[Elecraft] P3 Failure, and question

[Dave Cole]

Hi Ben,
Thank you for the information!!!  I will look to see if that cap is wrong!

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 4/12/21 3:37 PM, w4sc wrote:
> I had a similar problem.
> 
> I purchased a P3 kit in 2015, assembled, and it worked well.  The firmware as received, was a rev behind.  Trying to upgrade via the normal method, was unable to accomplish.  Trying to force an upgrade, was unsuccessful.  Had to return for warranty repair.  The EEPROM was corrupted.
> 
> All was OK until about 4 years ago, the P3, occasionally, would not boot up. I received some guidance from one of the engineers, to check a capacitor in the P3 power supply.  If it was a tantalum  (10 uF I believe), it was the incorrect value, and to change to 0.1uf (1206 sized).  After the capacitor change, no more powerup issues.  I believe there was a supply sequencing issue.
> 
> I am looking for the details, and when found, I will post.
> 
> Ben W4SC
> 
> Sent from Mail for Windows 10
> 
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