Circuit Operating Descriptions
7-8
(2) Mechanism/Circuit Control
When the u-COM inputs operator’s commands via the key input or remote input, the mechanism and circuits are
set to the command mode. This function controls mechanism/servo section and audio/video processing section.
1) Cassette Loading Control
Controls loading and ejection of a cassette and determines the mechanism operation mode; tape loading/
unloading, action/release of various breaks, tension, take up mechanism etc.
2) Tape Protection Sensor Monitoring
Detects abnormal operation in tape using the supply and take up end sensor, reel sensor and SW 25Hz pulse
for drum rotation.
3) Capstan Motor Control
Determines the tape speed and direction, fast forwards and rewinds the tape etc.
4) Tape Counter Control
Counts the control pulses on the control track, picked up by the control head and shows it on the digital
multidisplay.
5) Servo Control
Determines the operation mode of the servo circuit. Control the speed of drum and capstan motor, and then
Control the phase of drum and capstan motor.
6) Record Safety Tap Detection
Detects the safety tab on the rear of a cassette to prevent a prerecorded program from being erased.
7) Loading/Unloading control
Controls a series of loading/unloading operation after the u-COM judges the operation mode and sets the
mechanism to suitable mode. Fig. 7-13 show correlation between u-COM and peripheral components during
the loading/unloading operation.
The mechanism state switch (PROG. SW) detects the mechanism position. When the driving gear is turned by
the loading motor, the switch driving slider traces the groove, and this switch stops at the correct position
corresponding to each mode. In other words, the u-COM judges the present mechanism state from the PROG
SW after receiving the mode data, then it outputs the loading motor and capstan motor control signals.
This continues until the PROG SW reaches the correct state by the u-COM.
<u-COM>
SYSTEM
CONTROL
FUNCTION-TIMER
CAPSTAN / DRUM
MOTOR
CAPSTAN
MOTOR ASS'Y
(3 in 1)
DFG,DFG
CFG
SERVO BLOCK
LOADING
MOTOR
LOADING
GEAR
PROG
SW
MECHANISM STATE
INFORMATION
OPERATION
MODE
DISPLAY
AND
KEY
MATRIX
Fig. 7-13 The Relationship Between u-COM, Capstan, Cylinder and Loading Motor
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 ...
