[Elecraft] dead K2

[Don Wilhelm]

Mike,

The symptom of not being able to do anything from the front panel is 
usually an indication that it is attempting to transmit as soon as power 
is applied.  The simple thing that can cause a transmit condition is a 
closed key (or PTT).  Remove anything from the micophone jack, remove 
anything from the key jack and the AUX I/O if you have one.  Connect a 
dummy load 'just in case' my transmit assumption is correct.
If you have the KPA100, it is preferable to power only the base K2, but 
if you have only the 12 volt cable for the KPA100, go ahead and use it.

After that bit of setup, power the K2 on - does it work?  If so, one of 
the external cables was putting it into transmit, your task is to find 
which one and correct it.
If you still have the same problem, remove the top cover (whether that 
be the KPA100 or the QRP cover.  You will be making a couple checks with 
your DMM.
Power on and check the voltage at the anode of both D6 and D7 (located 
halfway back about 1 inch from the left side panel).  During receive, 
you should find the anode of D6 near 8 volts and the anode of D7 near 
zero - during transmit, the anode of D6 should go to zero and the anode 
of D7 will be near 8 volts.  If both of them are near 8 volts when you 
power on, power off quickly and tell us about it.
In any case tell us what you found in the above steps before proceeding 
further (or making any assumptions).  An orderly progression of tests 
will lead you to the failure point.

73,
Don W3FPR

worsr wrote:
> My K2 #5767 suddenly has quit working.  Upon power up today,  the freq. readout is OK, but none of the buttons work and the tuning dial doesn't change freq.  No error messages are seen at powerup.  
>
> Anyone have any ideas??
>
>