Needing help with my 48s

[Palmer O. Hanson, Jr.]

My 48s is doing strange things. It started by entering both a 5 and a 6 when I tried to enter only a six. Then it went into a mode where I could not enter a zero. The batteries were low so I inserted a new set. I still get the inability to enter a zero and when I try several times in a row everything locks up.

I have tried all of the tricks on pages 665 and 666 to no avail. Any ideas would be appreciated.

[Reth]

Soak it up to the screen in clean water for a day. Then leave it to dry for a couple of days. If it still doesn't work, go get another one, they aren't expensive these days.

[wildpig]

you really mean this? wow, so our calculator can actually take on water also? ;)

And yes, 48S are probably one of the cheaper old hp to get... I would actually get the 48G or GX if you don't want to get the 50G

Edited: 2 Sept 2012, 2:27 a.m.

[Randy]

Quote:

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Soak it up to the screen in clean water for a day. Then leave it to dry for a couple of days. If it still doesn't work, go get another one, they aren't expensive these days.

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IMO, the first bit of advise is incorrect, the second, spot on.

A water bath will do nothing, you'll need the vibration of an ultrasonic cleaner and a surfactant cleaning agent to get the offending bits of conductive material out of the key dome areas. In the end, you may get a few more months or years of use out of the unit but ultimately, it is time to replace.

[Reth]

worked once for me, after battery leakage. Not saying will necessarily fix it.

[John Mosand]

Worked for me as well, after the cat spilled a flower vase with fertlizer liquid over my 48SX 12 yrs ago. I flushed it thoroughly in running water, shook out most of the water and dried it in an oven(!) It still works perfectly...

[Manolo Sobrino]

[Of course, desiccation in a convection oven, NEVER in a microwave oven :)]