flyrotary@lancaironline.net Mailing List Archive

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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