Casio Sf-8500 Troubleshooting guide

SF-8500(LX-575)

AUG. 1993

(without price)

INDEX

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. CPU pin description (HD62076C02)............................................................ 21

10-4. Gate array pin descriptions (µPD65005GC-566-3B6)................................ 22

10-5. Power supply chip IC pin descriptions (SC371015FU) ............................. 22

10-6. Character generator ROM pin descriptions (HD62063B01) ..................... 23

10-7. Operation program ROM pin descriptions (µPD23C4001EBGW-304) ..... 24

10-8. RAM pin descriptions (M5M51008AFP-10LL) ............................................ 24

11. DIAGNOSTIC OPERATION ........................................................................................ 25

12. TROUBLESHOOTING................................................................................................. 30

13. PARTS LIST ................................................................................................................ 33

14. PCB VIEW ................................................................................................................... 35

15. ASSEMBLY VIEW ....................................................................................................... 37

— 1 —

1. SCHEMATIC DIAGRAM

1-1. Main PCB

— 2 —

1-2. Display PCB

— 3 —

1-3. Key Matrix

— 5 —

2. SPECIFICATIONS

Data storage:

Telephone/businesscard/memo/scheduledatastorage/recall,calendardisplay,marker,phrasememory,

secret area, editing, capacity display, auto display

Clock:

Average of accuracy ±3 seconds per day under normal temperatures; worldtime, schedule alarm, 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 (65,499 bytes) for the Spreadsheet Mode data plus

64 KB (51,910 bytes) for other mode's data

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: 5yearsifmainbatteriesarereplacedas soon as they become weak.

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

• Note That the life of the battery that comes with the unit starts when the

battery is loaded in the unit at the factory. The life you get from the battery may

be shorter than normal because of the time the unit spends in transport, on

the shelf, etc.

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 illustration.

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 2 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.

DELETE ALL DATA ITEMS

STORED IN MEMORY ?

YES Y / NO N

2. Press Y to reset the SF Unit and clear everything from its memory. To abort the procedure

without clearing anything, press N .

— 8 —

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

reset are shown below.

HOME TIME: Washington D.C.

JAN/1/1994 (SAT)

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

6. TO SAVE THE DATA TO OTHER MACHINE

SF-8500 can transfer customers data to other SF-8500 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.

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

the drawing.

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+

DATE

TIME

— 9 —

To change the hardware

parameters, press the

, , and

cursol keys.

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.

6) Set up the customer's machine.

1 While the transmitting unit is in the Calendar Display, Telephone 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 Calendar 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

TEL FUNCTION 41 SEND

2 RECEIVE

3 PRINT

4 HARDWARE PARAMETERS

5 DATA TO RAM CARD

6 PEN PRINTING

TEL

TEL FUNCTION 4 4

To set the hardware

parameters, press the set

key.

FUNCTION

— 10 —

1 ONE DATA ITEM

2 MODE DATA ITEMS

3 ALL DATA ITEMS

— SEND —

TEL

SEND ALL DATA ITEMS ?

YES SET / NO ESC

TEL

NOW SENDING !

TO STOP, PRESS ESC

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

whether you wish to proceed.

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

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

SET

TEL

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 , , , ,

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

action and try data communication again.

BUSINESS CARD MEMO SCHEDULE

HOME TIME WORLD TIME CAL CALENDAR

— 11 —

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

There are two types of Memory Capacity Display, as shown below:

SF UNIT: Total memory used for storage of Telephone Directory, Business Card Library,

Memo, Calendar, and Schedule Keeper data.

SPREADSHEET: Total memory used for storage of Spreadseet data.

Press the key and then press the key to check the current memory capacity.

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

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

memory.

SHIFT CAPA

CAPACITY

SF UNIT

SPREADSHEET

60%

20565

16%

54520

FREE

Bytes

0 10050

CAPACITY

SF UNIT

SPREADSHEET

51910

64848

FREE

Bytes

0 10050

— 12 —

8. DISASSEMBLY (SF-8500)

1) To open display unit

1. Remove the key switch sheet from the display frame with care using a sharp tweezers and

remove 2 screws, then remove the display back cover.

2. Remove the blind plate of hinge and then release the 2 screws of hinge cover.

3. Release the 5 screws of display PCB and remove the display PCB.

— 13 —

2) To open battery cover and back cover

1. Release the one screw of battery cover and remove the battery cover.

2. Remove the batteries. (Refer section 3 in this manual.)

3. Release the 8 screws of the back cover. Then, remove the back cover.

4. To check the circuit by oscilloscope, apply the power to main PCB as follow:

GND

+6V

+3V

External Power supply

Prepare some 2P switch for Main switch.

Prepare some power supply for + 6V and +3V.

Switch

— 14 —

C0~C47

CPU

ROM

(Character Generator)

(Operation Program)

HD62063B01

POWER SUPPLY

CHIP FOR LCD

SC371015FU

GATE ARRAY

µPD65005G-566-22

Power supply circuit

VDD

GND

LCD DRIVE VOLTAGES

V1 ~ V4, VREG

TO KEYBOARD DATA BUS

S112~S191S32~S111S0~S31

LCD 192 × 48 dots

INTERFACE FOR

DATA TRANSMISSION

& DATA RECEPTION

OPEN (OFF)

LOCK (ON)

PD23C4001EBGW-304

MSM6585AV

-Z-358B

LCD DRIVERLCD DRIVER LCD DRIVER

MSM6585AV

-Z-358B MSM6585AV

-Z-358B

MAIN SWITCH

RAM

9. BLOCK DIAGRAM

CD760-TS

M5M51008AFP-

10LL

HD62076C02

PCB-L575-1

PCB-L574-E2

— 15 —

VREG,V1~V4

Output

for LCD

driver

PDB

Power supply chip

SC371015FU

VDD2 VDD1

VO1

GND

(Pin2)

(Pin1)

(Pin19)

(Pin31)

VIN

GND VDD

VDDVOT

KAC KIO

ADDRESS BUS

2 MHz

VDD1

MAIN SWITCH

GND

VDD

(Pin53)

(Pin54)

(Pin41)

VDD

(Pin69)

"H"

ADDRESS

DATA

"H"

VDD

"L"

OSCOOSCI

INIT1 (Pin70)

INT0

V2ON

Gate array

VDD

DATA BUS

(Pin40)(Pin45)

(Pin36)

"L"

(Pin31)

(Pin34)(Pin32)

10-1. System chart

Generally, SF-8500 is working with the following steps.

2. Output VDD (4.5V).

1. Supply 5V to VDD1 and VDD2.

OFF

10. CIRCUIT EXPLANATIONS

CPU

HD62076C02

Power supply

Circuit

LSO

"H"

SWO

"L"

(Pin32)

(Pin22)

µPD23C4001EBGW-304

(Operation program)

ROM

LSI (Pin26)

MON

µPD65005GC-566-3B6 VOB

(Pin25)

VDD

GNDVCC

(Pin3)

(Pin1)

"H"

"L"

(Pin2)

OEO

(Pin40)

(Pin27)

"L"

(Pin43)

(Pin39)

RSO (Pin49)

"L"

CEOE

(Pin24) (Pin22)

3. Output "L" from SWO terminal.

5. Main switch ON.

6. Input "L" to SW terminal.

7. Output "L" from KAC terminal.

8. Push power on button switch.

4. Output "H" from LSO terminal.

9. CPU oscillation is generated.

10. Output "H" from V2ON terminal.

13. Output "L" from VOB terminal.

15. Gate array sends ROM output

enable signal from OE terminal.

18. CPU receives data from ROM.

11. Output "H" from VOT terminal.

12. Output all LCD drive voltages.

14. Apply VDD to ROM.

16. Gate array sends ROM Chip enable

enable signal from CE terminal.

17. CPU sends address to ROM.

Transistor Q1

(Pin7)

(Pin33)

— 16 —

10-2. Power supply circuit

1) Power supply circuit for CPU, GATE ARRAY, CG ROM and RAMs.

When the memory back-up battery or main batteries are set, the voltage supplies at the terminal VDD1

(Pin No.1) of SC371015FU (LSI2) through the diode MA743 (D1).

When LSI2 receives a voltage, the regulated voltage VDD (4.3V~4.7V) will be applied to the VDD lines

from the terminal VO1 (Pin No.2).

HD62076C02 (LSI1), µPD65005GC-566 (LSI3), HD62063B01 (LSI4), and M5M51008AFP-10LL

(LSI5) are connected the VDD lines.

2) Power supply circuit for ROMs

When the GATE ARRAY (LSI3) controls the terminal VOB (Pin No.39) with "L" level, the transistor

2SA1411 (Q1) will be turned ON, then the voltage of the VDD lines will be applied the VCC lines.

The voltage of the ROM (LSI6) is supplied from the VCC lines.

3) Main switch

The CPU (LSI1) detects the informations of the Main switch by the terminal SW (Pin No.36) from the

SWO signal of the GATE ARRAY (LSI3).

4) How to turn the display ON.

When pressing "ON" key under the ON side of the Main switch , the CPU (LSI1) generates the signal

to turn the display ON at the terminal V2ON (Pin No.45).

This signal goes to the terminal VIN (Pin No.31) of the GATE ARRAY (LSI3), then the GATE ARRAY

(LSI3) generates "H" level at the terminal VOT (Pin No.32). When the power supply chip (LSI2) re-

ceives "H" level at the terminal PDB (Pin No.31) from VOT, the LSI2 generates the outputs VSS (Pin

No.8) and V1~V4 (Pin No.9~12) for LCD drivers.

5) How to detect the voltage for the main batteries.

There are three detectors of the main batteries in the circuits.

When the voltage of the VDD lines becomes +4.58V±0.155V, the terminal VCOMP2 (Pin No.7) of the

power supply chip (LSI2) becomes "L" level, then this signal goes t the terminal P7 (Pin No.79) of the

CPU (LSI1) and the terminal BLI (Pin No.29) of the GATE ARRAY (LSI3).

The CPU detects the low battery condition, and the display shows "MAIN POWER SUPPLY GETTING

WEAK".

When the voltage of the VDD lines becomes +4.38V ±0.155V, the terminal VCOMP1 (Pin No.6) of the

power supply chip (LSI2) bocomes "L" level, and the terminal BLI (Pin No.29) of the GATE ARRAY

(LSI3) receives this shignal, then the display turns OFF.

— 17 —

When the voltage from the main batteries becomes +3.7V ±0.1V, the terminal VCOMP0 (Pin No.5) of

the power supply chip (LSI2) becomes "L" level, then this signal goes to the terminal PDN (Pin No.28)

of the GATE ARRAY (LSI3). After this, the terminal VOT (Pin No.32) of GATE ARRAY (LSI3) become

"L" level, and the terminal PDB (Pin No. 31) of the power supply chip (LSI2) receives this signal.

In this condition, the voltages for LCD will be cut off compulsorily.

When the voltage from the memory back-up battery becomes +2.5V±0.065V, the terminal SUBOUT

(Pin No.4) of the power supply chip (LCI2) becomes "L" level, and the terminal P6 (Pin No.78) of the

CPU (LSI1) detects the low battery condition. The display shows "MEMORY BACKUP BATTERY

GETTING WEAK".

6) Others

The voltages of the circuit are applied from the main batteries or the memory back-up battery by the

diode MA743 (D3). The voltage of memory back-up is also provided with the main batteries.

— 18 —

7) Power supply chip SC371015FU

VDD1

VDD2

VO1 VDD

PDB

GATE ARRAY

VOT terminal

FROM

(4.3 V ~ 4.7 V)

20 17

GND1

31 VSS(VREG) -3.07 -5.27

V1 +3.50 +3.23

V2 +2.57 +2.02

V3 -1.16 -2.80

V4 -2.11 -4.04

LCD DRIVE VOLTAGE Value (Approx.) [V]

Contrust : Min. Contrust : Max.

The IC SC371015FU is power supply chip for

SF-8500. When IC SC371015FU receives a Volt-

age 5V from main power supply circuit at the ter-

minal VDD1(Pin No.2), the regulated voltage

VDD (4.3~4.7V) will be applied to the VDD lines.

The outputs VSS (VREG) and V1~V4 are the

LCD drive voltages. When the terminal PDB be-

comes "H", those voltages are generated by IC

SC371015FU and capacitors C3 and applied to

LCD driver IC MSM6385AV-Z-358B.

The voltages for LCD driving are shown below:

MAIN POWER

SUPPLY CIRCUIT

GND2

SUB IN

CR2032

Back-up battery

VSS 9

V2 10

V3 11

V4 12

POWER SUPPLY CHIP

SC371015FU

V COMP2

V COMP1

V COMP0

SUB OUT

The V comp0 ~ V comp2 and Sub out outputs are the battery voltage detection outputs. According to

VDD1 and VDD2 voltages, those outputs will change the status as follows:

OUTPUTS STATUS "H" STATUS "L" NOTE

V COMP 0 When the VDD1,2 voltages When the VDD1,2 voltages Switch off the LCD

are more than 3.7±0.1V. are less than 3.7±0.1V. driving voltages

V COMP 1 When the VDD1,2 voltages When the VDD1,2 voltages Main battery check

are more than 4.38±0.155V.are less than 4.38±0.155V.

V COMP 2 When the VDD1,2 voltages When the VDD1,2 voltages Main battery check

are more than 4.58±0.165V.are less than 4.58±0.165V.

SUB OUT When the SUB IN voltage When the SUB IN voltage Back-up battery check

is more than 2.5±0.065V. is less than 2.5±0.065V.

— 19 —

LSI MON

SWO

LSO

" L "

" H "

GNDVDD

CSB

" H "

FROM CPU

CS2 terminal (Pin 28)

(Pin 25)(Pin 26)

(Pin 40)

(Pin 24)

TO CPU

TO MAIN SWITCH

"L" "H"

OFF

ON SWO

CPU

GATE ARRAY

MAIN SWITCH

VDD

"L"

KAC KIO

(Pin36)

(Pin40)

(Pin54) (Pin53)

POWER ON SWITCH

(Pin 27)

(Pin 70)

INT0 terminal

8) Gate array

9) Main switch and power on switch

When the main switch is set to on position, SW terminal of CPU becomes "L", then CPU will send "L"

signal to KAC terminal to enable the system power on. The KI0 terminal is "H" when VDD is applied to

CPU. Therefore, when pressing the power on switch, CPU will generate a clock pulse (2 MHz) for start

up the system.

µPD65005GC-566-3B6

HD62076C02

GATE ARRAY

µPD65005GC-566-3B6

GND

Open

(Pin 34) (Pin 33)

(Pin 7)

When VDD is applied from power supply IC

SC371015FU to gate array µPD65005GC-556-

3B6, gate array will send "L" signal to active the

main switch signal from terminal SWO.

Also, gate array will send "H" signal to release

the INT0 terminal of CPU from LSO terminal.

The terminal CSB is for the chip select of gate

array. This signal is sent from CPU terminal

CS2. And when the VDD is applied to CPU, CPU

will send "H" signal to CSB terminal.

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Casio SF-8500 Troubleshooting guide

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