TAPE TAPE
PB • REC •
Signal Pin No. I/O STOP FF REW THREAD- UNTHREAD- PB
PAUSE
SLOW × 2 CUE REVIEW REC
PAUSE
ING ING
REC CTL
MA-325
O Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z *2 Hi-Z Hi-Z Hi-Z *1 Hi-Z
IC1617
CAP STOP
MA-325 O
L
Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z
L *3
Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z
IC161#∞ (O.D) (O.D) (O.D) (O.D) (O.D) (O.D) (O.D) (O.D) (O.D) (O.D) (O.D)
STEP PLS
MA-325
OLLL L L LL*2LLLLL
IC161(ª
PB CTL
MA-325
IH*6*6 *1 H/L *2 *6 *6 *6 *1H
IC161^¶
DRM PG
MA-325
I *4 *1 *1 *5 *5 *1 *1 *1 *1 *1 *1 *1 *1
IC161^•
DRM FG
MA-325
I *4 *7 *7 *5 *5 *7 *7 *7 *7 *7 *7 *7 *7
IC161^ª
CAP FG
MA-325
I H/L *6 *6 *5 *5 *6 H/L *2 *6 *6 *6 *6 H/L
IC161&º
CAP DA
MA-325
O *8 *8 *8 *8 *8 *9 *8 *8 *9 *9 *9 *9 *8
IC161&£
DRM DA
MA-325
O *10 *10 *10 *10 *10 *10 *10 *10 *10 *10 *10 *10 *10
IC161&¢
CTL RESET
MA-325
I/O Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z *11 Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z
IC1618
STOP/ TAPE TAPE
PB • REC •
Signal Pin No. I/O FF/ THREAD- UNTHREAD- PB
PAUSE
SLOW × 2 CUE REVIEW REC
PAUSE
REW ING ING
RF SWP MA-325
O *1 *1 *1 *1 *1 *1 *1 *1 *1 *1 *1
(SW30) IC1611
QVD
MA-325
OL L L *2*3*3*3*3*3L L
IC1614
V SYNC
MA-325
I *4 *4 *4 *4 *4 *4 *4 *4 *4 *4 *4
IC161^§
NT JUDGE
MA-325
OL L L LLLLLLLL
IC161!£
5-1. SYSTEM CONTROL – VIDEO BLOCK INTERFACE (MA-325 BOARD IC161)
∗1. 25 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)
∗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 stop.
∗5. Unstable period pulse.
∗6. Pulse of period in proportion 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.
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