Vintage Synth Repair

Hi guys,

Only just got around to checking this... when I use the frequency counter on my digital meter it reads: 2.6Khz

So I assume that's my problem - the next question would be any ideas what might be causing this?

Cheers,
TOM




--- In vintagesynthrepair@yahoogroups.com, "65 Lotus" <Lotus@...> wrote:
>
> Yes, that should work. An oscilloscope would be the better way of course, but the meter should read it fine if the voltage is there.
> 
>   ----- Original Message ----- 
>   From: Quazimodo 
>   To: vintagesynthrepair@yahoogroups.com 
>   Sent: Wednesday, July 18, 2012 12:27 PM
>   Subject: [vintagesynthrepair] Re: Backlight Revisited...
> 
> 
>     
>   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
>   > >
>   >
>