Vintage Synth Repair

I was told that you cannot/should not measure the voltage with a meter... but to use an a/c checker, like the neon screwdriver, which does light! As the neon lights I can hear the transformer start to buzz. 

There is one small transistor assocated with the transformer. Haven't checked it's temperature - should it be getting warm?

Also what should the frequency of the a/c output be?

Thanks for the suggestions guys.
TOM



--- In vintagesynthrepair@yahoogroups.com, NoëlBuhagiar <laser@...> wrote:
>
> Hi,
> 
> You could have low voltage at step-up transformer output.
> Transformer could have developed shorted turns.
> 
> Do the oscillator transistors get hot?
> 
> Good luck,
> Noel
> 
> 
> From: Quazimodo 
> Sent: Monday, July 16, 2012 6:52 PM
> To: vintagesynthrepair@yahoogroups.com 
> Subject: [vintagesynthrepair] Backlight Revisited...
> 
>   
> Hi folks,
> 
> I wonder if anyone has any ideas about this one.
> 
> I bought a new backlight for this Korg Wavestation EX... it didn't work. I checked the pins on the power supply feeding it... and it lit up one of those neon A/C test screwdrivers.
> 
> So I assumed the light was faulty and got a replacememt. Today I wired up the new backlight - on a loose wire, just to make sure it works and... nothing!
> 
> I am getting power on the connector... and I have two backlights that don't light on it.
> 
> Any ideas/suggestions please...?
> Cheers,
> TOM
>