Thomas wrote:

> I enabled debug mode option already, but it still doesn't work.  When I
> press the "self Test" button, it returns "Incorrect MCLR pin supply voltage.
> Check ICD0x4".  What does that mean?
>
> I don't know if the DC/DC circuit output has to be 21Volts as it says on the
> schematic.  When I probe at the input of the 78L12 regulator and I get only
> 12.5V.  Is this the source of the problem?  Anything I can do?
>

Is this a homebrew project ? If so try replacing the switching transistor which
provides the -ve voltage with a different one. I found using an old ZTX650 gave
a much greater negative voltage than a BCxxx. If you are using old capacitors it
might be worth checking their ESR, good caps are important.

12.5v into the regulator is almost certainly not enough to power it (mine
produces ~20v) - check the datasheet if you are not sure.

I also had to choose the LED very carefully - its used as a voltage reference
(poor design ?) several would not work, I seem to remember 1.2v volt drop across
it is about right.

Hope this helps

Steve

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