Casio SF-5500B Troubleshooting guide

R
SF-5500B(LX-547E/F)
FEB. 1995
(with price)
SF-5500B

CONTENTS
1. SCHEMATIC DIAGRAM
1-1. MAIN PCB..................................................................................................................1
1-2. KEY MATRIX 1 ..........................................................................................................2
1-3. KEY MATRIX 2 ..........................................................................................................3
2. SPECIFICATIONS ............................................................................................................5
3. REPLACING THE BATTERIES ........................................................................................6
4. RESETTING THE UNIT ....................................................................................................7
5. SAVING DATA ..................................................................................................................8
6. LSI PIN FUNCTIONS
6-1. CPU:LSI1 .................................................................................................................12
6-2. VOLTAGE REGULATOR:REG1 (S-81253) ............................................................13
6-3. VOLTAGE DETECTOR:DET1 (RH5VL46CA) ........................................................13
7. TROUBLESHOOTING ....................................................................................................14
8. DIAGNOSTICS................................................................................................................17
9. ASSEMBLY VIEW ..........................................................................................................23
10. PARTS LIST....................................................................................................................25

— 1 —
1. SCHEMATIC DIAGRAM
1-1. MAIN PCB
Note: There are two kind of PCBs.
Refer to the following matrix.
TYPE LSI3 C14 R3 R4 R11
AOOO—O
B———O—
O: Mounted
—: Not mounted.

— 2 —
1-2. KEY MATRIX 1

— 3 —
1-3. KEY MATRIX 2
M– M+
MR
%
'
MC
÷
9
C
AC
x
6
8
7
–
3
5
4
0
+
=
2
1
.
CODE:22
CODE:17
CODE:16
CODE:23
CODE:21
CODE:18
CODE:13
CODE:12
CODE:19
CODE:20
CODE:14
CODE:09
CODE:08
CODE:15
CODE:10
CODE:05
CODE:04
CODE:11
CODE:06
CODE:00
CODE:07
CODE:01
CODE:03CODE:02
KY1 KY2 KY3 KY4 KY5 KY6 KY7 KY8
KY1
KY2
KY3
KY4
KY5
KY6
KY7
KY8
1
2
3
4
5
6
7
8
9
10
11
12
FG
FG
KY1
KY2
KY3
KY4
KY5
KY6
KY7
KY8
FG
FG
HS3
FG
To Display

— 5—
2. SPECIFICATIONS
Display element: 16-column ×4-line LCD
Memory capacity: 128 kB (126428 bytes)
Main component: LSI
Power supply: 2 lithium batteries (CR2032)
Power consumption: 0.05 W
Battery life*:
Approximately 350 hours continuous operation in Telephone Directory
Approximately 300 hours repeating one minute of input and 10 minutes of display in Telephone
Directory
Approximately 12 months for memory backup
Auto power off: Approximately 6 minutes after last key operation
Ambient
temperature range: 0°C ~ 40°C (32°F ~ 104°F)
Dimensions (HWD):
Unfolded: 8.4 x 139 x 148 mm (3/8x 5 1/2x 5 7/8inches)
Folded: 15.8 x 139 x 74 mm (5/8x 5 1/2x 2 7/8inches)
Weight: 98.2 g (3.5 oz)
*The batteries that come installed in this unit when you purchase it are for
factory test purposes, so they will probably not provide normal service life.
Current consumption:
Power Switch Maximum [µA]
OFF 11.0
ON 510

— 6—
3. REPLACING THE BATTERIES
1. Loosen the screw on the back of the SF-5300B that
holds the battery compartment cover in place, and
remove the cover.
2. Loosen the screw that secures one of the two battery
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. Be 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 careful that you do not overtighten the screw.
5. Repeat Steps 2 through 4 for the other battery.
• Be sure to replace both batteries. Never mix old batteries with new ones, and be sure to use
CR2032 lithium batteries only.
6. After you replace both batteries, replace the battery compartment cover and secure it by tightening
its screw.
• Be careful that you do not overtighten the screw.
Screw
RESET

— 7—
4. RESETTING THE UNIT
The following procedures erase all data stored in the memory of the SF-5300B.
1. Turn on the unit and press the RESET button with a thin, pointed object.
2. Press Y to reset the memory and delete all data, or N to abort the reset
operation without deleting anything.
Following the reset operation described above, the Home Time display appears and the SF-
5300B settings are initialized as noted below.
ALL DATA
CLEAR!
OK? Y/N
CAPS
RESET Button
Sound: Schedule alarm →ON
Reminder alarm →ON
Daily alarm →OFF
Key →ON
Character Input: CAPS
Home Time: 12-hour format
JAN/1/1995
AM/12:00 00
Zone: London(LON)
World Time: New York(NYC)
Daily Alarm: 12:00 PM
RESET

— 8—
5. SAVING DATA
The SF-5300B can transfer the customer's data (both the open and secret areas) to another SF-5300B.
• Turn off both the transmitting and receiving units and connect them using the SB-60/62 cable.
1Setting up the receiving unit:
1. Do the reset operation.
2. Enter the calculator mode. Set the date of receiving unit to February 3rd, 1901.
Operation:
Note: The customer may have created a password to protect confidential information from
unauthorized access. To be sure this password is transferred to the receiving unit, be sure
to set the date as described above.
ON MENU 61TIME
DATE 2TIME DATE 3TIME DATE R
M+
M SUN
1901/ 2/ 3
SB-60/62

— 9—
3. Press , , and twice.
4. Press to select DATA COMM.
5. Press to select RECEIVE.
*If the password isn't
registered in the SF-5300B,
the display shows X instead
of "1."
CAPS
1* TO SECRET AREA
2 ALL DELETE
3 LABEL EDIT
4 DATA COMM
1 SEND
2 RECEIVE
3 SET UP PAR.
CAPS
DATA
RECEIVE OK
TO STOP
PRESS (ESC)
CAPS
4
1FUNCMENU
2

— 10 —
2Setting up the transmitting unit:
Set the hardware parameters as follows:
Parity: None Bit length: 7 BPS: 9600
1. Press , , and .
2. Press twice.
3. Press to select DATA COMM.
4. Press to select SET UP.
5. Use , , , or to select "N," "7," and "9600" and press .
*If the password isn't
registered in the SF-5300B,
the display shows Xinstead
of "1."
FUNC
1* TO SECRET AREA
2 ALL DELETE
3 LABEL EDIT
4 DATA COMM
CAPS
1 SEND
2 RECEIVE
3 SET UP PAR.
CAPS
✻✻ SET UP PAR. ✻✻✻
PARITY E O N
BIT LENGTH 78
BPS 4800 9600
CAPS
1 SEND
2 RECEIVE
3 SET UP
CAPS
ON MENU 1
4
3
SET

— 11 —
6. Press to select SEND.
7. Press to select ALL DATA.
8. Press to start data transmission or to abort the operation without sending
anything.
• If an error occurs during data transmission, the message “TRANSMIT ERROR!” appears on
the display. Press to clear the error message.
9. After data transmission is complete, the display returns to the initial screen of the telephone
mode.
1 ONE ITEM
2 MODE DATA
3 ALL DATA- SEND -
CAPS
SEND ALL DATA?
SET/ESC
CAPS
3
1
SET
DATA
SENDING
TO STOP
PRESS (ESC)
CAPS
ESC
ESC

— 12 —
Pin No. Name I/O Description
1 ~ 5 C0 ~ 4 Out Common signal for display
6 GND In GND 0 V
7,8 BZ1,2 Out Buzzer terminal
9 VDD In Power supply terminal (+5.3 V)
10 CSRA1 Out Chip enable signal for LSI2
11 CSRA2 Out Chip enable signal for LSI3
12 CSROM Out Chip enable signal (Not used)
13 WEB Out Write enable signal for LSI2 and LSI3
14,15 RA15,16 Out Address bus (Not used)
16 ~ 30 A0 ~ 14 Out Address bus
31 ~ 38 IO0 ~ 7 I/O Data bus
39 ~ 54 KY0 ~ 15 I/O Key signal
55 SW In Battery switch Power on: 0 V off: 6 V
56 DEBUG - Not used
57 ON Out Data communication enable signal
58 CRCKI In GND 0 V
59 SOUTB Out Transmission data output
60 SIN In Receiving data input
61 VDD In Power supply terminal (+5.3 V)
62 TEST - Not used
63 VTM - Not used
6. LSI PIN FUNCTIONS
6-1. CPU: LSI1
No.1

— 13 —
Pin No. Name I/O Description
64,65 OSC I/O I/O Clock terminal
67,69~71 V1 ~ 4 Voltage for LCD drive
OFF: 0 V ON–V1: 0.64 Minimum ~ 1.29 Maximum V
V2: 1.29 Minimum ~ 2.56 Maximum V
V3: 3.99 Minimum ~ 2.71 Maximum V
V4: 4.64 Minimum ~ 3.99 Maximum V
68 NC - Not used
72 INTO In Low battery detection INTO < 5.2 V => No power on
73 STNT - GND 0 V
74 VLCD In Power supply terminal (+5.3 V)
S0 ~ 95 Out Segment signal for display
C5 ~ 32 Out Common signal for display
168,200 NC - Not used
172 ~199
75 ~ 171
6-2. VOLTAGE REGULATOR: REG1 (S-81253)
Output Voltage (VDD): 5.3 V ±5%
1
GND 2 VCC 3 VDD
VDD
GND
VCC
VREF
RA
RB
1
23
RI
+
–
Input Voltage (VCC) Output Voltage (OUT)
VCC > 5.2 V 5.2 V
VCC < 5.2 V 0 V
3
GND
1
OUT 2
VCC
1
2
3
VCC
OUT
GND
6-3. VOLTAGE DETECTOR: DET1 (RH5VL46CA)

— 14 —
7. TROUBLESHOOTING
START
Is the display contrast adjustment OK? N
Y
N
Y
Y
N
Doesthe unit sound witheach key entry? Y
N
N
Y
N
N
Y
Y
Are the capacitors C8, C9, C10, C11,
C12, and C13 OK?
1
Replace C8, C9, C10, C11, C12, or
C13.
Adjust the display contrast.
Replace the batteries.
Check another function.
Does the display appear by pressing
the reset button?
Refer to "No/Erratic Display."
Do the batteries make positive contact
with the battery springs? Adjust the contact and clean the
battery springs.
Is Pin 3 of REG1 5.3 V?
Replace REG1.
No power on
Are the power of batteries strong enough?

— 15 —
N
Y
N
Y
N
Y
Is Pin 13 of LSI1 sending the signal? N
Y
Is the soldering of LSI2 or LSI3 poor? Y
N
Is the soldering of LSI1 poor?
N
Replace LSI1.
Y
START
Is Pin 1 of DET1 5.2 V? Replace DET1.
Replace LSI1.
Replace LSI1.
Resolder.
Is Pin 11 of LSI1 sending the signal?
Replace LSI1, LSI2.
1
Does the rubber key contact make positive
contact with the PCB assembly? Replace the rubber key contact.
Resolder.
No key input

— 16 —
No/Erratic display
N
Y
Is input Pin 2 of REG1 6 V? NAdjust the contact and clean
the battery springs.
Y
Is output Pin 3 of REG1 5.3 V? N
Y
N
Y
Are the voltages of V1, V2, V3, and V4
strong enough?
V1: 1.3 V
V2: 2.5 V
V3: 2.7 V
V4: 3.9 V
Is the soldering of LSI1 poor?
N
Replace LSI1.
YResolder.
High current consumption
START
Y
N
Are the capacitors C8, C9, C11, C12,
and C13 OK?
N
Y
Is there any short circuit on the PCB
assembly ?
START
Note:
Contrast: Maximum
Replace C1, C2, C3, or C4.
Repair shorts.
Resolder or replace LSIs and ICs.
Replace the capacitor(s).
Replace REG1.
Replace the batteries.
Are the power of batteries strong enough?

— 17 —
Notes: 1. Be sure to transfer data to another SF-5300B unit before entering
the diagnostic mode, because the data will be changed by entering
the diagnostic mode.
2. The shorting pads shown in the following illustration are covered by a
blind label.
3. To exit the diagnostic mode, press the reset button.
To enter the diagnostic mode:
1. Slide the battery switch to the up position.
2. Press while shorting the shorting pads.
3. Press .
5 I/F: Not used
SELF TEST PROG.
PRESS SEARCH
QUIT BY OFF
CASIO APR 1994
TEST 2 MEMORY
MENU 3 KEY
4 BUZZER
1 DISP 5 I/F
ON
SEARCH
Blind Label
Battery Switch
Check Pads
8. DIAGNOSTICS

— 18 —
Operation Display Note
Display check
To return to the
TEST MENU,
press .
Press 1 on the TEST MENU.
Display Check
1
ESC
2
3
4
5
DISP 4 RVS.
1 WHITE 5 FRAME
2 BLACK 6 DOT4
3 CHECK. 7 TIME
Frame display
All dots displayed
Checker displayed
Reverse checker
display
No display
,ACC CAPS SHIFT SEARCH

— 19 —
Operation Display Note
Check to see if
timer is working.
7
Shows dots at
corners.
Memory Check
The functions of the numbered items on the display include:
1. Writes the test pattern in the ROM to the RAM area. (Test pattern: Incremental order 00,
01, and so on)
2. Compares the test pattern with the write data (WRITE1) of the RAM and displays the
results.
3. Writes the test pattern in the ROM to the RAM area. (Test pattern: Decremental order
FF, FE, and so on)
4. Compares the test pattern with the write data (WRITE2) of the RAM and displays the
results.
6
ESC
TIME DISPLAY
00:00:XX
TEST 2 MEMORY
MENU 3 KEY
4 BUZZER
1 DISP 5 EXT
RAM check
To return to the
TEST MENU,
press .
5: Not used
6: Not used
2 MEMORY 3 WR2
4 READ2
1 WR1 5 DUMP
2 READ1 6 CHKSUM
1
( or 3 ) WRITE1
( or WRITE2 )
ESC
Operation Display Note