<p dir="ltr">Hey Scott, <br>
Thanks for checking this for me and confirming. It's unlikely that a cap will short unless it's a safely cap - especially an electrolytic - More likely will go open. But I'll check the others. Probably a bad chip somewhere that's being pulled low. Maybe a tantalum is more likely to short? Then there are the three video chips which may have a fault. I would need to buy a tool to pull them without damaging them. I'll also have a look at my 3/160 board and see if I can find some visual similarities. At least there is a schematic available for it which may give me some clues. The 3/60 also has a schematic available but its too dissimilar to the 3/110.</p>
<p dir="ltr">-Kurt</p>
<div data-smartmail="gmail_signature">-Kurt</div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sun, Jan 26, 2025, 13:01 Scott Quinn via rescue <<a href="mailto:rescue@sunhelp.org">rescue@sunhelp.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-family:Arial,Helvetica,sans-serif;font-size:16px"><div></div>
</div><div id="m_5900560418950870048ydpa53135e3yahoo_quoted_8238298143"><div style="font-family:Arial,Helvetica,sans-serif;font-size:16px"><div style="font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;font-size:13px;color:#26282a;border-left:1px solid #ccc;padding-left:8px;margin:0px 0px 0px 8px"><div><div dir="ltr"><br></div><div dir="ltr">Kurt wrote:</div><div dir="ltr">About a year ago I lost video output on my 3/110 and I'm back to trying to<br></div><div dir="ltr">find the fault. Not so easy on a VME bus machine. Yesterday I noticed a<br></div><div dir="ltr">short across the large 470 ufd electrolytic capacitor near the battery of<br></div><div dir="ltr">the CPU board (270-1134-03). I desoldered the cap and it tested fine and<br></div><div dir="ltr">noticed that the short is across the vias of the cap. Since a schematic of<br></div><div dir="ltr">this machine is pretty much unobtainable I was wondering if another 3/110<br></div><div dir="ltr">owner out there would be kind enough to test the continuity across this<br></div><div dir="ltr">cap. Thanks.<br></div><div dir="ltr"><br></div><div dir="ltr">-Kurt<br></div><div dir="ltr">-------------- next part --------------<br></div><div dir="ltr">An HTML attachment was scrubbed...<br></div><div dir="ltr">URL: <<a href="http://sunhelp.org/pipermail/rescue_sunhelp.org/attachments/20250119/68d2e7a2/attachment-0001.html" rel="nofollow noreferrer" target="_blank">http://sunhelp.org/pipermail/rescue_sunhelp.org/attachments/20250119/68d2e7a2/attachment-0001.html</a>><br></div><div dir="ltr"><br></div><div dir="ltr"></div></div></div><div style="padding:12px 0px"><div style="font-family:Arial,Helvetica,sans-serif;font-size:16px"><br></div><div style="font-family:Arial,Helvetica,sans-serif;font-size:16px" dir="ltr">I pulled the board out of my /110 and also grabbed the spare that has one of the video channels go out after a bit, on both of them the ohmmeter reads open circuit across that cap lead :(. On the plus side it might not be the board itself, as that capacitor is probably across the power planes, but there are a lot of other capacitors and stuff that you will need to rule out. </div></div><div style="font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;font-size:13px;color:#26282a;border-left:1px solid #ccc;padding-left:8px;margin:0px 0px 0px 8px"><div><div dir="ltr"><br></div></div>
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