K2 hangs when using TUNE

[Simon & Liz Watts]

K2 builders,

I have a K2/100 #3834 with KSB2, K160RX and using a KAT100.
Occasionally, I experience a malfunction when using the TUNE function.  The transmitter starts to transmit and then the whole set freezes with low current drain, the receiver is dead and all buttons are inoperative.  The K2 has to be reset by switching off and then switching on again.  This state may persist for successive applications of TUNE for some time but on each occasion so far it has eventually reverted to normal working.  When present, the fault persists after the KAT100 is disconnected.

Does anyone have any suggestions as to what may be causing this?

Simon
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[Don Wilhelm-3]

Simon,

We really need more information about what you are observing - questions
occur such as Does the LCD display show anything or is is blank?  If not
blank, what is displayed?  Do you have any other indications, such as the
LED indicator?

What is the input voltage from your power supply when this condition occurs?
Remove the KPA100 and measure the voltage directly at the KPA100 input power
jack and also at the power supply terminals.  This sounds like a typical
case of the power supply going into a current foldback state which will
correct itself either after a time of low current or after the load is
temporarily removed (by powering the K2 off).

73,
Don W3FPR

> -----Original Message-----
>
> I have a K2/100 #3834 with KSB2, K160RX and using a KAT100.
> Occasionally, I experience a malfunction when using the TUNE
> function.  The transmitter starts to transmit and then the whole
> set freezes with low current drain, the receiver is dead and all
> buttons are inoperative.  The K2 has to be reset by switching off
> and then switching on again.  This state may persist for
> successive applications of TUNE for some time but on each
> occasion so far it has eventually reverted to normal working.
> When present, the fault persists after the KAT100 is disconnected.
>
> Does anyone have any suggestions as to what may be causing this?
>
> Simon
>

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[Simon & Liz Watts]

Don,
Thanks very much for your reply.  Of course it is working OK at present.  I
will make more careful notes of the symptoms next time it occurs and report
back.

Simon

----- Original Message -----
From: "Don Wilhelm" <[hidden email]>
To: "Simon & Liz Watts" <[hidden email]>;
<[hidden email]>
Sent: Tuesday, October 10, 2006 12:45 AM
Subject: RE: [Elecraft] K2 hangs when using TUNE

> Simon,
>
> We really need more information about what you are observing - questions
> occur such as Does the LCD display show anything or is is blank?  If not
> blank, what is displayed?  Do you have any other indications, such as the
> LED indicator?
>
> What is the input voltage from your power supply when this condition
> occurs?
> Remove the KPA100 and measure the voltage directly at the KPA100 input
> power
> jack and also at the power supply terminals.  This sounds like a typical
> case of the power supply going into a current foldback state which will
> correct itself either after a time of low current or after the load is
> temporarily removed (by powering the K2 off).
>
> 73,
> Don W3FPR
>
>
>> -----Original Message-----
>>
>> I have a K2/100 #3834 with KSB2, K160RX and using a KAT100.
>> Occasionally, I experience a malfunction when using the TUNE
>> function.  The transmitter starts to transmit and then the whole
>> set freezes with low current drain, the receiver is dead and all
>> buttons are inoperative.  The K2 has to be reset by switching off
>> and then switching on again.  This state may persist for
>> successive applications of TUNE for some time but on each
>> occasion so far it has eventually reverted to normal working.
>> When present, the fault persists after the KAT100 is disconnected.
>>
>> Does anyone have any suggestions as to what may be causing this?
>>
>> Simon
>>
>
>

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