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2012-06-05 by Quazimodo
Hi guys, I am looking at a Korg Wavestation EX with currently no backlight. I bought a new backlight foil and installed it - but still no joy. I checked to see if the volts were there on the small plug feeding it and there's nothing. Can any one confirm for me please what voltage I should be getting? And also, would anyone know what could be a common fault on these for a lack of volts here? Cheers, TOM
2012-06-05 by narfman96
You should have around 100 volts ac on the plug coming from the inverter. It can be quite a bit higher if there isn't any load. Plus you should be able to hear the whine of the inverter. --- In vintagesynthrepair@yahoogroups.com, "Quazimodo" <noddyspuncture@...> wrote:
> > Hi guys, > > I am looking at a Korg Wavestation EX with currently no backlight. I bought a new backlight foil and installed it - but still no joy. > > I checked to see if the volts were there on the small plug feeding it and there's nothing. > > Can any one confirm for me please what voltage I should be getting? And also, would anyone know what could be a common fault on these for a lack of volts here? > > Cheers, > TOM >
2012-06-06 by Quazimodo
Thanks for the reply. Is there any way of confirming that the little transformer is shot. Should it be o/c with my meter? There is also a small transistor (2SC1815) feeding the transformer that could be suspect..!? Cheers, TOM --- In vintagesynthrepair@yahoogroups.com, "narfman96" <narfman96@...> wrote:
> > You should have around 100 volts ac on the plug coming from the inverter. It can be quite a bit higher if there isn't any load. Plus you should be able to hear the whine of the inverter. > > --- In vintagesynthrepair@yahoogroups.com, "Quazimodo" <noddyspuncture@> wrote: > > > > Hi guys, > > > > I am looking at a Korg Wavestation EX with currently no backlight. I bought a new backlight foil and installed it - but still no joy. > > > > I checked to see if the volts were there on the small plug feeding it and there's nothing. > > > > Can any one confirm for me please what voltage I should be getting? And also, would anyone know what could be a common fault on these for a lack of volts here? > > > > Cheers, > > TOM > > >
2012-06-06 by jammie
----- Original Message -----From: QuazimodoSent: Wednesday, June 06, 2012 7:17 AMSubject: [vintagesynthrepair] Re: Korg backlight problemThanks for the reply.
Is there any way of confirming that the little transformer is shot.
Should it be o/c with my meter?
There is also a small transistor (2SC1815) feeding the transformer that could be suspect..!?
Cheers,
TOM
--- In vintagesynthrepair@yahoogroups.com, "narfman96" wrote:
>
> You should have around 100 volts ac on the plug coming from the inverter. It can be quite a bit higher if there isn't any load. Plus you should be able to hear the whine of the inverter.
>
> --- In vintagesynthrepair@yahoogroups.com, "Quazimodo" wrote:
> >
> > Hi guys,
>; >
> > I am looking at a Korg Wavestation EX with currently no backlight. I bought a new backlight foil and installed it - but still no joy.
> >
> > I checked to see if the volts were there on the small plug feeding it and there's nothing.
> >
> > Can any one confirm for me please what voltage I should be getting? And also, would anyone know what could be a common fault on these for a lack of volts here?
> >
> > Cheers,
> > TOM
> >
>
2012-06-06 by Roger J
Around 130VAC +/- 10 would be typical at 350 to 450Hz. is what I would expect to see. No load will be higher than loaded by a few.
>________________________________ > From: Quazimodo <noddyspuncture@...> >To: vintagesynthrepair@yahoogroups.com >Sent: Tuesday, June 5, 2012 11:08 AM >Subject: [vintagesynthrepair] Korg backlight problem > > > >Hi guys, > >I am looking at a Korg Wavestation EX with currently no backlight. I bought a new backlight foil and installed it - but still no joy. > >I checked to see if the volts were there on the small plug feeding it and there's nothing. > >Can any one confirm for me please what voltage I should be getting? And also, would anyone know what could be a common fault on these for a lack of volts here? > >Cheers, >TOM > > > > >
2012-06-06 by Paul Krull
I spent my weekend digging through some synths that have not been used in a while and came up with lots of troubles on various synths. About the only repair I am capable of taking on myself is my very first synth: an ARP Odyssey with the 4035 filter which blew a fuse when I was handling it plugged in and turned on with a brittle and failing power cord. I can replace the cord and maybe even the fuse, except that I can't quite figure out what the deal is with the fuse holder or if there's a fuse holder at all. It looks like each end of the fuse is inserted into a metal cup that's soldered into the power supply board but there's no moving or dislodging the fuse from the holder. I might add that this Odyssey has been through an apartment fire 30 years ago so the insides are less than pristine though it's always worked faithfully for me so there's some chance that the metal has fused. Given that I've damaged several synths with my mucking around and that
I'm dealing with high voltages, should I just add that Odyssey to my pile of repairs for a professional to fix?
Thanks,
Paul T
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.2012-06-06 by Alexis V. Rogers
There's no holder. It's a leaded fuse. Search for a 250V 1/8A (.125A) fuse with axial leads. --- In vintagesynthrepair@yahoogroups.com, Paul Krull <paul.krull@...> wrote:
> >  I spent my weekend digging through some synths that have not been used in a while and came up with lots of troubles on various synths. About the only repair I am capable of taking on myself is my very first synth: an ARP Odyssey with the 4035 filter which blew a fuse when I was handling it plugged in and turned on with a brittle and failing power cord. I can replace the cord and maybe even the fuse, except that I can't quite figure out what the deal is with the fuse holder or if there's a fuse holder at all. It looks like each end of the fuse is inserted into a metal cup that's soldered into the power supply board but there's no moving or dislodging the fuse from the holder. I might add that this Odyssey has been through an apartment fire 30 years ago so the insides are less than pristine though it's always worked faithfully for me so there's some chance that the metal has fused. Given that I've damaged several synths with my mucking around and that > I'm dealing with high voltages, should I just add that Odyssey to my pile of repairs for a professional to fix? >  Thanks, >       Paul T > > ________________________________ > Recent Activity: * New Members 4 > Visit Your Group > > Switch to: Text-Only, Daily Digest ⢠Unsubscribe ⢠Terms of Use > . >
2012-06-06 by The Wizard
You're right -- that fuse IS soldered to the PS board, and those "caps" on the ends are part of the fuse. So first off you'll need a fuse of that type to solder back in there after you remove the bad fuse. What you might want to consider doing, though (if you're in for a bit of fun) is go buy a fuse holder that mounts on a flat surface (Radio Shack probably has them, but NOT the type of fuse holder that installs though a panel) and then drill a couple mounting holes through the PS board (there's lots of room where there's no foils), mount the holder with a couple screws, lockwashers and nuts, and then run a couple wires from the fuse holder to where the fuse was installed on the board. Now you can easily replace the fuses in the future without getting out the ol' soldering iron. This would be good, because I can't see any reason why that fuse would blow on account of a power cord issue. (I can send you a scan of the schematic, if you like.) You've got some other issue going on there, and may blow a few more fuses as you track it down (should you choose to do so). If you're not too keen on it, though, please DO leave it to the service techs, as you wouldn't want to cause a minor problem to become a major one. ---Kevin --- In vintagesynthrepair@yahoogroups.com, Paul Krull <paul.krull@...> wrote:
> >  I spent my weekend digging through some synths that have not been used in a while and came up with lots of troubles on various synths. About the only repair I am capable of taking on myself is my very first synth: an ARP Odyssey with the 4035 filter which blew a fuse when I was handling it plugged in and turned on with a brittle and failing power cord. I can replace the cord and maybe even the fuse, except that I can't quite figure out what the deal is with the fuse holder or if there's a fuse holder at all. It looks like each end of the fuse is inserted into a metal cup that's soldered into the power supply board but there's no moving or dislodging the fuse from the holder. I might add that this Odyssey has been through an apartment fire 30 years ago so the insides are less than pristine though it's always worked faithfully for me so there's some chance that the metal has fused. Given that I've damaged several synths with my mucking around and that > I'm dealing with high voltages, should I just add that Odyssey to my pile of repairs for a professional to fix? >  Thanks, >       Paul T > > ________________________________ > Recent Activity: * New Members 4 > Visit Your Group > > Switch to: Text-Only, Daily Digest ⢠Unsubscribe ⢠Terms of Use > . >