I didn't have the guts to pry out the large lcd display on the austron 2100. But I now realize the problem with its display.
Whats happening is noise from the ttl logic is falsely gating the cmos lcd drivers. This is a common engineering mistake when interfacing ttl to cmos logic. The recommended fix is to use an HCT part (74HCT240) as a bridge between logic types. Also I believe pullup resistors were another recomendation for interfacing ttl to cmos. Anyway I will keep the net advised as I eliminate noise in the austron 2100 display. Brooke Clarke wrote: > > Hi George: > > A common problem with the 2100 series units is that the LCD gets loose > in it's socket. > Unplug the two front panel ribbon cables, remove 6 screws. > Have a close look to see how the LCD is relative to the socket, then > carefully remove and reinstall the LCD. > Let us know if that fixes it. > > http://www.pacificsites.com/~brooke/A2100F.shtml > > Have Fun, > > Brooke Clarke, N6GCE > > -- > w/Java http://www.PRC68.com > w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml > http://www.precisionclock.com > > george wrote: > > >I just aquired my first Austron 2100F loran frequency monitor via ebay. > >I'm having trouble reading the display. There is leakage to other > >segments of the display that should normaly be off. > > > >To be most specific when I enter 8888 from the key pad the other blank > >digits start activating slightly when I enter 88888 all other digits are > >90% activated. > > The more segments of the displayed that are active creates more bleed > >over into the unactive segments at a very consistant amount. > > > >I've believe the problem is in the lcd display itself as I've > >substituted a different cpu/mpu out of my 2100R and the lcd problem > >still exists. > > > >Has anyone noticed even the slightesd leakage into the other segments > >of there 2100F's lcd display? > > > >I believe the ground return pins of the lcd display module itself has > >high resistance or is opening up completely allowing backfeeding from > >other segments. > > > >_______________________________________________ > >time-nuts mailing list > >[email protected] > >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > > > > > > > > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
