Casio PA-2400U Troubleshooting guide

Handheld Personal Computer
PA-2400U(PX-686)
R
MAR. 1998
(without price)
PA-2400U

CONTENTS
HARDWARE SPECIFICATIONS -------------------------------------------------------------- 1
General Specifications------------------------------------------------------------------- 1
Electrical Specifications----------------------------------------------------------------- 2
ACCESSORIES ------------------------------------------------------------------------------------ 3
OPTIONS--------------------------------------------------------------------------------------------- 3
GENERAL GUIDE --------------------------------------------------------------------------------- 4
DESKTOP COMPUTER SYSTEM CONFIGURATION ---------------------------------- 6
SETTING UP ---------------------------------------------------------------------------------------- 7
IMPORTANT BATTERY PRECAUTIONS--------------------------------------------------- 8
Replacing the main batteries ---------------------------------------------------------- 8
Replacing the back-up batteries------------------------------------------------------ 9
RESET ---------------------------------------------------------------------------------------------- 11
To reset the CASSIOPEIA------------------------------------------------------------- 11
FULL RESET-------------------------------------------------------------------------------------- 12
To perform a full reset ----------------------------------------------------------------- 12
CONNECTING TO A DESKTOP COMPUTER------------------------------------------- 13
To connect to a desktop computer ------------------------------------------------ 13
REPLACING THE PC CARD ----------------------------------------------------------------- 14
To replace the PC card----------------------------------------------------------------- 14
REPLACING THE COMPACTFLASH CARD -------------------------------------------- 16
To replace the CompactFlash card ------------------------------------------------ 16
CONNECTING TO A PRINTER -------------------------------------------------------------- 17
To connect to a printer----------------------------------------------------------------- 17
TECHNICAL REFERENCE ------------------------------------------------------------------- 18
About CASSIOPEIA standard interfaces ---------------------------------------- 18
MEMORY BACKUP / RESTORE ------------------------------------------------------------ 19
Backup -------------------------------------------------------------------------------------- 19
Restore -------------------------------------------------------------------------------------- 21
BLOCK DIAGRAM ------------------------------------------------------------------------------ 23
DEVICE FEATURES ---------------------------------------------------------------------------- 24
LSI/IC DATA -------------------------------------------------------------------------------------- 26
SH-7093 (CPU / IC1) --------------------------------------------------------------------- 26
MB87A915 (Gate Array/IC3) ---------------------------------------------------------- 29
MC34119 (IC2)----------------------------------------------------------------------------- 34
MAX3241CAI (IC5) ----------------------------------------------------------------------- 34
HN51W16160 ------------------------------------------------------------------------------ 35
RN5VD18CA (IC113) -------------------------------------------------------------------- 35
XC61A Series (IC100 ~ IC103,IC107,IC109,IC110,IC112,IC116) ----------- 35
MAX608 (IC105,IC106)------------------------------------------------------------------ 36
EMI FILTER ARRAY --------------------------------------------------------------------- 36
UPD23C64000LGY----------------------------------------------------------------------- 36

* Windows is a registered trademark of Microsoft Corporation in the U.S.A. and other countries.
* i486DX and Pentium are registered trademarks of Intel Corporation.
POWER SUPPLY CIRCUIT ------------------------------------------------------------------- 37
Primary Circuit---------------------------------------------------------------------------- 37
5 V Circuit ---------------------------------------------------------------------------------- 38
3 V Circuit ---------------------------------------------------------------------------------- 39
PCMCIA Circuit --------------------------------------------------------------------------- 40
LCD power Circuit ----------------------------------------------------------------------- 41
Voltage Line ------------------------------------------------------------------------------- 42
DETECTOR CIRCUIT--------------------------------------------------------------------------- 43
DIAGNOSTIC PROGRAM--------------------------------------------------------------------- 44
Introduction-------------------------------------------------------------------------------- 44
OPERATION CHECK--------------------------------------------------------------------------- 45
Voltage Detectors Check-------------------------------------------------------------- 61
DISASSEMBLY • ASSEMBLY --------------------------------------------------------------- 63
1.Remove dummy card, CF card and stylus.----------------------------------- 63
2.Slide the lever to release position and remove the battery cover
then the main batteries out. ------------------------------------------------------- 63
3.Removal of backup battery. ------------------------------------------------------- 63
4.Removal of MROM ass’y.----------------------------------------------------------- 64
5.Removal of lower case. ------------------------------------------------------------- 65
6.Removal of main PCB.--------------------------------------------------------------- 66
7.Removal of touch panel.------------------------------------------------------------ 67
EXPLOED VIEW --------------------------------------------------------------------------------- 68
PARTS LIST--------------------------------------------------------------------------------------- 69
SCHEMATIC DIAGRAMS --------------------------------------------------------------------- 71
P686-MAIN (MAIN) ----------------------------------------------------------------------- 71
P686-MAIN (POWER SUPPLY) ------------------------------------------------------ 72
P686-MAIN (LCDM I/F)------------------------------------------------------------------ 73
P668-MROM (MASK ROM) ------------------------------------------------------------ 74
P686-LED (LED) -------------------------------------------------------------------------- 75
P686-PWKEY (POWER KEY)--------------------------------------------------------- 76
P686-2KEY (EL. CALB KEY)---------------------------------------------------------- 76
P686-ADP (AC ADAPTOR) ------------------------------------------------------------ 77
P686-3PIN (3PIN I/F)--------------------------------------------------------------------- 77

— 1 —
HARDWARE SPECIFICATIONS
General Specifications
Model: PA-2400U
Display: 480 ×240 dots, FSTN LCD, 4 grayscale monochrome
CPU: SH3
Memory RAM: 8M bytes
ROM: 16M bytes
Speaker: Sound
Interfaces: RS-232C: 115.2K BPS
Data communication jack
PC card slot
CompactFlash card slot
Infrared port (IrDA compatible protocol)
Communication distance: 10 to 70 cm
Maximum Speed: 115.2K BPS
Power Supply: MainPA-2120LIR Rechargeable Battery Pack (lithium ion batteries);
Two AA-size alkaline batteries LR6 (AM3);
AD-F50200 AC Adapter
Back-up
One CR2032 lithium battery,One IVR2430 battery
Power Consumption: 3.3 W
Battery Life: MainRechargeable battery pack: Approximately 15 hours repeating
one minute of input in Word,followed by 10 minutes of display:
Approximately 10 hours (input of 90 characters per minute in Word)
AA-size alkaline batteries: Approximately 25 hours repeating
one minute of input in Word,followed by 10 minutes of display:
Approximately 10 hours (input of 90 characters per minute in Word)
Main battery life is shortened by use of a modem card or PC card.
Back-up
Approximately 5 years when main batteries are replaced immediately after
display of the message: “Your main batteries are running very low on power.
Please change the batteries at your next opportunity.”
Approximately 1 month when no power is supplied from the main batteries.
Operating Temperature: 0 °C to 40 °C (32 °F to 104 °F)
Dimensions (excluding projections):
Folded: 21H ×179W ×107D mm (13/16"H ×7"W ×4-1/4"D)
Weight: 370 g (13.1 oz)
(with PA-2120LI rechargeable battery pack)

— 2 —
No. Length (L) Angle (A)
1 L = 80 cm A = ±15 degree
2 L = 10 cm A = 0 degree
A
L
PA-2400U
PA-2400U
Electrical Specifications
Current Consumption (V-in: 2.6 V ±0.1 V, LCD Contrast VR: MID.):
Main Battery: Diagnostics Program with alkaline batteries
80 MHz: 500 mA or under
Sleep: 50 mA or under
Back-up Battery: Standby: 1.5 mA or under
Voltage Detectors:
VDET1: 2.1 V and under (Low battery message detector for alkaline batteries)
VDET2: 1.6 V and under (Foced power off detector for alkaline batteries)
VDET1R: 3.6 V and under (Low battery message detector for rechargeable battery)
VDET2R: 3.0 V and under (Foced power off detector for rechargeable battery)
VDETS: 2.7 V and under (Low battery message detector for back-up battery)
IrDA:

— 3 —
ACCESSORIES
The stylus is inserted into the CASSIOPEIA.
• Stylus • Dummy Card • RS-232C Cable
The dummy card is inserted in the CASSIOPEIA.
• CD-ROM • Manuals (Hardware Manual, User’s Guide)
OPTIONS
• AC Adapter
• Rechargeable Battery Pack
(PA-2120L1)
*The actual configuration of the AC adapter may differ from that shown in the above illustration.
• Data Communication Cable SB-62
This cable is used to connect a digital camera or other
external equipment to the PA-2400U.
• Dual Battery Charger PA-2040DCHG-E
Note: Optional materials are sold separately.
• I/O BOX PA-2110 IF (MASTER) / I/O BOX PA-2111 IF (SATELLITE)

— 4 —
GENERAL GUIDE
To remove: Pull on the part of the stylus that protrudes from the unit.
To replace: Orient the stylus correctly and slide it into the unit. Press until it clicks into place.
• Backlight button
Toggles the backlight on and off. The
backlight also turns off automatically if
you do not perform any stylus operation
within a certain amount of time. Pressing
this button together with the Software In-
put Panel button displays the calibration
screen.
• Speaker/
Microphone
Outputs alarm
and other sounds
and also picks up
sounds for record-
ing.
• Software Input Panel (SIP) button
Toggles the Software Input Panel on and off. Pressing this button together with the backlight button
displays the calibration screen.
Important
Take care to avoid damaging or losing the stylus.
• Stylus
For performing operations on the
touch screen.
• Protective cover
• Data communication connector
For connection of a digital camera
or other peripheral.
• PC card slot cover
• Card eject button
Use this button to eject a PC card from
the unit.
• Touch panel
Displays text data and operational indicators.
Keys and icons on the display can be tapped
with the stylus to perform various operations.
• Power button
Press to toggle power on and off.
,

— 5 —
• Backup battery
compartment cover
Open to access the back-up
battery compartment cover.
• Battery holder
Holds the main batteries
(two AA-size alkaline).
• Battery holder release
Slide to release the battery holder.
Make sure this release is in the locked
position whenever using the unit.
• CompactFlash card cover
• CompactFlash card eject lever
• CompactFlash card lock switch
Use the above when installing or re-
moving a CompactFlash card.
• Indicator clear button
Turns off the red indicator
and stops the alarm.
Pressing this button turns
on power. Use the Power
button to turn power off.
• Indicator (red)
Lights to indicate an alarm is set.
This indicator is also used to indi-
cate various status of an applica-
tion.
• Charge indicator (green)
Lights to indicate that charging is
being performed.
• AC adapter connector
For connection of the AC adapter.
• RS-232C connector
For connection of an
RS-232C cable.
• Charge terminal
Connects to a terminal in
the Interface Unit for
charging. • Reset button
See page XX.
• Contrast adjustment dial
Rotate to adjust screen
contrast.
• Infrared port

— 6 —
DESKTOP COMPUTER SYSTEM CONFIGURATION
The computer configuration described below is required to support the installer and the software applica-
tions contained on the Microsoft CD-ROM supplied with the CASSIOPEIA.
•Microsoft Windows NT Workstation 4.0 or Windows 95 (U.S. version)
•Desktop computer with a 486/33DX or higher processor (Pentium P90 recommended)
•12 MB of memory for Windows NT Workstation 4.0
8 MB of memory (12 MB recommended) for Windows 95
•Hard disk drive with 10 to 50 MB of available hard disk space (actual requirements will vary based on
selection of features and user’s current system configuration)
•Available 9 pin communications port
•One CD-ROM drive
•VGA or higher-resolution graphics card (Super VGA 256-color recommended)
•Keyboard
•Microsoft Mouse or compatible pointing device
Options for either Windows NT Workstation 4.0 or Windows 95:
•Audio card/speakers for sound
•Microsoft Office 97 or Microsoft Office 95
•Serial or built-in infrared adapter for synchronization
•Modem for remote synchronization
•Ethernet LAN connection for remote synchronization
Important
•If you have a notebook PC with IrDA capabilities or a built-in modem, its COM port may not be set up for
use as a standard serial interface. In such a case, you must change the COM port settings so it can be
used as a standard serial interface. You should also check which COM ports are enabled on a desktop
PC before starting to install Windows CE Services. See the documentation that comes with your PC for
details.

— 7 —
SETTING UP
1. Load the main batteries.
•Be sure to load the main batteries first. The CASSIOPEIA will not operate properly if you load the back-
up batteries first.
•Loading the back-up batteries first can cause the battery go dead very quickly. Replace the back-up
battery whenever the low back-up battery warning message appears on the display.
2. Wait for about five seconds and then turn on the CASSIOPEIA.
•Turning on power causes the CASSIOPEIA display to change in the sequence shown below.
Set up the CASSIOPEIA as described on page 11 of this manual.
3. After setting up the CASSIOPEIA, turn it off.
4. Load the back-up batteries.
•Use the following procedure to replace the rechargeable back-up battery.
1Wipe the surface of the rechargeable back-up battery with a soft, dry cloth, and then load it into the
battery compartment with its positive side facing up (so you can see it).
2Replace the battery holder and secure it in place
with Screw A.
3Replace the sticker.
•See page 9 for details on replacing the primary
battery.
After completing the above procedure, you can transfer any data you have saved on a disk or other
medium into CASSIOPEIA memory.
Important
•You can also find useful information in the H/PC Companion manual.
•The rechargeable battery pack that comes with the CASSIOPEIA is designed to provide the power
required by the CASSIOPEIA itself, the modem card, and any other devices that require large amounts
of power. It also is the most economical way to power the unit and its peripherals. Because of this, use
of the rechargeable battery pack that comes with the CASSIOPEIA is recommended.
•Should the display lock up or go blank at this time, first perform the full reset (page 12). If this does not
correct the problem, remove the main batteries from the CASSIOPEIA and then remove the back-up
battery. Wait for about five minutes, and then perform this procedure again, starting from step 1. Be
sure that the positive (+) and negative (–) poles of the batteries are facing correctly when you reload
them into the CASSIOPEIA.
•If the message “A problem with memory contents has been found, and memory must be initialized...”
appears, perform the full reset operation described on page 12.
•If the images on the display appear dim, adjust the contrast.
•Further information on the above procedures can be found in the H/PC Companion manual in
the section describing system set up in the owner’s manual.
Start up
screen Set up
screens
Rdchageable
back-up
battery
Primary
back-up
battery
A