IBM MT 2645 Owner's manual

Thank you for purchasing this Factory Service
Manual CD/DVD from servicemanuals4u.com.
Please check out our eBay auctions for more great
deals on Factory Service Manuals:
servicemanuals4u

January 2000
This manual supports:
ThinkPad 600X (MT 2645)
ThinkPad 600X (MT 2646)

Note
Before using this information and the product it
supports, be sure to read the general information
under “Notices” on page 78.
First Edition (January 2000)
The following paragraph does not apply to the United
Kingdom or any country where such provisions are
inconsistent with local law:
INTERNATIONAL BUSINESS MACHINES
CORPORATION PROVIDES THIS PUBLICATION “AS IS”
WITHOUT ANY WARRANTY OF ANY KIND, EITHER
EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED
TO, THE LIMITED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. Some states do not allow disclaimer or
express or implied warranties in certain transactions;
therefore, this statement may not apply to you.
This publication could include technical inaccuracies or
typographical errors. Changes are periodically made to
the information herein; these changes will be incorporated
in new editions of the publication. IBM may make
improvements or changes to the products or the programs
described in this publication at any time.
It is possible that this publication may contain references
to, or information about, IBM products (machines and
programs), programming, or services that are not
announced in your country. Such references or
information must not be construed to mean that IBM
intends to announce such IBM products, programming, or
services in your country.
Requests for technical information about IBM products
should be made to your IBM authorized dealer or your IBM
marketing representative.
 Copyright International Business Machines
Corporation 2000. All rights reserved. Note to U.S.
Government Users – Documentation related to restricted
rights – Use, duplication, or disclosure is subject to
restrictions set forth in GSA ADP Schedule Contract with
IBM Corp.

Contents
Read this first ................... 1
Related service information ............ 3
Reset switch . . . . . . . . . . . . . . . . . 3
Service Web site ............... 3
Passwords . . . . . . . . . . . . . . . . . . 3
Power management features .......... 5
Checkout guide . . . . . . . . . . . . . . . . . . 7
Testing the computer ............. 7
Detecting system information with PC-Doctor . . 9
Power system checkout ............ 9
Port replicator checkout ............ 12
Product overview . . . . . . . . . . . . . . . . . 13
Features . . . . . . . . . . . . . . . . . . . 13
Status indicators . . . . . . . . . . . . . . . . 15
Fn key combinations .............. 16
Symptom-to-FRU error messages ......... 17
How to use error messages .......... 17
How to diagnose multiple FRUs ........ 17
Symptom-to-FRU index . . . . . . . . . . . . 17
Numeric error codes .............. 18
Beep symptoms . . . . . . . . . . . . . . . . 23
Audio-related symptoms . . . . . . . . . . . . 24
CD-ROM-related symptoms . . . . . . . . . . 24
Function-related symptoms . . . . . . . . . . . 27
Indicator-related symptoms . . . . . . . . . . . 27
Infrared-related symptoms . . . . . . . . . . . 28
Keyboard- or TrackPoint-related symptoms . . . 28
LCD-related symptoms . . . . . . . . . . . . . 29
Modem-related symptoms . . . . . . . . . . . 29
PC Card-related symptoms ........... 30
Peripheral-device-related symptoms . . . . . . . 30
Power-related symptoms . . . . . . . . . . . . 31
Other symptoms . . . . . . . . . . . . . . . . 31
Intermittent problems . . . . . . . . . . . . . . 31
Undetermined problems . . . . . . . . . . . . 31
FRU replacement notices ............. 33
Screw notices . . . . . . . . . . . . . . . . . 33
Retaining serial numbers ............ 34
FRU removals and replacements ......... 36
1010 Backup battery . . . . . . . . . . . . . 38
1020 DIMM . . . . . . . . . . . . . . . . . . 39
1025 Modem card . . . . . . . . . . . . . . . 40
1030 Battery pack . . . . . . . . . . . . . . . 41
1040 Hard disk drive ............. 42
1050 UltraslimBay device . . . . . . . . . . . 43
1060 Keyboard assembly . . . . . . . . . . . 44
1070 Keyboard . . . . . . . . . . . . . . . . 47
1080 Speakers . . . . . . . . . . . . . . . . 48
1085 Speaker cable . . . . . . . . . . . . . . 50
1090 LCD assembly . . . . . . . . . . . . . . 51
 Copyright IBM Corp. 2000 iii

1100 PC Card slot assembly .......... 52
1110 Asset ID RF adapter kit ......... 53
1120 Sub card . . . . . . . . . . . . . . . . 54
1130 Guide rail, microphone cable, or TV Out card 55
1140 CPU card and fan ............ 56
1150 Modem cable assembly ......... 58
1160 System board . . . . . . . . . . . . . . 60
2010 LCD front cover ............. 61
2020 LCD Hinges and cables ......... 62
2030 Inverter card . . . . . . . . . . . . . . 64
Locations . . . . . . . . . . . . . . . . . . . . . 65
Front view . . . . . . . . . . . . . . . . . . . 65
Rear view . . . . . . . . . . . . . . . . . . . 66
Bottom view . . . . . . . . . . . . . . . . . . 67
Password pads . . . . . . . . . . . . . . . . 68
Parts list . . . . . . . . . . . . . . . . . . . . . 69
Keyboard . . . . . . . . . . . . . . . . . . . 72
LCDFRU . . . . . . . . . . . . . . . . . . . 73
Common Parts List .............. 76
Notices . . . . . . . . . . . . . . . . . . . . . . 78
Trademarks . . . . . . . . . . . . . . . . . . 78
iv ThinkPad 600X Hardware Maintenance Manual

Read this first
Read this first
Before you go to the checkout guide, be sure to read this
section.
Important notes
Only certified trained personnel should
service the computer.
Read the entire FRU removal and replacement
page before replacing any FRU.
Use new nylon-coated screws when you
replace FRUs.
Be extremely careful during such write
operations as copying, saving, or formatting.
Drives in the computer that you are servicing
might have been rearranged, or the drive startup
sequence might have been altered. If you select
an incorrect drive, data or programs might be
overwritten.
Replace FRUs only for the correct model.
When you replace a FRU, make sure the model
of the machine and the FRU part number are
correct by referring to the FRU parts list.
A FRU should not be replaced because of a
single, unreproducible failure. Single failures
can occur for a variety of reasons that have
nothing to do with a hardware defect, such as
cosmic radiation, electrostatic discharge, or
software errors. Consider replacing a FRU only
when a problem recurs. If this is suspected,
clear the error log and run the test again. Do not
replace any FRUs if log errors do not reappear.
Be careful not to replace a nondefective FRU.
What to do first: When you do return a FRU, you
must include the following information in the parts
exchange form or parts return form that you attach to it:
1. Name and phone number of servicer
2. Date of service
3. Date on which the machine failed
4. Date of purchase
5. Failure symptoms, error codes appearing on the
display, and beep symptoms
6. Procedure index and page number in which the
failing FRU was detected
7. Failing FRU name and part number
8. Machine type, model number, and serial number
9. Customer's name and address
Before checking problems with the computer, determine
whether the damage is covered under the warranty by
referring to the following:
1

Read this first
Note for warranty: During the warranty period, the
customer may be responsible for repair costs if the
computer damage was caused by misuse,
accident, modification, unsuitable physical or
operating environment, or improper maintenance by
the customer. The following list provides some
common items that are not covered under warranty
and some symptoms that might indicate that the
system was subjected to stress beyond normal
use.
The following is not covered under warranty:
LCD panel cracked from the application of
excessive force or from being dropped.
Scratched (cosmetic) parts.
Cracked or broken plastic parts, broken latches,
broken pins, or broken connectors caused by
excessive force.
Damage caused by liquid spilled into the system.
Damage caused by the improper insertion of a
PC Card or the installation of an incompatible
card.
Damage caused by foreign material in the
diskette drive.
Diskette drive damage caused by pressure on
the diskette drive cover or by the insertion of a
diskette with multiple labels.
Damaged or bent diskette eject button.
Fuses blown by attachment of a nonsupported
device.
Forgotten computer password (making the
computer unusable).
The following symptoms might indicate damage
caused by nonwarranted activities:
Missing parts might be a symptom of
unauthorized service or modification.
HDD spindles can become noisy from being
subjected to excessive force or from being
dropped.
I9990303 errors can be caused by exposure to
strong magnetic fields.
2ThinkPad 600X Hardware Maintenance Manual

Related service information
Related service information
This section provides information about the following:
“Reset switch”
“Service Web site”
“Passwords”
Power management features
Reset switch
The Reset switch resets the system (regardless of the
microcode status) and forces the power off. Use this
pushbutton to power off when power is not completely off
or the microcode is in a hung state. For its location, see
“Rear view” on page 66.
Service Web site
When the latest maintenance diskette and the system
program service diskette are available, a notice will be
posted on http://pccbbs.raleigh.ibm.com/
Passwords
As many as three passwords may be needed for any
ThinkPad computers: the power-on password (POP), the
hard disk password (HDP), and the supervisor password
(PAP).
When the power-on password (POP), the hard disk
password (HDP), or the supervisor password (PAP) is
used, the following situations may occur:
If the PAP is used, the HDP is enabled automatically, but
no HDP prompt appears. The HDP is set the same as the
PAP.
 If the POP is the same as the HDP , the POP
prompt appears, but the HDP prompt does not
appear.
 If the POP is not the same as the HDP , both
prompts appear.
If a ThinkPad computer has an extra bay, it can support
more than two HDPs. Then the following situations will
occure:
If the
POP is the same as one of the HDPs (HDP-1
or HDP-2), a POP prompt appears. The passwords
are different.
If the POP is not the same as either of the HDPs
(HDP-1 or HDP-2), both prompts appear.
If the PAP is used, the HDP-1 or the HDP-2 is
automatically enabled, but the HDP prompt does not
appear. The HDP-1 or the HDP-2 are then set to the
same password as the PAP.
3

Related service information
Supervisor and hard disk passwords: The
supervisor password (PAP) and the hard disk password
(HDP) are security features that are used to protect the
system and the hard disk data from unauthorized access.
No overriding capability is provided. If only a hard disk
password is set, you must get the password from its owner
in order to run diagnostic tests and perform service. If
both the supervisor password and the hard disk password
are set, you can enter Easy-Setup by pressing the Enter
key or by entering the power-on password at the
supervisor password prompt. In this case, the Password,
Start up, Network, and Initialize or Asset ID (for some
models) icons cannot be selected.
Note: The supervisor password and the hard disk
password cannot be replaced if they are forgotten.
If the customer forgets the supervisor password,
the system board must be replaced. If the
customer forgets the hard disk password, the hard
disk drive must be replaced.
How to remove the power-on passwords:
If only the power-on password is set, do the following to
remove it:
1. Turn off the computer.
2. Remove the DIMM cover from the bottom of the
computer.
3. Short-circuit the two password pads or put the jumper
on the pins.
For the location of the password pads or the jumper,
see “Password pads” on page 68.
4. Turn on the computer and wait until the POST ends.
After the POST ends, the password prompt does not
appear. The power-on password has been removed.
5. Reinstall the DIMM cover.
If both the power-on password and the supervisor
password are set, do the following to remove them:
1. Power on the computer by pressing and holding F1.
2. Enter the supervisor password. The Easy-Setup
menu appears.
3. Click the Password icon.
4. Click the Power on icon.
5. Enter the supervisor password, and press the Space
bar.
6. Press Enter twice.
7. Click Exit; then click Restart.
The power-on password has been removed.
4ThinkPad 600X Hardware Maintenance Manual

Related service information
Power management features
To reduce power consumption, the computer has three
power management modes: standby, suspend, and
hibernation.
Standby mode: In standby mode, the following
occurs:
The LCD backlight turns off.
The hard disk drive motor stops.
The speaker is muted.
Note: Standby mode in Windows 98 is called
suspend
mode in Windows 95.
To enter standby mode, press Fn + F3. To end standby
mode and resume normal operation, press any key.
Suspend mode: When the computer enters suspend
mode, the following events occur in addition to what occurs
in standby mode:
The LCD is powered off.
The hard disk drive is powered off.
The CPU stops.
Suspend mode in Windows 95 is called
standby mode in
Windows 98.
You can cause the computer to enter suspend mode by
doing any of the following:
Press Fn + F4.
Close the LCD cover. (To prevent the computer from
entering suspend mode when the LCD is closed, click
Will not suspend even if LCD is closed in the
Power Management Properties window. Then only
the LCD turns off.)
Select the Suspend button in the Fuel Gauge
program.
In certain circumstances, the computer goes into suspend
mode automatically:
If a “suspend time” has been set on the timer, and the
user does not do any operation with the keyboard, the
TrackPoint, the hard disk, the parallel connector, or
the diskette drive within the time set.
If the ac adapter is plugged in.
If the battery indicator blinks orange, indicating that
the battery power is low. (Alternatively, if Hibernate
when battery becomes low has been selected in the
“Power Management Properties” window, the
computer goes into hibernation mode.)
Note: Even if you don't set the low-battery alarm, the
charge indicator lets you know that the battery is
low, and then the ThinkPad automatically enters
the power-saving mode. This default low-battery
5

Related service information
behavior is independent of the operating system.
So, if you have set the low-battery alarm, the
computer may not do what you specified. It
chooses either your setting or the default setting,
whichever is appropriate.
Any one of the following events causes the computer to
resume operation from suspend mode:
The Fn key is pressed.
The LCD cover is opened.
The ring indicator (RI) is signaled by a serial device
or a PC Card device.
The power switch is turned on.
The resume timer is set. In Windows 98, the
Scheduled Tasks setting has priority over the
Resume on timer selection in the “Power
Management Properties” window.
Note: The computer does not accept any input
immediately after it enters suspend mode.
Therefore, wait a few seconds before taking
any action to reenter operation mode.
Hibernation mode
Note for the Windows NT
A Windows NT user cannot create a hibernation file in
a Windows NT system that uses the NTFS format
system, the Windows NT default format. If you want
to use hibernation mode, you should reinstall Windows
NT with a FAT format system.
In hibernation mode, the following occurs:
The system status, RAM, VRAM, and setup data are
stored on the hard disk.
The system is powered off.
Notes
1. In the ThinkPad Configuration program, the
computer can be set to suspend/hibernate
while docked.
2. The computer cannot enter hibernation mode
when it is powered with ac power and a
communication PC Card is used.
Any one of the following events causes the computer to
enter hibernation mode:
The Fn + F12 keys are pressed.
The Hibernation button is selected in the Fuel-Gauge
program.
The power switch is turned off and the mode is set to
Power switch mode [Hibernation].
6ThinkPad 600X Hardware Maintenance Manual

Checkout guide
The timer conditions are satisfied in suspend mode
(for operating systems other than Windows 98).
A critically low battery condition occurs and mode is
set to Hibernate when battery becomes low.
When the power is turned on, the computer leaves
hibernation mode and resumes operation. The hibernation
file in the boot record on the hard disk drive is read, and
system status is restored from the hard disk drive.
Checkout guide
Use the following procedures as a guide in identifying and
correcting problems with the ThinkPad computer.
Note: The diagnostic tests are intended to test only IBM
products. The use of non-IBM products, prototype
cards, or modified options can lead to false
indications of errors and invalid system responses.
1. Identify the failing symptoms in as much detail as
possible.
2. Verify the symptoms. Try to re-create the failure by
running the diagnostic test or by repeating the
operation.
Testing the computer
The ThinkPad computer has a test program called
PC-Doctor DOS (hereafter called PC-Doctor ). You can
detect errors by running the diagnostics test included in
PC-Doctor. This section is an overview of the procedure.
For details that depend on model-unique functions, refer to
“Product overview” on page 13.
For some possible configurations of the computer,
PC-Doctor might not run correctly. To avoid this problem,
you need to initialize the computer setup by Easy-Setup
before you run PC-Doctor. In the Easy-Setup screen, click
Config and Initialize.
Note: When you initialize the computer configuration,
some devices are disabled, such as the serial port.
If you test one of these devices, you need to
enable it by using PS2.EXE.
PC-Doctor does not support the test for the device in the
SelectaDock docking station.
You can test the device in the docking station with an
advanced test in Easy-Setup that is supported by the
ThinkPad 600, 600E, or 770x series.
To run such a test,
Remove a device from the bay of the docking station
and install it in the bay of the 600 or 600E computer.
Then start Easy-Setup.
7

Checkout guide
Dock the 770 series computer to the docking station.
Then start Easy-Setup.
To run the test, do as follows:
Note: In the following procedure, you can select an item
not only with the arrow keys, but also with the
TrackPoint. Instead of pressing Enter, click the left
button.
1. Insert the PC-Doctor disk into the diskette drive; then
power on the computer.
If the computer cannot be powered on, go to “Power
system checkout” on page 9, and check the power
sources.
If an error code appears, go to “Symptom-to-FRU
error messages” on page 17.
In the first screen, select the model and press Enter.
Follow the instructions on the screen.
2. The PC-Doctor main panel appears.
3. Select Diagnostics with the arrow keys, and press
Enter.
A pull-down menu appears. (Its exact form depends
on the model.)
The options on the test menu are as follows:
Diagnostics Interactive Tests
Run Normal Test
Run Quick Test
CPU/Coprocessor
Systemboard
Video Adapter
Serial Ports
Fixed Disks
Diskette Drives
Other Devices
Memory Test – Full
Memory Test –
Quick
Keyboard
Video
Internal Speaker
Mouse
Joystick
Diskette
System Load
CD-ROM/DVD
Stereo Speaker
Notes:
In the Keyboard test in Interactive Tests, the
Fn key is scanned only once. Each key should
be held down for at least 2 seconds; otherwise, it
cannot be sensed.
Sound Card is not recognized in the Hardware
Info.
8ThinkPad 600X Hardware Maintenance Manual

Checkout guide
4. Run the applicable function test.
5. Follow the instructions on the screen. If there is a
problem, PC-Doctor shows some messages.
6. To exit the test, select Quit — Exit Diag.
To cancel the test, press Esc.
Detecting system information with
PC-Doctor
PC-Doctor can detect the following system information:
Hardware Info:
System Configuration
Memory Contents
Physical Disk Driver
Logical Disk Driver
VGA Information
IDE Drive Info
PCI Information
PNPISA Info
SMBIOS Info
FRU Info
Utility:
Run External Tests
Surface Scan Hard Disk
Benchmark System
DOS Shell
Tech Support Form
Battery Rundown
View Test Log
Print Log
Save Log
Full Erase Hard Drive
Quick Erase Hard Drive
Power system checkout
To verify the symptom of a problem, do the following:
1. Power off the computer.
2. Remove the battery pack.
3. Connect the ac adapter.
9

Checkout guide
4. Check that power is supplied when you power on the
computer.
5. Power off the computer.
6. Disconnect the ac adapter and install the charged
battery pack.
7. Check that power is supplied by the battery pack
when you power on the computer.
If you suspect a power problem, see the appropriate one
of the following power supply checkouts:
“Checking the ac adapter”
“Checking operational charging”
“Checking the battery pack” on page 11
“Checking the backup battery” on page 12
Checking the ac adapter: You are here because
the computer fails only when the ac adapter is used:
If the power problem occurs only when the port
replicator is used, replace the port replicator.
If the power-on indicator does not turn on, check the
power cord of the ac adapter for correct continuity
and installation.
If the computer does not charge during operation, go
to “Checking operational charging.”
1. Unplug the ac adapter cable from the computer and
measure the output voltage at the plug of the ac
adapter cable. See the following figure:
(16 - 10 V)
If the voltage is not correct, replace the ac adapter.
If the voltage is acceptable, do the following:
Replace the system board.
If the problem persists, go to “Product overview”
on page 13.
Note: Noise from the ac adapter does not always indicate
a defect.
Checking operational charging: To check
operational charging, use a discharged battery pack or a
battery pack that has less than 50% of the total power
remaining when installed in the computer.
Pin Voltage (V dc)
1+15.5 to +17.0
2 Ground
10 ThinkPad 600X Hardware Maintenance Manual

Checkout guide
Perform operational charging. If the battery status
indicator or icon does not turn on, remove the battery pack
and let it return to room temperature. Reinstall the battery
pack. If the charge indicator or icon still does not turn on,
replace the battery pack.
If the charge indicator still does not turn on, replace the
system board. Then reinstall the battery pack. If the
reinstalled battery pack is not charged, go to the next
section.
Checking the battery pack: Battery charging
does not start until the Fuel Gauge shows that less than
95% of the total power remains; under this condition the
battery pack can charge to 100% of its capacity. This
protects the battery pack from being overcharged or from
having a shortened life.
Note: The battery pack might not be able to charge when
it is hot. In that case, remove it from the computer
and leave it at room temperature for a while. After
it cools down, reinstall and recharge it.
Do the following:
1. Power off the computer.
2. Remove the battery pack and measure the voltage
between battery terminals 1 (+) and 4 (−). See the
following figure:
3. If the voltage is less than +11.0 V dc, the battery pack
has been discharged. Recharge the battery pack.
Note: It takes at least 3 hours to recharge the
battery pack.
If the voltage is still less than +11.0 V dc after
recharging, replace the battery.
4. If the voltage is more than +11.0 V dc, measure the
resistance between battery terminals 3 and 4. The
resistance must be 4 to 30 K ohm.
If the resistance is not correct, replace the battery
pack. If the resistance is correct, replace the system
board.
Terminal Voltage (V dc)
1+ 0 to + 12.6
4Ground (−)
11

Checkout guide
Checking the backup battery: Do the following:
1. Power off the computer, and unplug the ac adapter
from it.
2. Turn the computer upside down.
3. Remove the backup battery
Note: Removing the backup battery will cause loss
of configuration data unless the battery pack
is installed and operational.
(see “Checking the battery pack” on page 11).
4. Measure the voltage of the backup battery. See the
following figure.
If the voltage is correct, replace the system board.
If the voltage is not correct, replace the backup
battery.
If the backup battery discharges quickly after
replacement, replace the system board.
Wire Voltage (V dc)
Red +2.5 to +3.2
Black Ground
Port replicator checkout
Use the following procedure to isolate a port replicator
problem. The port replicator attaches to the system
expansion connector at the rear of the computer:
1. Power off the computer.
2. Remove the failing devices from the port replicator.
3. Unplug the AC Adapter from the port replicator, if it is
attached.
4. Remove the port replicator from the computer.
5. Reconnect the failing device directly to the computer.
(If another device is already connected to the
computer, remove it first.)
6. Go to “Testing the computer” on page 7 and run the
diagnostics.
7. If the advanced diagnostic device test does not find
an error, suspect a problem with the port replicator.
8. Power off the computer, and reconnect the port
replicator.
9. Power on the computer, and run the following
advanced diagnostic tests:
Serial port test with the wrap plug installed on
the port replicator
12 ThinkPad 600X Hardware Maintenance Manual

Product overview
Universal serial bus test with the USB parallel
test cable
Parallel port test with the wrap plug installed on
the port replicator
10. If diagnostic errors appear, replace the port replicator
or the diskette drive. If the problem remains after the
replacement, replace the system board.
11. If power problems appear only when the port
replicator is used, replace the port replicator.
Power overload: If power shutdown occurs
intermittently when PC Card devices are used through a
port replicator with PC Card slots, suspect a problem with
over-current. Some PC Card devices use more power; if
the maximum use of each device occurs simultaneously,
the total current will exceed the limit, causing a power
shutdown. Isolate this problem by removing one of the
devices, and using the computer under the same condition.
If a power shutdown occurs, you have found the cause of
the problem. If not, do this procedure for all the other
devices until you determine the cause.
Product overview
This section presents the following product-unique
information:
“Features”
“Status indicators” on page 15
“Fn key combinations” on page 16
Features
The following table is an overview of the system features
of the ThinkPad 600X:
Feature Description
Processor Intel Pentium III 450 MHz, L2
cache
Intel Pentium III 500 MHz, L2
cache
Mobile Pentium III processor at
650 MHz featuring Intel
SpeedStep technology running at
1.6 V
Bus architecture PCI Bus
Memory
(standard) 64 MB (on the system board) and 32 MB in the DIMM slot
Memory (option) 32 MB, 64 MB, or 128 MB DIMM
card (maximum of 320 MB)
CMOS RAM 114 bytes + 4 Kbytes
Video 13.3-inch, 16M colors XGA
(1024×768 resolution) TFT color
LCD
13

Product overview
Feature Description
Diskette drive
(External) 1.44 MB (3-mode), 3.5-inch
Hard disk drive 6.0 GB, 2.5-inch, IDE interface
12.0 GB, 2.5-inch, IDE interface
CD-ROM/DVD
drive 24 x CD-ROM drive DVD drive (6 x DVD)
I/O port External monitor
Headphone
Line-in
Microphone
Mouse
Parallel
Port replicator
Serial
USB
Video output port
Internal modem 56.6 Kbps
Audio 16-bit audio
Internal stereo speaker
Internal microphone
Software control volume
Infrared transfer IrDA 1.1
PCMCIA One Type-III or two Type-II
Ac adapter 56-watt type
14 ThinkPad 600X Hardware Maintenance Manual

Product overview
Status indicators
The system status indicators blink green or orange to show
the status of the computer.
12
3 4 5 6 7
Symbol Color Meaning
.1/Battery Green The battery is fully charged.
Orange The battery is charging.
Blinking
orange The battery needs charging.
.2/Suspend
mode Green Suspend mode.
Blinking
green Entering suspend mode.
.3/Hard disk
in use Orange Data is read from or written to the hard disk drive.
.4/Numeric
lock Green The numeric keypad on the keyboard is enabled.
.5/Caps lock Green Caps Lock mode is enabled.
.6/Scroll lock Green Arrow keys can be used as
screen-scroll function keys.
.7/Power on Green Power on.
15