layums
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Post by layums on Aug 6, 2012 21:27:27 GMT
Hi everyone. I'm new on here. Bit of a fix nut but not so with electronics, not yet anyway..... I have a rsa hornet head amp. It's blown a component. As per picture. Any ideas how to fix it and what the little fella at D3 is? flic.kr/p/cLWans
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jonclancy
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Post by jonclancy on Aug 6, 2012 21:32:23 GMT
Can't see your image, old boy.
Welcome, nevertheless.
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layums
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Post by layums on Aug 6, 2012 21:54:00 GMT
Should be fixed, it's on my flickr page. Any ideas. It's too expensive to send it off for fixing, want to do it myself also :-)
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layums
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Thank you for the untips
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Post by layums on Aug 6, 2012 22:02:11 GMT
Also to add, which may help. It works, but just sounds a little distant.
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jonclancy
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Post by jonclancy on Aug 6, 2012 22:19:12 GMT
Got it now, thanks!
D3 would be a surface mount rectifier diode, I reckon.
From 6 Moons:
The power supply features a huge 15,000microfarad filter capacitor with 3 rectifying diodes for regulation.
It appears to have blown. How did this happen? Charging fault or just blown. Ray Samuels would be able to tell you what part D3 is - unless you have a loupe or something similar (to see the component markings). I can't find a schematic as yet.
Cheers
Jon
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layums
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Thank you for the untips
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Post by layums on Aug 7, 2012 6:23:07 GMT
Hi. Ray offered to fix it buy requires postage there and back and the fixing cost. Might as well buy a new amp. That's why want to fix it myself. Thanks for the type of part from moon text. Will fish further.
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layums
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Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
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Post by layums on Aug 7, 2012 7:03:35 GMT
It was a charging fault. I had the battery in the wrong way. That's what happens when you rush. Here is a close image. Think the part number has been scrapped off by ray, some of the other components are painted over or top stripped also. flic.kr/p/cMc6Xy
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mrarroyo
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Post by mrarroyo on Aug 7, 2012 10:16:32 GMT
Perhaps Ray can send you the part and you solder it in.
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jonclancy
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Post by jonclancy on Aug 7, 2012 10:42:29 GMT
Reverse polarity would probably do that!! Part number hasn't been disguised - the part itself has gone POP!! SA53 - just looking for the part now. Should be an easy fix. We you going to replace the component yourself? If you have any doubts about SMD soldering, and if you're in the UK/EU for cheaper postage, I'll solder a replacement on for you.
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jonclancy
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Post by jonclancy on Aug 7, 2012 11:12:01 GMT
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layums
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Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
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Post by layums on Aug 7, 2012 11:12:23 GMT
Thanks for looking into it.
I fancy doing the job myself. Any tips you can giver on soldering part would be greatly appreciated too :-)
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layums
100+
Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
Posts: 111
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Post by layums on Aug 7, 2012 11:20:20 GMT
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layums
100+
Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
Posts: 111
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Post by layums on Aug 7, 2012 11:22:12 GMT
i take it as this is just part of the charging circuit, and would not effect original sound if an equivalent value part is used?
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jonclancy
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Post by jonclancy on Aug 7, 2012 11:23:27 GMT
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jonclancy
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Post by jonclancy on Aug 7, 2012 11:29:08 GMT
i take it as this is just part of the charging circuit, and would not effect original sound if an equivalent value part is used? Just seen that - I thought the body of a larger part had popped. No worries - just ignore the stuff above (but does have some excellent resources, so I'll leave them). Same spec part (and from a quality manufacturer) will perform fine. If you wanted to stay right in spec, then ask Ray what he used. I'm assuming this is a safety diode (that sacrificed itself unthinkingly to save the day!!) for the charging circuit and so would not affect the sound, but the 6Moons comment does refer to 3 regulating diodes. Without a schema, it's just a guess. Usually is WITH a schema, too!!! Easiest way to sort this would be to ask Ray and just blob a new part in.
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layums
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Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
Posts: 111
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Post by layums on Aug 7, 2012 11:30:40 GMT
oooo cool more toys required for smd. waiting for confirmation on part then i will dive in.......
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layums
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Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
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Post by layums on Aug 7, 2012 11:40:53 GMT
Mmm thanks for help. Which should I get. Checked the amp again later today. It plays and sounds good, so no other errors suspected. Which is the part do you all recon?
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jonclancy
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Post by jonclancy on Aug 7, 2012 21:29:44 GMT
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Post by pandapops on Aug 7, 2012 23:33:06 GMT
Looks like 3 diodes in a row, best to test the non-burnt ones just to makes sure they are still diodes.
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layums
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Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
Posts: 111
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Post by layums on Aug 8, 2012 13:04:55 GMT
To test you disconnect one end from circuit and check there is resistance going one way and not the other?
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Post by pandapops on Aug 8, 2012 20:49:32 GMT
Multi meters usually have a diode tesing function that is looking at resistance, disconnecting maybe necessary but I'd doubt it, depends on the circuit, try it the easiest way first. Also any polar electrolytic capacitor that had a reverse current could have been damaged, the underside of the PCB shot looked like there might have been one.
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layums
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Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
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Post by layums on Aug 10, 2012 6:32:14 GMT
Tested it. It's shorted. Allows stuff through both ways. But tested the next one in line and it's fine. Also connections between seem fine also.
The suggested replacements have been a little thick. Mine is about 0.5mm thick. But if it's job is only to stop flow the wrong way then spec is not too critical?
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Deleted
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Post by Deleted on Aug 10, 2012 7:28:49 GMT
That depends on whether it was a normal type diode or a Schottky diode.Schottky diodes have a much lower forward voltage drop. You really need to find out what the diode was. Alex
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layums
100+
Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
Posts: 111
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Post by layums on Aug 10, 2012 12:50:43 GMT
Ahh. I'm putting it on hold for a while. The amp works fine and charges ok. Just got to be careful not to be a prick and put battery in the wrong way.
maybe someone out there has a hornet and is willing to unscrew the front to read off D3 for me :-)
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layums
100+
Thank you for the untips
Just started electrical fixing, to go with my other fixing bad habits :)
Posts: 111
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Post by layums on Aug 13, 2012 7:43:36 GMT
Just had a leg up from headfi forum. It's a 2,4 Ohm resistor. Ring any bells for anyone?
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