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+--- Thread: HP-65 missing all "g" segments (/thread-15259.html)
HP-65 missing all "g" segments - albertofenini - 06-25-2020 10:05 PM
Hi everyone,
we need a bit of help with this one as well ...
works fine but what shown on the picture should be a full 888888888 display
i.e all the "g" segments are missing.
We think it could be a faulty Anode Driver 1820-1029 and possibly the 11th pin
which should drive the g segment, but any advice or suggestion about what
to measure and what to expect is welcome !!
thanks in advance !!
Pictures : HP-65 missing all "g" segments
RE: HP-65 missing all "g" segments - teenix - 06-26-2020 06:04 AM
(06-25-2020 10:05 PM)albertofenini Wrote: Hi everyone,
we need a bit of help with this one as well ...
works fine but what shown on the picture should be a full 888888888 display
i.e all the "g" segments are missing.
We think it could be a faulty Anode Driver 1820-1029 and possibly the 11th pin
which should drive the g segment, but any advice or suggestion about what
to measure and what to expect is welcome !!
thanks in advance !!
Pictures : HP-65 missing all "g" segments
Hi Alberto,
I'd say, you've probably nailed the problem, pcb track, solder connection etc.
cheers
Tony
RE: HP-65 missing all "g" segments - albertofenini - 06-26-2020 06:07 AM
Hi Tony
Are those segments joined by a single pcb trace ?
Does anyone have a schematic other than Tony Dwell’s
One that allow to see traces and connections ?
Thanks for your reply !
RE: HP-65 missing all "g" segments - teenix - 06-26-2020 06:20 AM
(06-26-2020 06:07 AM)albertofenini Wrote: Hi Tony
Are those segments joined by a single pcb trace ?
Does anyone have a schematic other than Tony Dwell’s
One that allow to see traces and connections ?
Thanks for your reply !
Yes, they should be.
I don't have PCB trace or connection diagrams, but I have some cleaner schematics at...
http://www.teenix.org/classSchm.zip
cheers
Tony
RE: HP-65 missing all "g" segments - albertofenini - 06-26-2020 07:08 AM
Thank you very much !!