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</o:shapelayout></xml><![endif]--></head><body lang=FR-CA link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoPlainText>I’m working on a Yamaha Clavinova CVP900<o:p></o:p></p><p class=MsoPlainText>That has its right channel dead.. no sound.<br>The left channel is ok.<br>So, looking at the <b><u>attached PDF file from Yamaha</u></b>,<o:p></o:p></p><p class=MsoPlainText>They stated that a common issue was found on PCM1702 DAC’s used<br>on the main digital board. Noise or no sound at all can be encountered.<o:p></o:p></p><p class=MsoPlainText>I checked both DAC and, effectively DAC IC29 had no sound<br>to its opamp (pin 7 on IC43).<o:p></o:p></p><p class=MsoPlainText>The only ‘I thought reliable’ source to buy a PCM1702 I found<br>was <b>Syntaur USA</b> at $36.95 each.<o:p></o:p></p><p class=MsoPlainText>To make sure I ordered two. Ok.<o:p></o:p></p><p class=MsoPlainText>So I carefully removed the bad IC29 and soldered a new one.<o:p></o:p></p><p class=MsoPlainText>The result ? Now both channels were dead !!<o:p></o:p></p><p class=MsoPlainText>I thought I could have done something on the main board<br>while replacing the bad chip.. So I desoldered it and powered back the unit.<o:p></o:p></p><p class=MsoPlainText>The left channel only came back alive… Hmmm…<br>So I picked the second DAC I had left on hand and soldered it<br>on the board.. Again both channels dead !!!<o:p></o:p></p><p class=MsoPlainText>So 2 things could be happening.<o:p></o:p></p><p class=MsoPlainText>New Fake PCM1702 IC’s that load the common data buses (QCLK, WCLK) when installed<br>and keep the good DAC from working.. ?<o:p></o:p></p><p class=MsoPlainText>Or the driving IC that brings QCLK and WCLK to both DAC’s<br>that is getting weak and drop when 2 DAC’s are installed (That I doubt).<br>By the way I had no way to check digital waveforms on both DAC’s<br>beacause they are placed underneath a big daughter board.<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>So what do you think about that ?<o:p></o:p></p><p class=MsoPlainText>Hmmm. <o:p></o:p></p><p class=MsoPlainText><span style='mso-ligatures:none'><img width=816 height=657 style='width:8.5in;height:6.8437in' id="Image_x0020_2" src="cid:image002.jpg@01DA2439.E56D1CC0"></span><o:p></o:p></p></div></body></html>