K2, resistance check Q7

[Erik Linder]

Hi gang,

My reading for Q7 base is too low, but not shorted.
I get 760 ohm...
But I should get 2.5 to 3 k ohm.

I have worked my way through the schematics.
At R62 I get zero one one side and 870 on the other.
At R60 I get 870 and 760.
The low resistance must be somwhere between R60 and Q7 base.

I have removed all passive components that connects to ground: C137,
C129, C130, C138.

No change.

I don't think any of the T's are shorted, cos I dont see zero ohms.

Please give me some hints if you can, on how I can proceed.

Tnx
SM0RVV ./Erik
K1 #1978
K2 #4904 (at stage III)
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[Erik Linder]

Hi again and welcome to the series "Get to know your DMM".
This week well learn how to use the setting "Auto" and "Manual".
:-)

I found out just now that my DMM shows different readings in "auto" and
in "Manual".
If I set the DMM to Manual and kohm i get the correct reading of 2.7
kohm. But if I set it at auto I get 760 ohm...

It must be different values of voltage the DMM uses to measure in auto
and manual.

OK, case closed.
I will proceed with alignement in step III

Sorry for the noice on the list....

SM0RVV ./Erik

Erik Linder wrote:

> Hi gang,
>
> My reading for Q7 base is too low, but not shorted.
> I get 760 ohm...
> But I should get 2.5 to 3 k ohm.
>
> I have worked my way through the schematics.
> At R62 I get zero one one side and 870 on the other.
> At R60 I get 870 and 760.
> The low resistance must be somwhere between R60 and Q7 base.
>
> I have removed all passive components that connects to ground: C137,
> C129, C130, C138.
>
> No change.
>
> I don't think any of the T's are shorted, cos I dont see zero ohms.
>
> Please give me some hints if you can, on how I can proceed.
>
> Tnx
> SM0RVV ./Erik
> K1 #1978
> K2 #4904 (at stage III)
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>

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[Erik Linder]

A combination of guessing and logical thinking.

In auto I get "wrong" reading.
In manual <10 k I get 2.7 k.
In manual < 1 M I get 3 k

So it's 2 against 1...

And the two values is what to expect, the odd value is - odd...

I'll promise to post a message when the smoke has dissappeared efter I
have connected the power. ;-)

./Erik

[hidden email] wrote:

>
> How do you know which reading to believe?
>  
> K3UJ

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[Erik Linder]

My K2 survived the smoke test.
It's not aligned yet, but I can hear and transmit on all bands.

Stupid DMM, I lost some good building hours there!

./Erik

Erik Linder wrote:

 > I'll promise to post a message when the smoke has dissappeared efter
I have connected the power. ;-)
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