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User06182020
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An old HP-41CV, refuses to turn on

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HP-41CV

I have an old HP-41CV, that refuses to turn on, even though I changed the batteries recently.

 

am I doing something wrong?

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Joe_Horn
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You asked this same question a month ago in another thread, but apparently never saw the answer I posted there. Here is my answer again. I hope you see it this time, and I hope it helps.

 

(1) Remove all plugged-in modules and peripherals.

(2) Replace all four batteries with N cells which you actually tested outside the calculator for good voltage, then insert the batteries into the battery holder being careful to alternate their polarity according to the "+" and "-" signs molded into the bottom of the battery holder.

(3) Install the battery holder into the calculator.

(4) Press down the back-arrow (backspace) key and keep holding it down.

(5) Press the ON key for a few moments then release it.

(6) NOW release the back-arrow key.

 

You should see MEMORY LOST. The keyboard should respond like normal now.

 

If you don't see MEMORY LOST, remove the battery holder and leave the 41CV unpowered for a few days then try again.  If still no joy, and you really did double-check your N cells' polarities, then the 41CV is in need of servicing.

 

Disclaimer: I don't work for HP. I'm just another happy HP calculator user.

-Joe-
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