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HP Forums / HP Calculators (and very old HP Computers) / General Forum v / Restoring a HP9830B calculator.

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Restoring a HP9830B calculator.
04-21-2014, 05:47 PM
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MattisLind Offline
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Joined: Apr 2014
Restoring a HP9830B calculator.
Hello all!

I am about to start a restoration project to restore our HP9830B calculator. It is quite dirty exterior wise. But looks OK on the inside. This machine includes a printer and two 7900 disk drives and a controller. It seems that once upon a time it has been used for accounting since we have function key templates which indicate so.

The problem is that four keys are broken off and that that three key tops are missing. Those are "DELETE LINE", "END", and "5". I have been told that HP264X terminal use the same key tops. But those don't have the "DELETE LINE" nor "END" keys, only the "5".

Does anyone have spare key tops to sell? Does anyone have have those Cherry key switches? Maybe it is possible to repair them by melting in some metal into the upper part. But I haven' tried yet.

[Image: HP9830_Cherry_keyswitch.png]
By the way, does anyone know the Cherry model name for these switches so I can start search around for it?

Next step is to dig into the power supply and check capacitors.

All help greatly appreciated!
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Restoring a HP9830B calculator. - MattisLind - 04-21-2014 05:47 PM



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