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- shut down the device - press power button for about 10 s (support said, this will discharge the electronic elements) - if this helps, it should be a software issue, if not, a hardware issue.

The HP-42S, HP-27S, HP-17B, and HP-17BII have an IR transmitter for use with an HP82240A/B printer. Each of these four calculators will transmit a print signal for every input if "TRACE" mode is set.

The HP-27S, HP-17B, and HP-17BII also have a built-in clock that cannot be switched off. This will reduce battery life, but not to the extent that you are seeing.

batteries must be removed for at least 24 hours to drain the capacitor completely.