Machiner 55 Posted June 7, 2013 Share Posted June 7, 2013 For those curious to what's inside the box. Link to comment Share on other sites More sharing options...
Guest Mc_Reatta Posted June 7, 2013 Share Posted June 7, 2013 Other than the electrolytic caps, looks pretty bulletproof.Did you discover the failure mode? Link to comment Share on other sites More sharing options...
Machiner 55 Posted June 7, 2013 Author Share Posted June 7, 2013 McR,No I haven't. The only thing I see that might have caused a problem is that one of the attachment lugs was cracked perhaps allowing the metal diaphragm to move out of position. I haven't looked at the traces and joints on the PC board under a microscope yet. May find something then. The one that I repaired years ago had a cracked solder joint on the bridge supporting the diaphragm assembly. I re-flowed the solder and it's been working ever since.John F. Link to comment Share on other sites More sharing options...
KDirk Posted June 8, 2013 Share Posted June 8, 2013 Well, that certainly isn't what I expected. It appears to be a hybrid electromechanical setup. I had always figured it was a small speaker (most likely a piezo element) with a small tone generator that had a decay circuit added to make the chime sound. This is something else again. The chime on my 88 is bad - I get a sickly squeal from it periodically, but that's it. Guess I am going in there and trying to fix it once removed. I rather suspect bad solder joints as the most likely failure mode. That said, the fact that there is some type of electromagnetic device involved has me questioning that hypothesis. KDirk Link to comment Share on other sites More sharing options...
SeanR Posted June 9, 2013 Share Posted June 9, 2013 Check the last pic on this article. The Ogre's Fiero Cave: Chime This! Link to comment Share on other sites More sharing options...
Machiner 55 Posted June 9, 2013 Author Share Posted June 9, 2013 SeanR,Yah, I failed to include a shot of the underside (may edit one in later) showing the traces and joints but, it's those joints (all of them are suspect) especially the ones connecting the diaphragm bridge to the board that need to be looked at. Just eye-balling them won't get it. A microscope comes in real handy for this job.Thanks for providing the link.John F. Link to comment Share on other sites More sharing options...
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