Sony SLV-GA30, Service Manual

Page: 39 / 120

5-2
5-4. SYSTEM CONTROL — AUDIO BLOCK INTERFACE (MA-336 BOARD IC201)
*1. 30 Hz 50 % duty pulse approx. 5 msec delayed from RF SW P.
5-3. SYSTEM CONTROL — MECHANISM INTERFACE (MA-336 BOARD IC201)
*1. Uncertainly.
*2. “L” when erasing protection tab is bent. “H” when not bent.
*3. Pause 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.
Signal
CAM2
MODE 1 (*8)
MODE 2 (*8)
MODE 3 (*8)
MODE 4 (*8)
REC PRF
T REEL FG
S REEL FG
END LED
CAP RVS
T SENS
S SENS
Pin No.
(∞
^™
^£
^¢
^∞
1
*•
*ª
&¢
%∞
!™
!¡
I/O
HI-Z
I
I
I
I
I
I
I
O (O.D)
O
I
I
EJECTED
L
H
H
L
L
H
H/L
H/L
*4
H
*4
*4
CASSETTE
LOADING
H
L
L
L
H
*2
H/L
H/L
*4
*4
*4
CASSETTE
UNLOADING
L
L
L
L
H
*2
H/L
H/L
*4
*4
*4
TAPE
THREADING
H
*1
*1
*1
*1
*2
H/L
*3
*4
L
*6
*6
TAPE
UNTHREADING
L
*1
*1
*1
*1
*2
H/L
*3
*4
H
*6
*6
STOP
*7
H
H
H
L
*2
H/L
H/L
*4
H/L
*6
*6
FF
*7
H
H
L
H
*2
*3
*3
*4
L
*6
*6
REW
*7
H
H
L
H
*2
*3
*3
*4
H
*6
*6
PB
*7
H
L
L
H
*2
*3
*3
*4
L
*6
*6
PB PAUSE
*7
H
L
L
L
*2
H/L
H/L
*4
L
*6
*6
SLOW
*7
H
L
L
L
*2
*3
*3
*4
L/*5
*6
*6
x 2
*7
H
L
L
L
*2
*3
*3
*4
L
*6
*6
CUE
*7
H
L
L
L
*2
*3
*3
*4
L
*6
*6
REVIEW
*7
L
L
H
L
*2
*3
*3
*4
H
*6
*6
REC
*7
H
L
L
L
*2
*3
*3
*4
L
*6
*6
REC
PAUSE
*7
H
L
L
L
*2
H/L
H/L
*4
L
*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”
Signal
AF ENV
A MUTE
AF REC P
AF SWP
Pin No.
!¢
@¡
!¶
@£
I/O
I
O (O.D)
O
O
STOP/FF/
REW
L
L
*1
TAPE
LOADING
L
L
*1
TAPE
UNLOADING
L
L
*1
PB
*1
L
*1
PB PAUSE
H
L
*1
SLOW
H
L
*1
x 2
H
L
*1
CUE
H
L
*1
REVIEW
H
L
*1
REC
L
H
*1
REC PAUSE
L
L
*1
AF RF envelope signal input terminal for automatic tracking.