30 Dec
2009
30 Dec
'09
5:17 a.m.
I assume you mean that the power rails were fine, and
there were sensible
waveforms on the other pins.
Indeed, voltages ok and syncsignals as described in the HP Journal article.
The small PCB mounted on the back generates a
blanking signal that was
also correct.
Right. It's neen a long time since I've looked at one of these displays. Is
this a little PCB on top of the display PCB itself?
This was
indeed the culprit : it is a 5V to 5V isolation converter, used
to power some logic that is required on the far end of high voltage
Where does it get the HV from? It must be generated on the display board itself.
> I would still be interested in any schematic of
the driver electronics
> of any Epson electroluminiscent display
Of course is is actually a Sharp
display...
Still would like to know why it needs a CPU & Eprom, since it has
already all required signals.
Jos