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HP-41CV



#2

Hi folks,
Can somebody help me with my old beloved calculator: After some seconds and after having made an operation it turns OFF. After turning it on again manually it still has all data on the stack, just as it was before.

Thanks

Clemente


#3

Is it possible that the automatic time-out number (that turns the machine off after a certain amount of inactivity)has been changed? Is that something the user has access to?


#4

It seems to be strange that this number may have been changed.

One way to test is to execute the ON function by typing XEQ "ALPHA" O N "ALPHA" which toggle the right flag (the purists will remember us that it is the # 44) and disable the auto-turn-off-after-a-certain-time feature.

Real synthetic programmer will toggle the 44 flag with special manipulation.

Fred


#5

Thanks Ellis and Fred

I will check out your recommendation during some hours and will come back to you.

Clemente


#6

Sorry, but although making XEQ "ALPHA" ON "ALPHA", the calculator is still turning off 3 - 10 seconds after making an operation.

Please help!!

Thanks

Clemente


#7

Hi;

just a hunch: have you opened the calculator and cleaned the BATT/IO assy contacts? If there is some sort of dirt, it is possible that the current drain in executing any internal program (i.e. executing a function) is enough to cause a voltage drop and switch the calculator off. Check, also, for the batteries' springs: they tend to get oxide residual from batteries leakage.

Hope it helps.

Cheers

#8

Yes.

The DS capacitor is probably blown.

I have a 41CV & performed the double speed mod. in 1984. When I did that the unit timed out 50% faster than usual- which I expected as the clock was running 2X faster.

I doubt you have don the modification, but if the ORIGINAL capcitor is blown, broken, or leaking , the exact problem you described will occur.

Try replacing it & see what happens. It should cost about 25 cents, plus some solder.

John K.


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