[Elecraft] K2 cannot be swithed ON properly.

[Geoffrey Mackenzie-Kennedy]

Ueli,

My K2/100 #3255 has frozen on two occasions.

Try removing the MCU (U6) on the Control Board from its socket, and then 
plug it back into its socket. Doing this should clean the connections 
between the IC and its socket, and should defrost your K2 if that is the 
source of the problem..

Because the type of socket used is well known for "corrosion" problems, 
after the second "Freeze" I changed U6's socket in my K2 to a Turned Pin 
type (aka Machined Pin type).

Good luck!

73,
Geoff
GM4ESD


Ueli Zulauf HB9MFK wrote on Wednesday, September 23, 2009 at 5:06 AM

> After years of operation my K2 cannot be swithed ON properly.
> - Configuration: K2 (No. 3680) with KDSP2, KSB2, KNB2, KAT2, K160RX.
> - By switching ON the display shows Elecraft for 3 seconds and thereafter 
> the last used frequency (28.15 MHz).
> - All keys and the VFO are inactive.
> - Current drain is 400mA (to high).
> - Noise of several relays during power-ON is audible.
> - Speaker brings (AF-gain dependend) audio for < 1 second and thereafter 
> the audio is muted.
> - by changing TX power, the level appears on display as normal.
> - Transmit is not possible.
> - LED on KDSP2 extinguish after < 1 second (communication schould be OK)
> - 5 VDC and 8 VDC on the control board are OK.
>
> Has someone a good idea how to de-freeze this blocked K2 ?
>
> 73, Ueli / HB9MFK