Desk Calculator Manual
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• Steps continue to be accumulated in Calculation Memory until you 
press the 
A
 key or until 150 steps are accumulated, even if a 
finalize key is pressed.
• Review and GO TO can be used to view only the first 150 steps in 
Calculation Memory, even if there are more steps.
• Review and GO TO cannot be performed while an error indicator is 
displayed.
• Pressing the 
A
 key clears all steps from Calculation Memory and 
restarts the step count from 1.
3. Finalizing a Calculation
Finalizing a calculation means performing a key operation that 
produces a calculation result. Pressing any of the following keys 
finalizes a calculation: 
=
, 
&
.
4. Memory Clear Button
• Pressing the Memory Clear button on the back of the calculator 
deletes Calculation Memory contents, independent memory 
contents, tax rate settings (MJ-100D, MJ-120D), etc. Be sure to keep 
separate records of all important settings and numeric data to protect 
against accidental loss.
• Press the Memory Clear button to restore normal operation 
whenever the calculator does not operate correctly. If pressing the 
Memory Clear button does not restore normal operation, contact 
your original retailer or nearby dealer. 
5. Power Supply
Two-Way Power System provides power even in complete darkness. 
• Always have the battery replaced at your nearest dealer.
Auto power off: Approximately 6 minutes after last key operation.
6. Specifications
Power Supply: Two-Way Power System, with solar cell and one LR44 
button type battery
Battery Life: Approximately 3 years (1 hour operation per day)
Operating Temperature: 0˚C to 40˚C (32˚F to104˚F)










