Casio SF8350 Service Manual

SF-8350(LX-572)

INDEX

JUNE 1993

(without price)

CONTENTS

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

2. SPECIFICATIONS ......................................................................................................... 5

3. TO REPLACE THE BATTERY...................................................................................... 6

4. ERROR MESSAGE ....................................................................................................... 7

5. TO RESET THE DIGITAL DIARY ................................................................................. 7

6. TO SAVE THE DATA TO OTHER MACHINE............................................................... 8

7. TO CHECK THE MEMORY CAPACITY...................................................................... 11

8. DISASSEMBLY ........................................................................................................... 12

9. BLOCK DIAGRAM ...................................................................................................... 14

10. CIRCUIT EXPLANATIONS

10-1. System chart................................................................................................. 15

10-2. Power supply circuit .................................................................................... 16

10-3. Battery voltage detection ............................................................................ 19

10-4. CPU pin description ( 10-5. Gate array pin descriptions (

10-6. Power supply chip IC pin descriptions (SC371015FU) ............................. 21

10-7. Character generator ROM pin descriptions (HD62063B01) ..................... 22

10-8. Operation program ROM pin descriptions (

10-9. RAM pin descriptions (µPD43256AGU-10/12/15LL) .................................. 23

10-10. RAM pin descriptions (HM62L864LFP-12MRL) ......................................... 23

11. DIAGNOSTIC OPERATION ........................................................................................ 24

12. TROUBLE SHOOTING................................................................................................ 29

µPD3055GF002-2BA) ............................................... 21

µPD65005G-452-22)..................................... 21

µPD23C4001EBGW-301)..... 23

13. PARTS LIST ................................................................................................................ 32

14. PCB VIEW ................................................................................................................... 34

15. ASSEMBLY VIEW....................................................................................................... 35

1. SCHEMATIC DIAGRAM

1-1. Main Block

— 1 —

1-2. Display Block

— 2 —

1-3. Key Matrix

— 3 —

2. SPECIFICATIONS

Data storage:

Telephone/business card/memo/schedule data storage/recall, calendar display, marker, phrase memory, secret area, editing, capacity display, auto display

Clock:

Average of accuracy ±3 seconds per day under normal temperatures; worldtime, schedule alam, daily alarm

Calculation:

12-digit arithmetic calculations, constants for + / – / × / ÷ , independent memory, percentages, square roots, 24-digit approximations, date calculations, other mixed calculations

General: Display element: 32-column × 6-line LCD Memory capacity: 64 KB (56,006 bytes) Main component: LSI Power supply: Main Power Supply — Two CR2032 lithium batteries

Backup Power Supply — One CR2032 lithium battery

Power consumption: 0.05W Battery life: Main: Approximately 120 hours (Repeated cycle of 1-minute data input

into Telephone Directory followed by 10-minute display. Operation temperature of 20°C) Approximately 150 hours (Continuous display in Telephone Directory. Operation temperature of 20°C)

Backup: 5 years if main batteries are replaced as soon as they become weak.

1 year if dead main batteries are left in the unit.

Auto power off: Approximately 6 minutes after last key operation Operating temperature: 0°C ~ 40°C (32°F ~ 104°F) Dimensions: Unfolded: 10.5H × 154W × 155.2mmD (3/8"H × 6"W × 61/8"D)

Folded: 17.9H × 154W × 78mmD (3/4"H × 6"W × 31/16"D)

Weight: 152.5g (5.4 oz) including batteries

Current consumption:

Power switch TYP. [µA] MAX [µA] OFF 8 29 ON 1,447 13,258 ON (Operating) 6,707 19,958

— 5 —

3. TO REPLACE THE BATTERY

A) To replace the main batteries

Before replacing the main batteries, note the following precautions.

•Do not remove the back-up battery from the SF Unit while main batteries are removed.

• Be sure to replace both batteries at the same time, and do not use an old battery with a new one.

1. Remove the screw that hold the battery compartment cover in

place.

2. Remove the battery compartment cover by sliding it in the

direction indicated by the arrow in the illustation.

3. Slide the main battery holder in the direction indicated by the

arrow.

4. Remove both old batteries and replace with two new ones.

• Use two new batteries. Wipe the surfaces of the batteries with a soft, dry cloth. Make sure that the positive (+) sides of the batteries are facing up (so you can view the positive sides as the batteries lie in the battery compartment).

5. Replace the battery holder.

6. Replace the battery compartment cover and fasten it in place using the screw.

B) To replace the back-up battery

Before replacing the back-up battery, note the following precautions:

• Do not remove the main batteries from the SF Unit while back-up battery is removed.

• Be sure to replace the back-up battery at least once a year.

1. Remove the screw that hold the battery compartment cover in place.

2. Remove the battery compartment cover by sliding it in the direction indicated by the arrow in the illustration.

3. First , remove this sticker from the back-up battery holder.

4. After removing this sticker, take the screw off that secures the back-up battery holder in place, and then remove the battery holder.

5. Remove the old battery and replace it with a new one.

• Wipe the surfaces of the battery with a soft, dry cloth.

Make sure that the positive (+) side of the battery is facing up (so

you can view the positive side as the battery lies in the battery compartment.)

6. Replace the back-up battery holder and fasten it in place using the screw, and replace the sticker over the battery holder.

7. Replace the battery compartment cover and fasten it in place using the screw.

— 6 —

4. ERROR MESSAGE

Message Meaning Action

DATA ITEM NOT Text specified for Correct or change FOUND! search does not exist. specified text.

PASSWORD Wrong password Enter correct MISMATCH! entered. password.

MEMORY FULL! No more room in Delete unnecessary

DATA ERROR! Abnormal data caused Consult the "DATA CONSULT YOUR by strong impact, static ERROR" section on OWNER'S MANUAL electricity, etc. page 3 of owner's UNDER "DATA manual. ERROR"

memory for storage of data items from

data. memory.

5. TO RESET THE DIGITAL DIARY

Before describing the RESET operation, a note of WARNING —

all data stored in memory, including marked data items. Be sure to perform the RESET operation only if you wish to clear all data.

To reset the SF Unit's memory

1. Switch on power and press the RESET button with a thin, pointed object. The following message appears on the display.

DELETE ALL DATA ITEMS

STORED IN MEMORY ?

YES Y / NO N

* Important! Note that the following operation will clear everything stored in the unit's memory. To avoid accidental erasure of important data, be sure to perform this operation only while the system language is set to your native language. See page 2 of owner's manual for infomation on how to change the system language.

The following procedure will erase

2. Press Y to reset the SF Unit and clear everything from its memory. To abort the procedure without clearing anything, press N .

— 7 —

Following the RESET operation, the Home Time Display appears. The initial settings of the SF Unit after reset are shown below.

HOME TIME: G.M.T.

JAN/1/1993 (FRI) 12:00 AM

12-hour format WORLD TIME: New York Daily Alarm: 12:00 PM Sound: Schedule alarm ON

Daily alarm OFF

Key ON Character input: CAPS System Language: English

6. TO SAVE THE DATA TO OTHER MACHINE

SF-8350 can transfer customers data to other SF-8350 with memory protection only when replacing the LCD or the outer case. How to transfer the data.

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

Important!

* You can not perform data communications with the CASIO SF-A series of SF Units (SF-A10,etc.). * Be sure to replace the connector covers on the SF units when you are not performing data communications.

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

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.

CAL

Operation: 1 9 0 1 2 3

CLEAR/AC

TIME TIME M+

DATE DATE

TIME DATE

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

— 8 —

4) Check the hardware parameters, and if the units have another condition, reset as follows.

To change the hardware parameters, press the , , and cursol keys.

To set the hardware parameters, press the set

PARITY EVEN ODD NONE BIT LENGTH7 bits 7 bits 8 bits BPS 1200 2400 4800 9600

HARDWARE PARAMETERS

***

TEL

***

key.

TEL

FUNCTION

4 4

5) Set up the slave machine. 1 While in the Calender Display, Telephone Directory, Business Card Library, Memo Mode, or

Schedule Keeper, press the key followed by to select " DATA COMMUNICA-

FUNCTION

TION", and the following menu appears.

TEL

FUNCTION

1 SEND 2 RECEIVE 3 PRINT 4 HARDWARE PARAMETERS 5 DATA TO RAM CARD 6 PEN PRINTING

TEL

2 Press to select "RECEIVE" and the following display appears to indicate that the slave

machine is ready to receive data.

RECEIVE OK !

TO STOP, PRESS ESC

TEL

6) Set up the customer's machine. 1 While the transmitting unit is in the Calender Display, Telephome Directory, Business Card

Library, Memo Mode, or Schedule Keeper, press the key followed by to select

FUNCTION

"DATA COMMUNICATION", and the following menu appears.

TEL

FUNCTION

1 SEND 2 RECEIVE 3 PRINT 4 HARDWARE PARAMETERS 5 DATA TO RAM CARD 6 PEN PRINTING

TEL

— 9 —

2 Press to select "TRANSMIT" and the following menu appears.

1 ONE DATA ITEM 2 MODE DATA ITEMS

3 ALL DATA ITEMS

TEL

— SEND —

3 Press to select "ALL DATA ITEMS", and the following display appears to confirm

whether you wish to proceed.

SEND ALL DATA ITEMS ?

YES SET / NO ESC

TEL

4 Press the key to proceed with the data transmission, or press if you wish to cancel.SET ESC

SET

NOW SENDING !

TO STOP, PRESS ESC

Data are transmitted in the sequence of Telephone Directory data, Business Card Library data, Memo data, Schedule Keeper data and Calendar data.

* If the customer's machine uses full memory, it takes about one minute and ten seconds for this

transferring.

* The following messages appear on the display of the receiving unit when a problem occurs during

data communications. All data transferred up to display of the message is retained in memory, but data communication is terminated.

If one of the following error messages appear, press the , , , ,

HOME TIME

, , , key, to clear the error message. Then, take corrective

WORLR TIME

CAL

CALENDAR

TEL

BUSINESS CARD

MEMO SCHEDULE

action and try data communication again.

— 10 —

Message Cause

STOPPED ! • ESC key pressed on transmitting or receiving unit.

• Memory area of receiving unit full.

• Battery power drops below a certain level. TRANSMIT ERROR ! Cable connection broken or abnormal noise in cable. MEMORY FULL ! Memory area of receiving unit full.

7. TO CHECK THE MEMORY CAPACITY

The memory Capacity display tells you how much total memory is used for storage of Telephone Directory, Business Card Library, Memo, Calendar, and Schedule Keeper data. It also shows the percentage of total memory used, and how much total memory area remains. Press the key to check the current memory capacity.

CAPA

Following the memory reset operation, the display will appear as follows.

56006 0

When the percentage of memory used reaches 100%, you will not be able to enter any more data into memory.

— 11 —

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