System Control-Video Block Interface (Ma10 Board Ic402); System Control-Servo Peripheral Circuit Interface (Ma10 Board Ic402) - Sony KV-14FV1B Service Manual

4-2.

SYSTEM CONTROL-VIDEO BLOCK INTERFACE (MA10 BOARD IC402)

Signal Pin No. I/O
IC402 1
RF SW P (SW30) O
IC402 4
Q VD O
IC402 ^§
V SYNC I
*1. 30Hz 50% duty pulse synchronizing with drum rotation.
*2. Normally "L" . "H" when the video signal is not detected.
*3. V period "H" pulse.
*4. "H" in the LP mode. Selected according to the recording mode.
*5. Selected according to the tape recording mode.
4-3.

SYSTEM CONTROL-SERVO PERIPHERAL CIRCUIT INTERFACE (MA10 BOARD IC402)

Signal Pin No. I/O
IC402 7
REC CTL O
O
IC402 #¢
CAP STOP
(O.D)
IC402 (ª
STEP PLS O
IC402 ^¶
PB CTL I
IC402 ^•
DRUM PG I
IC402 ^ª
DRUM FG I
IC402 &º
CAP FG I
IC402 &£
CAP DA O
IC402 &¢
DRUM DA O
IC402 0
CTL RESET I/O
*1. 30Hz 50% pulse.
*2. Pulse in tape running.
*3. Reverse logic pulse of STEP PLS.
*4. "L" when drum rotation stops.
*5. Unstable period pulse.
*6. Pulse of Period proportionate to tape speed.
*7. 360Hz pulse.
*8. Pulse in tape running.
*9. Approx. 2 msec. period "H" or "L" pulse.
*10. Approx. 1.5 msec. period "H" or "L" pulse.
TAPE
STOP FF REW THREADING UNTHREADING
*1 *1 *1 *1
L L L L
*4 *4 *4 *5
TAPE
STOP FF REW THREADING UNTHREADING
HI-Z HI-Z HI-Z HI-Z
HI-Z HI-Z HI-Z
L
(O.D) (O.D) (O.D)
L L L L
H *6 *6
*4 *1 *1 *5
*4 *7 *7 *5
H/L *6 *6 *5
*8 *8 *8 *8
*10 *10 *10 *10
HI-Z HI-Z HI-Z HI-Z
TAPE PB ·
PB PAUSE SLOW
*1 *1 *1 *1
L *2 *3 *3
*5 *5 *5 *5
TAPE PB ·
PB PAUSE SLOW
HI-Z HI-Z HI-Z HI-Z
HI-Z HI-Z
L *3
(O.D) (O.D)
L L L *2
*1 H/L *2
*5 *1 *1 *1
*5 *7 *7 *7
*5 *6 H/L *2
*8 *9 *8 *8
*10 *10 *10 *10
HI-Z HI-Z HI-Z *11
PICTURE SEARCH
X2 CUE REVIEW REC
*1 *1 *1
*3 *3 *3
*5 *5 *5
PICTURE SEARCH REC ·
X2 CUE REVIEW REC PAUSE
HI-Z HI-Z HI-Z *1
HI-Z HI-Z HI-Z HI-Z
(O.D) (O.D) (O.D) (O.D)
L L L L
*6 *6 *6 *1
*1 *1 *1 *1
*7 *7 *7 *7
*6 *6 *6 *6
*9 *9 *9 *9
*10 *10 *10 *10
HI-Z HI-Z HI-Z HI-Z
REC ·
PAUSE
*1 *1
L L
*5 *5
HI-Z
HI-Z
(O.D)
L
H
*1
*7
H/L
*8
*10
HI-Z