Greg,
Congratulations on your early Christmas gift!!! Sorry it is giving you
problems.
Before you start ripping things out or suspecting bad components, remember
that the design does work (and works very well), and that components rarely
fail.
The most likely problem is a poor solder joint or an unsoldered joint. As I
say many times ' Check the soldering, then recheck the soldering, and when
you have finished that, check the soldering.' That will fix the majority of
problems. The second most common problem is a misplaced component - so go
back over your components with the parts listing in hand and be certain all
the components you have placed are correct.
Good luck with it - work (and troubleshoot) in an orderly manner and you
will locate the source of the problem. Sorry, but I can't pinpoint it from
the information you provided thus far.
73,
Don W3FPR
----- Original Message -----
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
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