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From: Dale Rogers <dale.r@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: EC2 problems - solved
Date: Sat, 4 Jun 2005 23:21:48 -0400
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FWIW, if you think you have such a problem, finding someone 
with a Time Domain Reflectometer (TDR) can save a lot of troubleshooting time.  Check an open-circuit wire from each 
end.  If the reading is different, you have a bad wire.  The 
time signature can even tell you how far down the wire the 
break (or even partial break) is.

Dale R.

> From: Bob White <bob@bob-white.com>
> Date: 2005/06/04 Sat PM 07:27:31 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: EC2 problems - solved
> 
> Congratulations John,
> 
> What a relief it must be to actually have an answer.  A broken wire
> under the insulation is sometimes one of the hardest problems to find.
> It could have been worse.  It could have worked till heat or vibration
> made it quit in flight.
> 
> Bob W.
> 
> On Sat, 4 Jun 2005 15:40:43 -0400
> "John Slade" <sladerj@bellsouth.net> wrote:
> 
>> Tracy and others.
>> Following more than 12 months of battling with EC2 issues I'm pretty sure
>> it's Eureka day!
>> After rewiring and testing for almost 4 weeks I plugged the EC2 in last
>> night, and got exactly the same symptoms as before. NOP flashing indicating
>> no communication. I took the EC2 to Buly's plane and tried it in his
>> installation. Same NOP, so I was thinking I'd fried it again. Before sending
>> it back yet again I decided to install it my plane one more time and see if
>> there was a spark.
>> 
>> To my amazement it worked. No NOP, and I could bring up the EC2 data. The
>> only thing that changed overnight was that I moved the cable to unplug it. I
>> climbed in the back and found that I could make the NOP flash, or stop
>> flashing, by moving the cable. I haven't taken the connector apart yet, but
>> I'm expecting to find a broken wire inside the insulation, probably near a
>> solder joint at the pin. Whenever I bent the connector outward for testing
>> it made contact. When I bent it back to plug it in, contact was lost.
>> 
>> Bingo!
>> John
>> 
>> Just guessing, but maybe the new EC2 can't communicate with a pre-autotune
>> EM2 like Buly's. ???