System Control - Servo Peripheral Circuit Interface - Sony SLV-GA30 Service Manual

5-1. SYSTEM CONTROL — VIDEO BLOCK INTERFACE (MA-336 BOARD IC201)
STOP
Signal Pin No. I/O
FF/REW
@¢
RF SWP O *1
@¶
QVD O L
%¢
C SYNC I *4
!•
NT JUDGE O L
*1 Synchronized with drum rotation. 25 Hz (PAL), 30 Hz (NTSC) 50% duty cycle.
*2 Normally "L". "H" when CTL signal is not generated.
*3 V period "H" pulse.
*4 Selected by REC mode. "H" in LP mode."
*5 Composite sync signal (positive).
5-2. SYSTEM CONTROL — SERVO PERIPHERAL CIRCUIT INTERFACE (MA-336 BOARD IC201)
Signal Pin No. I/O STOP
#¡
CTL (+) O Hi-Z
#™
CTL (–) I H
#ª
DRM PG I *4
#•
DRM FG I *4
$º
CAP FG I H/L
@∞
CAP VS O *8
@§
DRM VS O *10
*1. 25 Hz (PAL), 30 Hz (NTSC) pulse.
*2. Pulse at tape running.
*3. Reverse logic pulse of STEP PLS.
*4. "L" when drum rotation stops.
*5. Unstable period pulse.
*6. Pulse in period in proportional to tape speed.
*7. 300 Hz (PAL), 360 Hz (NTSC) pulse.
*8. Pulse at tape running.
*9. Approx. 2 msec period "H" or "L" pulse.
*10. Approx. 1.5 msec period "H" or "L" pulse.
*11. "L" when FWD SLOW, "H" when RVS SLOW.
TAPE TAPE
PB PB PAUSE
THREADING UNTHREADING
*1 *1 *1 *1
L L *2 *3
*5 *5 *5 *5
L L L L
TAPE TAPE
FF REW
THREADING UNTHREADING
Hi-Z Hi-Z Hi-Z Hi-Z
*6 *6
*1 *1 *5 *5
*7 *7 *5 *5
*6 *6 *5 *5
*8 *8 *8 *8
*10 *10 *10 *10
SLOW x 2 CUE REVIEW
*1 *1 *1 *1
*3 *2 *3 *3
*5 *5 *5 *5
L L L L
PB PB PAUSE SLOW CUE
Hi-Z Hi-Z Hi-Z Hi-Z
*1 H/L *2 *6
*1 *1 *1 *1
*7 *7 *7 *7
*6 H/L *2 *6
*9 *8 *8 *9
*10 *10 *10 *10
REC REC PAUSE
*1 *1
L L
*5 *5
L L
x 2 REVIEW REC REC PAUSE
Hi-Z Hi-Z *1 Hi-Z
*6 *6 *1 H
*1 *1 *1 *1
*7 *7 *7 *7
*6 *6 *6 H/L
*8 *9 *9 *8
*10 *10 *10 *10