System Control - Video Block Interface - Sony SLV-SE85 Service Manual

5-1. SYSTEM CONTROL — VIDEO BLOCK INTERFACE (MA-359 BOARD IC160)
STOP
Signal Pin No. I/O
FF/REW
1
RF SWP O *1
4
QVD O L
*™
V SYNC I *4
(™
HA SWP O *1
*1 Synchronized with drum rotation. 30Hz 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-359 BOARD IC160)
Signal Pin No. I/O STOP
#£
CAP STOP O (O.D) L
(ª
STEP PLS O L
$∞
DRM PG I *4
$§
DRM FG I *4
$¶
CAP FG I H/L
&•
CAP DA O *8
&ª
DRM DA O *10
*1. 30Hz pulse (NTSC), 25Hz pulse (PAL).
*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. 360Hz pulse (NTSC), 300Hz pulse (PAL).
*8. Pulse at tape running.
*9. Approx. 2 msec period "H" or "L" pulse.
*10. Approx. 1.5 msec period "H" or "L" pulse.
TAPE TAPE
PB PB PAUSE
THREADING UNTHREADING
*1 *1 *1 *1
L L *2 *3
*5 *5 *5 *5
*1 *1 *1 *1
TAPE TAPE
FF REW
THREADING UNTHREADING
Hi-Z (O.D) Hi-Z (O.D) Hi-Z (O.D) Hi-Z (O.D)
L L L L
*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
*1 *1 *1 *1
PB PB PAUSE SLOW CUE
Hi-Z (O.D) L *3 Hi-Z (O.D)
L L *2 L
*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
*1 *1
x 2 REVIEW REC REC PAUSE
Hi-Z (O.D) Hi-Z (O.D) Hi-Z (O.D) Hi-Z (O.D)
L L L L
*1 *1 *1 *1
*7 *7 *7 *7
*6 *6 *6 H/L
*8 *9 *9 *8
*10 *10 *10 *10