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Jeff Miller
JM Electronics
Good quality service manual German user manual. German user manual This is a quality scan of a manual in excellent condition and is just as good as having the original manual in hand
Text excerpt from page 12 (click to view)
To replace the memory back up battery 1 Switch the power of the calculator off. 2 Slide the battery compartment cover on the back of the unit in the direction indicated by the arrow. 3 Remove screw B from the battery holder. 4 Remove the old battery. 5 Wipe off the surfaces of a new battery with a soft, dry cloth. Load it into the calculator so that its positive + side is facing up. 6 Replace the battery holder and fasten it in place with screw B. 7 Replace the battery compartment cover, sliding in the direction opposite that indicated by the arrow. 8 Switch the power of the calculator on and check for proper operation. Battery holder Screw B
[Important] * Do not remove the main power supply and the memory back up batteries from the unit at the same time. * If you should remove the main power supply and the memory back up batteries, you must then perform the all reset operation after you reload batteries. * Replace the memory back up battery at least once every year, regardless of how much you use the calculator during that time.
s About the Auto Power Off Function The calculator switches power off automatically if you do not perform any key operation for about 6 minutes. To restore power, press AC/ON on.