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

 
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nuckolls.bob(at)aeroelect
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PostPosted: Sun Jun 25, 2017 3:31 am    Post subject: Kx 170 b radio, ki211c indicator no power to ki 211c pin a Reply with 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. I pulled the cdi and the connector was loose, so fixed that. Probed for power. Pin c on ki 211 is supposed to be 13.75 v input, no power there w nav radio on. I do get gs energize power at pin p when tuned to gs freq.

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? Im kinda baffled.

Page 2-13 shows what i think I have.

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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