[sdiy] wavestation backlight whine hack

[cheater cheater]

Really? Where was it? I have never noticed that option! Will have to
check it out.

D.

On Mon, Aug 23, 2010 at 14:57, Graham Atkins <gatkins at blueyonder.co.uk> wrote:
> Hi Nicolas,
>
> There was audible "whine" on the output of the classic PPG Wave synth from
> the backlight inverter. When the "Soft" PPG
> Wave 2.V was created, it allowed you to mix in an amount of whine for
> authenticity !!.
>
> Graham
>
> On 23 Aug 2010, at 10:05, nicolas wrote:
>
>> Hello
>>
>> Just in case anyone here is interested I thought I would relay a simple
>> hack just completed ...
>>
>> I have a Korg Wavestation EX with dead backlight, which had the annoying
>> whine that so many of them have now.  I don't really need the backlight
>> enough to be bothered fixing it properly, but the whine was really annoying.
>>  The whine is from the inverter that powers the backlight.  Disconnecting
>> the dead backlight raises the pitch of the inverter to be less annoying, but
>> doesn't stop it.  I read on the net that one person went so far as to remove
>> the relevant transformer, but that seemed a bit drastic, required getting
>> the board out of the synth and a pain to reverse if I ever wanted to return
>> it to original.
>>
>> A much simpler fix is to cut the power supply to the inverter.  This can
>> be done without removing the board.  The inverter in the EX is on the power
>> supply PCB in the corner opposite where the mains comes in.  The DC power to
>> the inverter arrives via a wire link that can be cut without having to
>> remove the board from the synth.  Cutting the link fixes the whine and is
>> also easily reversible if you ever want to return the backlight to original.
>>
>> To open the wavestation flip it over and undo all the screws on the
>> bottom.  There are a lot.  Then slide that bottom panel away from the back
>> panel and lift it off.
>>
>> To identify the wire link, look for the small transformer in the corner of
>> the power supply PCB opposite where the mains comes in.  Just to north of it
>> there are some big electrolytics, to the east the connectors taking power to
>> the synth, to the south a small cap and a small transistor.  And to the west
>> of it a wire link then a couple of resistors, all quite close together.
>>  That wire link between the transformer and the pair of resistors is the one
>> to cut.  Its a bit fiddly to cut because it is so close to the transformer,
>> but easier than removing the board.
>>
>> Cheers,
>> Nicolas
>>
>>
>>
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>