Re: HP-15C locks up when certain keys are pressed Message #2 Posted by Vieira, Luiz C. (Brazil) on 20 Dec 2007, 7:08 p.m., in response to message #1 by Greg Gosian
H;
I am not sure about it, but when you mention REV D circuit board, do you mean the revision with a single PCB or the one with the flex circuit board with the LDC and electronics? I cannot remember...
In any case, the keyboard matrix is the same, i.e., left and right half of it share the same columns (5) and each half has its own four rows.
First (maybe silly) question: [ON]/[×] self-test returns O.K.?
Keyboard test ([ON]/[÷]) maybe out of question because the [÷] key seems troubled, but...
I'd check if there is any conductive 'thingy' connecting copper trails of the processor's terminals, mostly in the terminal connected to the common row these keys share.
Hope this helps a bit.
Cheers.
Luiz (Brazil)
|