[sdiy] Kawai sx210 issues

[Dan Weal]

Thanks Oren
And all really helpful greatly appreciate it. 
I will give those a go

Best regards,

Dan

> On 22 Mar 2025, at 21:31, Oren Leavitt via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> I would disconnect the power supply from the other electronics and
> measure the voltages under a load (a power resistor or lamp, etc).
> Viewing the +/-15V +5V rails on an oscilloscope would also help you see
> any spikes or other transient anomalies.
> 
> - Oren
> 
>> On 3/22/25 1:33 PM, Dan Weal via Synth-diy wrote:
>> Hi Mike,
>> 
>> Great  idea I will try that. And see if  there is spikes
>> 
>> It has 30vac to the voltage regs for the +15v and -15v rail and 7vac
>> also  to another for the 5vdc output.
>> 
>> The voltages all look okay so really chasing my tail.
>> 
>> I really appreciate everyone’s reply.
>> 
>> 
>> 
>> Best regards,
>> 
>> Dan
>> 
>>>> On 22 Mar 2025, at 18:00, Mike Bryant <mbryant at futurehorizons.com> wrote:
>>> 
>>> 
>>> I think you need to get a scope on the power rails.  TL082s rarely go
>>> down so I suspect the power supply is putting out spikes or something
>>> way over the voltage they can handle.
>>> ------------------------------------------------------------------------
>>> *From:* Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Dan
>>> Weal via Synth-diy <synth-diy at synth-diy.org>
>>> *Sent:* 22 March 2025 16:34
>>> *To:* synth-diy at synth-diy.org <synth-diy at synth-diy.org>
>>> *Subject:* [sdiy] Kawai sx210 issues
>>> 
>>> Hi all,
>>> 
>>> Was really hoping someone can help.
>>> 
>>> I previously mentioned replacing the diode rectifiers in the psu due
>>> to them getting hot.
>>> 
>>> But it transpires there looks to be a problem with the 5v rail causing
>>> it to get hot.
>>> 
>>> I have Checked both cpu and voice board but I can’t find any issues.
>>> 
>>> Would anyone know what resistance is ohms I should be getting from the
>>> +15 and -15v rail. When I check I am getting 650 ohms. Is that right???
>>> 
>>> It’s weird because the synth was working then suddenly a few tl082 s
>>> went down I replaced them then it keep blowing the psu fuses.
>>> 
>>> Thanks all.
>>> 
>>> Best regards,
>>> 
>>> Dan
> 
> 
> 
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