Akai VS-2EGN

3-6 AUTO DISCRIMINATOR CIRCUIT
3-6-1
MICROCOMPUTER
CONFIGURATION
AFC
-R PORT
NTSC 358: i
50 Os:
60 0S:
L wo
Fig. 7-62 MB8841-1041J
PORT|PIN No. | I/O |ACTIVE| PORT NAME COMMENT
Oo} 13 | OUT L AUTO AUTO LED ON
O; 14 OUT L PAL PAL LED ON, control signal to video circuit
O,|
15
|
OUT
i
SECAM
B/G
|
SECAM
B/G
LED
ON,
control
signal
to
video
circuit
O3;|} 16 | OUT L NTSC 4.43 | NTSC 4.43 LED ON, control signal to video circuit
O,| 17 | OUT L SECAML | SECAML LED ON, control signal to video circuit
Os 18 OUT L NTSC 3.58 | NTSC 3.58 LED ON, control signal to video circuit
O.| 19 | OUT L 5008S 50 Hz control ‘
O,| 20 | OUT L 6008 60 Hz control
Ro| 22 our! L/H NT-L Control signal to servo circuit )
Ry 23 IN L/H KEY Signal supplied by manual operation of touch buttons
R,| 24 | IN CUE “L”: CUE
R3} 25 | IN REV “L”: REVIEW
Ry 26 IN NC NOTE 1
Rs| 27 IN V SYNC V. SYNC. SIGNAL
Re 28 IN PB 12V H: PB MODE L: E-E MODE
R,| 29 IN N-C we.
Rg | 30 IN VI VIDEO SIGNAL
TC 8 IN AFC AFC (H. SYNC.) PULSE
IRQ 4 IN swP Detection of Switching Pulse trailing edge
Ky| 38 IN CK-1 COLOR KILLER-1 H: PAL or NTSC 4.43MHz
K,| 39 IN CK-2 COLOR KILLER-2 H: NTSC 3.58 MHz
K,| 40 IN SD-1 SECAM DETECTOR-1 H: SECAM B/G
K;| 41 IN SD-2 SECAM DETECTOR-2 H: SECAM L
Fig. 7-63 Description of I/O Port
*1:
The
discrimination
level
in
the
CUE/REVIEW
mode
is.changed
by
bringing
this
port
to
‘L’
or
‘H’.
Service Manual VS-2EGN
54