I think I paid less than $20 for my
PICKKIT3 (clone, I guess).
You may get away with programming it in-circuit (you'll have to
power the EC2 board) if the board has the 5 or 6 header pins.
I put an PLCC68 socket on a piece of prototyping PCB with 6 pins
for the PICKIT3 connector.
All ground and supply pins have to be connected.
Search for and download PIC18F6680ProgrammingSpecs.pdf
Finn
On 7/11/2021 10:15 PM, Bobby Hughes
BHughes@qnsinc.net wrote:
Finn / Tracy
We think Dennis H. has a corrupt A
controller chip. He inadvertently started the engine in Mode 4
and things went bad. The B controller is running normally so
we have a good chip to work with. This is one of the early
big box EC2’s. Dennis and I worked a few hours trying
to tune the A controller. We reset Modes 1,3,4,6,8.multiple
times. Mode 2 is to copy A to B and I don’t think Mode 5 and
7 are used according to the book. There may be an issues with
the Programming Head. Sometimes we did managed to keep the
engine running with the manual mixture control. We noticed
changes to the engine while cycling through the program modes.
On one attempt we managed to get Mode 3 adjusted at 19” MP. We
were then able to make adjustments in Mode 1 up until about
24” MP and the engine just stopped. We restarted the engine
and we could not keep it running or make any Mode 1 adjustment
that helped. .
We pulled the EC2 and Program Head for
inspection. The Mode switch is a little sticky so we will use
mine to on the next attempt. So any advice were to get a
reasonable priced compatible 64-pin QFN programmer? Dennis’s
grandson will be the one copying the chip and said Microchip’s
programmer was about $400. We are looking for chips and may
have located some at Microchip direct.
PN: PIC 18F6680 –I/L
https://www.microchipdirect.com/product/PIC18LF6680-I/L?dfw_tracker=64197-PIC18LF6680-I%2FL&gclid=EAIaIQobChMIpe6Ny7fc8QIViwytBh0JDwLZEAQYASABEgJrufD_BwE
Thanks,
Bobby
J Hughes
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