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Kx 170 b radio, ki211c indicator no power to ki 211c pin a

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dave(at)evergreengeo.com
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Posted: Sun Jun 25, 2017 8:17 am Post subject: Kx 170 b radio, ki211c indicator no power to ki 211c pin a

Thanks Bob, that is where I was heading.  But it seems odd that the wire pins to tray buzz on the ohmeter.  Must be doing something wrong.   



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On Sun, Jun 25, 2017 at 7:30 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

 	  Quote: 	
		    At 04:56 PM 6/24/2017, you wrote:



  	  Quote: 	
		    Hi guys, been away from flying a while, and airplane mode and N77FE is a bit pissed off at beong ignored.



  Cant get my cdi to power up.



  I tried both my kx 170b and michel mx 170 in the tray. Â  Â I pulled the cdi and the connector was loose, so fixed that.Â  Probed for power. Â  Pin c on ki 211 is supposed to be 13.75 v input, no power there w nav radio on. Â  I do get gs energize power at pin p when tuned to gs freq. Â Â 



  Â Pin 26 is power out from tray, probed from there to connector end of cdi connector pin c and wire is connected. Continuity is solid.



  Does the tray connector jumper power to the cdi, or does the radio switch it?Â  Im kinda baffled. Â 



  Page 2-13 shows what i think I have. Â 



  Thanks, Dave Leonard Super viking N77FE



    https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.aeroelectric.com/Installation_Data/Bendix-King/KX175B_IM.pdf&ved=0ahUKEwiSucHOuNfUAhWp64MKHfcCBQ0QFggdMAA&usg=AFQjCNEMWUD78gQVdc-xgRjp70uLbwJ1bA 

 	
 

   The label "NAV SWITCHED 13.75VDC" says that this is

   indeed a power output pin controlled by the nav receiver's

   power switch. There is a Note 7 associated with this

   path:



 

 [img]cid:7.1.0.9.0.20170625062152.06064d30(at)aeroelectric.com.0[/img] 

   . . . which tells us that this ouput is limited

   to 300 ma.

  

   Probing this pathway with the voltmeter should show

   bus voltage with the nav radio ON.  This power

   comes from the radio and is switched internally

   to the radio. If the power is missing on TWO

   radios, then it seems likely that the disconnect

   is somewhere in the ship's wiring.



 

 

   Bob . . .

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