K5synth

Nichia box on mi-010 board near the plug on the top cover. Actually the 
highest voltage found in here is 24v, so caps are not a problem(And the 
only one with a big value works at less than 16v), they're dangerous in 
computer PSUs, power amps, TVs and other high voltage devices. The ones 
in the K5 can't do nothing to you(Or maybe a small 12v shock for 1/100 
sec but I'm not even sure 12vDC can give you a shock).


nelsonj_sce@... a \ufffdcrit:

> It is very easy to find the inverter but it is not next to the
> backlight.  It is a white box about 1.5"X.5"X1" in the right corner of
> the K5 (as you are playing).  It is actually on the lid and it is next
> to a bunch of blue capacitors. 
>
> BE VERY VERY VERY CAREFUL because capacitors can be VERY dangerous.
> (In some cases they can kill you!)
>
> Make sure you unplug the K5 before doing anything.
>
> You need to make sure the caps are discharged before you solder.  You
> will have to take off three wire harness and take off six screws.  The
> inverter has three solder points, and you need to resolder all three
> points. 
>
> AGAIN, you need to discharge the caps right after you take off the
> power supply board.  It helps to test the voltage on the caps relative
> to ground after you discharge them to make sure they are fully
> discharged.  Caps have a way of getting "recharged" by their
> neighbors. They should have 0V DC at both leads before you start doing
> any solder work.
>
> I hate to be so paranoid but if you are not comfortable discharging
> the caps DO NOT DO THIS REPAIR YOURSELF. It is just not worth getting
> hurt just to have a backlight... (I think these all these caps charge
> at a low voltage and should not be that dangerous, but without a
> schematic I am just not certain and it is much better to be safe than
> sorry on these things.)
>
> Anyway, I did the resolder about 3 hours ago and so far things work
> great.  I tried to remove as much of the old solder as I could, then I
> applied globs of new solder.  It is nice to use my K5 in low light!
>
> Good luck and be safe.
>
>
> --- In k5synth@yahoogroups.com, "Cindy and Nathan" <Cthane1@a...> wrote:
> > Good information.  My Nightlaunch backlight is still going strong on
> my other gear, and I suppose I should get one for my K5.  First I will
> try the re-solder thing since the Kawai tech support guy told me the
> same thing.  Can I find the inverter easily?  Is is connected directly
> to the backlight?  
> > Didobrain
> >   ----- Original Message -----
> >   From: nelsonj_sce
> >   To: k5synth@yahoogroups.com
> >   Sent: Tuesday, September 14, 2004 11:57 PM
> >   Subject: [k5synth] Re: New Backlight - inverter problems
> >
> >
> >   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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-- 

Antoine Desch\ufffdnes /aka
  -\ufffd\ufffd`-\ufffd-DragonMaster-\ufffd-\ufffd\ufffd`-
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