EC-4043  (650-0807)         Error Conditions           Faxback Doc. # 3443

When an error condition occurs, Error appears in the display.  The
calculator will not accept a keyboard entry until you press CE/C to
clear the error condition.  (Pressing CE/C CE/C clears the condition and
all pending operations.)

General Error Conditions

The error conditions listed in this section can occur in most calculator
modes.  Errors occur when you attempt to:

  Perform a calculation that results in an answer larger than
  +/-9.999999999 x 10 symbol.

  Divide a number by zero.

  Use more than 15 levels of open parentheses or more than four pending
  operations.  (You can use only one pending operation in the statistics
  mode.)

  Calculate log, In, or 1/x of zero.

  Calculate log, In, or Symbol of a negative number.

  Find an even root of a negative number.

  Raise zero to the 0th power or calculate the 0th root of any number.

  Convert rectangular to polar when x or y has an exponent > 63.

  Calculate tan of 90 degrees or 270 degrees 100 or 300 grads, or their
  rotational multiples, such as 450 degrees.

  Calculate sin -1 or cos -1 of a number whose absolute value is greater
  than 1.

  Calculate tanh-1 of a number whose absolute value is greater than or
  equal to 1.

  Calculate x! of a number that is not a positive integer less than or
  equal to 69.

  Calculate combinations or permutations when n or r are not positive
  integers.


Statistical Error Conditions

The error conditions listed in this section occur only when the calculator
is in the statistics mode.  Errors occur when you attempt to:

  Enter a data value (x) such that (x) Symbol 1x10 symbol.

  Remove a data value when it is the only value in the statistical
  registers, or when there are no data values in the registers.

  Calculate Symbol, symbol, Oxn, Oyn, Oxn-1, Oyn-1, correlation,
  intercept, slope, x1, or y1 when there are no data values.

  Calculate a two-variable statistic when you are in the STAT 1 mode.

  Calculate Oxn-1 with only one data value.

  Calculate the correlation of x' of a horizontal line.

  Calculate correlation, slope, intercept, x, or y' with only one data
   pair entered.

Number-Mode Error Conditions

Errors occur when you attempt to:

  Calculate a result that is outside the calculator's range for the
  current mode.

  Select BIN, OCT, or HEX when the displayed number is outside the
  calculator's range for the selected mode.


In case of Difficulty

1.  If the digits fail to appear in the display, be sure that all if the
    solar panel is exposed to an adequate light source.

2.  Press AC/On to reset the calculator.  Then try the calculation again.
    Review the operation instructions to be certain the calculations
    were performed properly.

(LB/all-12/05/94)