Casio CFX9800G Service Manual

CFX-9800G(LX-392AA)

INDEX

MAR. 1995

(without price)

CONTENTS

1. SCHEMATIC DIAGRAM

1-1. Main PCB ................................................................................................. 1

1-2. Power Supply and Key Block ................................................................ 2

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

3. GENERAL GUIDE ........................................................................................... 4

3-1. Modes....................................................................................................... 4

3-2. About Display Colors ............................................................................. 5

3-3. Color Contrast Adjustment .................................................................... 5

3-4. About Low Battery Warning................................................................... 6

4. REPLACING BATTERIES............................................................................... 6

4-1. To Replace the Main Power Supply Batteries ...................................... 7

4-2. To Replace the Memory Back Up Battery............................................. 8

5. RESET OPERATION....................................................................................... 8

6. WELDING CONDITION FOR THE CERAMIC OSCILLATOR

(CSTC4.30MG-TC) ................................................ 10

7. ERROR MESSAGE ....................................................................................... 10

8. OPERATION CHECK .................................................................................... 12

9. COLOR ADJUSTMENT ON OPERATION CHECK ...................................... 14

10. DATA TRANSFER CHECK........................................................................... 16

11. DATA COMMUNICATIONS .......................................................................... 17

11-1. Connecting Two CFX-9800G Units.................................................... 17

11-2. Before Starting Data Communications ............................................. 17

11-3. Setting Communications Parameters ............................................... 18

11-4. Using ALL, Range, and Factor........................................................... 19

11-5. Data Communications Precautions .................................................. 20

12. PIN FUNCTION

12-1. CPU (HD62119A02) ............................................................................. 21

12-2. ROM (MB834000CPF-G-4EP) ............................................................. 22

12-3. RAM (256RAM/3V)............................................................................... 22

13. TROUBLESHOOTING................................................................................... 23

14. DISASSEMBLY AND EXPLODED VIEW ..................................................... 24

15. PARTS LIST ................................................................................................. .28

1. SCHEMATIC DIAGRAM

1-1. Main PCB

NOTES

1. The terminals with mark are the checking points for the power supply.

2. The terminals with mark are the checking points for the function.

3. LSI5 and C14 are not used.

— 1 —

1-2. Power Supply and Key Block

— 2 —

2. SPECIFICATIONS

Display system: Three colors (orange, blue, green); 16-character × 8-line liquid crystal

display; 10-digit mantissa and 2-digit exponent for calculations; displays binary, octal, hexadecimal, sexagesimal values, fraction, complex number

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

Memory protection: One CR2032 lithium battery

Power consumption: 0.1W Battery life*: Main: Approximately 120 hours (continuous display of initial screen.) with

battery type LR03 (AM4) Approximately 80 hours (continuous display of initial screen.) with battery type R03 (UM-4) Approximately 2 years (power switch off) with LR03 (AM4)/R03

(UM-4) Memory protection: 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 switched off approximately six minutes after last

operation except when drawing dynamic graphs.

Ambient temperature range: 0°C ~ 40°C (32°F ~ 104°F) Dimensions: 17.4mm H × 95.5mm W × 182.5mm D ( 5/8" H × 33/4" W × 71/8" D) Weight: 200g (7.1 oz) including batteries Accessories: Hard case

Current Consumption

TYP [µA] MAX [µA] ON (MENU) 4610 5530 OFF 15

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3. GENERAL GUIDE

3-1. Modes

You can control the operations of the unit by entering the correct mode. To select the mode you need, select the appropriate icon from the Main Menu. The Main Menu appears whenever you press the

The icon that is highlighted is the one that is currently selected. Use the cursor keys to move the highlighting around the display to select the mode that you want. To enter the highlighted mode, press the

• In addition to using the cursor keys to select a mode's icon, you can also select a mode by input-

ting a number or letter. Input the number or letter in the lower right corner of the icon to select the mode you want.

• Use only the procedures described above to enter a mode. If you use any other procedure, you

may end up in a mode that is different than the one you thought you selected.

EXE

key.

The following explains the meaning of each icon in the Main Menu.

COMP Mode

Use this mode for arithmetic calculations and function calculations, for drawing graphs and for executing programs.

BASE Mode

Use this mode for binary, octal, decimal, and hexadecimal calculations and conversions. This mode is also used for logical operations.

SD Mode

Use this mode for single-variable statistical calculations (standard deviation), and for drawing normal distribution and single-variable statistical graphs.

REG Mode

Use this mode for paired-variable statistical calculations (regression), and for drawing paired-variable statistical graphs.

MAT Mode

Use this mode for matrix calculations.

GRAPH Mode

Use this mode to input functions and draw their graphs.

DYNA Mode

Use this mode to store graph functions and to draw graphs by changing the values for variables in the functions.

— 4 —

TABLE Mode

Use this mode to store a function or recursion formula, to generate a solution table of values produced when the values of variables in a function or recursion formula change, and to draw graphs.

EQUA Mode

Use this mode to solve linear equations with two through six unknowns, quadratic equations, and cubic equations.

PRGM Mode

Use this mode to store programs in the program area, to execute programs, and to store and execute programs as file data.

LINK Mode

Use this mode to transfer program, function, matrix, and other memory data to another unit.

OPTION Mode

Use this mode to adjust the color contrast of the display and to reset the calculator to its initial settings.

3-2. About Display Colors

The calculator can display data in three colors: orange, blue, and green. The default color for graph drawing and comment text accompanying a graph or program execution operation is blue, but you can use the following procedure to change the color to orange or green if you want.

1. Display the Graph Color Menu.

SHIFT

COLOR

(Orn)..Orange graph and comment text

(Grn)..Green graph and comment text

2. Press the function key that correspond to the color you want to specify for graph drawing and

comment text, and then input the text.

3. Execute the function or run the program to display the graph and comment text in the color you

specify.

Orn Grn

F1 F2

3-3. Color Contrast Adjustment

Highlight the OPTION icon on the Main menu and then press

EXE

OPTION

COLOR CONTRAST

RESET

TO SELECT: [ ↓ ][ ↑ ] TO SET : [EXE]

— 5 —

EXE

COLOR

O B G

ORANGE

BLUE

GREEN

– +

CONTRAST

INIT IN·A

(INIT). Returns tint to default setting.

(IN·A). Returns tint and contrast to default setting.

• To adjust the contrast

1. Use and to move the pointer to CONTRAST.

2. Use to make the figures on the display darker or to make them lighter.

3. Press

• To adjust the tint

1. Use and to move the pointer to the color you want to adjust (ORANGE, BLUE,

GREEN).

2. Use to move the setting toward the G (green) side or to move it to the O (orange) side.

3. Press

• When adjusting the color contrast, first adjust overall display contrast, and then adjust the tint of

each individual color.

• You can also adjust the overall contrast whenever any other screen is shown on the display by

pressing

to return to the Main Menu.

SHIFT

and then or . Press

SHIFT

again to exit the contrast adjustment procedure.

F1 F2

3-4. About Low Battery Warning

If the following message appears on the display, immediately stop using the calculator and replace batteries.

✽✽ Low battery! ✽✽

If you try to continue using the calculator, it will automatically switch power off, in order to protect memory contents. You will not be able to switch power back on until you replace batteries.

Be sure to replace batteries at least once every two years, no matter how much you use the calculator during that time.

4.REPLACING BATTERIES

Warning!

If you remove both the main power supply and the memory back up batteries at the same time, all memory contents will be erased.

— 6 —

Precautions:

Incorrectly using batteries can cause them to burst or leak, possibly damaging the interior of the unit. Note the following precautions:

• Be sure that the positive + and negative - poles of each battery are facing in the proper direc-

tions.

• Never mix batteries of different types.

• Never mix old batteries and new ones.

• Never leave dead batteries in the battery compartment.

• Remove the batteries if you do not plan to use the unit for long periods.

• Never try to recharge the batteries supplied with the unit.

• Do not expose batteries to direct heat, let them become shorted, or try to take them apart.

4-1. To Replace the Main Power Supply Batteries

* 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 switch 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. 1 Switch the power of the calculator off, and slide the calcula-

tor into its hard case.

2 Remove screw A on the back of the calculator, and remove

the main battery compartment cover.

3 Remove the two old batteries. 4 Load a new set of two batteries, making sure that their

positive + and negative - ends are facing in the proper directions.

5 Insert the tabs of the main battery compartment cover into

the slots in the back of the calculator and replace the cover. Secure it in place with the screw.

• Power will not switch on if you press

AC/

while the main

power supply battery compartment cover is open.

6 Remove the calculator from its hard case and press

AC/

switch power on.

• Power supplied by memory back-up batteries while the

main power supply batteries are removed retains memory contents.

• Do not leave the unit without main power supply batteries

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

Screw A

— 7 —

4-2. To Replace the Memory Back Up Battery

OPTION

TO SELECT: [ ↓ ][ ↑ ] TO SET : [EXE]

COLOR CONTRAST

RESET

* Before replacing the memory backup battery, switch 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.

* 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.

* 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.

1 Switch the power of the calculator off. 2 Remove screw B on the back of the calculator, and remove

the back-up battery compartment cover.

3 Remove the old battery. 4 Wipe 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.

5 Insert the tabs of the back-up battery compartment cover

into the slots in the back of the calculator and replace the cover. Secure it in place with the screw.

Screw B

6 Switch the power of the calculator on and check for proper

operation.

5. 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.

You should perform the RESET operation whenever you want to initialize 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

1 Switch the power of the calculator on. 2 Press

to display the Main Menu.

3 Use the cursor keys to select the OPTION icon and

then press the Main Menu is displayed.

EXE

. Or you can simply press

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while

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