Casio CFX-9850G PLUS Troubleshooting guide

R
MAY. 1997
CFX-9850G PLUS
(without price)
CFX-9850G PLUS(ZX-935A)

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CONTENTS
1. SPECIFICATIONS ........................................................................................... 3
2. GENERAL GUIDE
2-1. Modes....................................................................................................... 4
2-2. Color Contrast Adjustment .................................................................... 5
2-3. Power Supply .......................................................................................... 6
3. RESET OPERATION....................................................................................... 9
4. DATA COMMUNICATIONS
4-1. Connecting Two Units .......................................................................... 10
4-2. Before Starting Data Communications ............................................... 10
4-3. Performing Data Transfer Operation................................................... 11
4-4. To Send the Screen .............................................................................. 14
4-5. Data Communication Precautions ...................................................... 15
5. OPERATION CHECK .................................................................................... 16
6. DATA TRANSFER CHECK........................................................................... 19
7. PIN FUNCTION.............................................................................................. 20
8. TROUBLESHOOTING................................................................................... 21
9. OPERATION PROBLEMS ............................................................................ 22
10. ERROR MESSAGE ....................................................................................... 23
11. SCHEMATIC DIAGRAMS ............................................................................. 25
12. PARTS LIST .................................................................................................. 28
13. EXPLODED VIEW ......................................................................................... 29

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Variables: 28
Text display:
±1 ×10–99 to ±9.999999999 ×1099 and 0. Internal operations use 15-digit mantissa.
Exponential display range: Norm1: 10–2 > [x], [x] > 1010
Norm2: 10–9 > [x], [x] > 1010
Program capacity: 28 kbytes (max.)
Power supply:
Main: Four AAA-size batteries (LR03(AM4) or R03 (UM-4))
Back-up: One CR2032 lithium battery
Power consumption: 0.06 W
Battery life*:
Main:
LR03(AM4): Approximately 240 hours (continuous display of main menu)
Approximately 2 years (power off)
R03(UM-4): Approximately 150 hours (continuous display of main menu)
Approximately 2 years (power off)
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 except when drawing dynamic
graphs.
The calculator automatically turns off if it is left for about 60 minutes with a calculation stopped by an output
command ( ), which is indicated by the “-Disp-” message on the display.
Ambient temperature range: 0 °C ~ 40 °C
Dimensions: 19.7 mm H ×83 mm W ×175.5 mm D (3/4" H ×3 1/4" W ×67/8" D)
Weight: 190 g (including batteries)
Current consumption:
TYP [µA] MAX [µA]
ON (MENU) 2416 2852
OFF 17.1
==
==
1. SPECIFICATIONS

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Icon Mode Name Description
RUN Use this mode for arithmetic calculations and function calculations,
and for calculations involving binary, octal, decimal and hexadeci-
mal values.
STATistics Use this mode to perform single-variable (standard deviation) and
paired-variable (regression) statistical calculations, to perform tests,
to analyze data and to draw statistical graphs.
MATrix Use this mode for storing and editing matrices.
LIST Use this mode for storing and editing numeric data.
GRAPH Use this mode to store graph functions and to draw graphs using the
functions.
DYNAmic graph Use this mode to store graph functions and to draw multiple versions
of a graph by changing the values assigned to the variables in a
function.
2-1. Modes
• To select an icon
1. Press
MENU
to display the Main Menu.
2. Use the cursor keys ( , , , ) to move the highlighting to the icon you want.
3. Press
EXE
to display the initial screen of the mode whose icon you selected.
• You can also enter a mode without highlighting an icon in the Main Menu by inputting the number or letter
marked in the lower right corner of the icon.
• 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.
The following explains the meaning of each icon.
MENU
Currently selected icon
2. GENERAL GUIDE

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Icon Mode Name Description
TABLE Use this mode to store functions, to generate a numeric table of
different solutions as the values assigned to variables in a function
change, and to draw graphs.
RECURsion Use this mode to store recursion formulas, to generate a numeric
table of different solutions as the values assigned to variables in a
function change, and to draw graphs.
CONICS Use this mode to draw graphs of implicit functions.
EQUAtion Use this mode to solve linear equations with two through six
unknowns, quadratic equations, and cubic equations.
PRoGraM Use this mode to store programs in the program area and to run
programs.
Time Value of Use thismodeto perform financial calculationsandto draw cashflow
Money and other types of graphs.
LINK Use this mode to transfer memory contents or back-up data to
another unit.
CONTrast Use this mode to adjust the color contrast of the display.
MEMory Use this mode to check how much memory is used and remaining,
to delete data from memory, and to initialize (reset) the calculator.
2-2. Color Contrast Adjustment
Adjust the color whenever objects on the display appear dim or difficult to see. There are two different settings
you can make to get color the way you want it.
• Color contrast
• Tint adjustment for each color
• To display the color adjustment screen
Highlight the CONT icon in the Main Menu and then press
EXE
.
•{INIT}/{IN•A} ... {initialize highlighted color}/{initialize all colors}
Use the following procedures while the color adjustment screen is on
the display to adjust the color contrast and tint settings.
COLOR
,,,
,,,
O B G
ORANGE
BLUE
GREEN
CONTRAST
INIT IN·A
– +

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2-3. Power Supply
This unit is powered by four AAA-size (LR03(AM4) or R03(UM-4)) batteries. In addition, it uses a single
CR2032 lithium battery as a back up power supply for the memory.
If the following message appears on the display, immediately stop using the calculator and replace batteries.
If you try to continue using the calculator, it will automatically turn power off, in order to protect memory
contents. You will not be able to turn power back on until you replace batteries.
Be sure to replace the main batteries at least once every two years, no matter how much you use the calculator
during that time.
• To adjust the color contrast
1. Use the cursor and keys to move the pointer so it is next to CONTRAST.
2. Press the cursor key to make the display darker and the cursor key to make it lighter. Holding
down either key changes the setting at high speed.
• To adjust the color tint
1. Use the cursor and keys to move the pointer so it is next to the color (ORANGE, BLUE, GREEN)
whose tint you want to adjust.
2. Press the cursor key to givethecolor greener tint andthe cursor key to giveitan orange tint. Holding
down either key changes the setting at high speed.
• To exit the color adjustment screen
Press
MENU
to return to the Main Menu.
• It is recommended that you always adjust the CONTRAST setting first, and then adjust the tint settings
for individual colors.
• You can change the CONTRAST setting at any time without displaying the color adjustment screen.
Simply press
SHIFT
and then or to change the setting. Press
SHIFT
once again after get the display
looking the way you want.
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. If you do remove both batteries, correctly reload them and then perform the reset
operation.
Replacing Batteries
Precautions:
Incorrectly using batteries can cause them to burst or leak, possibly damaging the interior of the unit. Note the
following precautions:

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• 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.
* 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 four batteries with new ones.
1. Press
SHIFT OFF
to turn the calculator off.
Warning!
* Be sure to turn the unit off before replacing batteries. Replacing batteries with power on will cause data
in memory to be deleted.
2. Making sure that you do not accidently press the
AC/ON
key, slide the case onto the calculator and then turn
the calculator over.
3. Remove the back cover from the calculator by pressing it in the direction
indicated by arrow 1, and then sliding it in the direction indicated by arrow 2.
4. Remove the four old batteries.
5. Load a new set of four batteries, making sure that their positive +and negative
-ends are facing in the proper directions.
6. Replace the back cover.
7. Turn the calculator front side up and slide off its case. Next press
AC/ON
to turn on
power.
1
2
P
P
MAIN
• Be sure that the positive +and negative -poles of each battery are facing
in the proper directions.
• 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.
(Should a battery leak, clean out the battery compartment of the unit
immediately, taking care to avoid letting the battery fluid come into direct contact with your skin.)
Keep batteries out of the reach of small children. If swallowed, consult with a physician immediately.

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• Power supplied by memory back up battery while the main power supply batteries are removed for
replacement 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.
• If the figures on the display appear too light and hard to see after you turn on power, adjust the tint.
• To replace the memory back up battery
* 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.
* Never remove the main power supply and the memory back up batteries from the unit at the same time.
* 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. Press
SHIFT OFF
to turn the calculator off.
Warning!
* Be sure to turn the unit off before replacing batteries. Replacing batteries with power on will cause data
in memory to be deleted.
2. Making sure that you do not accidently press the
AC/ON
key, slide the case onto the calculator and then turn
the calculator over.
3. Remove the back cover from the calculator by pressing it in the direction indicated
by arrow 1, and then sliding it in the direction indicated by arrow 2.
4. Remove screw Aon the back of the calculator, and remove the back up battery
compartment cover.
5. Remove the old battery.
6. 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.
7. Install the memory protection battery cover onto the calculator and secure it in
place with the screw. Next, replace the back cover.
8. Turn the calculator front side up and slide off its case. Next press
AC/ON
to turn on
power.
About the Auto Power Off Function
The calculator turns power off automatically if you do not perform any key operation
for about 6 minutes. To restore power, press
AC/ON
.
P
P
P
MAIN
MAIN
1
2
A

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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
1. Highlight the MEM icon on the main menu and then press
EXE
, or press
tan
F.
2. Use to move the highlighting down to “RESET” and then press
EXE
.
3. Press F1 (YES) to reset the calculator or F6 (NO) to abort the operation without resetting anything.
4. Press
MENU
.
• If the display appears too dark or dim after you reset the calculator, adjust the tint.
• If the calculator stops operating correctly for some reason, use a thin, pointed
object to press the P button on the back of the calculator. This should make the
RESET screen appear on the display. Perform the procedure to complete the
RESET operation.
• Pressing the P button while an internal calculation is being performed will cause
all data in memory to be deleted.
F1 F6
P button
3. RESET OPERATION

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4-1. Connecting Two Units
The following procedure describes how to connect two units with an optional SB-62 connecting cable for
transfer of programs between them.
To connect two units
1. Check to make sure that the power of both units is off.
2. Remove the covers from the connectors of the two units.
• Be sure you keep the connector covers in a safe place so you can replace them after you finish your data
communications.
3. Connect the two units using the SB-62 cable.
SB-62 cable
• Keep the connectors covered when you are not using them.
4-2. Before Starting Data Communications
In the Main Menu, select the LINK icon and enter the LINK Mode. The following data communication main
menu appears on the display. (Select the LINK icon, then press EXE button.)
Image Set:............Indicates the status of the graphic image send features.
Off: Graphic images not sent.
Monochrome: Pressing
F D
sends graphic images in monochrome.
Color: Pressing
F D
sends graphic images in color.
•{TRAN}/{RECV} ........ Menu of {send settings}/{receive settings}
•{IMGE} .........{menu of graphic image transfer settings}
Communications parameters are fixed at the following settings.
• Speed (BPS): 9600 bits per second
• Parity (PARITY): NONE
4. DATA COMMUNICATIONS