|Re: 15c "clicking and popping" keys|
Message #4 Posted by Vieira, Luiz C. (Brazil) on 24 Feb 2003, 2:40 p.m.,
in response to message #3 by Ron Ross
depends much on the HP12C's internals.
If it is a Chinese with one button-type battery, I think there are no parts to be "donated", sorry. Even the LCD was mentioned to be not compatible because of the operating voltage. In fact, newer HP12C, Chinese type as decribed above, have a different "font type" in the annunciators, instead they keep GRAD and USER, that are only active when testing the calculator ([ON][+] or [ON][×]; this was one of the pilars that made me believe old voyagers would come back). Anyway, for the Indonesian models with three 1.5V button cells and one single IC inside, at least the LCD is compatible, if you donot care for the golden reflexive backplane.
Older models have an equivalent and compatible keyboard scanner together with the LCD module, but it applies only to earlier (first type) models, with two IC's. The keyboard scanner is common to the HP11C, 12C, 15C and 16C (I do not have an HP10C to check for it) and it proven to be fully compatible. I have soem scans I'll upload to a fellow's page and I'll post the address so anyone can download them.
About serial #: I have no information over this subject, but I know many Voyagers' back covers are tradable (I confused myself with three of them and I think I trded them up...) and information may not apply to some "refurbished" calcualtors.
Hope this helps a bit. If you need information about IC's IDs, e-mail me and I'll collect data about it. And post it, if applicable.