230w 8 ohm approx replacement board of any kind 80vdc please help - diyAudio
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Old 5th February 2004, 08:38 AM   #1
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Default 230w 8 ohm approx replacement board of any kind 80vdc please help

Gday
I have a blown channel in my yamaha p2200. SO im hopefully gunna replace it with a whole new board. So does anyone know anyone with schematics, pcbs and directions on how to build a single channel of approximately 8 ohm into 230watts. It has to run off 80-0-80. Its dimensions must be approx 17X14cm and maximum height 7cm., and have full directions on how to build (i havent built an amp b4) It must be pretty simple and doesnt need anything fancy like dc protection.
Thankyou
Please contact me on priscared@hotmail.com
I have the board out of my yamaha amp for sale, or u can buy the whole amp for $200 aussie dollars. Im just gunna fix it slowly.
Daniel
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Old 5th February 2004, 09:24 AM   #2
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at these kinda power...u are onna need protection...and some kinda clipping indicator so u wun kill ur HF drivers...look at the M250 which has protection athttp://www.astro.uu.se/~marcus/private/m250.html
It's doable even without a PCB...I veroboarded a channel once...but never really got around to building it fully because I dun really need tt kinda power...
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Old 5th February 2004, 10:42 AM   #3
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Maybe a stupid question, but why not use the broken board and rebuilt the channel from scratch with the correct channel as model? At least then you will have two identical channels. And you already have the PCB, which fits exactly, you have the correct construction example, parts list, etc.

Jan Didden
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Old 5th February 2004, 10:53 AM   #4
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Yeah...that was my initial question...I guess he wants to sell part of it so he's got more $$$ to do the rest?? I'm not so sure...Yamaha is quite a good brand though...
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Old 5th February 2004, 11:25 AM   #5
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Quote:
Originally posted by li_gangyi
Yeah...that was my initial question...I guess he wants to sell part of it so he's got more $$$ to do the rest?? I'm not so sure...Yamaha is quite a good brand though...

...but from scratch will not be cheaper, and certainly more difficult and time consuming.

Jan Didden
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Old 5th February 2004, 11:37 AM   #6
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u're right...perhaps we should wait for his reply before we jump to conclusions...
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Old 6th February 2004, 11:13 AM   #7
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Default ?? Arrhhh you took it all wrong, im still looking for help though

Ok,
The board in it would be GREAT if i could get it to work. But no one can tell me what the transistors on it are, so therefore, im am going to try and replace the board. I wont be able to sell a blown board, It would definately be best if i could get the board in it to work, however it is almost 25 years old parts are hard to get. If anyone has any info on this board, or any parts, please contact me
priscared@hotmail.com
THankyou
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Old 6th February 2004, 11:47 AM   #8
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Default Re: ?? Arrhhh you took it all wrong, im still looking for help though

Quote:
Originally posted by priscared
If anyone has any info on this board, or any parts, please contact me

I have a hand drawn schematic of this amp. I will scan it and email it to you as soon as I get a chance.

Cheers.

Alternately, if you just want to rip the board out and send it to me I can fix for you as I have all the right test gear (ie no repeated blowups!)
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Old 8th February 2004, 01:15 AM   #9
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Default the schematic would be good , thanks.....

Could you please e-mail me regarding you repairing this amp. Although the schematic might help it still won't tell me how to get replacement parts. Thank you.
Kindest Regards,
Daniel.
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Old 3rd July 2004, 07:25 AM   #10
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Default got one

i got a brand new replacement board for it,, same model genuine yamaha, what are the ods??
Daniel
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