[sdiy] Casio CZ-3000 with mains to chassis fault

Tom Wiltshire tom at electricdruid.net
Tue Aug 31 00:54:09 CEST 2021


Static shocks get worse with low humidity, so weather is more of an issue than wiring!

It’s August. I’m guessing you’re in the northern hemisphere so you’re somewhere that’s having summer now and it’s pretty hot and dry.

> On 30 Aug 2021, at 23:31, cheater cheater via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> Yeah, I just unwrapped it. Could well be. But the shock was pretty
> damn huge. Can this effect be compounded by mains capacitors being
> connected to chassis through ground? Should I bridge them with 1MR
> shunts?
> 
> On Mon, Aug 30, 2021 at 6:43 PM Richie Burnett
> <rburnett at richieburnett.co.uk> wrote:
>> 
>> Sounds more like a static electricity shock to me, if it wasn't connected to anything at the time and you had just been removing plastic packaging etc.
>> 
>> -Richie,
>> 
>> Sent from my Xperia SP on O2
>> 
>> ---- cheater cheater via Synth-diy wrote ----
>> 
>>> Hi all,
>>> I have just unwrapped a new-to-me Casio CZ-3000, which seems to be in
>>> excellent condition cosmetically. As I was unwrapping it, the metal
>>> chassis gave me a pretty strong shock. I assume that was the mains
>>> capacitor unloading into the chassis and ground. The keyboard wasn't
>>> plugged in and hasn't been plugged in for weeks. I was wondering if
>>> anyone knew of any common faults that this keyboard might have that
>>> would cause this.
>>> 
>>> Best regards
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