On 4/14/2011 8:38 AM, bill wrote:
On 4/13/2011 5:47 PM, [email protected] wrote:
Fluke.l is using my design except for a number of units which were
shipped with 0 ohm resistors where the 3 diodes were supposed to go.
This powers the CPU with 5 V instead of 3 and most don't last long at
that voltage. However, the symptom is a blank display.
Also, I understand some units have an actual 5 V regulator and some
expect a regulated 5 V.
I have tested a total of 9 units, 2 from fluke.l one from Dan Karg
and the other are mine against 3 Thunderbolts (2 group buys and one
of the original red boxes) and they all work. As long as the serial
data is enough to bias on and off the 2N2222, it should work.
Check the wiring and check that the serial data goes to the CPU.
There is not much that can go wrong if the CPU is working.
It is possible that the serial input to the CPU is fried while the
rest of the chip works, but I have never seen that happen. Yet I have
fried a number of these chips (I design HV supplies in my day job).
Didier KO4BB
OK I think I will check the signal going to the CPU. If it is there,
then I will throw the unit away.
If the signal is not at the CPU I will trouble shoot further.
Thanks for the suggestion everybody.
Bill K7NOM
**************
I just ordered a NEW monitor from fluke..l
Bill K7NOM
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