Casio NX-4000 Troubleshooting guide

NX-4000/6000
R
(without price)
SEP. 1995
INDEX

FEATURES.................................................................................................................... 1
SPECIFICATIONS ......................................................................................................... 2
BATTERY REPLACEMENT.......................................................................................... 4
REPLACING THE BACK-UP BATTERY ...................................................................... 4
RESET OPERATION..................................................................................................... 5
TO SAVE THE DATA TO ANOTHER UNIT.................................................................. 6
BLOCK DIAGRAM ........................................................................................................ 8
TOUCH PANEL CIRCUIT.............................................................................................. 9
PIN FUNCTION............................................................................................................ 10
DIAGNOSTIC PROGRAM........................................................................................... 11
MESSAGE TABLE ...................................................................................................... 15
SCHEMATIC DIAGRAMS ........................................................................................... 17
PARTS LIST ................................................................................................................ 21
EXPLODED VIEW ....................................................................................................... 24
CONTENTS

— 1 —
FEATURES
• Pen-based graphic user interface
Simply tap on display icons and buttons to perform any operation.
• Color display
The display shows data in three colors: orange, blue, and green. Different colors can be used to highlight
specific dates in the Calendar.
• Desktop Menu System
Functions are represented by realistic icons that are arranged on a desk in your virtual office. Simple tap on
the icon that represents a function to access it.
• 256 kbytes (NX-6000) / 128 kbytes (NX-4000) of memory
You get enough memory to store up to 11,100 (NX-6000) / 5,200 (NX-4000) Telephone Directory items.
• Powerful data bank functions
Telephone Directory, Business Card Directory, Memo, Sketch, To Do, Expense Manager, Reminder, and
Schedule Keeper are at your fingertips throughout the day.
• Secret Drawer
A convenient place to lock up confidential information using a secret password.
• Calendar - Schedule Keeper - Reminder - To Do linking
Reminder and To Do items are automatically displayed in the applicable Schedule Keeper dates. Markers
appear on the Calender display to indicate dates for which Schedule Keeper, Reminder, and To Do items are
scheduled.
• Timepiece with Home Time and World Time
Dual timekeeping lets you keep track of the current time in two different locations.
• Powerful alarm functions
In addition to the standard daily alarm, you can also set alarms for Schedule Keeper, Reminder, and To Do
items.
• Calculator
A 12-digit arithmetic calculator is just the thing for those quick, on-the-go calculations.
• Data Communication
Exchange data with another NX Unit or with a CASIO SF Unit/CSF Unit.

— 2 —
SPECIFICATIONS
Storage Capacity
The 256K (NX-6000) / 128K (NX-4000) bytes memory capacity includes a 245,709 / 114,637-byte user area.
The following shows examples of what this means for the storage of data in each mode.
Telephone Directory
Approximately 11,100 / 5,200, under the following conditions:
8-character name
10-character telephone number
Approximately 5,700 / 2,600, under the following conditions:
8-character name
10-character telephone number
20-character address
Business Card Directory
Approximately 2,900 / 1,300, under the following conditions:
10-character employer name
8-character personal name
10-character telephone number
10-character position
10-character department
20-character address
Memo
Approximately 10,600 / 4,900, 20-character memos.
Sketch
Approximately 160 / 80
• The number of sketch pages that can be stored varies greatly according to the amount of data included
on each sketch page.
To Do
Approximately 6,100 / 2,800, under the following conditions:
20-character description
Illustration used
Deadline set
Schedule Keeper
Approximately 6,300 / 2,900, under the following conditions:
20-character description
Illustration used
Starting time specified, alarm time set
No sketch page data
Approximately 3,100 / 1,400, under the following conditions:
20-character description
Illustration not used
Starting time specified, no alarm time
One sketch page for every 30 text data items.

— 3 —
Reminder
Approximately 12,200 / 5,700, under the following conditions:
10-character description
Illustration used
Alarm time set
Approximately 14,400 / 6,700, under the following conditions:
10-character description
Illustration not used
No alarm time
Expense Manager
Approximately 7,400 / 3,400, under the following conditions:
10-character description
Expense type and Payment type set
General:
Display element: 21-column ×8-line LCD
Memory capacity: 256 KB (NX-6000), 128 KB (NX-4000)
Main component: LSI
Power supply:
Main: Two AAA-size batteries (Type: R03 (UM-4) or LR03 (AM4))
Back-up: One CR2032 lithium battery
Battery life:
Main: Approximately 110 hours continuous display in Telephone Directory (approximately
200 hours on type LR03 (AM4)); approximately 85 hours repeating one minute of
input and 10 minutes of display in Telephone Directory (approximately 150 hours on
type LR03 (AM4))
Back-up: 5years if main batteries are replaced as soon as they becomes weak. 2 year if dead
main batteries are left in the unit.
Power consumption: 0.1 W
Auto power off: Approximately 6 minutes after last key operation
Operating temperature:0°C ~ 40°C (32°F ~ 104°F)
Dimensions:
Unfolded: 14.7 H ×81.9 W ×225 D mm (9/16" H ×3 1/4" W ×8 7/8" D)
Folded: 15.4 H ×81.9 W ×124 D mm (5/8" H ×3 1/4W ×4 7/8" D)
Weight: 148 g (5.2 oz) including batteries
Current consumption:
Main Battery
ON (MENU): MAX = 3.7 mA, TYP = 3.2 mA
OFF: MAX = 35 µA, TYP = 24 µA
Backup Battery
Back-up: MAX = 10 µA, TYP = 6.3 µA
Voltage detection:
Main battery: 2.5 V ±2.5 % or below
Forced OFF: 2.3 V ±2.5 % or below
Backup battery: 2.6 V ±2.5 % or below

— 4 —
BATTERY REPLACEMENT
1. Switch power off.
2. Slide the battery compartment cover in the direction indicated by the arrow.
3. Slide the battery switch in the direction indicated by the arrow in the illustration.
4. Remove the main battery holder.
5. Remove both old batteries and replace them with two new ones.
• Make sure that the positive (+) and negative (–) ends of the
batteries are facing correctly.
6. Replace the main battery holder, and slide the battery switch in the direction
indicated by the arrow in the illustration.
7. Replace the battery compartment cover.
8. Turn on power.
• The Home Time screen always appears whenever you turn power on for the first time after replacing
main batteries.
9. Check the Home Time setting and make changes if necessary.
REPLACING THE BACK-UP BATTERY
Before replacing the back-up battery, note the following precautions:
• Do not remove the back-up battery from the NX Unit while the main batteries are removed.
• Be sure to replace the back-up battery at least once 2 years. Otherwise, you run the risk of losing data
stored in memory.
1. Switch power OFF.
2. Slide the battery compartment cover in the direction indicated by the arrow.
3. Remove the screws that hold the back-up battery holder in place, and remove
the holder.

— 5 —
4. Remove the old battery and replace it with new one, making sure that the positive (+) side of the new battery
is facing up (so you can see it).
5. Replace the back-up battery holder and secure it by tightening its screw.
• Be careful that you do not over tighten the screw.
6. Replace the battery compartment cover.
RESET OPERATION
Youcan use either SECRET RESETorALLRESET to initialize the NX Unit.ALLRESETdeletes all data stored
in memory, while SECRET RESET deletes only the data stored in the secret drawer.
To perform ALL RESET
1. Switch power ON.
2. Open the battery compartment cover.
3. Press the RESET button with a thin, pointed object.
• At this time, the touch panel screen appears.
4. Tap the tip of the pencil icon as each one appears.
• When you tap the fourth pencil icon, the RESET screen appears.
Warning!
The next step deletes all data stored in the NX Unit's memory. Make sure that you really want to delete the
data before you continue!
5. Tap ALL RESET.
Note
• The message “ALL RESET? OK/ESC” always appears in English, regardless of the system language
setting.
6. Tap OK to reset the memory and delete all data or ESC to abort the reset operation without deleting
anything.
• After you tap OK, the system language screen appears.
7. Select the system language by tapping on the language you want to use, and then tap OK.
• After you select the system language, the Home Time screen appears.
8. Check the Home Time setting and make any changes that you want.
RESET button

— 6 —
Following the all reset operation, the NX Unit settings are initialized as noted below.
Home Time: Washington, D.C.
JAN/1/1996 MON
12:00 AM
12-hour format
World Time: New York
Daily Alarm: 12:00 PM
Sound: Schedule alarm, Reminder alarm and To Do alarm — ON
Daily alarm — OFF
Key input tone — ON
Input mode: Overwrite
TO SAVE THE DATA TO ANOTHER UNIT
NX-4000/6000 can transfer customer's data to another NX-4000/6000 with memory protection only when
replacing the LCD or the outer case.
How to transfer the data
1) Make sure that the power of both units is switched off.
2) Remove the covers from the data communications jacks on the two NX units.
3) Connect the two units using the SB-62 cable as shown in the figure below.
4) Turn the power switch of slave units on.
5) Reset the slave unit.
6) The slave unit must be set the date of Feb. 3rd, 1901 into the memory under the calculator mode.
Operation : ON AC 1 DATE 2 DATE 3 DATE M+
If you don't set the date, the "PASSWORD" isn't transferred to the slave unit.
7) Check the hardware parameters, and if the both units have another condition, reset as follows;
Operation : MENU FUNC DATA COM. SET UP PAR. NONE 7 9600 OK
SB-62 cable
PARITY EVEN ODD NONE
BIT LENGT 78
BPS 4800 / 9600
//////////// SET UP PAR. ////////////

— 7 —
RECEIVE OK!
TO STOP
PRESS [ ESC ]
DATA
RECEIVE OK!
TO STOP
PRESS [ ESC ]
DATA
8) Set up the slave unit.
Operation : MENU FUNC DATA COM. RECEIVE
OK ESC
OK ESC
If you can not succeed to transfer the data, press ESC key on both unit and try to transfer the data again
according to the above procedure.
9) Set up the customer's unit.
• Turn the power switch off.
• Press the RESET button with a thin, pointed object while shorting the following pad.
Note: Be careful not to reset the customer's unit. If “DIGITIZER” is displayed, turn the power switch off
immediately, and try again.
10) Start the data communication (slave unit).
Operation : OK
BOTTOM VIEW
Short the pad
Enlarge
RECEIVING
ITEMS 00001
SEND ALL DATA ?
OK ESC

— 8 —
BLOCK DIAGRAM
TAB LSI
uPD3062W
CPU
HD62119A03
Forced off 2.3V
Main battery
Low battery 2.5V
Back uo battery
Low battery 2.6V
Detector : IC7
Detector : IC6
Detector : IC8
Communication Jac
k
AD converter
TC35093
TC74LCX240
TXR
TXL
TYU
TYD Touch PanelLCD
ROM
MB834000CPF-G-4EP
RAM
CXK581000AM

— 9 —
1Y
1A
2A
2Y
2G-
1G-
TC74LCX240
AAAA
AAAA
AAAA
A
A
A
A
A
A
A
A
TOUCH PANEL
Y1 Y2
X2
TYU
TXR
TYD
TXL
X1
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VDD
EOC
DB3
CK
STC
DB4
DB5
NC1
DB6
DB7
OVF
VSS
AIN
DB2
NC2
DB1
DB0
OE
VREF
AGND
IC82 TC35093
ADCH
ADSTOB
ADSTBY
OCLK
VDD CS8B
DB3
DB2
DB1
DB0
DB7
DB6
DB5
DB4
CPU
HD62119A03
KO7(TABYG)
KO8(TABXG)
KO6(TABLUB)
KO5(TABRDB)
TC74HC4066
TOUCH PANEL CIRCUIT
Four electrodes are installed in top and bottom right and left of panel, and the touch panel recognizes the
coordinate which was pushed with a pen on panel by detecting change volume of current which flowed through
panel by pushing panel.
Circuit Operation
TXL and TYU of drive signals are sent through LS240 from CPU by X1,Y1 of touch panel when turn on power
supply. And, TXR,TYD signals are output through LS240 from touch panel to AIN terminal of A/D converter
TC35093, and convert the analog value into digital value, and TC35093 outputs digital data DB0~DB7 of 8 bits
to CPU.
TC35093 changes TXR of X axis signal, TYD of Y axis signal in alternating by analog switch 4066 by ADCH
signal from CPU to output digital data, and input analog data into AIN terminal of TC35093.
Synchronize analog data input from AIN terminal in clock signal of 1 pin, and TC35093 outputs digital data
DB0~DB7 to CPU when OE and STC signal input become H.

— 10 —
Pin No. Pin Name Input / Output Function
1 KO12 O Key common signal
2 KO O Switching signal for Xaxis and Y axis
3 KO10 O Strobe signal for AD converter
4 KO9 O Standby signal for AD converter
5 KO8 O Switching signal for TXR and TXL
6 KO7 O Switching signal for TYU and TYD
7 KO6 O Touch panel driving signal for TXL and TYU
8 KO5 O Touch panel driving signal for TXR and TYD
11 KO2 O Key common signal for TEST pad
12 KO1 O Key common signal for ON key
13, 18 ~ 20 KI8, 3 ~ 1 I Key in signal
21 BUFON O Chip select signal
22, 23 IT2, 1 I Interrupt input
24 ~ 42 AO18 ~ 0 O Address signal
43 OEBO O Output enable
44 WEBO O Write enable signal
45 CS10BO O Address signal (A19)
46 CS9BO O Address signal (A20)
47 CS8BO O Output enable signal
48 CS7BO — Check pad
49 CS6BO O Chip select signal
50 CSB5O O Chip select signal
51 CS4BO O Chip select signal
52 ~ 59 IO7 ~ 0 I/O Data bus
60, 61 OPT3, 2 — Check pad
62 OPT1 O Chip select signal
63 OPT0 — Check pad
64 ~ 71 PORT7 ~ 0 I/O I/O port
72 VSS I GND
73 PI I Ceramic oscillation input
74 PO O Ceramic oscillation output
75 VLC — Power terminal
76 XO O Crystal oscillation output
77 XI I Crystal oscillation input
78 VCC I +3V source
79 VREG2 I Voltage regulator input
80, 81 TS1, TS2 I Test terminal
82 VSSR I GND
83, 84 BZZ1, 2 O Buzzer signal output
85 VSS I GND
86 OCLK O Clock signal output
87 ITOFF I Power off terminal
88 TEMU I Test terminal
89 SW I Reset switch terminal
90 VDB I Back up power terminal
91 ~ 94 VD1 ~ 4 I Power for dubler
95 VREG1 I Regulator power
96 VREG4 I Regulator power
97 VREG5 I Regulator power
98 VDT1I I Voltage detector 2.3V
99 VDT2I I Voltage detector 2.5V
100 VREG3 I Re
g
ulator power
PIN FUNCTION
CPU (HD62119A03)

— 11 —
DIAGNOSTIC PROGRAM
TEST PAD
BOTTOM VIEW
Enlarge
CP55 CP38
To enter the diagnostic program, proceed as follows;
1: Open the battery cover and turn the power switch on.
2: Short the TEST pads CP38 and CP55.
STEP OPERATION DISPLAY NOTE
Enter the
diagnostics Press on and then short the TEST pad. SELF TEST PROG
PRESS any TOUCH
QUIT BY OFF KEY
CASIO JULY 1995
Main menu Tap anywhere TEST MENU
1 DISPLAY
2 MEMORY
3 TIME
4 BUZZER
DIsplay Check 1 DISPLAY DISPLAY
1 DISPLAY
2 FRAME FREQ.
1 DISPLAY No color, no displa
y
Tap an
y
where Oran
g
e color is displa
y
ed
Tap an
y
where Green color is displa
y
ed
Tap an
y
where Blue color is displa
y
ed
Tap an
y
where Checkers are displa
y
ed
Tap an
y
where Reverse checkers are displa
y
ed
Tap an
y
where Frame is displa
y
ed
Tap an
y
where Dots at the 4 corners are displa
y
ed
Tap an
y
where Vertical 4 colors are displa
y
ed
Tap an
y
where Horizontal 4 colors are displa
y
ed
Tap anywhere TEST MENU
1 DISPLAY
2 MEMORY
3 TIME
4 BUZZER
Memory Check 2 MEMORY MEMORY
1 WRITE 1
2 READ 1
3 WRITE 2
4 READ 2
1 WRITE 1 RAM WRITE 1 Write the test pattern 1 into
RAM
MEMORY
1 WRITE 1
2 READ 1
3 WRITE 2
4 READ 2
After 3 sec.
5 I / F
6 CONTRAST
7 TOUCH
8 RESET
5 I / F
6 CONTRAST
7 TOUCH
8 RESET
5 DUMP
6 CHECKSUM
5 DUMP
6 CHECKSUM

— 12 —
STEP OPERATION DISPLAY NOTE
2 READ 1 EXECUTING !! Read the test pattern 1
from RAM
CMPLETE !!
XXXkB
After 3 sec.
NX-4000 : 128kB
NX-6000 : 256kB
Tap anywhere MEMORY
1 WRITE 1
2 READ 1
3 WRITE 2
4 READ 2
3 WRITE 2 RAM WRITE 2 Write the test pattern 2 into
RAM
MEMORY
1 WRITE 1
2 READ 1
3 WRITE 2
4 READ 2
After 3 sec.
4 READ 2 EXECUTING !! Read the test pattern 2
from RAM
CMPLETE !!
XXXkB
After 3 sec.
NX-4000 : 128kB
NX-6000 : 256kB
Tap anywhere MEMORY
1 WRITE 1
2 READ 1
3 WRITE 2
4 READ 2
5 DUMP CHKSUM OS
SUM XXXX Wiring check for ROM
Memory Check Tap anywhere MEMORY
1 WRITE 1
2 READ 1
3 WRITE 2
4 READ 2
6 CHKSUM CHECK SUM
TYPE CS5
SIZE 1024kB
SUM XXXX
EXOR XX
Check SUM value
Tap anywhere MEMORY
1 WRITE 1
2 READ 1
3 WRITE 2
4 READ 2
ESC TEST MENU
1 DISPLAY
2 MEMORY
3 TIME
4 BUZZER
Time Check 3 TIME TIME
00:00:00
ESC TEST MENU
1 DISPLAY
2 MEMORY
3 TIME
4 BUZZER
5 DUMP
6 CHECKSUM
5 DUMP
6 CHECKSUM
5 DUMP
6 CHECKSUM
5 DUMP
6 CHECKSUM
5 DUMP
6 CHECKSUM
5 I / F
6 CONTRAST
7 TOUCH
8 RESET
5 I / F
6 CONTRAST
7 TOUCH
8 RESET

— 13 —
STEP OPERATION DISPLAY NOTE
Buzzer Check 4 BUZZER BZZ
1 BEEP
2 ALARM 1
3 ALARM 2
1 : Key input sound
2 : Sound alarm 1
3 : Sound alarm 2
ESC TEST MENU
1 DISPLAY
2 MEMORY
3 TIME
4 BUZZER
Interface Check 5 I/F I/F
1 TRANS 7
2 RECEIVE N
3 ASCII 9
4 LOOP
The parameter can be
changed
as follows;
"7" : Bit length 7 or 8 bit
"N" : Parity bit N(Non),
E(Even) or O(Odd)
"9" : BPS 9(9600) or
4
(
4800
)
1 TRANS EXECUTING !! Send the code "H"
2 RECEIVE No display Display the received
charactor.
3 ASCII EXECUTING !! Send the ASCII code
4 LOOP EXECUTING !! Loop back check
ESC I/F
1 TRANS 7
2 RECEIVE N
3 ASCII 9
4 LOOP
CONTRAST
ADJ. 6 CONTRAST TEST MENU 1 DISPLAY
2 MEMORY
3 TIME
4 BUZZER
Contrast up : Tap
Contrast down : Tap
CONTRAST
(ORG)
(BLU)
(GRN)
Contrast adjustment
Color up : Tap
Color down : Tap
CONTRAST
(ORG)
(BLU)
(GRN)
Adjust the color using
cursor keys until the
primary colors appear
accurately.
ESC TEST MENU
1 DISPLAY
2 MEMORY
3 TIME
4 BUZZER
INIT
INIT
INIT
5 I / F
6 CONTRAST
7 TOUCH
8 RESET
5 I / F
6 CONTRAST
7 TOUCH
8 RESET
5 I / F
6 CONTRAST
7 TOUCH
8 RESET

— 14 —
STEP OPERATION DISPLAY NOTE
TOUCH PANEL
ADJUSTMENT 7 TOUCH touch TEST 1 ADJUST
2 TEST
1 ADJUST Tap the tip of the pencil
icon.
When you do, the pencil
icon you tapped
disappears, and the next
one appears.
Tap 4 pencil icons.
Tap 4 pencil icons. touch TEST
1 ADJUST
2 TEST
2 TEST Tap 4 pencil icons.
Trace the horizontal black
line and then vertical black
line.
ESC
[OK ]
ESC touch TEST
1 ADJUST
2 TEST
ESC TEST MENU
1 DISPLAY
2 MEMORY
3 TIME
4 BUZZER
Reset 8 RESET MAIN MENU
/////DIGITIZER//////
TAP THE TIP OF THE
PENCIL ICON
/////DIGITIZER//////
TAP THE TIP OF THE
PENCIL ICON
5 I / F
6 CONTRAST
7 TOUCH
8 RESET
CONTRAST ADJUSTMENT
1 : Enter the diagnostic program and tap "6 : CONTRAST".
2 : Look the LCD from heading.
3 : Adjust the volume VR1 on the Z850-1 pcb ass'y.
4 : As to the step of hereafter, refer to "DIAGNOSTIC PROGRAM" mentioned above

— 15 —
MESSAGE TABLE
Message
NOT FOUND!
MEMORY FULL!
ALARM TIME
ALREADY USED!
ALARM TIME
ALREADY
PASSED!
SECRET DATA!
PASSWORD
MISMATCH!
TRANSMIT ERROR!
STOPPED!
NOTICE!
CONSULT THE
OWNER'S MANUAL!
Meaning
Dataspecifiedinsearchoperationdoes
not exist in memory.
Not more room in memory for storage
of data.
Attempt to set a Schedule Keeper,
Reminder or a To Do alarm time that is
already used for another entry.
Attempt to set a Schedule Keeper, a
Reminder or a To Do alarm time for a
time/date that is already passed.
Alarm for a secret memory area data
item is sounding.
Attempt to enter the secret memory
area using a password that does not
match the one preset for the secret
area.
Error during data communications.
Data communication has been inter-
rupted.
• This message appears when this is
the first time you ever turned on the
NX Unit.
• Data corrupted by strong impact,
electrostatic charge, etc.
Action
Changespecificationor cancel search.
Delete unnecessary data items from
memory.
Set a different alarm time or change
the existing alarm time to another one.
Set a different alarm time (for a future
time/date).
Enter the secret memory area to view
details of the alarm.
Use the correct password.
Cancel the data communications op-
eration and try again.
Stop the data communication proce-
dure and try again.
Perform the ALL RESET operation
(“Resetting the NX Unit's Memory” in
Character 1).
See “About the “NOTICE!” message”
in Chapter 1.

— 17 —
SCHEMATIC DIAGRAMS
Z850-1 PCB ASS'Y (MAIN BLOCK)

— 18 —
Z850-1 PCB ASS'Y (A/D BLOCK)

— 19 —
Z850-1 PCB ASS'Y (DISPLAY BLOCK)