Bobby,
If you haven’t already, consider reversing the
chips on the board and then copying A (originally B) to B
(originally A). This might restore all programmable parameters
to the malfunctioning chip. I don’t know if that would be a
risk for corrupting the good chip but that seems unlikely. I’ve
done this to enable reading parameters from the originally B
chip.
Steve Boese
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Thanks
Finn. We will explore this as a possible solution.
Also the duplication service.
Another
question. How to tell if the controller is truly
corrupt? When Dennis started the engine in Mode 4 he
hit the store button 2-3 times for priming. I’m
wondering if Mode 4 has another function when the
engine is not running?
Bobby
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Monday, July 12, 2021 9:31 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: QNF Chip
Programmer
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
<image001.png>
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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