[sdiy] Need help about how to service an amp

Eric Frampton eric at ericframpton.com
Sat Apr 3 23:24:07 CEST 2021


And it should be noted that, unlike many companies, Peavey is really friendly about sending out PDF’s of their old schematics. If you can’t find it online, it’s worth emailing their tech support department.


> On Apr 3, 2021, at 3:50 PM, cheater cheater via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> you shouldn't be running it without a load.
> 
> get a schematic and start there.
> 
> my guess is it's going to be the power transistors. check if any of
> them are shorted.
> 
> On Sat, Apr 3, 2021 at 8:56 PM Jean Bender via Synth-diy
> <synth-diy at synth-diy.org> wrote:
>> 
>> Hi list !
>> 
>> A friend gave me a Peavey KB100, not working, i mean it's powering up but no sound, even in the headphone output.
>> 
>> Well, i realise in don't know from where to start when you have to service an amp. Is there a specific way to work once you have check all the basics (fuses, power supply, and visual check up around caps and chips) ?
>> 
>> Do i need, for example to simulate the speaker impedance if i disconnect it from the board for troubleshooting the circuit ?
>> 
>> So this thread is more to have tips, readings about this kind of thing, since i don't feel really comfortable working on it from scratch knowledge !
>> 
>> Thanks per advance
>> J.
>> --
>> Jean Bender
>> 
>> Hak Lofi Record
>> 
>> 
>> 
>> 
>> 
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