[Elecraft] K2 SELF RESETTING FUSE PROBLEM?

[Don Wilhelm]

John,

In several years of K2 repair experience, I have not found one instance 
of failure with the resettable fuse.  It is rated at 5 Amps.  Of course, 
yours could alway be the first failure.  Tap DISPLAY and monitor the 
actual current carefully through several shutdowns.  If the current does 
not spike to near 5 Amps, then yes, I would replace the fuse, but if 
your actual current shows any indication of sudden increases (spikes), 
then the fuse is likely doing its job properly and the source of your 
problem is elsewhere (likely in the PA transistors).

73,
Don W3FPR

John Stasiw wrote:
> Hi All,
> Recently my K2, #5384, began to power OFF after a few minutes of CW transmission and then resetting ON after a few seconds to minutes.
>
> This has happened when running anywhere from 2 to 10 watts into a matched load. (1 to 1:1)
>
> Maximum current levels have not exceeded the 3.5 AMP transmit limit preset in any monitored event. e.g. 1.6A at 2W and 2.18A at 5W.
>
> It would appear that the RGE 300 self resetting fuse is at fault.
> Is there any experience out there with faulty RGE 300's?
>
> regards
> John VE6GJ
>   
>