System Control-Mechanism Block Interface (Ma10 Board Ic402); System Control-System Control Peripheral Circuit Interface (Ma10 Board Ic402); System Control-Audio Block Interface (Ma10 Board Ic402) - Sony TRINITRON KV-VF21M40 Service Manual

4-4.

SYSTEM CONTROL-MECHANISM BLOCK INTERFACE (MA10 BOARD IC402)

CASSETTE CASSETTE
Signal Pin No. I/O EJECTED LOADING UNLOADING THREADING UNTHREADING STOP
CAM UN LOAD IC402 9
O HI-Z
IC402 8
CAM LOAD O L
IC402 @™
MODE 1 I H
IC402 @¡
MODE 2 I H
IC402 @º
MODE 3 I L
IC402 !ª
MODE 4 I L
C IN REC PRF IC402 !¶
I L
IC402 ^¢
T REEL FG I H/L
IC402 ^£
S REEL FG I H/L
O
IC402 #
*4
T/S LED
(O.D)
O
IC402 #¢
L
CAP STOP
(O.D)
IC402 &™
CAP RVS O L
IC402 ^¡
T SENS I *4
IC402 ^™
S SENS I *4
*1. Uncertainty.
*2. "L" when the erasing protection tab is bent, "H" when not bent.
*3. Pulse of period proportionate to reel rotation speed.
*4. Apporx. 2 msec. period "H" pulse.
*5. Pulse in tape running.
*6. Normally "L". 2 msec. period "H" pulse when tape top or tape end is detected.
*7. "L" when unloading to switchover. "H" when loading. "HI-Z" when CAM motor is stop.
4-5.

SYSTEM CONTROL-SYSTEM CONTROL PERIPHERAL CIRCUIT INTERFACE (MA10 BOARD IC402)

Signal Pin No. I/O
IC402 $º
ASURA RESET I Normally "H"."L"when service interruption is detected or restored.
IC402 $¢
ASURA CS I Chip select signal from the timer microprocessor. V period "L" pulse.
IC402 $
S IN 0 I Serial communication data from the timer microprocessor. V period "L" pulse.
IC402 $§
S OUT 0 O Serial communication data to the timer microprocessor. V period "L" pulse.
IC402 $¶
S CLK I Serial communication clock with the timer microprocessor. V period "L" pulse.
4-6.

SYSTEM CONTROL-AUDIO BLOCK INTERFACE (MA10 BOARD IC402)

Sigmal Pin No. I/O
O
IC402 $ª
A MUTE
(O.D)
*1. 30Hz 50% duty pulse approximately 5 msec. delayed from RF SW P.
TAPE TAPE
H L H L *7
L L L L L
L L *1 *1 H
L L *1 *1 H
L L *1 *1 H
H H *1 *1 L
*2 *2 *2 *2 *2
H/L H/L H/L H/L H/L
H/L H/L *3 *3 H/L
*4 *4 *4 *4 *4
L L H H L
H L H/L
*4 *4 *6 *6 *6
*4 *4 *6 *6 *6
Function
TAPE
STOP FF REW LOADING
L L L L
PB ·
FF REW PB PAUSE
*7 *7 *7 *7
L L L L
H H H H
H H L L
L L L L
H H L L
*2 *2 *2 *2
*3 *3 *3 H/L
*3 *3 *3 H/L
*4 *4 *4 *4
H H H L
H L H H
*6 *6 *6 *6
*6 *6 *6 *6
TAPE PB ·
UNLOADING PB PAUSE SLOW
L *1 H H
PICTURE SEARCH
SLOW X2 CUE REVIEW REC
*7 *7 *7 *7 *7
L L L L L
H H H L H
L L L L L
L L L H L
L L L L L
*2 *2 *2 *2 *2
*3 *3 *3 *3 *3
*3 *3 *3 *3 *3
*4 *4 *4 *4 *4
*5 H H H H
H/*5 H H L H
*6 *6 *6 *6 *6
*6 *6 *6 *6 *6
PICTURE SEARCH
X2 CUE REVIEW REC
H H H L
REC ·
PAUSE
*7
L
H
L
L
L
*2
H/L
H/L
*4
L
H
*6
*6
REC ·
PAUSE
L