Narco Mk 12D display?

On Tue, 2 Jan 2007 14:12:34 +1100, "Ron"
wrote:

I had the display replaced a couple of years ago after a couple of segments
"burnt out". Had to be shipped to Australia with special packaging, due to
the minute radioactive material in the display. Cost about $800 AU.

I now hold my finger of the LCD so the display does not flash brightly when
the unit is turned on.

regards
Ron


Can you clarify what you mean re. finger. we have just replaced a
display in one of our sets!

In the past the Tx audio failed on 2xCOM and needed a zener diode
replacing. The IDME has had an intermittent DME reading from new on
low frequencies (used by ILS).

Such a shame they are unreliable as they are easy to use and offer
some nice frills.

David

My apologises, I cover the LDR (The intensity control) with my finger to
reduce the initial intensity of the display on power on.

Otherwise a nice set. However it resets the standby frequency to 121.9 MHz
on power on.
--

regards
Ron


wrote in message
...
On Tue, 2 Jan 2007 14:12:34 +1100, "Ron"
wrote:

I had the display replaced a couple of years ago after a couple of
segments
"burnt out". Had to be shipped to Australia with special packaging, due to
the minute radioactive material in the display. Cost about $800 AU.

I now hold my finger of the LCD so the display does not flash brightly
when
the unit is turned on.

regards
Ron


Can you clarify what you mean re. finger. we have just replaced a
display in one of our sets!

In the past the Tx audio failed on 2xCOM and needed a zener diode
replacing. The IDME has had an intermittent DME reading from new on
low frequencies (used by ILS).

Such a shame they are unreliable as they are easy to use and offer
some nice frills.

David

On Thu, 4 Jan 2007 11:00:00 +1100, "Ron"
wrote:

My apologises, I cover the LDR (The intensity control) with my finger to
reduce the initial intensity of the display on power on.

Otherwise a nice set. However it resets the standby frequency to 121.9 MHz
on power on.

Thanks, I wondered if that's what you meant.
I discovered that covering the LDR during the day caused the display
to vanish completely when we had a fault:-(
Fortunately for my night flight I still had COM2.

Have you checked the Operating Manual? The standby frequency is
supposed to reset to 121.9 when you switch Off then On. You can then
count the MHz and KHz by counting the detents as you rotate the
control. If you don't loose count then you can set any frequency (NAV
or COM) with a loss of display display. The NAV standby frequency
resets to 110.50 when powered Off then On.

David

Ron wrote:
My apologises, I cover the LDR (The intensity control) with my finger to
reduce the initial intensity of the display on power on.

Otherwise a nice set. However it resets the standby frequency to 121.9 MHz
on power on.
I have two MK12Ds and they do the same thing. I believe that is normal.
Check the Narco website. I had to do the same thing on the LED when it
was cold. I have sent both units to NARCO for R&R and very please.

--

Regards, Ross
C-172F 180HP
KSWI

On Thu, 04 Jan 2007 11:12:09 -0600, Ross wrote:

Ron wrote:
My apologises, I cover the LDR (The intensity control) with my finger to
reduce the initial intensity of the display on power on.

Otherwise a nice set. However it resets the standby frequency to 121.9 MHz
on power on.
I have two MK12Ds and they do the same thing. I believe that is normal.
Check the Narco website. I had to do the same thing on the LED when it
was cold. I have sent both units to NARCO for R&R and very please.

Go to: http://www.narco-avionics.com/
See also under MK12D/Retro handbook which makes this clearer.

david

Thanks David,

I see from the manual the 'keep alive' pin is no longer used in later
models.
Does anyone know how to 'keep' the standby freq 'alive' ie not reset to
121.9.

I guess the power-on spike to the display is controlled thru the LDR
circuitry.
regards
Ron


wrote in message
...
On Thu, 04 Jan 2007 11:12:09 -0600, Ross wrote:

Ron wrote:
My apologises, I cover the LDR (The intensity control) with my finger to
reduce the initial intensity of the display on power on.

Otherwise a nice set. However it resets the standby frequency to 121.9
MHz
on power on.
I have two MK12Ds and they do the same thing. I believe that is normal.
Check the Narco website. I had to do the same thing on the LED when it
was cold. I have sent both units to NARCO for R&R and very please.

Go to: http://www.narco-avionics.com/
See also under MK12D/Retro handbook which makes this clearer.

david