[Elecraft] K2 Front Panel Board - Resistance Measurements ??

Wed Jan 1 21:35:01 2003

Bob- thanks for the reply. If I'm not misinterpreting the schematic
incorrectly, Pin 3 on J1 on FP board connects to the audio pot wiper (middle
pin). J1 pin 3 then goes off to the RF board, and ultimately the control
board. When making resistance measurements as indicated on page 27 in the
manual, I believe (unless I've missed something here) that the resistance
measurement to ground on the FP board from J1 pin 3 should be infinite, and
not zero ohms. I'd agree, once the RF board and Control boards are
connected, then I would expect zero ohms.

I'm thinking that the stated resistance value in the manual on page 27
should read > 1M ohm rather than zero ohms when measured to ground on the FP
board, with the board disconnected from everything.

If I'm incorrect here, I'll need to go back and recheck everything, but to
be honest I have no idea what to look for.

Dean, K9FTB

----- Original Message -----
From: "Bob - AG5Q" <[email protected]>
To: "Dean Maples" <[email protected]>; <[email protected]>
Sent: Wednesday, January 01, 2003 8:19 PM
Subject: Re: [Elecraft] K2 Front Panel Board - Resistance Measurements ??

> Hi Dean,
>
> Pin 3 is a ground pin just like 18 and 20, so this has to be zero ohms.
> This is a good place to start looking since the test condition is the
> simplest.  Double check the solder joints on the wire you're using for the
> ground connection for your meter.  Sometimes the solder will appear to
> surround the wire or terminal but it doesn't actually make contact due to
> some slight film on the wire. It takes extra heat and maybe a little
rubbing
> with the soldering iron tip to thoroughly heat the wire and make the
solder
> wet it for a good contact.
>
> For a little different test, measure the resistance between J1 pins 1 and
2.
> This is the AF Gain pot. As you turn the pot, this resistance should
change.
> Likewise, the resistance from pin 19 to ground should change as you turn
the
> RF Gain pot.
>
> 73/ Bob - AG5Q
>
>
> ----- Original Message -----
> From: "Dean Maples" <[email protected]>
> To: <[email protected]>
> Sent: Wednesday, January 01, 2003 6:01 PM
> Subject: [Elecraft] K2 Front Panel Board - Resistance Measurements ??
>
>
> > Happy New Year All.
> >
> > Just completed the the front panel board on K2 SN 3043. I made the
> > resistance measurements at the end of the build cycle and only had 2
> > measurements display the correct values on J1. On J1 pins 8 & 20 were
okay
> > (zero ohms). Everything else was infinite. I inserted the male plug into
> J1
> > thinking I didn't have a good connection with the pins on J1  - no
> > difference. All the U1 measurements were okay. I reheated all the J1
> > connections, inspected all the switches, pots, chips, etc. but really
> > couldn't find any issues (I have glaucoma and very big magnifying
glass -
> so
> > this small work is a real challenge!).
> >
> > Any ideas on how to proceed?
> >
> > 73's & HNY,
> > Dean, K9FTB
> >
> >
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