<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Here is a video checking the voltages on an ESQ-1<div dir="ltr"><div class=""><div class=""><font color="#000000" style="background-color: rgba(255, 255, 255, 0);"></font></div></div></div><div><a href="https://vimeo.com/913986230/cafe0467aa">https://vimeo.com/913986230/cafe0467aa</a></div><div><br></div><div>When I boot there is an initial patch of electric piano. I hear when I first start up 3 or 4 notes, but the keyboard is unresponsive. All soft keys on the front panel are unresponsive. The diagnostics state - System Error 01 - soft reset. </div><div><br></div><div>So far I have replaced U39 with a new TL084, CR3 with a new 1n34A ; R15 with a new 1k 1% resistor; tempted to replace CR2 with a 1n34A or 1n270. CR3 measures 131 mV with the unit off; when on I measure 1.342V. </div><div><br></div><div>The service manual states that I should check U14 + U18 V62C64P15L (6264 28pin) RAM; where I get </div><div>Pin 1: NC</div><div>Pin 2: 1.314v</div><div>Pin 3: 2.721v</div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 4: 2.797v</span></div><div><div>Pin 5: 2.712v</div><div>Pin 6: 2.66 v</div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 7: 2.6 v</span></div></div><div><div>Pin 8: 1.314v</div><div>Pin 9: 2.721v</div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 10: 2.797v</span></div><div><div>Pin 11: 2.712v</div><div>Pin 12: 2.66 v</div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 13: 2.6 v</span></div></div></div><div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 14: 34mV / 33mV</span></div><div><div>Pin 15: 2.712v</div><div>Pin 16: 2.66 v</div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 17: 2.6 v</span></div></div></div><div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 18: 2.797v</span></div><div><div>Pin 19: 1.582 v</div><div>Pin 20: 3.462v / 4.416 v</div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 21: 1.84 v</span></div></div></div><div><div>Pin 22: 2.028 v</div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 23: 1.611 v</span><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"> </span></div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 24: 2.574 v</span></div></div><div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 25: 2.698 v</span></div><div><div>Pin 26: 4.844v</div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 27: 4.032 v</span><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"> </span></div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Pin 28: 4.474v</span></div></div></div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><br></span></div><div>I really don’t want to replace the main board, I’m wondering if I should start recapping all the 3.3 UF electrolytic capacitors. Has anyone else encountered these issues somewhere along the way I’ve read most of Rainer Buchty’s site, and I cannot seem to find anybody else with this issue.</div><div><br></div><div>Thanks,</div><div><br></div><div>Todd</div><div><br></div><div><br></div></body></html>