5-1
SLV-777HF/778HF/788HF
SECTION 5
INTERFACE, IC PIN FUNCTION DESCRIPTION
5-1. SYSTEM CONTROL — MECHANISM BLOCK INTERFACE (MA-327 board IC160)
5-2. SYSTEM CONTROL — SERVO PERIPHERAL CIRCUIT INTERFACE
(MA-327 board IC160)
*1.
30 Hz pulse
*2.
Pulse of period in propotion to tape speed.
*3.
30 Hz “H” pulse.
*4.
720 Hz pulse.
*5.
Unstable period pulse.
*6.
DC voltage 1 ~ 5V.
*7.
Hi-Z (2.5V).
Signal
CW
MODE 1
MODE 2
MODE 3
MODE 4
REC PRF
T REEL
S REEL
END LED
T SENS
S SENS
Pin No.
MA-327 Board
IC160
%•
MA-327 Board
IC160
@ª
MA-327 Board
IC160
@•
MA-327 Board
IC160
@¶
MA-327 Board
IC160
@§
MA-327 Board
IC160
#º
MA-327 Board
IC160
*º
MA-327 Board
IC160
&ª
MA-327 Board
IC160
@º
MA-327 Board
IC160
7
MA-327 Board
IC160
6
I/O
O
I
I
I
I
I
I
I
O
I
I
EJECTED
*5
—
—
—
—
L
H/L
H/L
L
*3
*3
CASSETTE
LOARDING
H
—
—
—
—
*1
H/L
H/L
*3
*3
*3
TAPE
THREADING
H
—
—
—
—
*1
H/L
*2
*3
*4
*4
TAPE
UNTEREADING
L
—
—
—
—
*1
H/L
*2
*3
*4
*4
STOP
*5
H
L
H
H
*1
H/L
H/L
*3
*4
*4
FF
*5
H
L
H
L
*1
*2
*2
*3
*4
*4
REW
*5
H
L
H
L
*1
*2
*2
*3
*4
*4
PB
*5
H
H
L
L
*1
*2
*2
*3
*4
*4
REC
*5
H
H
L
L
*1
*2
*2
*3
*4
*4
CASSETTE
UNLOARDING
L
—
—
—
—
*1
H/L
H/L
*3
*3
*3
Signal
CTL IN+
DRUM PG
DRUM FG
CAP FG
CAP RVS
CAP ERR
DRUM ERR
Pin No.
MA-327 Board
IC160
(™
MA-327 Board
IC160
*§
MA-327 Board
IC160
*¶
MA-327 Board
IC160
*∞
MA-327 Board
IC160
!§
MA-327 Board
IC160
&¶
MA-327 Board
IC160
&•
I/O
O
I
I
I
O
O
O
STOP
*7
*3
*4
H/L
H/L
L
*6
FF
*7
*3
*4
*2
L
*6
*6
REW
*7
*3
*4
*2
H
*6
*6
REC
*1
*3
*4
*2
L
*6
*6
TAPE
THREADING
*7
*3
*4
*5
L
*6
*6
TAPE
UNTHREADING
*7
*3
*4
*5
H
*6
*6
PB
*7
*3
*4
*2
L
*6
*6
*1.
“L” When erasing protection tab is bent. “H” when not bent.
*2.
Pulse of period in proportion to reel rotating speed.
*3.
Approx. 2 msec period “H” pulse when tape top or end is detected.
*4.
Normally “L”. 2 msec period “H” pulse when tape top or end is detected.
*5.
Hi-Z
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