K5synth

You wrote: "As I see, 120v is kind of rare(I've been told these things
output 120, not 100)"

The best I can tell the inverter voltage output is related to, among
other things, the surface area of the backlight.  The new backlight I
put in has a surface area that is noticeably larger than the old back-
light.  This might be part of the reason I am only getting about 108V.
     The K5 spec may be 120V as you were told, but my backlight is no
longer stock and my inverter is old!  :)


--- In k5synth@yahoogroups.com, Antoine Deschênes <antdes45@n...> wrote:
> You're getting a 100v inverter. .
> 
> antdes45@n... a écrit:
> 
> > The
> > higher the voltage and freq the brighter the backlight.
> >
> > ERG power has good inverters/choice, but the problem is to find a 
> > place to buy them(My local shop is the only one I know selling these 
> > inverter, but they sell them only in 12v. Inverters are like 
> > backlights, the more they have been used, the more they loose 
> > power(Yours lost 18!). Actually what is good with ERGs is that they 
> > apply more voltage over use so brightness stays there longer. My 
> > inverter is :( intermittent, first off, after PSU gets hot, starts. 
> > SOmetimes just don't start, sometimes works OK. The problem is cold 
> > solder joints in an epoxy and plastic case :(. My 12v one is shorter, 
> > so it doesn't fit in the 120v hole(Even if it takes 5v but is less 
> > bright). If some holes don't fit, drill some holes(not on prints if 
> > really big) and put wires.
> >
> > nelsonj_sce@y... a écrit:
> >
> >> Update:
> >> Well today I ordered a new inverter from www.DigiKey.com.  I found an
> >> inverter that looks like it will do the job - for those
interested it is:
> >>
> >> Digikey part #      289-1032-ND  and it only cost $11.90 - not bad.
> >>
> >> I am not sure if it will fit exactly in the same slots as the
original
> >> inverter so it might require some additional wiring.
> >>
> >> Anyway, I had my K5 open to look at the power supply to plan the new
> >> inverter install when my K5 started "humming", and guess what, I now
> >> have a beautiful blue backlight.  It looks great, a very cool blue.
> >> So it appears my inverter was not bad, but it just has bad solder
> >> joints.  It is working for now but tomorrow I will likely take
out the
> >> board and redo all the solder joints. 
> >>
> >> Just some additional info I learned in researching backlights and
> >> inverters.  The "brightness" of the backlight is a function of the
> >> voltage and frequency applied to the backlight.  It appears one has a
> >> lot of flexibility in selecting the inverter output voltage and freq.
> >> For example, nightlauch says you can "test" the backlight by plugging
> >> it directly in to a wall socket (120V AC @ 60 Hz here in the US)!
 The
> >> higher the voltage and freq the brighter the backlight.  
However, the
> >> backlight will "burn out" quicker the higher the freq.  So there is a
> >> trade off, high freq = bright but shorter life. 
> >>
> >> Right now my stock inverter is putting out about 102V @ 380 Hz.  I
> >> think the inverter I ordered will put out about 95V @ 540 Hz and
> >> should work with a 3 - 6 V DC input.
> >>
> >> Next step, 147k resistors (also ordered from Digikey today). 
> >>
> >>
> >>
> >> --- In k5synth@yahoogroups.com, "nelsonj_sce" <nelsonj_sce@y...>
wrote:
> >> > Well I replaced my backlight with one I ordered from
> >> www.nightlaunch.com.
> >> >
> >> > It took less than two weeks from when I ordered and the parts look
> >> good. 
> >> >
> >> > Good news/bad news though on my backlight. 
> >> >
> >> > The good news:  I had no problems removing the LCD, taking out
the old
> >> > backlight and sliding in the new backlight.  The new light has some
> >> > wires and a plastic "tab" that kind of gets in the way, so I
soldered
> >> > the backlight wires to where the wires connect to the LCD board.
> >> > Hint:You have to cut the new backlight to size, so make the
backlight
> >> > a little longer (say 1/4 inch) than the original to make things
easier.
> >> >
> >> > Bad news: My backlight does not work but I think my inverter is the
> >> > problem.  I am only getting about 1/2 Volt at the output of my
> >> > inverter, and I am supposed to get 120V @400Hz if I understand the
> >> > part correctly.  I tested my inverter before I did the backlight
> >> > install and saw it had low voltage, but I was hoping that my
existing
> >> > "dead" backlight was causing the problem (i.e. it was shorted.) I
> >> > guess not because even with the new backlight I get very low
voltage.
> >> >
> >> > Anyway, it looks like I need to get an inverter.  I can get an
> >> > inverter from nightlaunch for $17.99+s/h but it needs 9V DC.  I
> >> > understand the inverter in the K5 uses 5V DC.
> >> > 
> >> > Q1: Does the K5 inverter use 5V DC?
> >> > Q2: If I measure the voltage on the two wires to the left of the
> >> > inverter, should I get 120V if everything is working? (My Fluke
says
> >> > it is good <=1kHz)
> >> > Q2: Does anyone know where to get a compatible K5 inverter and how
> >> > much it will cost?
> >> >
> >> > Thanks again for all the help.  This group is great.
> >>
> >>
> >
> > -- 
> > antdes45@n...
> >
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