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HP Forums / HP Calculators (and very old HP Computers) / General Forum v / Hp-70 incorrect key registering

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Hp-70 incorrect key registering
03-19-2016, 01:23 AM
Post: #1
aj04062 Offline
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Joined: Dec 2013
Hp-70 incorrect key registering
I am trying to fix a HP-70 for a fellow enthusiast. The symptoms are:
Several keys such as /, O and . Do not register correctly. For example the decimal key is interpreted as the change sign key.

To rule out corrosion or something else on the keyboard, I paired up a 45 motherboard to the keyboard. With this combo it works as it should.

So, this leads me to conclude it is the 70 motherboard. But what chip has failed? A common one or one unique to the 70?
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Messages In This Thread
Hp-70 incorrect key registering - aj04062 - 03-19-2016 01:23 AM
RE: Hp-70 incorrect key registering - TASP - 04-10-2016, 06:09 AM
RE: Hp-70 incorrect key registering - TASP - 04-11-2016, 03:23 AM



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