I tried to reply again earlier, but apparently it didn't get through:

I didn't want to leave this thread hanging. The problem has been corrected.=
=20
It turned out that the pogo pin for DAT had a bit of a solder bump that=20
poked through the insulator and shorted to the GND pin. Once I tracked that=
=20
down, everything worked great!

Thanks, Olin, for all the help. I have a much better appreciation for all=
=20
the work that went into the design and testing of the EasyProg, and can=20
definitely recommend it to anyone that is interested.

Thanks again!

--Joe Jansen

On 9/9/05, Olin Lathrop <olin_piclist@embedinc.com> wrote:
>=20
> Joe Jansen wrote:
> > all of my tests were done with the lines floating. I did not have my
> > circuit connected, as I figured that it may introduce variables like
> > that. DATH and DATL were what I was using to attempt to drive it.
> >
> > I will try finding an 18 pin DIP and see if that works. That should
> > tell me what part of the circuit the problem is at.
>=20
> If DATH and DATL don't make the PGD line change accordingly with nothing
> connected to the programmer, then there is definitely something broken.
>=20
> Fortunately this should be easy to find. From the schematic you can see
> that PGD is driven by pin 2 of the 16F648A controller via the 2K ohm
> resistor R25. First check to make sure pin 2 responds to DATH and DATL
> commands. If so, then either R25 is open or the wrong value, or the other
> end is shorted to ground. If pin 2 doesn't respond to DATH/DATL, then it'=
s
> probably shorted to ground. In that case try lifting R25 and inspecting=
=20
> the
> trace carefully. You can also remove the PIC and test resistance from pin=
=20
> 2
> to ground. It could also be a bad 16F648A, but that's not very likely.
>=20
> Also remember to install the jumper J1 when using TEST_PICPRG. If you
> don't, the unit will reset to all lines off 5 seconds after receiving the
> last command.
>=20
>=20
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