System Control-Video Block Interface (Ma-323 Board Ic161); System Control-Servo Peripheral Circuit Interface (Ma-323 Board Ic161) - Sony SLV-ED1PL Service Manual

5-1. SYSTEM CONTROL – VIDEO BLOCK INTERFACE (MA-323 BOARD IC161)
STOP/
Signal Pin No. I/O
RF SWP MA-323
O
(SW30) IC161@¢
MA-323
QVD O
IC161@¶
MA-323
C SYNC I
IC161%¢
∗1. 30 Hz pulse with 50% duty cycle. Synchronized with rotation of drum.
∗2. Normal PB "L". V period "H" pulse when ×1.
∗3. V period "H" pulse.
∗4. Composite Sync signal (positive polarity).
5-2. SYSTEM CONTROL – SERVO PERIPHERAL CIRCUIT INTERFACE (MA-323 BOARD IC161)
Signal Pin No. I/O STOP
MA-323
CAP QR O
IC161(¢
MA-323
DRM PG I
IC161#ª
MA-323
DRM FG I
IC161#•
MA-323
CAP FG I
IC161$º
MA-323
CAP VS O
IC161@∞
MA-323
DRM VS O
IC161@§
∗1. 30 Hz 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. 360 Hz 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
FF/ THREAD- UNTHREAD- PB
PAUSE
REW ING ING
*1 *1 *1 *1
L L L *2
*4 *4 *4 *4
TAPE TAPE
FF REW THREAD- UNTHREAD-
ING ING
Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z
*3 *1 *1 *4 *4
*3 *6 *6 *4 *4
H/L
*5 *5 *4 *4
*7 *7 *7 *7 *7
*9 *9 *9 *9 *9
REC •
× 2
SLOW CUE REVIEW
*1 *1 *1 *1 *1
*3 *3 *3 *3 *3
*4 *4 *4 *4 *4
PB •
× 2
PB SLOW
PAUSE
Hi-Z Hi-Z Hi-Z
*2
*1 *1 *1 *1
*6 *6 *6 *6
H/L
*5 *5 *5
*8 *7 *7 *8
*9 *9 *9 *9
REC •
REC
PAUSE
*1 *1
L L
*4 *4
REC •
CUE REVIEW REC
PAUSE
Hi-Z Hi-Z Hi-Z Hi-Z
*1 *1 *1 *1
*6 *6 *6 *6
H/L
*5 *5 *5
*8 *8 *8 *7
*9 *9 *9 *9