AIWA AV-D50
Service Manual

IC, LC74763M-9670
Pln No. 1 2 3 Pin Name Vss Xtal IN1 Xtal OUT1 I/o � I o Connected to ground For the connection of a crystrd and capacitors comprising a crystal oscillator that Description

generates internal sync signal. The crystal oscillator Outputs horizontal

is selected by command. can be selected (Metal

sync signal. (AFC) The output polarity port output (switched

4

HSYNCOUT

o option). Or, general-purpose by command). a crystal oscillator that

5 6 7

Xtal IN2 Xtal OUT2 VSYNCOUT

I o o

For the connection

of a crystal and capacitors comprising

generates internal sync signal. Outputs vertical general-purpose sync signal. The output polarity can be selected (Metal option). Or,

port output (switched by command).

Enable input for serial data input. �L� input enables serial data input (hysteresis input). 8 Cs I A pull-up resistor is incorporated 9 SIN I (Metal option). (Metal option).

Serial data input (hysteresis input). A pull-up resistor is incorporated

Clock input for serial data input (hysteresis input). A pull-up resistor is incorporated 10 SCLK I (Metal option). nput: Switches the SECAM 11 SECAM IJo Output General-purpose port output or internal V output (switched by command). mode. �L�: Modes other than SECAM, �H�: SECAM

InpuE Switches the number scanning lines between 525 and 625. �L�: 525, �H�: 625 12 525/625 I/o Output General-purpose port output or character data output (switched by command).

Inpu~ Switches the color system between NTSC and PAL. �L�: NTSC, �H�: PAL 13 NTsc/PAL I/o Outputi General-purpose command). Inputi Switches FSC between 3.58MHz 14 3.58/4.43 I/o Genem-purpose port output or half-tone output (switched by command). and 4.43MHz. �L�: 3.58, �H�: 4.43 Output port output or decorating data output (switched by

System reset input. Active 15 RST I (Metal option). 16 17 18 19 20 21 22 23 24 25 26 27 28 CV OUT VDD2 CVIN CVCR SYNC IN SEPC Vss PD OUT AMP IN AMP OUT FC VCO IN VCO OUT o � I I I o � o I For the connection o I I For the connection o EX-NOR 29 SYNC DET o AFC control voltage input Composite

�L�. (Hysteresis input) A pull-up resistor is incorporated

video signal output

Power supply for creating composite video level Composite SECAM video signal input

chroma signal input sync separator

Video signal input to the built-in Bias output from the built-in Connected to ground. AFC control voltage output

sync separator

of a filter for AFC circuit

of coils and capacitors comprising

an LC oscillator

for VCO

output of horizontal

sync signal (AFC) and C.SYNC

(sync sepmator). The port output

output polarity (switched

can be selected (Metal option). Or, general-purpose

by command).

30

VDD1

�

+5V Power supply of digital circuits