Vintage Synth Repair

This is all from memory, so here goes the transistors are actually  
FET's. They are phsically very close to
the various output jacks. Again from memory they are J112 or J113.  
According to Kurzweil techs are not to be
substituted with anything else other than the original part nos. Are  
easily available and can be removed entirely
from the circuit if you dont mind loud pop/clicks in your amp when  
you power up and down the K2000.
On Nov 29, 2006, at 2:07 PM, david_flamant wrote:

>> ----- Forwarded message from laurent <lists@...> -----
>>     Date: Fri,  8 Oct 2004 09:41:22 -0700
>>     From: laurent <lists@...>
>> Reply-To: laurent <lists@...>
>>  Subject: [vintagesynthrepair] K2000 outputs blown
>>       To: vintagesynthrepair@yahoogroups.com
>>
>> Hello all,
>>
>> I just joined this board.
>> I recently bought a Kurzweil K2000 and am experiencing strange
> problems.
>> This Mix outputs are very low and the Headphone outs are very
> high, cliping at
>> medium volume.
>> A quick search on google revealed the following:
>> "This was a common problem on early K2000's. Later units had a
>> protection board installed (also available as a low cost upgrade
> for
>> older systems). Problem, as I recall, was that static electricity
> or
>> floating ground problems could blow the output transistors when
>> pluggin/unplugging cables to the unit.
>> There is a transistor on every output that mutes the output when
> you first
>> turn on the keyboard.  Static electricity can fry these.  If you
> plug in an
>> audio cable to the K2000, THEN plug that cable into an amp,
> chances are you
>> will short the tip of the plug to the chassis of the amp.  This
> will destroy
>> the transistor.
>> The remedy is to replace the transistor."
>>
>
>
> What is this transistor ?? where is it in the K2000 what is the
> number on k2000 electronic diagram ??
>
> Please help me I miss my K2000
>
> Best regards
>
> David
>
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> Yahoo! Groups Links
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