CASIO WK1200
Service Manual

DAC (IC1: UPD6379GR)
The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of the melody, chord, bass, and percussion for the right and left channels. The DAC converts the data into analog waveforms and output them to each channel separately.
Synch signal SINC 6.3 V220 µ L OUT Data SI Word clock 2.2 K LRCK CLK 2700 PF WCKO Bit clock BCKI SO DSP LSI2 HG51B277FB-1 Data SI Word clock WCKI Bit clock BCK LRCK SO SCK1 CPU LSI1 GT-913F

DAC IC1 UPD6379GR R OUT

FILTER BLOCK
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the waveforms.
AVDD 1 K 25C1740SS-TP-T 10 K Q308 Q310 AVDD 10 V22 µ AG 5600 PF 25C1740SS-TP-T

1K

1K

1K

22 µF

From DAC

To main volume

0.015 µF

AG

� 10 �

6.3 V100 µ AG

AG

AG

AG

AG

10 3.9 K