K2 current sense problem

[GW4IMC]

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[n8ewy]

Be advised ...... I am an amateur.  An amateur with a great deal of
experience going back and checking solders.  Checking them again and than
once again.  Without response from anyone else I would be searching the area
of the solders at or near the LCD and the vicinity.  When you are done, look
again.  Just a word from the amateur rank.

Dohn  N8EWY

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of TREVOR WATERS
Sent: Saturday, February 03, 2007 12:03 PM
To: [hidden email]
Subject: [Elecraft] K2 current sense problem

Hello All,
This is my first posting so fingers crossed that I get
it right.
I am currently at stage two, testing and aligning K2
No 5914. After a few problems( poor sodering on T7)
finally got to hear something on 40 so much relief. In
the first stage test everything was ok but now when
pressing the display button to get up voltage and
current there is only the voltage showing and zero at
the current  13.7   000  so I'm a bit stuck and  would
appriciate any help. I suspect Q11 which is being
driven by U3A the LMC6482AIN but being a novice and
the k2 being my first real kit I am unsure and would
appriciate any help. By the way I am building the
basic CW version
Best 73
Trev GW4IMC
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[Don Wilhelm-3]

Trevor,

You have the correct area to look for the problem - Q11, U3 and the
associated components.
Check the soldering carefully, be certain Q11 is oriented properly, and
check all the components that connect to Q11 and U3A (those components shown
on the schematic).

You will most likely find that your problem is with the soldering.  Look for
that elusive unsoldered connection and re-flow the solder on other
connections with an iron set to about 750 deg F.  Be certain there are no
solder bridges.

73,
Don W3FPR

> -----Original Message-----
>
> Hello All,
> This is my first posting so fingers crossed that I get
> it right.
> I am currently at stage two, testing and aligning K2
> No 5914. After a few problems( poor sodering on T7)
> finally got to hear something on 40 so much relief. In
> the first stage test everything was ok but now when
> pressing the display button to get up voltage and
> current there is only the voltage showing and zero at
> the current  13.7   000  so I'm a bit stuck and  would
> appriciate any help. I suspect Q11 which is being
> driven by U3A the LMC6482AIN but being a novice and
> the k2 being my first real kit I am unsure and would
> appriciate any help. By the way I am building the
> basic CW version
> Best 73
> Trev GW4IMC
>

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No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.432 / Virus Database: 268.17.21/665 - Release Date: 2/2/2007
11:39 PM

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