System Control - Mechanism Block Interface; (Ma-327 Board Ic160); System Control - Servo Peripheral Circuit Interface - Sony SLV-777HF Service Manual

5-1. SYSTEM CONTROL — MECHANISM BLOCK INTERFACE (MA-327 board IC160)
Signal Pin No. I/O
MA-327 Board
CW O
IC160 %•
MA-327 Board
MODE 1 I
IC160 @ª
MA-327 Board
MODE 2 I
IC160 @•
MA-327 Board
MODE 3 I
IC160 @¶
MA-327 Board
MODE 4 I
IC160 @§
MA-327 Board
REC PRF I
IC160 #º
MA-327 Board
T REEL I
IC160 *º
MA-327 Board
S REEL I
IC160 &ª
MA-327 Board
END LED O
IC160 @º
MA-327 Board
T SENS I
IC160 7
MA-327 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-327 board IC160)

Signal Pin No.
MA-327 Board
CTL IN+
IC160 (™
MA-327 Board
DRUM PG
IC160 *§
MA-327 Board
DRUM FG
IC160 *¶
MA-327 Board
CAP FG
IC160 *∞
MA-327 Board
CAP RVS
IC160 !§
MA-327 Board
CAP ERR
IC160 &¶
MA-327 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
INTERFACE, IC PIN FUNCTION DESCRIPTION
CASSETTE CASSETTE
EJECTED
LOARDING UNLOARDING
*5 H
— —
— —
— —
— —
L *1
H/L H/L
H/L H/L
L *3
*3 *3
*3 *3
I/O STOP FF REW
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
TAPE TAPE
THREADING UNTEREADING
L H
— — —
— — —
— — —
— — —
*1 *1 *1
H/L H/L H/L
H/L *2 *2
*3 *3 *3
*3 *4 *4
*3 *4 *4
TAPE TAPE
THREADING UNTHREADING
*7 *7
*3 *3
*4 *4
*5 *5
L H
*6 *6
*6 *6
5-1
SLV-777HF/778HF/788HF
STOP FF REW
L *5 *5 *5
H H H
L L L
H H H
H L L
*1 *1 *1
H/L *2 *2
H/L *2 *2
*3 *3 *3
*4 *4 *4
*4 *4 *4
PB REC
*7 *1
*3 *3
*4 *4
*2 *2
L L
*6 *6
*6 *6
PB REC
*5 *5
H H
H H
L L
L L
*1 *1
*2 *2
*2 *2
*3 *3
*4 *4
*4 *4