Casio SF-8350 Troubleshooting guide

SF-8350(LX-572)
JUNE 1993
R
(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 (µPD3055GF002-2BA) ............................................... 21
10-5. Gate array pin descriptions (µPD65005G-452-22) ..................................... 21
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 (µPD23C4001EBGW-301) ..... 23
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
13. PARTS LIST ................................................................................................................ 32
14. PCB VIEW ................................................................................................................... 34
15. ASSEMBLY VIEW ....................................................................................................... 35

— 1 —
1. SCHEMATIC DIAGRAM
1-1. Main Block

— 2 —
1-2. Display Block

— 3 —
1-3. Key Matrix

— 5 —
2. SPECIFICATIONS
Data storage:
Telephone/businesscard/memo/scheduledatastorage/recall, calendardisplay, 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 arithmeticcalculations, constants for+/–/× /÷,independent memory, percentages, squareroots,
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 Direc-
tory. Operation temperature of 20°C)
Backup: 5years ifmain batteriesare replacedas soon as they becomeweak.
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

— 6 —
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.

— 7 —
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
memory for storage of data items from
data. memory.
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"
4. ERROR MESSAGE
5. TO RESET THE DIGITAL DIARY
Before describing the RESET operation, a note of WARNING — The following procedure will erase
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.
2. Press Y to reset the SF Unit and clear everything from its memory. To abort the procedure
without clearing anything, press N .
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.

— 8 —
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 commu-
nications.
1) Turn off the power switch and connect the two units using the cable (SB-60 or SB-62) as shown in
the drawing.
ON
CLEAR/AC
CAL
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 9 0 1 2 3
If you don't set the date, the "PASSWORD" isn't transferred to the slave machine.
DATE DATE
TIME TIME M+
R
DATE
TIME

— 9 —
HARDWARE PARAMETERS
PARITY EVEN ODD NONE
BIT LENGTH7 bits 7 bits 8 bits
BPS 1200 2400 4800 9600
TEL
2 Press to select "RECEIVE" and the following display appears to indicate that the slave
machine is ready to receive data.
1 SEND
2 RECEIVE
3 PRINT
4 HARDWARE PARAMETERS
5 DATA TO RAM CARD
6 PEN PRINTING
TEL
RECEIVE OK !
TO STOP, PRESS ESC
TEL
4) Check the hardware parameters, and if the units have another condition, reset as follows.
2
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
"DATA COMMUNICATION", and the following menu appears.
FUNCTION 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-
TION", and the following menu appears.
TEL FUNCTION 4
4
TEL FUNCTION 41 SEND
2 RECEIVE
3 PRINT
4 HARDWARE PARAMETERS
5 DATA TO RAM CARD
6 PEN PRINTING
TEL
2
TEL FUNCTION 4 4
To change the hardware
parameters, press the
, , and
cursol keys.
To set the hardware
parameters, press the set
key.
FUNCTION