EC-4040 (650-0806) Operation Faxback Doc. # 3473 Special Display Formats Note that special display formats are used for factional, hexadecimal, and sexagesimal (base 60) values. Fraction Display Format ON 456 12 23. Hexadecimal Display Format ON HEX ABCDEF 1 2 Sexagesimal Display Format ON 12 34 '56 . 78" In addition, there are a number of other special symbols that the calculator uses to represent certain operations inside of formulas. These are explained in details in other sections of this manual. Before assuming malfunction... If the calculator starts to produce strange or unexpected results, or if your calculations produce errors, you may be in the wrong mode. Use the following procedure to get the calculator back to its initial mode settings. 1. Press ALPHA Mci to clear all data currently stored in memory. 2. Press MODE symbol to enter the COMP Mode. 3. Press MODE MODE symbol to specify the DEG Mode. 4. Press MODE 5 1 to specify NORM 1. Next, specify the modes you need to perform your calculation and try again. Contrast Adjustment This calculator automatically sets the contrast to an easy-to view level. Use the following procedure if the display becomes difficult to read. 1. Press SHIFT MODE to display the contrast adjustment screen. 2. Press <- to make the display characters lighter, or -> to make them darker. 3. Press AC to complete the procedure. If the display remains dim even after you adjust the contrast, it may mean that battery power is low. Use the procedures listed under "To Replace Battery". If the display remains dim even after you adjust the contrast, it may mean that battery power is low. Use the procedures on page 14 to replace the battery as soon as possible. Power Supply This calculator is powered by a single G-13 Type (SR44 or LR44) battery. As battery power weakens, the characters on the display become dim and difficult to read (even after you adjust the contrast as described). When this happens, replace the battery as soon as possible. Important! Be sure to replace the battery at least once every 3 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, 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. Press SHIFT OFF to switch power off. 2. Remove the 7 screws that hold the back cover in place, and then push upward and pull out to remove the cover. 3. Remove the old battery by turning the battery compartment face down and lightly tapping the calculator. 4. 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). 5. Replace the back cover and secure it in place with the screw. 6. Press AC to switch power on. Note: The calculator automatically resets its memory whenever batteries are removed for longer than two or three minutes. The following are the initial settings of the calculator whenever its memory is reset. Function Input range Internal Accuracy Notes Results Total of integer, numerator and denominator must be within 10 digits Ab/c (includes division marks) As a rule, Input 12 digits accuracy is Results displayed +/-1 at the as a fraction for 10th digit. integer when integer, numerator and denominator are less than 1 x 10 10. Lxl < 1 x 10 50 SD lyl < 1 x 10 50 (LR) lnl < 1 x 10 100 xON, yON, x, y, " " A, B, r: n symbol O X ON-1, y ON-1: n symbol O, 1 Function Input range Values after variable within following range: DEC: - 2147483648 symbol x symbol 2147483647 BIN: 10000000000000000000000000000000 symbol x BASE-N symbol 11111111111111111111111111111111(negative) OCT: 20000000000 symbol x symbol 37777777777 (negative) 0 symbol x symbol 17777777777 (0, positive) HEX: 80000000 symbol x symbol FFFFFFFF (negative) 0 symbol x symbol 7FFFFFFF (0, positive) Errors may be cumulative with internal continuous calculations such as symbols sometimes affecting accuracy. (LB/all-12/15/94)