EC-4027  (650-0999)              Operation             Faxback Doc. # 3487

HOW TO PROCEED IF ABNORMAL CONDITIONS OCCUR

If this calculator is subjected to strong external noise or shock during
use, a rare condition may occur in which all the keys, including the
ON/C key, do not function.  In this case, press the RESET switch on the
back of the calculator.  Note that the memory contents will be completely
cleared when this operation is performed.

  Press the RESET switch only in the following cases:

  After replacing the batteries
  To clear all memory contents
  When an abnormal conditions occurs and all keys are inoperative.

Battery Replacement

Batteries Used

Alkaline-manganese battery (LR44 Radio Shack Cat. No. 23-115) x 2

Notes on Battery Replacement

Batteries that are not properly handled can leak and damage the
calculator.  For this reason, pay particular attention to the following
points.

  Be sure to turn the power off when replacing batteries.

  Replace both batteries at the same time.

  Do not mix new and used batteries.

  Use the same type of batteries.

  When installing, orient each battery properly according to the +
  markings as indicated in the calculator.

  Keep the batteries out of the reach of children.

  Since the original batteries were factory-installed before shipment,
  they may require replacement before the continuous operating time
  indicated in the specifications is reached.

  Exhausted batteries left in the calculator may leak and damage the
  calculator.

  Do not throw the batteries into a fire, as they may explode.

When to Replace Batteries

If the display becomes difficult to read, the batteries require
replacement.  Immediately change them by following the procedure below.

Replacement Procedure

1.  Turn the power off by pressing the OFF key.

2.  Remove the two screws on the back and remove the back cover.

3.  Remove the used batteries by prying them with a ball-point pen or
    other similar pointed device.

4.  Install two new batteries with their positive sides facing up.

5.  Replace the back cover.

6.  Press the RESET switch, located on the back of the calculator.

Make sure that the indicator" DEG 0." appears on the display.  If the
display shows something other than "DEG 0.", or nothing at all, repeat
steps 1 to 6.

Auto Power Off Function

If no key is pressed for approximately 10 minutes, the calculator will
automatically turn off to save battery power.

(LB/all-12/08/94)