[sdiy] sem repair

[Scott Gravenhorst]

I'm curious here, let's say it is a cap (perhaps more than one), a rail
to ground bypass cap, in parallel with a bunch of others.  I can't
think of any good "trick" that one could use to determine which cap or
caps is shunted or shorted.  The only way I can think to do this is to
lift one lead (and leave it lifted) of each and every one and ohm them
out or use a cap tester.  Is there a more clever way?


cyborgzero at comcast.net wrote:
>yes, definitely caps of some variety..
>
>I have seen things screw up a synth that defied logic.. But, 9/10,
>there is a cap out there dragging down a rail somewhere. ;)
>
>Rob
>
>----- Original Message -----
>From: "Gene Stopp" <gene at ixiacom.com>
>To: "synth DIY" <synth-diy at dropmix.xs4all.nl>
>Sent: Friday, July 19, 2002 5:50 PM
>Subject: RE: [sdiy] sem repair
>
>
>> Tantalum caps?
>>
>> Best Regards,
>>
>> - Gene
>>
>>
>> -----Original Message-----
>> From: mark verbos [mailto:a0284520 at addcom.de]
>> Sent: Friday, July 19, 2002 2:42 PM
>> To: synth DIY
>> Subject: [sdiy] sem repair
>>
>>
>> Hi,
>>
>> I am fixing an Oberheim SEM and need some guidance. The owner tried
>to
>> trim the V/Oct response and sharted something that caused the power
>> supply to blow up. I have replaced the 723 and got the power working
>> again, with the VCO's cut off from the power. However, when they are
>> connected, the positive rail drops from 15 volts down to 8 volts. I
>> can't check what's wrong with the VCO's if the power isn't working?
>What
>> could cause this? I have never seen a dead OP amp mess with the
>power
>> rail. could it? Anyone know this problem?
>>
>> please help!
>>
>> mark
>

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