Casio IT2000 Service Manual
SERVICE MANUAL
INDEX
(without price)
HANDY TERMINAL
IT-2000 (PX-704)
JAN 1998
CONTENTS
1. SPECIFICATIONS ................................................................................................1
1.1 CPU .............................................................................................................1
1.2 Hardware.....................................................................................................1
1.3 Memory .......................................................................................................1
1.4 Touch Panel ................................................................................................1
1.5 Display ........................................................................................................1
1.6 Sound..........................................................................................................1
1.7 Key .............................................................................................................. 1
1.8 Interface ...................................................................................................... 1
1.9 PC card ....................................................................................................... 2
1.10 Power supply..............................................................................................2
1.11 Durability .................................................................................................... 2
2. OPTIONS .............................................................................................................. 3
3. INTERFACE PIN ASSIGNMENT .......................................................................... 5
3.1 8 Pin serial I/F ............................................................................................. 5
3.2 14 Pin serial I/F (RS-232C)......................................................................... 5
3.3 Card I/F........................................................................................................ 6
4. SYSTEM DIAGRAM .............................................................................................8
4.1 System diagram ......................................................................................... 8
4.2 Block diagram ............................................................................................ 9
4.3 PCB diagram ............................................................................................ 10
4.4 Power supply diagram ............................................................................. 11
5. CIRCUIT DESCRIPTION ....................................................................................12
5.1 Memory .....................................................................................................12
5.2 KBC ........................................................................................................... 15
5.3 Communication ........................................................................................ 21
5.4 PC Card .....................................................................................................22
5.5 Power Supply ...........................................................................................24
6. DISASSEMBLY .................................................................................................. 26
6.1 Removal of the main battery and the backup batteries ....................... 26
6.2 Removal of the battery pack cover ........................................................ 26
6.3 Removal of the Lower case block .......................................................... 26
6.4 Removal of SUB ass’y PCB ....................................................................27
6.5 Disassembly of the Middle Case Block ................................................. 27
6.6 Disassembly of Upper Case Block ......................................................... 29
7. DIAGNOSTIC PROGRAM.................................................................................. 30
7.1 General...................................................................................................... 30
7.2 Inspection Detail ...................................................................................... 32
7.3 Special tool ...............................................................................................33
7.4 Diagnostic test ......................................................................................... 35
8. CIRCUIT DIAGRAMS ......................................................................................... 53
8.1 Curcuit diagram INDEX ........................................................................... 53
9. EXPLODED VIEW .............................................................................................. 75
10. PARTS LIST........................................................................................................76
1. SPECIFICATIONS
1.1 CPU CPU: Intel 80486 GX (32 bit)
Clock: 25M Hz
1.2 Hardware Configuration: IBM PC AT Architecture and dedicated hardware
1.3 Memory Main memory:
4MB 16Mbit DRAM × 2
File memory:
0MB (for D10 Model)
4MB 32Mbit NAND Flash × 1 (for D20 Model)
8MB 32Mbit NAND Flash × 2 (for W30, D30P Model)
DOS & BIOS Memory:
1MB 8Mbit Flash E2PROM × 1
MASK ROM:
8MB 64Mbit MASK ROM × 1 (W30 Model only)
Video Memory:
512KB 4Mbit DRAM × 1
HW Window Memory:
32KB 256Kbit SRAM × 1
1.4 Touch Panel Type: Analog Type
Resolution: 192 × 384 dots
1.5 Display LCD Type: FSTN semi-transparent LCD
Resolution: 192 × 384 dots
Back light: EL back light (with auto-off function)
Character type: Alpha-numeric (ANK), user defined characters
Character size:
Normal size 12 dots: 6 × 12 dots
(Alpha-numeric) 16 dots: 8 × 16 dots
24 dots: 12 × 24 dots
Double size 12 dots: 12 × 12 dots
(Kanji) 16 dots: 16 × 16 dots
24 dots: 24 × 24 dots
Contrast:
VGA mode 4 gradation (Internal control 16 gradation)
HW Window 2 gradation
1.6 Sound Sound source: Buzzer
Volume: 4 steps (Max/Mid/Min/Off)
1.7 Key Numeral keys: 11 (Including decimal point)
Function keys: 4 (“–”, “Fn”, “CLR”, “Return”)
1.8 Interface [COM1]:
8 pin serial I/F
Purpose: for connections of BCR, PC
Baud rate: 300 ~ 115,200 bps
Transfer type: Start-stop synchronous transmission
I/F level: SD(1) less than –5.0 V
SD(0) more than +5.0 V
RD(1) less than +0.6 V
RD(0) more than +2.4 V
— 1 —
[COM2]:
14 pin serial I/F (RS-232C)
Purpose: for dedicated peripheral devices only
Baud rate: 300 ~ 115,200 bps
Transfer type: Start-stop synchronous transmission
I/F level: SD(1) less than –5.0 V
SD(0) more than +5.0 V
RD(1) less than +0.6 V
RD(0) more than +2.4 V
Infrared (conforms to IrDA Ver. 1.0)
Purpose: for data transfer to I/O box
Baud rate: 2,400 ~ 115,200 bps
Transfer type: Start-stop synchronous transmission
Transfer distance: 60 cm
Infrared (conforms to IrDA Ver. 1.1)
Purpose: for data transfer to I/O box
Baud rate: 0.576/1.152/4M bps
Transfer type: Flame synchronous transmission
Transfer distance: 60 cm
1.9 PC card Conforms to PCMCIA 2.1 standard
Supply voltage: 3.3 V/5 V
1.10 Power supply Main Battery
Type: Lithium ion battery pack NP-500
Operating duration: 8 hours (Calculate: Display = 1:10, 20 °C, Back light = off)
Sub batteries
Type: Primary: Coin type lithium ion battery CR2032
Secondary: Rechargeable battery IVR2430
Backup duration: 2 weeks
1.11 Durability File memory (NAND Flash):Erasing 500,000 times
Touch panel: 100,000 characters
Back light: 2,500 hours (Half life period)
— 2 —
2. OPTIONS
I/O BOX
Battery pack
• IT-2060IO-E (Satellite I/O BOX)
• IT-2065IO-E (Master I/O BOX)
• DT-9023LI (Lithium ion battery pack)
Charger
Cable
• DT-9021CHG-E (for Lithum ion battery)
• DT-881RSC (MODEM cable between IT-2060/2065IO-
E/9-pin female and PC/25-pin male)
• DT-822RSC (Cross cable between IT-2060IO-E and
PC/25-pin male)
• DT-883RSC (Cross cable between IT-2060IO-E and
PC/25-pin female)
• DT-887AX (Cross cable between IT-2060IO-E and PC/
9-pin female)
• DT-888RSC (Modular cable between IT-2060/2065IO-E
and IT-2060/2065IO-E, 6-pin and 6-pin)
• DT-9689AX (RS-232C 9-pin cable between IT-2000 and
PC)
• SB-751HF (SCSI cable between IT-2065IO-E and PC
:Centro 50-pin full male)
• SB-752HH (SCSI cable between IT-2065IO-E and PC
:Centro 50-pin half male)
• SB-753HP (SCSI cable between IT-2065IO-E and PC
:Pin type half 50-pin male)
— 3 —
Card
Scanner
AC adaptor
Conforms to the PCMCIA 2.1 standard.
• DT-635MC (S-RAM/256 Kbytes)
• DT-636MC (S-RAM/512 Kbytes)
• DT-637MC (S-RAM/1 Mbyte)
• DT-9031BFMC (F-ROM/4 Mbytes)
• DT-9032BFMC (F-ROM/6 Mbytes)
• DT-9033BFMC (F-ROM/10 Mbytes)
• DT-9034BFMC (F-ROM/20 Mbytes)
• DT-9650BCR (Pen type Bar Code Reader with built-in
decoder)
• DT-9656BCR (Touch type Bar Code Reader with builtin decoder)
• DT-825ADP-U (120VAC, for IT-2060IO-E and IT2065IO-E)
• DT-825ADP-G (230VAC, for IT-2060IO-E and IT2065IO-E)
• DT-9020ADP-U (120VAC, for IT-2000)
• DT-9020ADP-G (230VAC, for IT-2000)
— 4 —
3. INTERFACE PIN ASSIGNMENT
3.1 8 Pin serial I/F
876
543
21
PIN No. Signal Name Description
1 SD Send data
2 RD Receive data
3 RS Request to send
4 CS Clear to send
5 VOUT Power
6 GND Ground
7 ER Equipment ready
8 DR Data set ready
3.2 14 Pin serial I/F (RS-232C)
8 9 10 11 12 13 14
1234567
PIN No. Signal Name Description
1 GND Ground
2 GND Ground
3 NC No Connect
4 SD Send data
5 RD Receive data
6 RS Request to send
7 ER Equipment ready
8 CS Clear to send
9 CI Carrier indicater
10 DR Data set ready
11 CD Carrier detect
12 EXSW External Switch
13 V
14 V
H
H
Power
Power
— 5 —
3.3 Card I/F
3.3.1 Memory Card Interface
Memory Card Interface Signals
Pin No. Signal Name I / O Description Pin No. Signal Name I / O Description
1 GND Ground 35 GND Ground
2 D3 I/O Data3 36 CD1# O Card detect1
3 D4 I/O Data4 37 D11 I/O Data11
4 D5 I/O Data5 38 D12 I/O Data12
5 D6 I/O Data6 39 D13 I/O Data13
6 D7 I/O Data7 40 D14 I/O Data14
7 CE1# I Card enable 1 41 D15 I/O Data15
8 A10 I Address10 42 CE2# O Card enable2
9 OE# I Output enable 43 VS1# I 5 V Detect
10 A11 I Address11 44 RFU Reserve
11 A9 I Address9 45 RFU Reserve
12 A8 I Address8 46 A17 I Address17
13 A13 I Address13 47 A18 I Address18
14 A14 I Address14 48 A19 I Address19
15 WE#/PGM I Write enable 49 A20 I Address20
16 RDY/BSY# O Ready/Busy 50 A21 I Address21
17 Vcc Power 51 Vcc Power
18 Vpp1 Programming power1 52 Vpp2 Programming power2
19 A16 I Address16 53 A22 I Address22
20 A15 I Address15 54 A23 I Address23
21 A12 I Address12 55 A24 I Address24
22 A7 I Address7 56 A25 I Address25
23 A6 I Address6 57 RFU Reserve
24 A5 I Address5 58 RESET I Reset
25 A4 I Address4 59 WAIT# O Wait
26 A3 I Address3 60 RFU Reserve
27 A2 I Address2 61 REG# I Atribute memory select
28 A1 I Address1 62 BVD2 O Battery voltage detect2
29 A0 I Address0 63 BVD1 O Battery voltage detect1
30 D0 I / O Data0 64 D8 I/ O Data8
31 D1 I / O Data1 65 D9 I/ O Data9
32 D2 I / O Data2 66 D10 I / O Data10
33 WP O Write protect 67 CD2# O Card detect2
34 GND Ground 68 GND Ground
— 6 —
3.3.2 I/O Card Interface
I/O Card Interface signals
Pin No. Signal Name I / O Description Pin No. Signal Name I / O Description
1 GND Ground 35 GND Ground
2 D3 I/O Data3 36 CD1# Card detect1
3 D4 I/O Data4 37 D11 I/O Data11
4 D5 I/O Data5 38 D12 I/O Data12
5 D6 I/O Data6 39 D13 I/O Data13
6 D7 I/O Data7 40 D14 I/O Data14
7 CE1# I Card enable 1 41 D15 I/O Data15
8 A10 I Address10 42 CE2# I Card enable2
9 OE# I Output enable 43 VS1# O 5 V Detect
10 A11 I Address11 44 IORD# I I/O Read
11 A9 I Address9 45 IOWR# I I/O Write
12 A8 I Address8 46 A17 I Address17
13 A13 I Address13 47 A18 I Address18
14 A14 I Address14 48 A19 I Address19
15 WE#/PGM I Write enable 49 A20 I Address20
16 IRE0# O Interrupt request 50 A21 I Address21
17 V c c Power 51 Vc c Power
18 Vpp1 Programming and 52 Vpp2 Programming and
periferal power1 pelipheral power2
19 A16 I Address16 53 A22 I Address22
20 A15 I Address15 54 A23 I Address23
21 A12 I Address12 55 A24 I Address24
22 A7 I Address7 56 A25 I Address25
23 A6 I Address6 57 RFU Reserve
24 A5 I Address5 58 RESET I Reset
25 A4 I Address4 59 WAIT# O Wait
26 A3 I Address3 60 INPACK# O Inputaknolage
27 A2 I Address2 61 REG# I Atribute memory select
28 A1 I Address1 62 SPKR# O Degital Sound signal
29 A0 I Address0 63 STSCHG# O Card status change
30 D0 I/O Data0 64 D8 I/O Data8
31 D1 I/O Data1 65 D9 I/O Data9
32 D2 I/O Data2 66 D10 I/O Data10
33 IOIS16# O 16bit I/O port 67 CD2# O Card detect2
34 GND Ground 68 GND Ground
— 7 —
4. SYSTEM DIAGRAM
4.1 System diagram
— 8 —
4.2 Block diagram
Battery senser
Tenperature senser
Illuminace senser
— 9 —
— 10 —
4.3 PCB diagram
ILLUMINACE
SENSOR
8 pin I/F
CONNECTOR
RECHARGE PIN
4.4 Power supply diagram
— 11 —
5. CIRCUIT DESCRIPTION
5.1 Memory
5.1.1 Memory map
Memory map of IT-2000 W30 model is shown in Figure 5.1.1.
Figure 5.1.1 Memory map
— 12 —
5.1.2 Memory block diagram
Memory block diagram is shown in Figure 5.1.2.
Figure 5.1.2 Memory block diagram
— 13 —
5.1.3 Serial E2PROM
Password and configurations data of the machine are saved in serial E2PROM.
E2PROM diagram is shown in Figure 5.1.3.
Figure 5.1.3 Serial E2PROM
— 14 —
5.2 KBC
5.2.1 KBC block diagram
Input of matrix key and touch panel, LCD contrast, automatic backlight ON/OFF, VBAT monitoring, and
buzzer are controlled at KBC.
KBC diagram is shown in Figure 5.2.1.
Figure 5.2.1 KBC block diagram
— 15 —
5.2.2 Matrix key
5.2.2.1 Matrix key diagram
Matrix key diagram is shown in Figure 5.2.2.1.
KSENS[2:0] is connected to KEYIN#[2:0] of KBC.
KSCAN[4.0] is connected to a general port of KBC.
Figure 5.2.2.1 Matrix key diagram
— 16 —
5.2.2.2 Key Sequence
Interrupt is occurred by pressing the key.
When KBC acknowledges the interrupt, it starts to scan and ends after all SCANS are done once.
Key sequence diagram is shown in Figure 5.2.2.2.
Figure 5.2.2.2 Key Sequence
— 17 —
5.2.3 LCD Contrast control
LCD contrast is controlled by KBC.
Use a function of KBC, A/D converter to measure the temperature with a temperature sensor. Then give
the measured data (10 bits AD value) to the system. According to the value system returns the contrast
data to KBC.
KBC adjusts LCD contrast by contrast data.
LCD contrast diagram is shown in Figure 5.2.3.1.
LCD contrast adjustment is shown in Figure 5.2.3.2.
Figure 5.2.3.1 LCD Contrast control diagram
Figure 5.2.3.2 LCD contrast adjustment sequence
— 18 —
5.2.4 Backlight Control
Backlight is controlled by KBC.
Measure the amount of light with the light sensor.
When light amount falls below a certain amount backlight turns on. When light amount exceeds a certain
amount backlight turns off.
By having a certain amount of hysteresis it prevents the flickering of the backlight.
Backlight control is shown in Figure 5.2.4.
Figure 5.2.4 Backlight Control
— 19 —
5.2.5 Buzzer Control
KBC controls the volume of the buzzer and the sound of a key click.
Buzzer control diagram is shown in Figure 5.2.5.1.
Buzzer control signal is shown in Chart 5.2.5.2.
Figure 5.2.5.1 Buzzer Control block diagram
Chart 5.2.5.2 Signals controlling buzzer
Signal Function
BZVR0 Controls volume of Buzzer
BZVR1 Controls volume of Buzzer
KEYBZ Controls sound of key click
SYSBZSW Activates system buzzer
SPKR Controls sound of system buzzer
BZ[2:0] Controls volume of Buzzer
BZVR1 BZVR0 Volume
0 0 OFF
0 1 LOW
1 0 Medium
1 1 High
— 20 —
5.3 Communication
Communication block diagram is shown in Figure 5.3.1.
Figure 5.3.1 Communication block diagram
— 21 —
5.4 PC Card
5.4.1 Card power supply circuit
The power supplied to the card is controlled by software.
Card power supply circuit is shown in Figure 5.4.1.
VC5ON, VC3ON, and VCC_SLOT signals control power supply ON/OFF as shown in the diagram.
Figure 5.4.1 Card power supply circuit
— 22 —
5.4.2 Card lock SW
Card lock SW diagram is shown in Figure 5.4.2.
Figure 5.4.2 Card lock SW diagram
— 23 —
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