Lenovo MT 1842 User manual

ThinkPad Computer
Hardware Maintenance Manual
July 2005
This manual supports:
ThinkPad R50e Series
ThinkPad Dock II (MT 2877)
(MT 1834, 1842, 2670)
ThinkPad R52 Series
(MT 1846, 1847, 1848, 1849, 1850,
1858, 1859, 1860, 1861, 1862,
1863, 1870)

Note
Before using this information and the product it
supports, be sure to read the general information
under “Notices” on page 245.
First Edition (July 2005)
©Copyright Lenovo 2005.
Portions ©Copyright International Business Machines
Corporation 2005.
All rights reserved.
U.S. GOVERNMENT USERS –RESTRICTED RIGHTS:
Our products and/or services are provided with
RESTRICTED RIGHTS. Use, duplication or disclosure by
the Government is subject to the GSA ADP Schedule
contract with Lenovo Group Limited, if any, or the standard
terms of this commercial license, or if the agency is unable
to accept this Program under these terms, then we provide
this Program under the provisions set forth in Commercial
Computer Software–Restricted Rights at FAR 52.227-19,
when applicable, or under Rights in Data-General, FAR
52.227.14 (Alternate III).

Contents
About this manual ...........1
Introduction .............3
Important service information .........3
Strategy for replacing FRUs .........3
Strategy for replacing ahard disk drive .....4
How to use error messages ........4
Strategy for replacing FRUs for CTO, CMV, and GAV 4
Product definition ...........4
FRU identification for CTO, CMV, and GAV products 5
Important information about replacing RoHS compliant
FRUs ...............7
Diskette compatibility matrix .........8
Safety notices: multilingual translations ......8
Safety information............20
General safety ............20
Electrical safety ...........21
Safety inspection guide .........23
Handling devices that are sensitive to electrostatic
discharge ............24
Grounding requirements .........25
Laser compliance statement.........26
General descriptions ..........29
Read this first .............29
What to do first ...........29
Related service information .........31
Service Web site ...........31
Restoring the pre-installed system ......31
Passwords .............32
Power management ..........35
Checkout guide ............38
Testing the computer ..........38
Detecting system information with PC-Doctor...41
Power system checkout .........41
ThinkPad R50e and R52 Series .......45
Product overview ............47
Specifications ............47
Status indicators ...........52
FRU tests .............55
Fn key combinations ..........57
Symptom-to-FRU index ..........59
Numeric error codes ..........59
Error messages ...........63
Beep symptoms ...........64
No-beep symptoms ..........64
LCD-related symptoms .........65
Intermittent problems ..........66
Undetermined problems .........66
©Lenovo 2005. Portions ©IBM Corp. 2005. iii

FRU replacement notices .........67
Screw notices ............67
Retaining serial numbers.........68
Removing and replacing aFRU........71
1010 Battery pack...........72
1020 Ultrabay Enhanced device (for R52 series) 73
1030 Hard disk drive ..........75
1040 DIMM (optional) .........77
1050 Keyboard ...........78
1060 Ultrabay device (for R50e series) ....82
1070 DIMM (standard) .........83
1080 Modem daughter card (MDC-2) .....84
1090 Bluetooth/Modem daughter card (BMDC-3)
(for R52 series) ..........86
1100 Keyboard bezel ..........88
1110 Touch pad and Fingerprint reader (for R52
series) .............92
1120 Mini PCI adapter .........95
1130 Fan assembly ..........99
1140 CPU............. 100
1150 Backup battery ......... 101
1160 Speaker assembly ........ 102
1170 IEEE 1394 (for R52 series) ...... 104
1180 PC Card slot assembly ....... 107
1190 Ultrabay Enhanced shield kit .....110
1200 LCD assembly..........117
1210 VGA and Ultrabay Enhanced device eject
button cable ........... 121
1220 System board, interposer card, and base
cover ............. 124
2010 LCD front bezel ......... 131
2020 Inverter card .......... 133
2030 LCD panel, LCD cable assembly, wireless
LAN antenna assembly, hinges, and LCD cover. 134
3010 ThinkPad Dock II PCI cover...... 145
3020 ThinkPad Dock II top cover ...... 146
Locations .............. 149
Front view (for R50e) ......... 149
Rear view (for R50e) ......... 150
Bottom view (for R50e) ......... 151
Front view (for R52) .......... 152
Rear view (for R52) .......... 154
Bottom view (for R52) ......... 155
Parts list .............. 156
Overall ............. 156
LCD FRUs ............ 209
AC adapters ............ 225
Keyboard ............. 226
Recovery CDs ........... 228
Miscellaneous parts .......... 235
Optional FRUs ........... 241
Common parts list .......... 242
Notices .............. 245
iv R50e and R52 Series

Trademarks ............. 247
Contents v

vi R50e and R52 Series

About this manual
This manual contains service and reference information for
ThinkPad R50e series (MT 1834, 1842, 2670), R52 series
(MT 1846, 1847, 1848, 1850, 1858, 1859, 1860, 1861,
1862, 1863, 1870), and ThinkPad Dock II (MT2877)
products. Use this manual along with the advanced
diagnostic tests to troubleshoot problems.
Note
MT 1850, 1862, 1863, and 1870 are special bids.
For information on how to locate service parts, refer
to “Strategy for replacing FRUs for CTO, CMV, and
GAV” on page 4.
The manual is divided into sections as follows:
vThe common sections provide general information,
guidelines, and safety information required in servicing
computers.
vThe product-specific section includes service, reference,
and product-specific parts information.
Important
This manual is intended for trained service
personnel who are familiar with ThinkPad products.
Use this manual along with the advanced diagnostic
tests to troubleshoot problems effectively.
Before servicing aThinkPad product, be sure to
review the safety information under “Safety notices:
multilingual translations” on page 8, “Safety
information” on page 20, and “Laser compliance
statement” on page 26.
©Lenovo 2005. Portions ©IBM Corp. 2005. 1

2R50e and R52 Series

Introduction
Important service information
Important
BIOS and device driver fixes are
customer-installable. The BIOS and device drivers
are posted on the customer support site
http://www.lenovo.com/think/ support
Advise customers to contact the Customer Support
Center at 800-426-7378 if they need assistance in
obtaining or installing any diskette fixes.
Customers in Canada should call the Customer
Support Center at 800-565-3344 for assistance or
download information.
Strategy for replacing FRUs
Before replacing parts
Make sure that all diskette fixes are installed before
replacing any FRUs listed in this manual.
Use the following strategy to prevent unnecessary expense
for replacing and servicing FRUs:
vIf you are instructed to replace aFRU but the
replacement does not correct the problem, reinstall
the original FRU before you continue.
vSome computers have both aprocessor board and a
system board. If you are instructed to replace either the
processor board or the system board, and replacing one
of them does not correct the problem, reinstall that
board, and then replace the other one.
vIf an adapter or adevice consists of more than one
FRU, any of the FRUs may be the cause of the error.
Before replacing the adapter or device, remove the
FRUs, one by one, to see if the symptoms change.
Replace only the FRU that changed the symptoms.
Attention: The setup configuration on the computer you
are servicing may have been customized. Running
Automatic Configuration may alter the settings. Note the
current configuration settings (using the View Configuration
option); then, when service has been completed, verify that
those settings remain in effect.
©Lenovo 2005. Portions ©IBM Corp. 2005. 3

Strategy for replacing ahard disk drive
Always try to run alow-level format before replacing ahard
disk drive.
Attention: The drive startup sequence in the computer
you are servicing may have been changed. Be extremely
careful during write operations such as copying, saving, or
formatting. If you select an incorrect drive, data or
programs can be overwritten.
How to use error messages
Use the error codes displayed on the screen to diagnose
failures. If more than one error code is displayed, begin the
diagnosis with the first error code. Whatever causes the
first error code may also cause false error codes. If no
error code is displayed, see whether the error symptom is
listed in the Symptom-to-FRU Index for the computer you
are servicing.
Strategy for replacing FRUs for CTO,
CMV, and GAV
Product definition
Dynamic Configure To Order (CTO)
This provides the ability for acustomer to configure an
IBM
® solution from an eSite, and have this configuration
sent to fulfillment, where it is built and shipped directly to
the customer. The machine label, PC Entitlement
Warehouse (PEW), eSupport, and the HMM will load these
products as the 4-digit MT and 3-digit model, where model
=“CTO” (Example: 1829-CTO).
Custom Model Variant (CMV)
This is aunique configuration that has been negotiated
between IBM and the customer. Aunique 4-digit MT and
3-digit model is provided to the customer to place orders
(Example: 1829-W15). ACMV is aspecial bid offering.
Therefore, it is NOT generally announced.
vThe MTM portion of the machine label is the 4-digit MT
and 3-digit model, where model =“CTO” (Example:
1829-CTO). The PRODUCT ID portion of the machine
label is the 4-digit MT and 3-digit CMV model (Example:
1829-W15).
vThe PEW record is the 4-digit MT and 3-digit model,
where model =“CTO” (Example: 1829-CTO).
veSupport will show both the CTO and CMV machine
type models (Example: 1829-CTO and 1829-W15 will be
found on the eSupport site.)
Important service information
4R50e and R52 Series