System Control-Video Block Interface (Ma-402 Board Ic101); System Control-Servo Peripheral Circuit Interface (Ma-402 Board Ic101) - Sony SLV-ED212 Service Manual

5-1. SYSTEM CONTROL – VIDEO BLOCK INTERFACE (MA-402 BOARD IC101)
STOP/
Signal I/O
Pin No.
FF/REW
MA-402
RF SWP O *1
IC101
105
MA-402
QVD O
IC101
109
MA-402
I *4
C SYNC
IC101
111
*1 25 Hz pulse with 50% duty cycle. Synchronized with rotation of drum.
*2 Normal PB "L". V period "H" pulse when x1.
*3 V period "H" pulse.
*4 Composite sync signal (positive polarity).
5-2. SYSTEM CONTROL – SERVO PERIPHERAL CIRCUIT INTERFACE (MA-402 BOARD IC101)
Signal Pin No. I/O STOP
MA-402
CAP QR O Hi-Z
IC101
91
MA-402
DRUM PG I *3
IC101
104
MA-402
DRUM FG I *3
IC101
103
MA-402
CAP FG I H/L
IC101 9
MA-402
CAP PWM O *7
IC101
108
MA-402
DRUM PWM O *9
IC101 107
*1. 25 Hz (PAL), 30 Hz (NTSC) pulse.
*2. Pulse at tape running.
*3. "L" when drum rotation stop.
*4. Unstable period pulse.
*5. Pulse of period in proportion to tape speed.
*6. 300 Hz (PAL), 360 Hz (NTSC) pulse.
*7. Pulse at tape running.
*8. Approx. 2 msec period "H" or "L" pulse.
*9. Approx. 1.5 msec period "H" or "L" pulse.
TAPE
TAPE
UNTHREAD-
PB
THREADING PAUSE
ING
*1 *1 *1
L L L *2
*4 *4 *4
TAPE
TAPE
UNTHREAD-
FF REW
THREADING
ING
Hi-Z Hi-Z Hi-Z Hi-Z
*1 *1 *4 *4
*6 *6 *4 *4
*5 *5 *4 *4
*7 *7 *7 *7
*9 *9 *9 *9
PB •
SLOW x 2 CUE REVIEW
*1 *1 *1 *1 *1
*3 *3 *3 *3 *3
*4 *4 *4 *4 *4
PB •
PB SLOW x 2 CUE
PAUSE
Hi-Z Hi-Z *2 Hi-Z Hi-Z
*1 *1 *1 *1 *1
*6 *6 *6 *6 *6
*5 H/L *5 *5 *5
*8 *7 *7 *8 *8
*9 *9 *9 *9 *9
REC •
RECORD
PAUSE
*1 *1
*3 *3
*4 *4
REC •
REVIEW RECORD
PAUSE
Hi-Z Hi-Z Hi-Z
*1 *1 *1
*6 *6 *6
*5 *5 H/L
*8 *8 *7
*9 *9 *9