Vintage Synth Repair

14.4 volts I would say wouldn't cause you much of a
problem anyway. It's ususally not critical. If it was
the the +5 we are talking about then it would be
different. It's common for psu voltages not to be
exact even from brand new. Do you actually have a
problem with the keyboard? 

If there is no problem with the keyboard I'd just put
it back together and leave it.

If there really is a problem with the synth then maybe
swap out the two transistors. If still a problem then
it's probably not the PSU but something in the synth
circuit that uses the +15-15 dragging the PSU down..




--- gil_we <gil_we@...> wrote:

> I've just refurbished my JX8P's power supply unit,
> replacing all caps. I check the voltages and see
> +14.40v and -14.40v instead of -15v and +15v.
> 
> The schematics shows a M5230L dual tracking
> regulator, two 
> transistors and an array of resistors.
> 
> So far I replaced the regulator to no avail,
> and verified the correct values of the various high
> precision 
> resisotrs in the circuit, which are found to be ol.
> 
> I'm trying to figure out what could be causing this
> problem,
> can anyone help ?....
> 
> Here's JX8P power supply schematics:
>
http://www.fileden.com/files/2006/10/13/285304/jx8p%20ps.JPG
> 
> ..and here's M5230L datasheet:
>
http://www.ortodoxism.ro/datasheets/MitsubishiElectricCorporation/mXqy
> yxt.pdf
> 
> Thanks in advance !
> 
> 
> 



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