EC-4041  (650-0820)              Power Source          Faxback Doc. # 3416

The DUAL POWER system makes it possible to operate calculators even in
complete darkness.

  This unit retains memory contents no matter what the light conditions.

  This unit uses two power sources: a solar cell, and a single G13 Type
  (SR44 or LR44) battery (Radio Shack Cat. No. 23-009).

  A weakened battery is indicated when the memory contents spontaneously
  clears or when the display darkens under poor light conditions and
  cannot be restored by pressing the ON key.

  To ensure proper operation, the battery should be replaced once every
  two years no matter how much the unit is used.

Important!

  Be sure to replace the battery at least once every two years, regardless
  of how much the calculator is used during that time.  An old battery may
  leak, seriously damaging the interior of the calculator.

  The battery that comes installed in the calculator when you purchase it
  is for factory test purposes, and so it may not provide a full service
  life.

  All data stored in the memory of the calculator is lost when you replace
  the battery.  Be sure to make a note of any important data before you
  replace the battery.

To Replace Batteries

1.  Remove the screws that hold the back cover in place, and then remove
    the cover.

2.  Remove the old battery by turning the battery compartment face down
    and lightly tapping the calculator.

3.  Wipe off the surfaces of a new battery with a soft, dry cloth, and
    install the battery with its positive (+) side facing up (so you can
    see it).

4.  Replace the back cover and secure it in place with the screws.

Important!

If you allow battery power to drop too low, memory contents may become
corrupted or lost completely.  Be sure to replace the battery as soon
as you notice the display becoming dim.

  Keep batteries out of the reach of small children.  If swallowed,
  consult with your physician immediately.

Never try to charge the batteries, take them apart, or allow them to
become shorted.  Keep batteries away from flame and direct heat at all
times.

Auto Power Off function

This unit automatically switches off if no operation is performed for
approximately 6 minutes.  Power can be restored by pressing the ON key.
Memory contents and mode settings are retained even when power is switched
off.

(LB/all-12/05/94)