Opening up a 10B (for repair hopefully)

[Chris]

I gave this unit to my father a number of years ago (found it in the bargain bin at Walmart). He told me the other day the batteries needed replacing, so went out and bought some...but evidently that wasn't the problem. How would I open this thing, hopefully w/o marring it? Is it likely the problem is an easy fix? Thanks.

[Karl Schneider]

Chris --

This is basically a FAQ. Please look for Paul Brogger's HP Articles Forum entry, Pioneer "Observational Internals".

-- KS

[Eric]

Before you crack open the case, check out www.fixthatcalc.com... From that site...

"I changed my batteries and now my calculator is dead!

Always, always - before changing batteries, back up any programs or solver equations!

The models listed above all share the same battery size and type. The three small coin cell batteries will last a minimum of a year or more, depending upon use. One common problem is after installing new batteries, the calculator appears dead and will not power up. This can be sometimes be fixed by completely resetting the calculator and completely clearing memory. Here's how:

Remove the battery cover and shake the batteries out with a few sharp smacks against the palm of your hand. Now, using a small coin (dimes and pennies work best), slip the sides of the coin between the battery spring clips so that you touch both sides of the battery clips at the same time with the coin. This discharges the internal storage and will clear memory. Now, reinstall the batteries, observing the proper polarity picture shown on the case, slip on the battery cover and turn it on. You should see a "Memory Clear", "Pr Error" or similar message and you're back to calculating."