[Elecraft] KRC2 trouble shooting

[Don Wilhelm]

Kazu,

Is there any chance that you can beg or borrow an oscilloscope to probe 
U1 pins 13 and 14 to see if there is any 4 MHz oscillation?
If it is oscillating, my guess is that you have a damaged input or 
output pin on the firmware chip.
If it is not oscillating, then either the firmware chip is bad or the 
crystal is bad (or both).  If you are ordering replacements from 
Elecraft, get both just in case.

73,
Don W3FPR

Kazunori Watanabe wrote:
> Thanks for everyone for suggestion. 
> Here is some update. 
> 1) Power polarity is right. :-)
> 2) LED is still off and no output, so page 15 test failed this time. 
> 3) Checked soldering. Seems ok. 
> 4) Try to connect to PC through firmware download software and configuration utility. 
> However software cannot recognise. Well, so no LED means KRC2 is dead.....
> 5) Checking voltage of U1. Not a surprise Pin 9 and 10 are 0v as these are source of voltage of LED. 
> Compare to page 28 chart, most of pin's voltage are ok EXCEPT, 
> P3 0
> P6 0
> P8-10 0
> P17 0
> P27 0
> P29 0
>
> Wish I can fix it before RDXC!
>
> 73 de Kazu  JK3GAD/M0CFW
>   
>