K1 Filter Board Resistance Checks

[Joseph M. Durnal]

I have completed soldering the components for the K1 2 band filter
board, but when I performed the resistance checks, there was a
problem.

XX - U1 pin 6, U1 pin 7 230-270 ohms --- >100k
XX - U1 pin 6, U1 pin 8 230-270 ohms --- >100k
XX - U1 pin 6, U1 pin 12 230-270 ohms --- >100k
XX - U1 pin 13, P2 pin 6 90-110 ohms --- >100k
OK - P1 pin 1, P1 pin 3 > 100 k
OK - P1 pin 2, P1 pin 3 > 100 k
OK - P1 pin 3, P1 pin 4 > 100 k
OK - P1 pin 3, P1 pin 6 > 100 k
OK - P2 pin 1, P2 pin 2 > 100 k
OK - P2 pin 7, P2 pin 8 > 100 k
XX - K3 pin 2, K3 pin 9 < 5 ohms --- >100k
XX - K3 pin 4, K3 pin 7 < 5 ohms --- >100k

Basically, everything that but the P1 & P2 checks seemed well out of
range, like I have an open somewhere.  I guess an open is better than
a short!  I took the time to fix some weak looking solder points, but
that didn't fix it.

Does anyone on the list have any advice for troubleshooting this?  So
far, I've thought about trying a different meter :) and as I
mentioned, fixing up some solder points that didn't look so good.

High res photos here:

Bottom
http://picasaweb.google.com/joseph.durnal/ElecraftK1TransceiverBuild/photo#5063510917493130034

Top
http://picasaweb.google.com/joseph.durnal/ElecraftK1TransceiverBuild/photo#5063510883133391650

Thanks to all
73
Joe
NE3R
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[Don Wilhelm-3]

Joe,

First check your meter - does it show zero ohms (or a very very low
value) when you touch the probes together?

The last two checks indicate the resistance through the low pass filter
toroids only, did you strip and tin the toroid leads adequately.

If you look at the schematic for the 2 band filter board, you will see
that the 1st 3 checks should indicate the resistance of the relay coil -
which is near 270 ohms, and the 4th reading should indicate the value of
R1.  Do you read 270 ohms between pins 1 and 10 of any of the relays?
And can you read the resistance of a 100 ohm resistor properly with your
meter?

Again, look at the schematic and you will see that these are simple
resistance checks - if the relays are oriented correctly (your photo
indicates they are, and the soldering is good (can't tell from the
photos), and your meter is working right, these checks should give the
expected readings.

73,
Don W3FPR

Joseph M. Durnal wrote:

> I have completed soldering the components for the K1 2 band filter
> board, but when I performed the resistance checks, there was a
> problem.
>
> XX - U1 pin 6, U1 pin 7 230-270 ohms --- >100k
> XX - U1 pin 6, U1 pin 8 230-270 ohms --- >100k
> XX - U1 pin 6, U1 pin 12 230-270 ohms --- >100k
> XX - U1 pin 13, P2 pin 6 90-110 ohms --- >100k
> OK - P1 pin 1, P1 pin 3 > 100 k
> OK - P1 pin 2, P1 pin 3 > 100 k
> OK - P1 pin 3, P1 pin 4 > 100 k
> OK - P1 pin 3, P1 pin 6 > 100 k
> OK - P2 pin 1, P2 pin 2 > 100 k
> OK - P2 pin 7, P2 pin 8 > 100 k
> XX - K3 pin 2, K3 pin 9 < 5 ohms --- >100k
> XX - K3 pin 4, K3 pin 7 < 5 ohms --- >100k
>
> Basically, everything that but the P1 & P2 checks seemed well out of
> range, like I have an open somewhere.  I guess an open is better than
> a short!  I took the time to fix some weak looking solder points, but
> that didn't fix it.
>
> Does anyone on the list have any advice for troubleshooting this?  So
> far, I've thought about trying a different meter :) and as I
> mentioned, fixing up some solder points that didn't look so good.
>
> High res photos here:
>
> Bottom
> http://picasaweb.google.com/joseph.durnal/ElecraftK1TransceiverBuild/photo#5063510917493130034 
>
>
> Top
> http://picasaweb.google.com/joseph.durnal/ElecraftK1TransceiverBuild/photo#5063510883133391650 
>
>
> Thanks to all
> 73
> Joe
> NE3R
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>

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