Interface, Ic Pin Function Description; System Control - Mechanism Block Interface (Ma-342 Board Ic160); System Control - Servo Peripheral Circuit Interface (Ma-342 Board Ic160) - Sony SLV-789HF Service Manual

INTERFACE, IC PIN FUNCTION DESCRIPTION

5-1. SYSTEM CONTROL — MECHANISM BLOCK INTERFACE
(MA-342 BOARD IC160)
Signal Pin No. I/O
MA-342 Board
CAM O
IC160#£
MA-342 Board
MODE 1
IC160@ª
MA-342 Board
MODE 2
IC160@•
MA-342 Board
MODE 3
IC160@¶
MA-342 Board
MODE 4
IC160@§
MA-342 Board
REC PRF
IC160#º
MA-342 Board
T REEL
IC160*º
MA-342 Board
S REEL
IC160&ª
MA-342 Board
END LED O
IC160@º
MA-342 Board
T SENS
IC1607
MA-342 Board
S SENS
IC1606
*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" pluse when tape top or end is detected.
*4 Normally "L". 2 msec period "H" puise when tape top or end is detected.
*5 Hi-Z
5-2. SYSTEM CONTROL — SERVO PERIPHERAL CIRCUIT INTERFACE
(MA-342 BOARD IC160)
Signal Pin No. I/O
MA-342 Board
CTL IN+ O
IC160(∞
MA-342 Board
DRUM PG
IC160(º
MA-342 Board
DRUM FG
IC160*ª
MA-342 Board
CAP FG
IC160*¶
MA-342 Board
CAP RVS O
IC160@¢
MA-342 Board
CAP ERR
O
IC160&§
MA-342 Board
DRUM ERR O
IC160&¶
*1. 30Hz pulse.
*2. Pulse of period in propotion to tape speed.
*3. 30Hz "H" pluse.
*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
I — — —
I — — —
I — — —
I — — —
I L *1 *1
I H/L H/L H/L
I H/L H/L H/L
L *3 *3
I *3 *3 *3
I *3 *3 *3
TAPE
STOP FF REW
THREADING
*7 *7 *7
I *3 *3 *3
I *4 *4 *4
I H/L *2 *2
H/L L H
L *6 *6
*6 *6 *6
TAPE TAPE
STOP
THREADING UNTEREADING
H L
— —
— —
— —
— —
*1 *1
H/L H/L
*2 *2
*3 *3
*4 *4
*4 *4
TAPE
PB REC
UNTEREADING
*7 *7 *7
*3
*3 *3
*4 *4 *4
*5
*5 *2
L H L
*6 *6 *6
*6 *6 *6
5-1
SLV-789HF/792HF/799HF
FF REW PB REC
*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
*1
*3
*4
*2
L
*6
*6
*5
H
H
L
L
*1
*2
*2
*3
*4
*4