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

Richie Burnett rburnett at richieburnett.co.uk
Tue Aug 31 11:21:35 CEST 2021


Did you hear a "snap" or "click" sound when you felt the shock?

-Richie, 

Sent from my Xperia SP on O2

---- cheater cheater via Synth-diy wrote ----

>Hmm, I mean, I can see that, but this hurt way more than the mains
>shock I got a couple years back. Makes sense given that static is
>higher voltage... just surprising... I guess the thing is a piece of
>metal surrounded by plastic paneling, seems like a great way to build
>a Leyden jar...
>
>On Tue, Aug 31, 2021 at 12:54 AM Tom Wiltshire <tom at electricdruid.net> wrote:
>>
>> 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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