HP-67 advice needed Message #1 Posted by Alberto Fenini on 15 Jan 2011, 5:34 p.m.
Dear All,
I'm restoring an HP67, which was in bad to very bad conditions.
Battery contacts missing, very dirty and with a lot of oxidation.
I've cleaned the keys, the faceplate, and put all the electronics
in some vinegar for few hours.
I have recovered a couple of new battery contacts from an HP97
power pack and I have put some pieces back together.
I'm using a working HP-67 for the troubleshooting.
If I install the working board in the cleaned keyboard this is what
I get
Would you think of a bad soldered pin on the cathode or anode drivers or something more serious ??
Also, the back of the keyboard plate had some corrosion and has been partially recovered, now it looks now like :
Could this also be responsible for the bad display ??
If I put the cleaned board
into the working HP67 all I get
is the low battery led turned on.
I'm planning to do some seriuso rework in this unit,
desoldering everything an polishing the pcb, unless you have
a better idea.
As always, thanks in advance for any suggestion given
take care, Alberto
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