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HP 42S printer annunciator



#4

I have a question / problem. Any time I execute a shifted key other than math operations, the print icon comes on the screen. The icon does not go off if I use the "POFF" command. It only goes off when I key the shift print followed by the "PRsummation" selection. Then I get a "Printing Is Disabled" message.
But the next time I key a shifted command like clear, it's back again.

Help would be appreciated.

Forrest


#5

Hi;

I'd guess your HP42S is set to TRACE mode, but the annunciator would go off by itself after printing. Have you placed an HP82240A or B in front of it to "see" if there's anything actually being sent to the printer?

Also, have you considered a memory clearing (Memory Lost) procedure? I mean, if you don't have it filled with long programs or important data (all data and programs are iomportant, but if they can be keyed back in, then it's a matter of having the time and pacience...), a clearing procedure may restore original condition. The HP42S has no external access to a hardware reset, but the [EXIT]/[SIGMA+]/[XEQ] should be enough. If not, short circuiting the battery terminals (remove batteries first) for five to ten seconds would also be fine. Of course, if you want to give it a try. This is just a guess, I'm not sure if the memory clearing will also solve the problem. BUT if it doesn't, I also cannot think of anything else but IC terminals with external short circuit (any sort of durt) or a faulty IC.

I wish I could help more.

Luiz (Brazil)


#6

Luiz,

I had removed the batteries for over two hours, then replaced them without any change. The exit/sigma/xeq did solve the problem. Thank you very much. I thought that leaving the batteries out of the calculator for two hours should reset it but obviously not. Thanks again, I really appreciate it.

Forrest


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