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HP-41CX clock quirk



#4

I have an HP-41CX with a little strange little quirk in its clock. Whenever the batteries are changed the clock disappears from the system for a few minutes. SHIFT-ON just turns the system off. After about 1-5 minutes after the batteries have been inserted the clock starts working normally.

Note that if the batteries are re-inserted fairly quickly (say less than 30 seconds) the clock stays put, but it disappears long before a "MEMORY LOST" condition occurs.

Has anyone seen this behavior before or know of a cure?


#5

If any body else has this problem the cause was the 22 megohm resistor next to the crystal. It an open circuit.

I originally did not want to measure its value in circuit because my ohmmeter puts a fairly high voltage across its leads on the high-ohms range. When I finally unsoldered the resistor, it came apart into three pieces.

#6

David,

I am fairly sure that this is not a "quirk," meaning
"it's not a bug, it's a feature." When the BAT indicator
comes on, meaning that the batteries are low, you no longer
have access to the clock. It's still running, but the clock
uses a lot of continuous power, so they made it inaccessible
under a low battery condition.
Note also that if you display the clock, the calculator
will no longer automatically turn off after a while, so that
is a sure way to run down your battery.

Regards,

Ion Abraham
Albuquerque, New Mexico


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