Vintage Synth Repair

Before I do something stupid, or blow something up - can I measure the 400Hz with the frequency counter on my digital meter, to see if it's there...?

Cheers,
TOM



--- In vintagesynthrepair@yahoogroups.com, "65 Lotus" <Lotus@...> wrote:
>
> 100 VAC @ 400 Hz.
> 
> http://retroactivesynth.com/index.php?page=backlight-mayhem
> 
>   ----- Original Message ----- 
>   From: Quazimodo 
>   To: vintagesynthrepair@yahoogroups.com 
>   Sent: Monday, July 16, 2012 7:53 PM
>   Subject: [vintagesynthrepair] Re: Backlight Revisited...
> 
> 
>     
>   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
>   >
>