DAEWOO DVK580DZT
Manual de Servicio

CIRCUIT OPERATION

1-3) PB MODE
When playing the tape, the signal which is picked up from the tape is amplified 60 dB. Then luminance signal goes to pin 11 and color signal goes to pin 7 through AGC. Luminance signal of pin 11 is input to pin 39 of IC301 through PB EQ circuit in order to match playback characteristic. Color signal which is output from pin 7 of IC401 is input to pin 15 of IC301. PB FM signal is demodulated by IC internal demodulator then it is output to pin 3 after MAIN DE-Emphasis process. If this output signal has burst, color component will be separated by emphasis circuit. The signal which is input to pin 4 is output from pin 12 through 3.5M LPF, then it is input to pin 10 through 2H CCD. Color signal which is input to pin 15 passes ACC in order to stabilize level, then 4.43M components will be extracted by 4.43M BPF through Main Converter. This 4.4Mhz color signal removes crosstalk component through X302 and is input to pin 29 of IC301 then it will be mixed with luminance signal after passing CNR circuit. Finally Y/C composite video signal is output from pin 34.

X302 2H DLY
V-OUT

V.IN

IC301 VIDEO IC Y-EMPH

PB EQ

IC401 HEAD AMP

IC302 2H CCD

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