A real head-scratcher

At least, then you'll get the latest software................which is a big
improvement i've been told



KG


"Jay Honeck" wrote in message
ups.com...
The time-honored diagnostic is to thwack it with your finger and see
if the display changes.

If that fails, try time-honored diagnostic #2: unplug the unit and plug
it
back in to reseat the connectors.

Well, I've tried whacking it (of course!), to no avail.

Luckily, my next planned upgrade was to install the outside air
temperature probe for the EDM-700, which will mean pulling the unit
out of the panel anyway. It's a real SOB to get at, so I suppose I
should be thankful that it chose now to go screwy...

Once it's out, we can play with it a bit more. I'm betting that I
have to send the danged thing back to JPI...
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

On Mon, 03 Sep 2007 20:14:02 -0700, Jay Honeck
wrote:

So we hop in the plane yesterday for the 50 minute flight to
Janesville, WI, and I notice that the display on our JPI EDM-700
engine analyzer looks funny.

Some of the LED numbers are missing pieces. Most are not. All the
vertical graph/bars appear to be fine.

I've seen this in many solid state displays that used the conductive
rubber strip between the display and the circuit board. I don't know
if yours is hard wired or used this route. Anything that breaks that
connection and lets in moisture or dirt can be a real headache.


Now for the odd part: The missing segments of the LEDs are NOT
consistent. For example, the same section of LEDs might improperly
display an "8" with a couple of missing segments on the right side of
the 8 -- but the next second it will change to a "9" and those right-
side segments will appear normally!

It's almost like the internal programming for the display of numerals
is screwed up, rather than the display itself?

Any theories here? I was hoping it would cure itself (ha!), but it
was the same on our flight today....

Then again I had something like this in an old KY197 and it took a new
display to fix it. Too bad it wasn't the display some one tried to
clean with a harsh solvent.

I had a similar problem. I think JPI charged me a couple hundred for
it and that included updated software.

-Robert

On Sep 4, 1:23 pm, "Dan Luke" wrote:
wrote:

The time-honored diagnostic is to thwack it with your finger and see
if the display changes.

If that fails, try time-honored diagnostic #2: unplug the unit and plug it
back in to reseat the connectors.

The EDM is a single unit, the display and internals are one piece so
there really isn't anything to unplug and replug in other than the
actual probes, which doesn't appear to be related to the problem.

-Robert