UPDATES after speaking with supplier tech support
> - display outputs gibberish characters on lines 1/3 when T2 writes to it. But
> I never see gibberish on lines 2/4
>
need to check the data leads for good connections or wrong wiring.
need to check the grounds.
> - When adjusting the contrast with the 10k pot, it would appear that only
> lines 1/3 are 'active' in the display.
>
apparently normal when device first boots up
> -I put an SPST switch on +5v input (pin 15 on the mono8) and
> here's the really weird part. When I turn on the switch, the display and the
> backlight LEDs come on. When I turn off the switch, the LEDS remain on, but
> dim down a bit. If I disconnect the 5vdc source the T2 - the LEDs still stay
> on.
>
definitely NOT normal.
need to check switch output with switch in OFF position
need to check all pins (especially 2/3/15) with switch OFF to see where voltage
is coming from
need to disconnect voltage from pin 3 and 15 and see how it behaves.
