HP-67 keyboard restoration - Printable Version +- HP Forums (https://archived.hpcalc.org/museumforum) +-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html) +--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html) +--- Thread: HP-67 keyboard restoration (/thread-165661.html) |
HP-67 keyboard restoration - Pierre Brial - 04-12-2010 Hello,
Did you already experienced this problem ? The procedure described in http://www.hpmuseum.org/howtohp/howtohp.htm recommend the use of sandpaper to clean the gold plating. But may be there is a softer way to do ?
Re: HP-67 keyboard restoration - Jose Poyan - 04-12-2010 Hi,
regards, Re: HP-67 keyboard restoration - Pierre Brial - 04-12-2010 Hi Jose, I don't have this rattling problem on the HP-67, but I did have it on an HP-45. There are metal strips under the plastic keys, which give to hp calcs keyboards their distinctive click. Theses strips were cracked, and even cut on some keys. So keys losed their firmness, and the electrical connection was lost on cutted ones. Il repaired the connections by soldering tin on the cracks, but I lose the elasticity of the keys. Regards
Pierre
Re: HP-67 keyboard restoration - Jose Poyan - 04-14-2010 I see... As I said I dind't open my hp67, but I can tell you about a repair I did on my HP34c last week.
I bought from ebay silver contact paint that comes in small 3 grams glass tubes, for £4. I used this paint to cover the metalic strips on the pcb. I used it too to paint the contact strip on the membrane that was broken for the key "1" (my version of hp34c uses a plastic membrane for the keyboard, with bubbles on the keys and metalic strips for contacts)
Then I bought cupper tape, that are used in plants to avoid insect, and you can get from ebay for £3, and it's the same as the aluminium tape but cupper one. I suggest you to use Silver paint for the contacts. Please let me know if you find the bent strips bronken when you open your hp67.
regards, Re: HP-67 keyboard restoration - Pierre Brial - 04-15-2010 Yes it was the bent strip that were broken. Good idea the cupper tapes.
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