Casio Fx-7400G Fehlerbehebungshandbuch

fx-7400G(ZX-930A)

MAR. 1996

(without price)

fx-7400G

INDEX

CONTENTS

1. SCHEMATIC DIAGRAMS ..................................................................................1

2. SPECIFICATIONS............................................................................................. 3

3. REPLACING BATTERIES..................................................................................4

4. RESET OPERATION..........................................................................................6

5. ERROR MESSAGE ............................................................................................8

6. OPERATION CHECK .......................................................................................10

7. EXPLODED VIEW ............................................................................................12

8. PARTS LIST .....................................................................................................13

— 1 —

1. SCHEMATIC DIAGRAMS

— 2 —

— 3 —

2. SPECIFICATIONS

Display system: 13-character ×6-line display; 10-digit mantissa and 9-digit mantissa and 2-

digit exponent when using exponential format for calculations; displays

sexagesimal, fraction values

Power supply: Main: Two AAA-size batteries (LR03 (AM4) or R03 (UM-4))

Back-up: One CR2032 lithium battery

Power consumption: 0.05 W

Battery life*: LR03 (AM4): Approximately2,000hours(continuousdisplayofmainmenu)

Approximately 2 years (power off)

R03 (UM-4): Approximately1,000hours(continuousdisplayofmainmenu)

Approximately 2 years (poweroff)

Back-up: Approximately 2 years

* The batteries that have been installed in this unit when user purchased

it had been used in the factory test, so it will be impossible to fully satisfy

this specifications when these batteries are used.

Auto power off: Power is automatically turned off approximately six minutes after last

operation.

Ambient temperature range: 0°C ~ 40°C (32°F ~ 104°F)

Dimensions: 18.9 mm (H) ×77 mm (W) ×158 mm (D) (3/4" (H) ×3" (W) ×61/4" (D))

Weight: 130 g (4.6 oz) including batteries

Accessories: Hard case

Current Consumption:

TYP [µA] MAX [µA]

ON (MENU) 317.4 425.7

OFF 15.4

— 4 —

3. REPLACING BATTERIES

• To replace the main power supply batteries

1Press

SHIFT

OFF

to turn the calculator off.

2Push the battery compartment cover on the back of the calculator

in the direction noted in the illustration and remove it.

3Remove the two old batteries.

4Load a new set of two batteries, making sure that their positive+

and negative -ends are facing in the proper directions.

5Replace the battery compartment cover and press

AC/ON

to turn

power on. The memory back-up battery provides power to the

memory while the main batteries are removed, so memory data

is not lost .

• Power will not switch on if you press

AC/ON

while the main power

supply battery compartment cover is open.

• Do not leave the unit without main power supply batteries loaded

for long periods. Doing so can cause deletion of data stored in

memory.

• If the figures on the display appear too light and hard to see after

you turn on power, adjust the contrast using the following

procedure.

1. Press

2. Use the cursor keys ( , , , ) to select the CONT icon and press

EXE

or simply

press 7to display the contrast adjustment screen.

3. Press to make the figure on the screen lighter or to make them darker.

4. After getting the contrast the way you want it, press

to return to the main menu.

REMARK

* Never remove the main power supply and the memory back up batteries from the unit at the same time.

* Be sure to switch the unit off before replacing batteries. Replacing batteries with power on will cause

data in memory to be deleted.

* Never replace the main power supply battery compartment cover or turn the calculator on while the

main power supply batteries are removed from the calculator or not loaded correctly. Doing so can

cause memory data to be deleted and malfunction of the calculator. If mishandling of batteries causes

such problems, correctly load batteries and then perform the RESET operation to resume normal

operation.

* Be sure to replace all two batteries with new ones.

— 5 —

• To replace the memory back up battery

1Press

SHIFT

OFF

to turn the calculator off.

2Push the battery compartment cover on the

back of the calculator in the direction noted in

the illustration and remove it.

3Remove screw Don the back of the calculator,

and remove the back up battery holder.

4Remove the old battery.

5Wipe off the surfaces of a new battery with a

soft, dry cloth. Load it into the calculator so that

its positive +side is facing up.

6Pressing down on the battery with the battery

holder, replace the screw that secures the

holder in place.

7Replace the battery compartment cover and

press

AC/ON

to turn power on. The main battery

provides power to the memory while the back-

up batteries are removed, so memory data is

not lost.

REMARK

* Before replacing the memory back up battery, turn on the unit and check to see if the "Low battery!"

message appears on the display. If it does, replace the main power supply batteries before replacing

the back up power supply battery.

* Neverremove themain powersupply and thememory backup batteriesfrom theunit at thesame time.

* Be sure to switch the unit off before replacing batteries. Replacing batteries with power on will cause

data in memory to be deleted.

* Be sure to replace the back up power supply battery at least once 2 years, regardless of how much

you use the unit during that time. Failure to do so can cause data in memory to be deleted.

Important

Data stored in memory can be corrupted or lost if battery power drops below a certain level. When this

happens, you must perform the RESET operation to restore normal operarion. Note that the RESET

operation clears all data from memory. Because of this, you should be sure to keep written copies of

all important data to avoid losing it due to low battery power.

— 6 —

Memory

Memory Usage

Reset

Select

Set :

:[ ] [ ]

[ EXE ]

✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽

✽ ✽

✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽

R E S E T

A L L M E M O R I E S ?

Y E S NO

RESET ALL

4.RESET OPERATION

Warning!

The procedure described here clears all memory contents. Never perform this operation unless you

want to totally clear the memory of the calculator. If you need the data currently stored in memory, be

sure to write it down somewhere before performing the RESET operation.

•To reset the calculator

1Press

to display the Main menu.

2Highlight the MEM icon and press

EXE

, or press 8.

3Use to move the highlighting down to "Reset" and then press

EXE

4Press F1 (YES) to reset the calculator or F4 (NO) to abort the operation without resetting

anything.

F4F1

✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽

R E S E T

A L L M E M O R I E S !

— 7 —

Resetting the calculator initializes it to the following settings.

Initial Setting

RUN

Rad

Norm 1

Automatic

Display

Rectangular coordinate (Y=)

Automatic

Clear

Clear (initialized)

Clear

Clear (initialized)

Clear

Item

Icon

Angle Unit

Exponent Display Range

Fraction Reduction

Mixed Fraction

Graph Type

Statistical Graph

Variable Memory

Answer Memory (Ans)

Graphic Display/Text Display

View Window

View Window Memory

Graph Function

Enlargement/Reduction Factor

Table & Graph Data

List Data

Statistical Calculation/Graph Memory

Program

Input Buffer/AC Replay

• Performing the RESET operation while an internal calculation is being performed (indicated by a blank

display) will cause all data in memory to be deleted. Make sure that no calculation be being performed

before starting a RESET operation.

• If the calculator stops operating correctly for some

reason, use a thin, pointed object to press the

RESET button on the back of the calculator. This

should make the RESET confirmation screen

appear on the display. Perform the procedure to

complete the RESET operation.

RESET button

— 8 —

5. ERROR MESSAGE

Meaning

1Calculation formula contains an error.

2Formula in a program contains an

error.

1Calculation result exceeds calcula-

tion range.

2Calculation is outside the input range

of a function.

3Illogical operation (division by zero,

etc.)

4Poor precision in differential calcula-

tion results.

1No corresponding Lbl nfor Goto n.

2No program stored in program area

Prog “file name”.

3No corresponding “Next” for “For”, no

corresponding “LpWhile” for “Do”, or

no corresponding “whileEnd” for

“While”.

• Nesting of subroutines exceeds 10

levels.

• Execution of calculations that exceed

the capacity of the stack for numeric

values or stack for commands.

Message

Syn ERROR

Ma ERROR

Go ERROR

Ne ERROR

Stk ERROR

Countermeasure

1Use or to display the point

where the error was generated and

correct it.

2Use or to display the point

where the error was generated and

then correct the program.

123

Check the input numeric value and

correct it.

When using memories, check that the

numeric values stored in memories

are correct.

4Try using a smaller value for ∆x

(xincrement/decrement).

1Correctly input a Lbl ntocorrespond to

the Goto n, or delete the Goto nif not

required.

2Store a program in program area Prog

“file name”, or delete the Prog “file

name” if not required.

3Correctly match “Next” with “For”,

“LpWhile” with “Do”, or “whileEnd”

with “While”.

• Ensure that Prog “file name” is not

used to return from subroutines to

main routine. If used, delete any un-

necessary Prog “file name”.

• Trace the subroutine jump destina-

tions and ensure that no jumps are

made back to the original program

area. Ensure that returns are made

correctly.

• Simplify the formulas to keep stacks

within 10 levels for the numeric values

and 26 levels for the commands.

• Divide the formula into two or more

parts.

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