K2 - KAT100 Resistance Checks Anomoly

[CJA]

I recently completed the resistance checks for the KAT100 and came up with the following seemingly minor anomalies:

U2 Pin 12 to Ground:  Target:  >100K  Measured:  .1 Ohms
U5 Pin 3 to ground:  Target:  45-55k   Measured:  56.0k

Are these problem areas or do I need to trouble shoot?  If these measurements are problematic, I would greatly appreciate guidance on where to start looking.

Thanks and 73,

Chris
K7CJA
K2#6442

[Don Wilhelm-4]

Chris,

The U5 Pin 3 to ground is not likely a problem - that reading will
depend on the exact setting of R3.  You apparently have it set a bit
above the center position.

The U2 Pin 12 is another matter altogether, and *is* a problem.  Look
for a solder bridge at U2 pin 12, U3 pin 12 and J1 pin 10.
On U2 and U3, the pins on either side of pin 12 are grounded, so I would
expect you will find the problem there.  Use some solder wick and wick
away any excess solder.  If the solder fills the thru-plated hole, that
is enough.

73,
Don W3FPR

CJA wrote:

> I recently completed the resistance checks for the KAT100 and came up with
> the following seemingly minor anomalies:
>
> U2 Pin 12 to Ground:  Target:  >100K  Measured:  .1 Ohms
> U5 Pin 3 to ground:  Target:  45-55k   Measured:  56.0k
>
> Are these problem areas or do I need to trouble shoot?  If these
> measurements are problematic, I would greatly appreciate guidance on where
> to start looking.
>
> Thanks and 73,
>
> Chris
> K7CJA
> K2#6442
>
>  

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