K5synth

You're getting a 100v inverter. As I see, 120v is kind of rare(I've been 
told these things output 120, not 100).

antdes45@... 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@... 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.
>>
>>
>
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> antdes45@netscape.net
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antdes45@...