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isanchez · (This post was last modified: 05-20-2014 09:41 AM by isanchez.)

Dear Ignazio,

after spending some time in the forum, I have two possible answers to check:

1.- I have found the following Article by KATIE WASSERMAN. It states that the ACT is not fried, the problem is the noise that must be removed.

http://www.hpmuseum.org/cgi-sys/cgiwrap/...i?read=267

It recommends to install a 10 K resistor in the ACT chip...connecting pins 11 and 12.

2.- The problem is in a bad ACT module. Maybe your replacement ACT was not good. Many people associates 90% of 000000000 display problems to a bad ACT chip. The only difference is that, in our case, the calculator reponds to the keyboard input of numbers and programming mode...what makes me doubt...

Kind regards,

Ignacio