HP-41CV - problems



#9

I received my recent acquisition - one old HP-41CV - but, connecting the batteries it didn't work at all.
I've checked the batteries contacts and could see problems on them. I fixed that. Tryed again - nothing. So, I get the back off and wired to the main circuit board an external 6V batteries.
When I insert the last battery, the display gets on with the message MEMORY LOST, or only LOST, or some symbols and the keyboard completely locked.
Is this calculator dead?
Please , HEEEEEEELLLLP!!!!!!


#10

I have been using this calculator for 20 years and I have never had a problem.

When I turned it on this morning, the decimal has been replaced with a comma. I believe that it is in the Euorpean Mode. However, I don't know how to change it back to the decimal Decimal Mode.

Can anyone help?

Everything seems to be working properly, except my decimal has been replaced by this frustrating comma.


#11

Please take a look at the user flags...because this is really RTFM.

SF 28 does the job.

#12

Try with pressing and holding the ENTER key, then press and release the ON key, then release the ENTER key.
This is a reset (also RTFM;-)


#13

I'll try the ENTER-ON-ENTER.
Thanks, Raymond!
Artur

#14

Hi, Artur; (tudo certo?)

Have you checked if yours is a fullnut or a halfnut? Look at the image below:

Raymond's comments are very important. A simple reset may solve the problem. What worries me is the already exisiting [MEMORY LOST] message and the fact it is broken and shows unusual characters.

If your 41CV is a fullnut (earlier, "original" HP41 display), chances are you have a common bad contact between the small mainboard and the keyboard contacts. In most cases, a simple cleanning procedure is enough.

Tell us (ou me manda um e-mail) if you need extra advice.

Success.

Luiz (Brazil)


#15

This one is the fullnut (without the rounded corners) and the CPU board is not model with NO transistors.

Artur

(Luiz, I've sent you an email)


#16

Lift the CPU board off the posts, gently remove the zebra strip connectors. Clean everything with 91% isopropyl alcohol. Reassemble. Pray to your favorite diety. Turn on. Hopefully enjoy.


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