|
|
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. ???
|
|