[Elecraft] Resistance Checks During Front Panel Assembly

[Don Wilhelm]

Michael,

A resistance reading stated as >50k can indeed be an open circuit.
Infinitity is greater than 50k.
One reason they are should not listed in the manual as open circuit is that
many meters will respond to just the resistance of your body should you make
contact with the probes.

If you follow the schematic, you will indeed find that at this point of
assembly, those points are really open circuits.  The resistance check is
mainly to find any solder bridges or other assembly errors - since your
meter reads as though they are open circuits, all is well.

There is a statement that the high resistance readings may actually indicate
infinite resistance, exactly as you have found to be true.  No need to use
another meter to check anything.

73,
Don W3FPR


> -----Original Message-----
>
> Hi all. I just got my K2 in the mail this morning (hooray!) and I've
> been busily assembling. I did the control board and all checked out
> there. Now I've soldered most all of the front panel and I got to the
> resistance checks and ran into a problem.
>
> Now when doing the resistance checks so far, when the manual says a
> range, things have been in that range. When the manual says ">50k" or
> ">1M", things have been fine. My meter reads something (usually about
> 4-6M). So I went through the resistance tests three times but I'm
> running into problems.
>
> The first 40 test points (the pins on the LCD driver IC, U1) worked
> fine. Everything was as expected.
>
> Then I got to the 20 tests on J1. The first 7 pins of J1 (measured at
> the solder point) are all "OL" which is my meters way of telling me
> that the probes aren't connected. In other words, infinite resistance.
>
> Most of the rest of J1 works. Pin 8 measures zero, pin 10 measures
> 4.4M (should be >50k), pin 12 and 14 both work (6.6M), and everything
> 15 and above checks out too.
>
> Pins 1-7, 9, and 11 all register as unconnected. I've even tried
> measuring from other pads that are connected by traces (for example,
> some of those connect to where the shaft encoder will go) but they
> still register unconnected.
>
>