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Old 9th June 2009, 05:08 AM   #1
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Default HELP Trio L07M11

Help sorrow!

My Kenwood/ Trio mono block just died.

I never smelled anything or heard any untoward noise but when I noticed my subwoofer wasn't working.

I just pulled the covers off the amp and I have found a big ( 1cm ) hole in the circuit board, but no apparent exploded components, does look overheated tho

Is there any-one here with experience in the old classic trios??

Is it worth trying to find a replacement board or is it possible to have a new one made??

Any Aussies living in Geelong or close by able to help??
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Old 9th June 2009, 08:00 AM   #2
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Default Picture of hole

It's big, 1.5cm across, must have got very hot.

http://farm3.static.flickr.com/2443/...4d02fb.jpg?v=0
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Old 9th June 2009, 09:11 AM   #3
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Default Re: HELP Trio L07M11

Quote:
Originally posted by Moondog55

Is it worth trying to find a replacement board or is it possible to have a new one made??



Finding a new board is extremely unlikely. The damage in any case seems easily repairable. But is this the reason the amp is not working? I find it very strange that anything can burn through the board without leaving smell, fireworks or pieces of dead components behind. Can you do basic troubleshooting? Is the damage in the PS area? Maybe a power surge caused the loss of incoming AC power. It may turn out to be trivial to repair.
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Old 9th June 2009, 09:32 AM   #4
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While able to work cross-overs and build speakers I find myself totally out of my depth with electronics.
I'm without even those basic troubleshooting skills.

Learning electronics and how to build and repair amplifiers was going to be my next 10 year plan.

I made the mistake of leaving the system switched on overnite, but the smell of burnt Bakelite lingers in the casing but no, I found nothing inside but a greasy residue, soot I suppose, inside the case
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Old 9th June 2009, 09:43 AM   #5
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Although the damage may be quite minor, this amp is complex and not worth using as a test bed. Your best option would be finding someone from your neighbourhood to have a look. Best of luck.
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Old 9th June 2009, 10:16 AM   #6
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Thanx, that is what you get for buying old amps.

Must say when it was working it was superb and I have been using it now for 4 years, that works out at $80 per year
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Old 9th June 2009, 11:03 AM   #7
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If you need schematic for Kenwood L-07MII and Kenwood L-07M service manual, drop me an email via PM.
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Old 9th June 2009, 11:33 AM   #8
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Thank you

'YGM
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Old 9th June 2009, 12:09 PM   #9
Stuey is offline Stuey  Australia
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Hi Ted,

You might also try Audiokarma, which is good for this sort of 'classic' gear.

I think Echowars has some experience with this unit, from having a quick look at AK.

Good luck

Stuey
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Old 10th June 2009, 05:22 AM   #10
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Thanks Stuey;
i'll try there as well
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