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stuart(at)stuarthutchison
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 Posted: Mon Jul 18, 2011 4:49 am Post subject: TXDR & Nav/Com light sensors |
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G'day Bob,
We have a KT76C transponder, a KX-165 and a KX155 radio in our Club Piper Archer - all with gas discharge displays.
At night they're all unreadable, but display just fine in daylight or if a torch is aimed at the light sensor (I assume an SPD like a camera light sensor).
Before we head out to potentially get ripped off buying new circuit boards or refurbished units etc, do you know if this is a common problem and should it be a relatively easy fix?
Cheers, Stu
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Mon Jul 18, 2011 3:15 pm Post subject: TXDR & Nav/Com light sensors |
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At 07:47 AM 7/18/2011, you wrote:
| Quote: | G'day Bob,
We have a KT76C transponder, a KX-165 and a KX155 radio in our Club Piper Archer - all with gas discharge displays.
At night they're all unreadable, but display just fine in daylight or if a torch is aimed at the light sensor (I assume an SPD like a camera light sensor).
Before we head out to potentially get ripped off buying new circuit boards or refurbished units etc, do you know if this is a common problem and should it be a relatively easy fix?
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I'm sorry, I've not had any experience or insight
from others as to how you might deal with this
issue. Suggest you post it to the list. Somebody
might have more knowledge than I.
Bob . . . [quote][b]
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racerjerry
Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY
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| Posted: Tue Jul 19, 2011 5:16 am Post subject: Re: TXDR & Nav/Com light sensors |
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I had the same symptoms with my KT-76A and KX-155. A flashlight shined directly on the photocell restored everything to normal brightness. After many years, the photocell material apparently oxidizes and disappears with age. If you have a smattering of electronics knowledge and experience with a soldering iron, the photocell (V301) on the KT-76A is not too difficult to replace as it is located off the main board on a separate switch board assy. behind the front panel. GOOGLE part no. 134-05005-0002. Mine cost me about $15 + shipping in 2006.
The same part number photocell is also used on the KX-155 and KX-165, but here the photocell is not quite so easy to get to for replacement. The expensive and delicate gas tube displays on the Nav/Com must be removed in order replace the photocell. This repair is best be left to the radio shop (don’t ask me how I know).
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Jerry King |
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