[sdiy] SCI Pro One 15+ power rail

[Barry Klein]

Just found a shorted multilayer ceramic this way on a server board last week. Took 30 seconds.
What, you don't have an IR camera?  One coming on Indiegogo for $150....   :-)

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Tony Kalomiris
Sent: Tuesday, August 27, 2013 1:53 PM
To: Synth DIY
Subject: Re: [sdiy] SCI Pro One 15+ power rail

You could try replacing the 15 V regulator, seeing you replaced the tantalums already.
Or isolate the PSU from the rest of the electronics to know if something is shorting out.
Touch the regulator to see if it's getting hot. is the +5 V ok, it's fed from the same full wave rectifier.
You didn't say what the input voltage was at.

I like Barry Klein's suggestion, for people with a well equipped bench.
IR camera eh ? hmm

Tony K


> 
> On 8/28/2013 6:37 AM, Csaba Zvekan wrote:
>> HI John ,
>> 
>> All the tantalum caps have been replaced by electrolytics. I also removed all the socketed IC's hoping that the voltage comes back to +15V.  Now I will measure OP-AMPS power and see if I have a low resistance.
>> Can I do the same with the CEM3310 and CEM 3320. And most of all can I do it in circuit ? I could go ahead and socket and replace all new OP-AMPS I'm still guessing that's not my problem.
>> I'll double check the bypass caps again.
>> 
>> Csaba
>> 
>> 

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