K5synth

Hello all, 
I was playing my K5 earlier today (through the headphones) when it
made a "crack/pop" sound.  The volume level then dropped, and now when
I play a loud Multi (such as loud horns or loud strings) the output
distorts.  Sigles now seem quiter.  In fact, it seems that all the
outputs (headphones, mix, 1-4) are all now a lot quiter.  Everything
else seems to work perfectly.

I think an op-amp or part of the amp circuit went out.  Any ideas out
there on what my problem is and how to fix it?  Does anyone know which
op-amp controls the headphones (IC1, 4, 8 and 9 or something else)? 
If one of these ICs went bad I guess I have to replace it - but I need
to isolate the problem and change only the bad parts. (It doesn't look
like it will be a lot of fun changing out one of these ICs.)


Also, I plan on doing the 147k resistor hack very soon.  Any chance
this will fix the problem?  

By any chance, does anyone have schematics for the k5 they could turn
in to a .pdf and post?  That would help me a lot in seeing what the
problem might be.

Thanks in advance for any advice.

Have you tried my PSU trick? (Desolder every joints and put new solder) 
Maybe it will fix your problem, once in the headphones I had an 
unsupportable hum until I've done this. Check if the volume slider has 
shorted, try shaking the connectors, if solder trick doesn't work try to 
remove inverter, and if nothing works try changing opamps(Try some 
OPA4134 if $$$ doesn't matter, they're supposedto have really low noise).

Note noise problem is noisy ground(Sounds digital
.

nelsonj_sce@... a écrit:

> Hello all,
> I was playing my K5 earlier today (through the headphones) when it
> made a "crack/pop" sound.  The volume level then dropped, and now when
> I play a loud Multi (such as loud horns or loud strings) the output
> distorts.  Sigles now seem quiter.  In fact, it seems that all the
> outputs (headphones, mix, 1-4) are all now a lot quiter.  Everything
> else seems to work perfectly.
>
> I think an op-amp or part of the amp circuit went out.  Any ideas out
> there on what my problem is and how to fix it?  Does anyone know which
> op-amp controls the headphones (IC1, 4, 8 and 9 or something else)?
> If one of these ICs went bad I guess I have to replace it - but I need
> to isolate the problem and change only the bad parts. (It doesn't look
> like it will be a lot of fun changing out one of these ICs.)
>
>
> Also, I plan on doing the 147k resistor hack very soon.  Any chance
> this will fix the problem? 
>
> By any chance, does anyone have schematics for the k5 they could turn
> in to a .pdf and post?  That would help me a lot in seeing what the
> problem might be.
>
> Thanks in advance for any advice. 
>
>
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-- 
antdes45@...

Well my k5 "got better", perhaps it was a problem with my headphones,
I hope.  Thanks for all the help on this issue.  I will let people
know how the 147k resistor thing goes.  Has anyone here done that mod?
 Are you happy with it?  
--- In k5synth@yahoogroups.com, "nelsonj_sce" <nelsonj_sce@y...> wrote:

> Hello all, 
> I was playing my K5 earlier today (through the headphones) when it
> made a "crack/pop" sound.  The volume level then dropped, and now when
> I play a loud Multi (such as loud horns or loud strings) the output
> distorts.  Sigles now seem quiter.  In fact, it seems that all the
> outputs (headphones, mix, 1-4) are all now a lot quiter.  Everything
> else seems to work perfectly.
> 
> I think an op-amp or part of the amp circuit went out.  Any ideas out
> there on what my problem is and how to fix it?  Does anyone know which
> op-amp controls the headphones (IC1, 4, 8 and 9 or something else)? 
> If one of these ICs went bad I guess I have to replace it - but I need
> to isolate the problem and change only the bad parts. (It doesn't look
> like it will be a lot of fun changing out one of these ICs.)
> 
> 
> Also, I plan on doing the 147k resistor hack very soon.  Any chance
> this will fix the problem?  
> 
> By any chance, does anyone have schematics for the k5 they could turn
> in to a .pdf and post?  That would help me a lot in seeing what the
> problem might be.
> 
> Thanks in advance for any advice.