[Elecraft] K2 Info 090 at first test

[Gregory P. Daly]

My Christmas gift (OK, I opened it early) says "Info 090" when powered
up. According to the manual this is "EEPROM Test #1 failed".

At power up, relays click for a short period, and the display says INFO
090. The front panel buttons make the display change to many wonderful
and cryptic things that I'll figure out later, the tuning knob makes
things change, so I think the display board is working

On the control board the regulated +5V is in good shape. The 4 MHz clock
on U6 makes 5v Peak to Peak on pin 14 and is easily adjustable above and
below 4 MHz. Pins 1, 2, and 3 of U7 (EEPROM) have short bursts of 5V P-P
data at power up and then rest at +5V, supply and ground pins on U7 all
have expected voltages.

The D to A converter, U8 seems to be working, it generates a 5V P-P tone
signal on pin 4 shortly after power up. Pin 1 rises to +5 volts shortly
after power up.

I think the controller, U6 is working, and the EEPROM is bad.

Is my analysis way off here? I'd hate to do something rash, like rip out
a good part to prove I'm an idiot, or make things worse fixing things
that aren't broke.

Thanks and 73

Greg
WB7RSG