Calculated Industries 4020 - Manual (Page 32)

P
OCKET
R
EFERENCE
G
UIDE
— 28
Replacing the Batteries
To replace the batteries, slide open the
battery door (at top backside of unit) and
replace with new batteries. Make sure the
batteries are facing positive side up.
Reset
If your calculator should ever “lock up,”
press Reset — a small hole located above
the
l key — to perform a total reset.