check the smoothing capacitor c28 the
transformer is fixed uptransforms to the correct voltage for input
so if the input ac voltage is wrong then it gets
multiplied by the transformer
so the input voltage to the transformer has to be
wrong
the transistor switches the dc voltage of 5v into a
small ac voltage
its the same with all efoil invertors except on the
korgs they have the components on board a lot use inverter chips which are
the same but in a white box this is so if the invertor fails you can just swap
it out
on the korgs you have to find which parts are at
fualt and change them
i would just remove the invertor circuit and fit an
led lcd instead
then all you have todo is put a current limiting
resistor to the manufacturers specs for the led back light from 5v line to the +
of the efiol output pin on the psu
then you can use the same cable for the back light
as the original efiol cable
the led backlights from rs work just fitted one to
a kurzweil k2000
which uses the same footprint as the wavestation
but the negative blue ones are on back order until november
----- Original Message -----From: scott fryeSent: Sunday, August 05, 2012 2:49 PMSubject: [vintagesynthrepair] Re: Backlight Revisited...Is the rep rate of the AC frequency set internally on the transformer
module?....If not, there must be an external timing component that's
making the thing run too fast.
A resonator?....A timing capacitor?
--
Scott Frye
Audio-fixation.net
Vermont