Samsung Electronics 6 1 S M P S ...
Page 159: ...Schematic Diagrams Samsung Electronics 12 3 6 2 Power Drive ...
Page 160: ...Schematic Diagrams 12 4 Samsung Electronics DT701 6 3 Display Function ...
Page 161: ...Schematic Diagrams Samsung Electronics 12 5 6 4 System Control Servo ...
Page 162: ...Schematic Diagrams 12 6 Samsung Electronics 6 5 A V ...
Page 163: ...Schematic Diagrams Samsung Electronics 12 7 6 6 Hi Fi ...
Page 164: ...Schematic Diagrams 12 8 Samsung Electronics 6 7 A2 NICAM ...
Page 165: ...Schematic Diagrams Samsung Electronics 12 9 6 8 SECAM Option ...
Page 166: ...Schematic Diagrams 12 10 Samsung Electronics 6 9 OSD VPS PDC ...
Page 167: ...Schematic Diagrams Samsung Electronics 12 11 6 10 TM ...
Page 168: ...Schematic Diagrams 12 12 Samsung Electronics 6 11 Input Output ...
Page 169: ...Schematic Diagrams Samsung Electronics 12 13 6 12 DVD AV Decoder ...
Page 170: ...Schematic Diagrams 12 14 Samsung Electronics 6 13 DVD Servo ...
Page 171: ...Schematic Diagrams Samsung Electronics 12 15 6 14 DVD Audio Video ...
