|Re: HP-41C bad display - where to start from ?|
Message #4 Posted by Alberto Fenini on 12 Feb 2012, 4:13 a.m.,
in response to message #3 by Raymond Del Tondo
Thank you very much for your replies.
This is what I have :
The unit on the left is the complete HP41C I have purchased, it has the bacon zebra strip and few (two to my knowledge) segments not working on the second digit.
Then, on the right, I have the upper half shell of a blanknut, it includes the keyboard, the display, the gold zebra strip.
This unit was purchased as a spare for my Blanknut, just in case ... It's from "Better Control Medical Computers inc." as the front label reads, it was used in a medical environment as part of a proprietary system for insuline dosage.
Now, the back of the orginal HP41-c looks like this :
It looks nice, but, some cold soldering or detached links may always be possible. I don't know what's happend to the original unit, but I would exclude it has been dropped, since the rest of the case is in good conditions, no chips, no cracks.
The back of the Blanknut looks like this :
The only thing I did, was to move the CPU board from the original HP41 to the half Blanknut, at first using the gold zebra strip, than I also tried with the bacon zebra.
Question :is there any way, to lit up all the segments (no, I don't have the test module), may be just applying a low voltage to the display contacts, and check the functionality ?
This would isolate the problem eventually to bad contacts between the cpu board and the keyboard board because of the zebra connectors
Thanks everybody !
Have a nice weekend, Alberto