TAPE TAPE
PB • REC •
Signal Pin No. I/O STOP FF REW THREAD- UNTHREAD- PB
PAUSE
SLOW × 2 CUE REVIEW REC
PAUSE
ING ING
CAP QR
MA-350
O Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z *2 Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z
IC161(¢
DRUM PG
MA-350
I *3 *1 *1 *4 *4 *1 *1 *1 *1 *1 *1 *1 *1
IC161#ª
DRUM FG
MA-350
I *3 *6 *6 *4 *4 *6 *6 *6 *6 *6 *6 *6 *6
IC161#•
CAP FG
MA-350
I H/L *5 *5 *4 *4 *5 H/L *5 *5 *5 *5 *5 H/L
IC161$º
CAP VS
MA-350
O *7 *7 *7 *7 *7 *8 *7 *7 *8 *8 *8 *8 *7
IC161@∞
DRUM VS
MA-350
O *9 *9 *9 *9 *9 *9 *9 *9 *9 *9 *9 *9 *9
IC161@§
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-350
O *1 *1 *1 *1 *1 *1 *1 *1 *1 *1 *1
IC161@¢
QVD
MA-350
OL L L *2 *3 *3 *3 *3 *3L L
IC161@¶
C SYNC
MA-350
I *4 *4 *4 *4 *4 *4 *4 *4 *4 *4 *4
IC161%¢
5-1. SYSTEM CONTROL – VIDEO BLOCK INTERFACE (MA-350 BOARD IC161)
∗1. 25 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-350 BOARD IC161)
∗1. 25 Hz (PAL), 30 Hz (NTSC) 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. 300 Hz (PAL), 360 Hz (NTSC) 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.
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