System Control-Video Block Interface (Ma-325 Board Ic161); System Control-Servo Peripheral Circuit Interface (Ma-325 Board Ic161) - Sony SLV-ED8KR Service Manual

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5-1. SYSTEM CONTROL – VIDEO BLOCK INTERFACE (MA-325 BOARD IC161)
STOP/
Signal Pin No. I/O
REW
RF SWP MA-325
O
(SW30) IC1611
MA-325
QVD O
IC1614
MA-325
V SYNC I
IC161^§
∗1. 30 Hz pulse with 50% duty cycle. Synchronized with rotation of drum.
∗2. Normally "L". "H" when CTL sibnal is not generated.
∗3. V period "H" pulse.
∗4. Composite sync signal (positive polarity).
5-2. SYSTEM CONTROL – SERVO PERIPHERAL CIRCUIT INTERFACE (MA-325 BOARD IC161)
T E
L 1 3 9 4 2 2 9 6 5 1 3
Signal Pin No. I/O STOP
MA-325
REC CTL O Hi-Z
IC1617
MA-325 O
CAP STOP
IC161#∞ (O.D)
MA-325
STEP PLS O
IC161(ª
MA-325
PB CTL I
IC161^¶
MA-325
DRM PG I
IC161^•
MA-325
DRM FG I
IC161^ª
MA-325
CAP FG I
IC161&º
MA-325
CAP DA O
IC161&£
MA-325
DRM DA O
IC161&¢
MA-325
www
CTL RESET I/O Hi-Z
IC1618
∗1. 30 Hz pulse.
∗2. Pulse at tape running.
∗3. Reverse logic pulse of STEP PLS.
.
∗4. "L" when drum rotation stop.
∗5. Unstable period pulse.
∗6. Pulse of period in proportion to tape speed.
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TAPE TAPE
PB •
FF/ THREAD- UNTHREAD- PB
PAUSE
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 Hi-Z Hi-Z Hi-Z
L
(O.D) (O.D) (O.D) (O.D)
L L L L L
H *6 *6
*4 *1 *1 *5 *5
*4 *7 *7 *5 *5
H/L *6 *6 *5 *5
*8 *8 *8 *8 *8
*10 *10 *10 *10 *10
Hi-Z Hi-Z Hi-Z Hi-Z
x a o
∗7. 360 Hz pulse.
y
∗8. Pulse at tape running.
∗9. Approx. 2 msec period "H" or "L" pulse.
i
∗10. Approx. 1.5 msec period "H" or "L" pulse.
∗11. "L" when FWD slow, "H" when RVS slow.
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8
× 2
SLOW CUE REVIEW
*1 *1 *1 *1 *1
*3 *3 *3 *3 *3
*4 *4 *4 *4 *4
Q Q
3 7 6 3
PB •
× 2
PB SLOW
PAUSE
Hi-Z Hi-Z Hi-Z
*2
Hi-Z Hi-Z
L *3
(O.D) (O.D)
L L *2 L
*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
Hi-Z Hi-Z *11 Hi-Z
u 1 6 3
.
2 4
9 9 8
REC •
REC
PAUSE
*1 *1
L L
*4 *4
1 5 1 5 0 8 9 2 4
REC •
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 *1 H
*1 *1 *1 *1
*7 *7 *7 *7
*6 *6 *6 H/L
*9 *9 *9 *8
*10 *10 *10 *10
m
Hi-Z Hi-Z Hi-Z Hi-Z
c o
2
9 9
9 8 2 9 9