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Radioflyer
Joined: 04 Feb 2009
Posts: 43
Location: Boston
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 Posted: Thu Aug 21, 2014 8:10 am Post subject: KX165 transmit light stuck |
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I've been troubleshooting my intercom system and radio operation and eventually found one of the mic jacks had tangs that were bent and touching. After unbending the tangs, the intercom system worked, but the radio seems to be stuck on transmit. I pulled the radio out of the plane, isolated from all associated devices, powered it up and the "T" light is constantly on.
So, it's a radio problem. The radio is actually putting out a weak signal, but no voice. However, if I activate the PTT switch, it will transmit clearly. Nevertheless, can't receive because the T stays on. Could the shorted mic input have caused this fault? Can anyone give some advise on how to remedy, besides going straight to the avionics shop?
--Jose
Ps-I've pulled the manuals Bob N. No clues, yet.
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nuckolls.bob(at)aeroelect
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| Posted: Thu Aug 21, 2014 10:09 am Post subject: KX165 transmit light stuck |
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At 11:10 AM 8/21/2014, you wrote:
--> AeroElectric-List message posted by: "Radioflyer" <skyeyecorp(at)airpost.net>
I've been troubleshooting my intercom system and radio operation and eventually found one of the mic jacks had tangs that were bent and touching. After unbending the tangs, the intercom system worked, but the radio seems to be stuck on transmit. I pulled the radio out of the plane, isolated from all associated devices, powered it up and the "T" light is constantly on.
So, it's a radio problem. The radio is actually putting out a weak signal, but no voice. However, if I activate the PTT switch, it will transmit clearly. Nevertheless, can't receive because the T stays on. Could the shorted mic input have caused this fault? Can anyone give some advise on how to remedy, besides going straight to the avionics shop?
--Jose
Ps-I've pulled the manuals Bob N. No clues, yet.
Doesn't sound good. In the service manual, Figure 6-8
sheet 5 of 11 we find this excerpt of the PTT input
circuit . . .
[img]cid:.0[/img]
It seems likely that your difficulty lies in or somewhere close
to either side of this bit of circuitry.
Bob . . .
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Radioflyer
Joined: 04 Feb 2009
Posts: 43
Location: Boston
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| Posted: Thu Aug 21, 2014 2:26 pm Post subject: Re: KX165 transmit light stuck |
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Hmmm. I was about to look more deeply into the circuitry when frustration truly hit (the radio). Hit it with a bigger hammer, as they say. Well thinking there might be a relay somewhere in the unit, I gave it a sharp tap and the the T went away! Now, I can receive. The T does come back on only when the mic is keyed, as it should. Have to still test for actual voice transmission, but so far all looks good. Funny, though that the mic key circuit has no relays, though.
--Jose
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nuckolls.bob(at)aeroelect
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| Posted: Thu Aug 21, 2014 6:53 pm Post subject: KX165 transmit light stuck |
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At 05:26 PM 8/21/2014, you wrote:
| Quote: |
Hmmm. I was about to look more deeply into the circuitry when
frustration truly hit (the radio). Hit it with a bigger hammer, as
they say. Well thinking there might be a relay somewhere in the
unit, I gave it a sharp tap and the the T went away! Now, I can
receive. The T does come back on only when the mic is keyed, as it
should. Have to still test for actual voice transmission, but so far
all looks good. Funny, though that the mic key circuit has no relays, though.
--Jose
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Yup, that went all solid state a few years back.
It's a whole new ball game . . .
Bob . . .
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