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Old 27th May 2013, 12:23 AM   #11
timwebb is online now timwebb  United States
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do it have 12 across it?
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Old 27th May 2013, 02:22 AM   #12
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Quote:
Originally Posted by timwebb View Post
do it have 12 across it?
it's a 9v relay and nope, no voltage across it. the relay works. I tested it with a bench supply and the surrounding parts are good. I'm sure it burnt up what ever parts that sense the output for DC. But I got tired and will look at it again tomorrow. I haven't figured out how they sense the output yet. or...I am assuming it has a protection circuit of some sort to sense DC at the output. It may just be a time delay or may be some function from the class-D controller IC. But I can view the signal ahead of the relay and it looks fine.
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Old 1st June 2013, 04:57 PM   #13
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poking around with it today I managed to get the protect relay to kick in...have no idea how, but I noticed that there is a 4.7uf cap in the power supply section that gets really hot! it appears to be a bipolar EL cap...sure wish i had a schematic....


ANYONE have ANY Eclipse schematics?? maybe one has a similar TL494 based power supply??
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Old 1st July 2013, 02:59 AM   #14
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Well I had this running tonight...had....

It seems i forgot to check the driver transistors for the power supply mosfets and one was shorted. so the amp would run, but the TL494 was driving a 10 ohm load on one side so it was drawing excessive current from its power supply drawing it down to the point where there was only 6v to try and pull in a 9V relay! once I fixed the near shorted driver transistor the amp ran fine and pulled in the speaker relay just fine etc. BUT. I was just running it with one IRF640 and one IRF9640 output mosfet as that's all i had on hand until i could order some. so after getting it running. I pulled out the singles and put in matched sets and well now it doesn't run. I pulled the board back out and I don't see any shorts. But I was tired and i just called it a night.

The only other thing I can think of...and I have NO idea why this would be a factor. is that the singles were genuine IR parts. the replacement 640's are IRF640N and the 9640s are Vishay/Siliconix parts all sourced from Digikey. so no idea why the N vs non N parts would make a difference or why the Vishay parts would make any difference...but...I must have missed something...tomorrow...but it's progress at least....
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Old 3rd July 2013, 12:07 AM   #15
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GOT IT FIXED!!!! turns out it way my error after all sort of... I Managed to find some genuine IR 640 and 9640 Non "N" Parts and i started off by putting in one 640 and one 9640 and it ran. so I tried 2x 640's and noticed that the turn on surge was a bit higher but it again ran. So 2x 640 and 2x 9640's and it again ran but this time it had a much bigger turn on surge!

So 3x 9640's and 2x 640's (this is the way the amp is built) and the amp won't run....But seeing as how the turn on surge got bigger and bigger each time I added a fet I started to suspect that my little bench supply was really the problem. so I dig out the big supply and low and behold the amp fired right up and ran just fine! Walla! done!

All back together and managed to squeeze a solid 400 watts at 4 ohms out of it at 100hz. I would call that good..

off to eBay it goes!

Zc
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Old 3rd August 2013, 10:01 PM   #16
rickcl is online now rickcl  United States
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I got mine fixed too. I would just like to do on record and post the symptoms for future benefit. I finally got mine to turn on about every other power-up. Half the time it would power into protection and the other half it would work. I finally thought I would replace all the outputs. That did the trick. I think one of the bunch could have been leaky. The IRF640s (2) didn't even have the same date code. I think that might do it for Eclipse for me.
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