Author Topic: Digital piano power repair - KORG concert 3500  (Read 6875 times)

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Offline tombaxter97Topic starter

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Re: Digital piano power repair - KORG concert 3500
« Reply #25 on: February 01, 2018, 05:29:03 pm »
Great thanks for the help.

About the connector, what I got is the C7 so I don't have that third connection.
 

Offline Zucca

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Re: Digital piano power repair - KORG concert 3500
« Reply #26 on: February 01, 2018, 10:24:12 pm »
Do you have a multimeter?

because the Fuse F702 looks open to my poor eyes.
Can't know what you don't love. St. Augustine
Can't love what you don't know. Zucca
 

Offline tombaxter97Topic starter

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Re: Digital piano power repair - KORG concert 3500
« Reply #27 on: February 01, 2018, 10:35:44 pm »
Yes, I will check it tomorrow then. May be more down to the poor resolution than your poor eyes!
 

Offline Richard Crowley

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Re: Digital piano power repair - KORG concert 3500
« Reply #28 on: February 02, 2018, 03:00:20 am »
If you acquired the gadget locally, it is probably already strapped for 240V.
A better look at the far right side of the transformer would be helpful.
Your photo cuts off the critical part that shows the primary connections.

Of course, if it is strapped for 100V or 120V, and you plug it into your 240V mains, you will kill it.
 

Offline tombaxter97Topic starter

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Re: Digital piano power repair - KORG concert 3500
« Reply #29 on: February 20, 2018, 03:42:33 pm »
Referring to Helius' message.

After a long month of other things not relating to this - as usual - I am going to finally get this done.

Decided to use the three pronged receptacle, so i will need to attach the green earth cable to that brass screw you mentioned (On attached imaged have i circled the correct screw? can confirm it does have continuity with chassis below)

Do you mean these spade terminals? http://theinstallbay.com/subcategory/IB-CONNECTORS/IB-RING_TERM_STAR

Just solder earth to spade then screw this on?

Thanks sorry for this ongoing nightmare.
 

Offline Richard Crowley

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Re: Digital piano power repair - KORG concert 3500
« Reply #30 on: February 20, 2018, 05:08:39 pm »
I see no "attached image"?

Just open speculation:  If you are referring to the screws that attach that AC entry circuit board, then no, those are NOT proper for connecting the PE terminal.

The convention is to attach it to a bolt directly against the metal chassis.  Not through a PC board and a spacer (which could be plastic for all we know?)

It is also against the convention to solder to the lug.  The convention calls for crimping, not soldering.

OTOH, you could just leave the PE pin unconnected.  Or just use an IEC C18 connector:

 

Offline tombaxter97Topic starter

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Re: Digital piano power repair - KORG concert 3500
« Reply #31 on: February 20, 2018, 09:02:51 pm »
Oh sorry this.
 


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