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jnmeade
Joined: 27 Sep 2012
Posts: 12
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 Posted: Tue Jun 28, 2016 1:15 pm Post subject: Bendix King KY97A Tuning Problem |
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My Bendix King KY97A VHF Transceiver inner tuner knob skips tuning
adjustments. It is like a gear with some worn or missing teeth. It tunes
properly for a while and then skips repeatedly for a while. The radio
works fine in all other regards.
Has anyone ever experienced this or looked inside to see if there is an
obvious issue? I may open the case when I get a chance.
TIA
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racerjerry
Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY
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| Posted: Thu Jun 30, 2016 6:49 am Post subject: Re: Bendix King KY97A Tuning Problem |
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I am sure you know this already BUT... Before you tear it apart, make sure the problem is not just a loose knob set screw
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jnmeade
Joined: 27 Sep 2012
Posts: 12
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| Posted: Fri Jul 01, 2016 3:27 am Post subject: Re: Bendix King KY97A Tuning Problem |
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I did check the knob and it is securely on the shaft, but thanks for the reminder. When one turns the knob, there is a distinctive aural and tactical click. Sometimes the display updates and sometimes it doesn't. The display always indicates the true frequency, so this may be a mechanical issue. I've moved the knob enough that I'm confident it is not a dirty wiper.
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racerjerry
Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY
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| Posted: Fri Jul 01, 2016 3:58 am Post subject: Re: Bendix King KY97A Tuning Problem |
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I searched for a KY97A Maintenance / Overhaul manual (not install manual) availability on the web that might help you out. I found this manual preview for KY 96/97 that enables you to view all pages (scroll down to view each page) and also has a magnifier to view detail. This requires some WORK, but the entire manual appears to be viewable along with parts list.
http://www.manualslib.com/manual/835245/Bendixking-Ky-96a.html?
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ceengland7(at)gmail.com
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| Posted: Fri Jul 01, 2016 5:26 am Post subject: Bendix King KY97A Tuning Problem |
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On Fri, Jul 1, 2016 at 6:27 AM, jnmeade <jnmeade(at)southslope.net (jnmeade(at)southslope.net)> wrote:
| Quote: | --> AeroElectric-List message posted by: "jnmeade" <jnmeade(at)southslope.net (jnmeade(at)southslope.net)>
I did check the knob and it is securely on the shaft, but thanks for the reminder. When one turns the knob, there is a distinctive aural and tactical click. Sometimes the display updates and sometimes it doesn't. The display always indicates the true frequency, so this may be a mechanical issue. I've moved the knob enough that I'm confident it is not a dirty wiper.
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As someone who was an electronics tech back in another life (in the epoch when that radio was probably designed), I can tell you that you might be over-confident.  Some corrosion issues on switch contacts or controls just cannot be wiped away by switch action. Or even contact cleaner, in some cases.
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