Casio SF4300B Service Manual

SF-4300B(LX-588)

MAR. 1994

(with price)

SF-4300B

R

CONTENTS

1. SCHEMATIC DIAGRAM.................................................................................................... 1

1-1. MAIN PCB.................................................................................................................. 1

1-2. KEY MATRIX ............................................................................................................. 2

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

3. TO REPLACE THE BATTERIES....................................................................................... 5

4. DATA TRANSFER............................................................................................................. 6

5. OPERATION REFERENCE............................................................................................. 10

5-1. RESET OPERATION ............................................................................................... 10

5-2. TO ADJUST THE DISPLAY CONTRAST ............................................................... 11

5-3. TO CHECK THE MEMORY STATUS ...................................................................... 11

5-4. THE SOUND MENU................................................................................................. 11

6. LSI, IC (Pin function) ...................................................................................................... 12

6-1. CPU .......................................................................................................................... 12

6-2. RAM:

6-3. VOLTAGE REGULATOR:S-81253SGUP (REG1) .................................................. 14

6-4. VOLTAGE DETECTOR:S-80752AN (DET1)........................................................... 14

µPD43256G-101215LL (LSI3)........................................................................ 13

7. TROUBLESHOOTING..................................................................................................... 15

8. HARD CHECK ................................................................................................................. 18

9. ASSEMBLY VIEW ........................................................................................................... 23

10. PARTS LIST .................................................................................................................... 25

1. SCHEMATIC DIAGRAM

1-1. MAIN PCB

— 1 —

1-2. KEY MATRIX

— 2 —

2. SPECIFICATIONS

Data storage:

Storage and recall of telephone, memo, schedule, reminder data; calendar display; secret area; editing;
memory status display.

Clock:

World time; reminder alarm; schedule alarm; daily alarm; accuracy under normal temperatures: ±3
seconds average.

Calculation:

10-digit arithmetic calculations; arithmetic constants (+, –, ×, ÷); independent memory; percentages;
square roots; 20-digit approximations; date calculations; other mixed calculations.

General:
Display element: 16-column × 4-line LCD
Memory capacity: 32 KB (28579 bytes)
Main component: LSI
Power supply:2 lithium batteries (CR2032)
Power consumption: 0.05W
Battery life:

Approximately 500 hours continuous operation in Telephone Directory
Approximately 400 hours repeating one minute of input and 10 minutes of display in Telephone
Directory
Approximately 12 months for memory back up
Test condition: 20°C

Auto power off: Approximately 6 minutes after last key operation
Operating temperature: 0°C ~ 40°C (32°F ~ 104°F)
Dimensions:

Unfolded: 9.6H × 122W × 158.5Dmm (
Folded: 12.4H × 122W × 81.5Dmm (

Weight: 89g (3.1 oz)

3

/8"H × 4 3/4"W × 6 1/4"D)

1

/2"H × 4 3/4"W × 3 1/4"D)

Current consumption:

Power switch TYP. [µA] MAX [µA]

OFF 4.85 10.0

ON 225 380

Storage Capacity:

The 32K bytes memory capacity includes a 28579 bytes user area. The following shows examples

of what this means for the storage of data in each mode.

Telephone Directory:

Approximately 1360, under the following conditions: 8-character name

10-character telephone number

Approximately 680, under the following conditions: 8-character name

10-character telephone number
20-character address

— 3 —

Memo:

Approximately 1290, 20-character memos

Schedule Keeper:

Approximately 890, under the following conditions:

1 item per day, 20 characters per item
30 days per month
Starting time specified, alarm time set

Approximately 1020, under the following conditions:

1 item per day, 20 characters per item
30 days per month
Starting time specified, no alarm time

Reminder:

Approximately 1680, under the following conditions: 10 characters per item
Approximately 1900, under the following conditions: 10 characters per item

Alarm time set

No alarm time

— 4 —

3. TO REPLACE THE BATTERIES

1) Loosen the screw on the back of the SF-4300B that

Screw

holds the battery compartment cover in place, and
remove the cover.

2) Loosen the screw that secures one of the two battery

RESET

holders in place and remove the battery holder.

Caution
Be sure to remove only one battery at a time.
Otherwise, you will lose all data stored in memory.

3) Replace the old battery with a new one, making sure

that the positive (+) side of the new battery is facing up
(so you can see it).

4) Replace the battery holder and secure it by tightening its screw.

• Be sure careful that you do not over tighten the screw.

5) Repeat steps 2) through 4) for the other two batteries.

• Be sure to replace all two batteries. Never mix old batteries with new ones, and be sure to use
CR2032 lithium batteries only.

6) After you replace all two batteries, replace the battery compartment cover and secure it by tightening
its screw.

• Be careful that you do not over tighten the screw.

— 5 —

4. DATA TRANSFER

SF-4300B can transfer customers data to other SF-4300B with memory protection only when replacing
the LCD or the outer case. How to transfer the data.

* Before connecting the cable (SB-60/62), be sure to reset the slave machine to clear all data.

1) Turn off the power switch and connect the two units using the cable (SB-60/62) as shown in the
drawing.

SB-60/62 accessory cable

2) Turn on the power switch of each machine.

3) The slave machine must be set the date of Feb. 3rd, 1901 into the memory under the calculator mode.

Operation: 1. Press

ON MENU

2. Select "CAL" mode or press 6.

TIME TIME TIME M+

3.

123

DATE DATE DATE R

M SUN

1901/ 2/ 3

If you don't set the date, the "PASSWORD" isn't transferred to the slave machine.

— 6 —

Setting up for Data Communications

The following procedures describe what you should do to set up for data communications between
two SF Units or between an SF Unit and a personal computer. In addition to hardware connections,
it details how to set up the communications parameters and how to set up the SF-4300B to receive
data. By following these instructions carefully, you can be ensured of successful communications
every time.

To connect two SF Units

1. Check to make sure that the power of the two SF Units is switched off.

2. Remove the covers from the connectors on the two SF Units.

3. Connect the two SF Units using the optional SB-60/62 cable. You can also connect them using

an SB-60/62 cable.

Important

Be sure to replace the connector covers on the SF Units when you are not performing data
communications.

4) Check the hardware parameters.

1. Select "TEL" mode or press 1 under MENU screen.

2. Press FUNC twice to display the second function menu.

FUNC FUNC

1* TO SECRET AREA
2 ALL DELETE
3 LABEL EDIT

*If the password isn't

registered in the SF unit,
display shows X instead
of "1".

4 DATA COMM

CAPS

• You can perform the above operation while the initial screen of the Memo Mode, Schedule
Keeper, Calendar, or Reminder is displayed also.

3. Press 4 to select DATA COMM.

4

1 SEND
2 RECEIVE
3 SET UP PAR.

CAPS

4. Press 3 to select SET UP.

3

✻✻ SET UP PAR. ✻✻✻

PARITY E O N

•N is blinking.

BIT LENGTH 7 8
BPS 4800 9600

CAPS

— 7 —