K2 Aux Bus - DC Bias at 9pin Connector ?

[Curt Milton]

I am still troubleshooting my KAT100, and now I am
wondering if the problem might be the aux bus.  

When the 9-pin connector is attached to the K2, and
the KAT100 is disconnected - should there be 5-6 volts
DC on pin 6 ?  I see voltages on pin 8 and 9, but
nothing on pin 6.  (And yes i verified the cable is ok
on pin 6).  

I had previously checked the DC path from pin 6 back
to the IOC in the K2 - but I hadn't probed this any
further.  

I suspect there are no other users of the Aux Bus
except an ATU (my K2 has only ssb, 160m and kpa100
installed).  

Info appreciated.  


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[Don Wilhelm-4]

Curt,

All options use the Auxbus - your KSB2, the KPA100 and even the KIOC
chip inside the K2 use th eAUXBUS.  If the K2 is working normally when
the KAT100 is attached, then the AUXBUS signal is working.

What is the problem with the KAT100?  If it is not recognized in the K2
menu, then the KAT100 firmware chip is not communicating with the K2
(yes, it uses the AUXBUS for that).  Be certain all pins of the KAT100
firmware chip socket are soldered (did you miss soldering pin 1? - that
often happens).  Connect the cable to the KAT100 (turn power off) and
check continuity from KAT100 U1 pin 40 to K2 Control Board P4 pin 2 -
somewhere near 470 ohms is expected.

If all the above is correct, the KAT100 firmware should be communicating
with the K2.

73,
Don W3FPR


Curt Milton wrote:

> I am still troubleshooting my KAT100, and now I am
> wondering if the problem might be the aux bus.  
>
> When the 9-pin connector is attached to the K2, and
> the KAT100 is disconnected - should there be 5-6 volts
> DC on pin 6 ?  I see voltages on pin 8 and 9, but
> nothing on pin 6.  (And yes i verified the cable is ok
> on pin 6).  
>
> I had previously checked the DC path from pin 6 back
> to the IOC in the K2 - but I hadn't probed this any
> further.  
>
> I suspect there are no other users of the Aux Bus
> except an ATU (my K2 has only ssb, 160m and kpa100
> installed).  
>
> Info appreciated.  
>
>
>       ____________________________________________________________________________________
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>  

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[Curt Milton]

Don

Thanks - that was the hint i needed to sort out the
maze of connectors.  

Yes it was open from KAT100 U1 pin 40 to K2 Control
Board P4 pin 2.  So i opened the K2 and laid
everything flat -- each board was ok.  I powered up
and it came to life.  I suspect the ribbon cable
between the K2 control board and KPA100 was pinched.
I carefully put it together and all is well now.  

Thanks again for your help, and verifying voltage on
your own K2.  

73, Curt K2 #2117

--- Don Wilhelm <[hidden email]> wrote:

> Curt,
>
> All options use the Auxbus - your KSB2, the KPA100
> and even the KIOC
> chip inside the K2 use th eAUXBUS.  If the K2 is
> working normally when
> the KAT100 is attached, then the AUXBUS signal is
> working.
>
> What is the problem with the KAT100?  If it is not
> recognized in the K2
> menu, then the KAT100 firmware chip is not
> communicating with the K2
> (yes, it uses the AUXBUS for that).  Be certain all
> pins of the KAT100
> firmware chip socket are soldered (did you miss
> soldering pin 1? - that
> often happens).  Connect the cable to the KAT100
> (turn power off) and
> check continuity from KAT100 U1 pin 40 to K2 Control
> Board P4 pin 2 -
> somewhere near 470 ohms is expected.
>
> If all the above is correct, the KAT100 firmware
> should be communicating
> with the K2.
>
> 73,
> Don W3FPR
>
>
> Curt Milton wrote:
> > I am still troubleshooting my KAT100, and now I am
> > wondering if the problem might be the aux bus.  
> >
> > When the 9-pin connector is attached to the K2,
> and
> > the KAT100 is disconnected - should there be 5-6
> volts
> > DC on pin 6 ?  I see voltages on pin 8 and 9, but
> > nothing on pin 6.  (And yes i verified the cable
> is ok
> > on pin 6).  
> >
> > I had previously checked the DC path from pin 6
> back
> > to the IOC in the K2 - but I hadn't probed this
> any
> > further.  
> >
> > I suspect there are no other users of the Aux Bus
> > except an ATU (my K2 has only ssb, 160m and kpa100
> > installed).  
> >
> > Info appreciated.  
> >
> >
> >      
>

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>
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>  
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> >
> >
> >  
>

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