KX-155 LEDs

John Purner wrote:
: I have the same problem with one of my KX155's and my ADF. Funny thing is
: that about five minutes after takeoff. The problem clears up. It seems like
: low voltage, but it isn't.

As I said it my post, I'm pretty sure that it's a pseudo-grounding
of the high-voltage that runs the displays. They're not LED's, and they
require a fairly high voltage, which is easier to bleed off due to
humidity. It's definately high enough to make you notice if you
accidentally brush up against it!

-Cory


--
************************************************** ***********************
* The prime directive of Linux: *
* - learn what you don't know, *
* - teach what you do. *
* (Just my 20 USm$) *
************************************************** ***********************

wrote:
: John Purner wrote:
: : I have the same problem with one of my KX155's and my ADF. Funny thing is
: : that about five minutes after takeoff. The problem clears up. It seems like
: : low voltage, but it isn't.

: As I said it my post, I'm pretty sure that it's a pseudo-grounding
: of the high-voltage that runs the displays. They're not LED's, and they
: require a fairly high voltage, which is easier to bleed off due to
: humidity. It's definately high enough to make you notice if you
: accidentally brush up against it!

: -Cory

John, Cory, try this:
Take the displays out. Burnish the silver contacts on the displays.
I used a pencil eraser. Note that the contacts are not gold, if they
were they would not tarnish. Put a bead of dielectric grease on the
display's contacts. This will create a gas-tight contact, and keep
the condensation from bleeding off the +150V used to light the
displays. Put the displays back in.

This is what Conrad up at the Radio Shop at KORH did to my KX155's
when I was having similar difficulties a few years ago. No further
problems.

--
Aaron Coolidge (N9376J)

Aaron,

I hate to press to much but I really need the help. How exactly do you
remove the displays?

Thanks very, very much

--
John Purner
Editor - The $100 Hamburger
http://www.100dollarhamburger.com
"Aaron Coolidge" wrote in message
...
wrote:
: John Purner wrote:
: : I have the same problem with one of my KX155's and my ADF. Funny thing
is
: : that about five minutes after takeoff. The problem clears up. It seems
like
: : low voltage, but it isn't.

: As I said it my post, I'm pretty sure that it's a pseudo-grounding
: of the high-voltage that runs the displays. They're not LED's, and they
: require a fairly high voltage, which is easier to bleed off due to
: humidity. It's definately high enough to make you notice if you
: accidentally brush up against it!

: -Cory

John, Cory, try this:
Take the displays out. Burnish the silver contacts on the displays.
I used a pencil eraser. Note that the contacts are not gold, if they
were they would not tarnish. Put a bead of dielectric grease on the
display's contacts. This will create a gas-tight contact, and keep
the condensation from bleeding off the +150V used to light the
displays. Put the displays back in.

This is what Conrad up at the Radio Shop at KORH did to my KX155's
when I was having similar difficulties a few years ago. No further
problems.

--
Aaron Coolidge (N9376J)

Aaron Coolidge wrote:

: John, Cory, try this:
: Take the displays out. Burnish the silver contacts on the displays.
: I used a pencil eraser. Note that the contacts are not gold, if they
: were they would not tarnish. Put a bead of dielectric grease on the
: display's contacts. This will create a gas-tight contact, and keep
: the condensation from bleeding off the +150V used to light the
: displays. Put the displays back in.

I'll give that a try. I wasn't really excited about taking it
apart too much, since it works fine 95% of the time. Of course the 5% of
the time it doesn't work is before it dries out on a nice, humid, damp IFR
day when having a 2nd nav shortly after takeoff would be nice...


-Cory



--
************************************************** ***********************
* The prime directive of Linux: *
* - learn what you don't know, *
* - teach what you do. *
* (Just my 20 USm$) *
************************************************** ***********************

"Aaron Coolidge" wrote in message ...

Take the displays out. Burnish the silver contacts on the displays.
I used a pencil eraser. Note that the contacts are not gold, if they

They probably are not silver. Silver is too soft and tarnishes worse
than these do. They're probably some alloy of tin.

Related perhaps: My display is to dim to read at night. If I sine a
flashlight at the sensor (left side) the display brightens up. Any
suggestions?

--

Thx in Advance, {|;-)

Victor J. (Jim) Osborne, Jr.



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