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K2 Front Panel Resistance Check Readings :(

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W0CD

K2 Front Panel Resistance Check Readings :(

I'm running into a problem with the resistance checks for the K2 Front Panel
Board. Specifically, I'm getting 0 reading from J1(1) - J1(7) and J1(12) -
J1(14).

My readings:

PIN // Expected // Actual

U1(1) // 25k-35k // 29.4k (GOOD)
U1(2) // 25k-35k // 29.5k (GOOD)
U1(3) // 40k-60k // 50.4k (GOOD)
U1(4) // >50k // 12.8M (GOOD)
U1(5) // 15k-40k // 24.6k (GOOD)
U1(6-11) // 0 // 0 (GOOD)
U1(12) // 9k-11k // 9.8k (GOOD)
U1(13-40) // >50k // >50k (GOOD)

J1(1) // >1M // 0 (*BAD*)
J1(2) // >1M // 0 (*BAD*)
J1(3) // >1M // 0 (*BAD*)
J1(4) // >1M // 0 (*BAD*)
J1(5) // >1M // 0 (*BAD*)
J1(6) // >50k // 0 (*BAD*)
J1(7) // >1M // 0 (*BAD*)
J1(8) // 0 // 0 (GOOD)
J1(9) // >50k // 26.9M (GOOD)
J1(10) // >50k // 9.4M (GOOD)
J1(11) // >50k // 22.5M (GOOD)
J1(12) // >50k // 0 (*BAD*)
J1(13) // >50k // 0 (*BAD*)
J1(14) // >50k // 0 (*BAD*)
J1(15) // 10k-60k // 71.6k (*HIGH*)
J1(16) // 25k-35k // 28.5k (GOOD)
J1(17) // 25k-35k // 28.3k (GOOD)
J1(18) // 15k-40k // 23.7k (GOOD)
J1(19) // 1.5k-3.5k // 2.5k (GOOD)
J1(20) // 0 // 0 (GOOD)

I did not install the SSB option yet as indicated in the manual.

For each J1 pin reading zero, I did conduct a continuity check between the
pin and other parts on the board based on the diagram in Appendix B. All
were successful. (Most were done between J1 pins and the empty rows holes to
the right of the NB button).

I feel like I'm missing something very simple. Look at the diagram, PINS 1-7
seem to work with voice functions (SSB). Should I expect to get values here
if the option isn't installed?

Thanks from a first timer...

W0CD
James

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Don Wilhelm

Re: K2 Front Panel Resistance Check Readings :(

James,

I would not worry about the reading at J1 pin 15, but the others
indicate a problem.

I do not know of your soldering skills, but it would seem that your
solder is bleeding over enough to contact the ground plane that
surrounds the connector and other solder pads on the board.

If you have a solder blob on any of the pins, that could be the problem.
Use solder wick to remove excess solder on the entire front panel
board and reflow the solder using only a minimal amount of solder.
See the soldering tutorial on the Elecraft website to tell you what a
good solder connection looks like.

73,
Don W3FPR

On 8/18/2019 1:48 PM, W0CD wrote:

> I'm running into a problem with the resistance checks for the K2 Front Panel
> Board. Specifically, I'm getting 0 reading from J1(1) - J1(7) and J1(12) -
> J1(14).
>
> My readings:
>
> PIN // Expected // Actual
>
> U1(1) // 25k-35k // 29.4k (GOOD)
> U1(2) // 25k-35k // 29.5k (GOOD)
> U1(3) // 40k-60k // 50.4k (GOOD)
> U1(4) // >50k // 12.8M (GOOD)
> U1(5) // 15k-40k // 24.6k (GOOD)
> U1(6-11) // 0 // 0 (GOOD)
> U1(12) // 9k-11k // 9.8k (GOOD)
> U1(13-40) // >50k // >50k (GOOD)
>
> J1(1) // >1M // 0 (*BAD*)
> J1(2) // >1M // 0 (*BAD*)
> J1(3) // >1M // 0 (*BAD*)
> J1(4) // >1M // 0 (*BAD*)
> J1(5) // >1M // 0 (*BAD*)
> J1(6) // >50k // 0 (*BAD*)
> J1(7) // >1M // 0 (*BAD*)
> J1(8) // 0 // 0 (GOOD)
> J1(9) // >50k // 26.9M (GOOD)
> J1(10) // >50k // 9.4M (GOOD)
> J1(11) // >50k // 22.5M (GOOD)
> J1(12) // >50k // 0 (*BAD*)
> J1(13) // >50k // 0 (*BAD*)
> J1(14) // >50k // 0 (*BAD*)
> J1(15) // 10k-60k // 71.6k (*HIGH*)
> J1(16) // 25k-35k // 28.5k (GOOD)
> J1(17) // 25k-35k // 28.3k (GOOD)
> J1(18) // 15k-40k // 23.7k (GOOD)
> J1(19) // 1.5k-3.5k // 2.5k (GOOD)
> J1(20) // 0 // 0 (GOOD)
>
> I did not install the SSB option yet as indicated in the manual.
>
> For each J1 pin reading zero, I did conduct a continuity check between the
> pin and other parts on the board based on the diagram in Appendix B. All
> were successful. (Most were done between J1 pins and the empty rows holes to
> the right of the NB button).
>
> I feel like I'm missing something very simple. Look at the diagram, PINS 1-7
> seem to work with voice functions (SSB). Should I expect to get values here
> if the option isn't installed?
>
> Thanks from a first timer...
>

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W0CD

Re: K2 Front Panel Resistance Check Readings :(

Don,

Thanks. I see quite a few others on this board have had the same problems in
the past. I'm wondering if my multimeter is reading 0 ohms due to infinite
resistance. I'll take a look at my soldering and see what I find. I didn't
notice much during my previous look last night.

For reference:

http://elecraft.365791.n2.nabble.com/K2-4670-Front-Panel-Resistance-Checks-td374437.html

(You replied to this one in 2006)
http://elecraft.365791.n2.nabble.com/K2-Front-Panel-Board-Resistance-checks-td386855.html

http://elecraft.365791.n2.nabble.com/Resistance-Checks-During-Front-Panel-Assembly-td392133.html#a392141

Thanks again.

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Don Wilhelm

Re: K2 Front Panel Resistance Check Readings :(

If the reading is actually zero - like when the leads are touched to
each other, then that is zero ohms, an indication of a short.
OTOH, if the reading is blank or whatever your ohmmeter reads when the
leads are attached to nothing, then that is an indication of infinite
resistance or something very high - and that qualifies as greater then
(> symbol) 100k ohms.

73,
Don W3FPR

On 8/18/2019 6:53 PM, W0CD wrote:

> Don,
>
> Thanks. I see quite a few others on this board have had the same problems in
> the past. I'm wondering if my multimeter is reading 0 ohms due to infinite
> resistance. I'll take a look at my soldering and see what I find. I didn't
> notice much during my previous look last night.
>
> For reference:
>
> http://elecraft.365791.n2.nabble.com/K2-4670-Front-Panel-Resistance-Checks-td374437.html
>
> (You replied to this one in 2006)
> http://elecraft.365791.n2.nabble.com/K2-Front-Panel-Board-Resistance-checks-td386855.html
>
> http://elecraft.365791.n2.nabble.com/Resistance-Checks-During-Front-Panel-Assembly-td392133.html#a392141
>
> Thanks again.
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

k6dgw

Re: K2 Front Panel Resistance Check Readings :(

Analog multimeters were so much easier!

73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 8/18/2019 4:21 PM, Don Wilhelm wrote:

> If the reading is actually zero - like when the leads are touched to
> each other, then that is zero ohms, an indication of a short.
> OTOH, if the reading is blank or whatever your ohmmeter reads when the
> leads are attached to nothing, then that is an indication of infinite
> resistance or something very high - and that qualifies as greater then
> (> symbol) 100k ohms.
>
> 73,
> Don W3FPR
>

Don Wilhelm

Re: K2 Front Panel Resistance Check Readings :(

Technician, know your tools! and know what the readings are telling you.
That is true both in the analog and the digital worlds.

73,
Don W3FPR

On 8/18/2019 8:00 PM, Fred Jensen wrote:

> Analog multimeters were so much easier!
>
> 73,
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
>
> On 8/18/2019 4:21 PM, Don Wilhelm wrote:
>> If the reading is actually zero - like when the leads are touched to
>> each other, then that is zero ohms, an indication of a short.
>> OTOH, if the reading is blank or whatever your ohmmeter reads when the
>> leads are attached to nothing, then that is an indication of infinite
>> resistance or something very high - and that qualifies as greater then
>> (> symbol) 100k ohms.

Don Wilhelm

Re: K2 Front Panel Resistance Check Readings :(

In reply to this post by W0CD

What are you seeing on your DMM display? Many DMMs show a blank display
for an infinite resistance, while others show a "+" and others show
"OL".

Look at your DMM display when the leads are separated. That is infinite
resistance.
If the display actually shows "0", (same as with the leads shorted
together) then that is a short circuit (zero ohms) that needs to be
investigated.

73,
Don W3FPR

On 8/18/2019 6:53 PM, W0CD wrote:
> Don,
>
> Thanks. I see quite a few others on this board have had the same problems in
> the past. I'm wondering if my multimeter is reading 0 ohms due to infinite
> resistance. I'll take a look at my soldering and see what I find. I didn't
> notice much during my previous look last night.
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