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Thread Tools | Display Modes |
#1
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A real head-scratcher
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. 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.... -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
#2
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A real head-scratcher
In article . com,
Jay Honeck wrote: Any theories here? I was hoping it would cure itself (ha!), but it was the same on our flight today.... loose internal connection? -- Bob Noel (goodness, please trim replies!!!) |
#3
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A real head-scratcher
Jay Honeck wrote:
Any theories here? I was hoping it would cure itself (ha!), but it was the same on our flight today.... -- Could be moisture... it does interesting things to little electronic circuits. The display on my Kx155 can do the same thuing for 30 seconds or so when I first turn it on when in very humid weather. |
#4
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A real head-scratcher
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. What's the bus voltage like? The first sign of a low voltage situation on several planes I flew was that the KX155 displays started losing segments. |
#5
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A real head-scratcher
Jay Honeck wrote:
Any theories here? Loose connection or cold solder joint. |
#6
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A real head-scratcher
That was my first impression. It's been pretty humid around here.
Jim "kontiki" wrote in message ... Jay Honeck wrote: Any theories here? I was hoping it would cure itself (ha!), but it was the same on our flight today.... -- Could be moisture... it does interesting things to little electronic circuits. The display on my Kx155 can do the same thuing for 30 seconds or so when I first turn it on when in very humid weather. |
#7
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A real head-scratcher
What's the bus voltage like? The first sign of a low voltage
situation on several planes I flew was that the KX155 displays started losing segments. Hmmm. I didn't notice anything amiss, but I can't tell you exactly (despite having not one, but TWO digital volt/amp meters in the panel). I'll check that next time we fly. -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
#8
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A real head-scratcher
Jay Honeck wrote:
[JPI EDM-700 engine analyzer missing seven-segment display segments] 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! Disclaimer: This is based on experience with ground vehicles and equipment. I don't have an A&P; I don't even have a TG&Y. Your mileage may vary. I'm going to add my vote for a bad connection or cold solder joint internal to the analyzer. The time-honored diagnostic is to thwack it with your finger and see if the display changes. If you're feeling adventurous, temperature-cycle it to see if the display changes. Like: go to the hangar at 6 AM after the plane has been sitting all night, turn on the master, and check the display. Then, put your calibrated fingertip next to the display, and very carefully direct a hair dryer (on low) at the display to see if it changes. If your finger gets too hot for comfort, shut off the hair dryer. It's not _impossible_ for the internal programming to change on its own, but it's highly _improbable_. Disclaimer: This is based on experience with ground vehicles and equipment. I don't have an A&P; I don't even have a TG&Y. Your mileage may vary. Matt Roberds |
#9
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A real head-scratcher
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. -- Dan T-182T at BFM |
#10
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A real head-scratcher
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" |
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