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5-3. SYSTEM CONTROL – MECHANISM BLOCK INTERFACE (MA-325 BOARD IC161)
3 7 6 3 1 5 1 5 0
Signal
Pin No.
I/O
EJECTED
MA-325
CAM
O
Hi-Z
IC1619
MA-325
MODE 1
I
H
IC161@™
MA-325
MODE 2
I
H
IC161@¡
MA-325
MODE 3
I
L
IC161@º
MA-325
MODE 4
I
L
IC161!ª
MA-325
C IN REC PRF
I
H
IC161!∞
MA-325
T REEL FG
I
H/L
IC161^¢
MA-325
S REEL FG
I
H/L
IC161^£
MA-325
O
T/S LED
*4
IC161#™
(O.D)
MA-325
O
CAP STOP
L
IC161#∞
(O.D)
MA-325
CAP RVS
O
L
T E
L 1 3 9 4 2 2 9 6 5 1 3
IC161&™
MA-325
T SENS
I
*4
IC161^¡
MA-325
S SENS
I
*4
IC161^™
∗1. Uncertainly.
∗2. "L" when erasing protection tab is bent, "H" when not bent.
∗3. Pulse of period in proportion to reel rotating speed.
∗4. Approx. 2 msec period "H" pulse.
∗5. Pulse at tape running.
∗6. Normally "L". 2 msec period "H" pulse when tape top or tape end is detected.
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TAPE
TAPE
CASSETTE CASSETTE
THREAD- UNTHREAD- STOP
LOADING UNLOADING
ING
ING
H
L
H
L
L
L
*1
*1
L
L
*1
*1
L
L
*1
*1
H
H
*1
*1
*2
*2
*2
*2
H/L
H/L
H/L
H/L
H/L
H/L
*3
*3
*4
*4
*4
*4
L
L
H
H
H
L
*4
*4
*6
*6
*4
*4
*6
*6
∗7. When transition to UNLOADING direction: L.
When transition to LOADING direction: H.
When CAM motor is stopped: Hi-Z.
∗8. When RVS slow: mode 1; L.
When RVS slow: mode 2; L.
When RVS slow: mode 3; H.
When RVS slow: mode 4; L.
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8
9
PB •
FF
REW
PB
SLOW
PAUSE
*7
*7
*7
*7
*7
*7
H
H
H
H
H
H
H
H
H
L
L
L
H
L
L
L
L
L
L
H
H
L
L
L
*2
*2
*2
*2
*2
*2
H/L
*3
*3
*3
H/L
*3
H/L
*3
*3
*3
H/L
*3
*4
*4
*4
*4
*4
*4
L
H
H
H
L
*5
Q
Q
H/L
H
L
H
H
H/*5
3
7
6
3
1
5
*6
*6
*6
*6
*6
*6
*6
*6
*6
*6
*6
*6
c o
.
2
4
2
9
8
REC •
× 2
CUE
REVIEW
REC
PAUSE
*7
*7
*7
*7
*7
H
H
L
H
H
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
*2
*2
*2
*2
*2
*3
*3
*3
*3
H/L
*3
*3
*3
*3
H/L
*4
*4
*4
*4
*4
H
H
H
H
L
H
H
L
H
H
1
5
0
8
9
2
4
9
8
*6
*6
*6
*6
*6
*6
*6
*6
*6
*6
m
9
9
2
9
9
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