Calculated Industries 3420 User Guide - Manual (Page 76)

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Error Codes
With an incorrect entry or answer beyond the range of the calculator,
the display will show one of the following error messages. To clear
an error, simply press any key.
OFLO — Number Too Large to Display
DIV Error — Attempted to Divide by Zero
TVM Error — Time-Value-of-Money Error
ENT Error — Invalid Entry
PPY Error — Payments Per Year Error
QL Error — Qualifying Error
Auto Shut-Off
Your calculator is designed to shut itself off after about 8-12 minutes
of non-use.
Batteries
Should the display become very dim or erratic, replace the batteries.
Batteries Included: Two LR44 (1.5V) batteries
Battery-Life (Actual Use): 1,000 hours
Note: Please use caution when disposing of your old batteries, as they contain haz-
ardous chemicals.
Replacing the Batteries: Slide open and remove the battery door
(located on upper backside of calculator). Remove the old batteries.
Insert two new LR44 button-cell batteries, making sure they’re facing
positive-side (+) up. Close the battery door.
Note: Replacement batteries are available at most camera or electronics stores. You
may also call Calculated Industries at 1-775-885-4900.
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