System Control - Mechanism Block Interface; (Ma-317 Board Ic160); System Control - Servo Peripheral Circuit Interface - Sony SLV-478 Service Manual

INTERFACE, IC PIN FUNCTION DESCRIPTION
5-1. SYSTEM CONTROL — MECHANISM BLOCK INTERFACE (MA-317 board IC160)
Signal Pin No. I/O
MA-317 Board
CW O
IC160 %•
MA-317 Board
MODE 1 I
IC160 @ª
MA-317 Board
MODE 2 I
IC160 @•
MA-317 Board
MODE 3 I
IC160 @¶
MA-317 Board
MODE 4 I
IC160 @§
MA-317 Board
REC PRF I
IC160 #º
MA-317 Board
T REEL I
IC160 *º
MA-317 Board
S REEL I
IC160 &ª
MA-317 Board
END LED O
IC160 @º
MA-317 Board
T SENS I
IC160 7
MA-317 Board
S SENS I
IC160 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
5-2. SYSTEM CONTROL — SERVO PERIPHERAL CIRCUIT INTERFACE

(MA-317 board IC160)

Signal Pin No.
MA-317 Board
CTL IN+
IC160 (™
MA-317 Board
DRUM PG
IC160 *§
MA-317 Board
DRUM FG
IC160 *¶
MA-317 Board
CAP FG
IC160 *∞
MA-317 Board
CAP RVS
IC160 !§
MA-317 Board
CAP ERR
IC160 &¶
MA-317 Board
DRUM ERR
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).
SECTION 5
CASSETTE CASSETTE
EJECTED
LOARDING UNLOARDING
*5 H L
— — —
— — —
— — —
— — —
L *1 *1
H/L H/L H/L
H/L H/L H/L
L *3 *3
*3 *3 *3
*3 *3 *3
I/O STOP FF REW
THREADING
O *7 *7 *7
I *3 *3 *3
I *4 *4 *4
I H/L *2 *2
O H/L L H
O L *6 *6
O *6 *6 *6
SLV-478/677HF/678HF/688HF/L47/L48/L57/
L58/L67HF/L68HF/L77HF/L78HF/X50/X60HF
TAPE TAPE
THREADING UNTEREADING
H L
— —
— —
— —
— —
*1 *1
H/L H/L
*2 *2
*3 *3
*4 *4
*4 *4
TAPE TAPE
PB
UNTHREADING
*7 *7
*3 *3
*4 *4
*5 *5
L H
*6 *6
*6 *6
5-1
STOP FF REW PB
*5 *5 *5 *5
H H H H
L L L H
H H H L
H L L L
*1 *1 *1 *1
H/L *2 *2 *2
H/L *2 *2 *2
*3 *3 *3 *3
*4 *4 *4 *4
*4 *4 *4 *4
REC
*7 *1
*3 *3
*4 *4
*2 *2
L L
*6 *6
*6 *6
REC
*5
H
H
L
L
*1
*2
*2
*3
*4
*4