Hardware Maintenance Manual
Page 1
IBM Mobile Systems ThinkPad Computer Hardware Maintenance Manual April 2002 This manual supports: ThinkPad T20, T21, T22, T23 (MT 2647/2648) ThinkPad Dock (MT 2631)
IBM Mobile Systems ThinkPad Computer Hardware Maintenance Manual April 2002 This manual supports: ThinkPad T20, T21, T22, T23 (MT 2647/2648) ThinkPad Dock (MT 2631)
Hardware Maintenance Manual
Page 3
...manual is intended for IBM ThinkPad T20, T21, T22, T23 (MT2647, 2648), and ThinkPad Dock (MT2631) products. About this manual This manual contains service and reference information for trained service personnel who are familiar with the advanced diagnostic tests to troubleshoot problems effectively. Use this manual along with ThinkPad products. Important This manual...information. Before servicing an IBM ThinkPad product, be sure to review the safety information under "Safety notices: multilingual translations" on page 3, "Safety information" on page 13, and "Laser compliance ...
...manual is intended for IBM ThinkPad T20, T21, T22, T23 (MT2647, 2648), and ThinkPad Dock (MT2631) products. About this manual This manual contains service and reference information for trained service personnel who are familiar with the advanced diagnostic tests to troubleshoot problems effectively. Use this manual along with ThinkPad products. Important This manual...information. Before servicing an IBM ThinkPad product, be sure to review the safety information under "Safety notices: multilingual translations" on page 3, "Safety information" on page 13, and "Laser compliance ...
Hardware Maintenance Manual
Page 5
Contents About this manual iii Introduction 1 Important service information 1 Strategy for replacing FRUs 1 How to use error messages 2 Diskette compatibility matrix 2 Safety notices: multilingual translations 3 Safety information 13 General safety 13 Electrical safety 14 Safety inspection ... Testing the computer 33 Detecting system information with PC-Doctor. . . 34 Power system checkout 35 ThinkPad T20, T21, T22 and T23 series. . . . . 39 Product overview 41 Specifications 43 Status indicators 45 FRU Tests 47 ... pack 60 1020 Backup battery 61 © Copyright IBM Corp. 2002 v
Contents About this manual iii Introduction 1 Important service information 1 Strategy for replacing FRUs 1 How to use error messages 2 Diskette compatibility matrix 2 Safety notices: multilingual translations 3 Safety information 13 General safety 13 Electrical safety 14 Safety inspection ... Testing the computer 33 Detecting system information with PC-Doctor. . . 34 Power system checkout 35 ThinkPad T20, T21, T22 and T23 series. . . . . 39 Product overview 41 Specifications 43 Status indicators 45 FRU Tests 47 ... pack 60 1020 Backup battery 61 © Copyright IBM Corp. 2002 v
Hardware Maintenance Manual
Page 55
...column headed "FRU or action, in the computer. A numeric error is not correct. Note For an IBM device not supported by diagnostic codes in the ThinkPad notebook computers, see the manual for each error detected in sequence 0175 Bad CRC1, stop POST task-The EEPROM checksum is not correct....The access to EEPROM is not described there, go to "Intermittent problems" on page 55. Do not replace a nondefective FRU. ThinkPad T20, T21, T22 and T23 series 49 System board. 0188 Invalid RFID serialization information area or bad CRC2-The EEPROM checksum is not correct. System board. ...
...column headed "FRU or action, in the computer. A numeric error is not correct. Note For an IBM device not supported by diagnostic codes in the ThinkPad notebook computers, see the manual for each error detected in sequence 0175 Bad CRC1, stop POST task-The EEPROM checksum is not correct....The access to EEPROM is not described there, go to "Intermittent problems" on page 55. Do not replace a nondefective FRU. ThinkPad T20, T21, T22 and T23 series 49 System board. 0188 Invalid RFID serialization information area or bad CRC2-The EEPROM checksum is not correct. System board. ...