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Old 12-26-2008, 07:55 AM
avpro56 avpro56 is offline
Join Date: Jan 2005
Location: Northport, NY
Posts: 63
Default KN-53 repair

Does anybody have the KN-53 repair manual handy? I'm looking at replacing the LED display on this older but otherwise fine nav radio. It does not seem like a difficult task to replace the LED display and it certainly is within my capability for use in an experimental. I'm also looking for a source of the LED display and part number.
Jon Ross
RV-8 (sold)
ATP, A&P IA, EAA Technical Counselor & AB DAR
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Old 12-26-2008, 08:15 AM
fmarino1976 fmarino1976 is offline
Join Date: Jan 2007
Location: Tricities, TN
Posts: 166
Talking Display

Hi there,

I don't have a manual with me, but I can tell you that the KN53 does not use an LCD display. It is a gas-discharge display that only Bendix/King dealers can get from the manufacturer. Replacing them is not that complicated, although there are some very fragile contacts that support that display.

What is your display doing exactly? If the display is not completely dead, you could try to remove it from its mounting contacts, and clean the contacts with an pencil eraser. Also, the display is made by sandwiching 2 glass plates together. Over time, metal migrates between the contacts under the glass, sometimes cleaning the metal migrations would fix problems like erroneous segments partially turning on. This happens because the display operates at about 190VDC. If you do clean the display, or if you install a new one for that matter, make sure you spread some DOW 4 over the contacts to avoid the metal migration.

Good luck. Let me know if you have any questions, and I'll try to answer them the best I can. Disclaimer: Even though I have done this in an avionics shop, I can take no responsibility for someone else trying it at home! There, hopefully that will satisfy my lawyer.
A&P, IA, Avionics Tech, and finally: Pilot! (12/28/06)
Dying to build an RV10. Not quite ready yet
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Old 07-06-2010, 09:43 AM
bswat bswat is offline
Join Date: Jan 2005
Location: Acworth, GA (NW Atlanta metro)
Posts: 27
Default Link to KN-53 Install Manual

I realize that the need is long gone, but for the benefit of others that might also be looking for the King Kn-53 Install Manual, here is the link:

Bill Swatling
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Old 04-15-2014, 03:54 AM
przemekmac przemekmac is offline
Join Date: Jan 2014
Location: Koszalin
Posts: 2

Hi, I'm looking for pinout/installation manual for this radio. Can anybody share it for me?

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Old 12-20-2014, 09:41 AM
JanRV6UK's Avatar
JanRV6UK JanRV6UK is offline
Join Date: Jul 2009
Location: England
Posts: 470

I am also looking for a install manual ...

Slooow RV6, no hole, builder in UK
Paid up for 2015 ...
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