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Overview, Replacement Procedures, Before You Begin

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4.1 Overview 4 Replacement Procedures Before You Begin Take note of the following points before starting work. Always remove the AC adapter and battery pack before commencing any of the procedures. The procedure for removing the battery pack is described in section "4.2.1 Battery Pack ". 1. Do not disassemble the computer unless it is operating abnormally. 2. Use the designated tools. 3. Ensure that the environment for working on and storing parts does not contain any of the following. q Dust or dirt q Static electricity q Extremely hot, cold, or humid conditions 4. Perform the diagnostic tests described in Chapter 2 to determine which FRU is the cause of the fault. 5. Do not perform any unnecessary work. Always work in accordance with the disassembly and reassembly procedures in this manual. 6. Keep parts removed from the computer in a safe place away from the computer where they will not be damaged or interfere with your work. 7. Disassembling requires the removal of a large number of screws. Keep removed screws in a safe place such that you can determine which screws belong to which part. 8. When reassembling, ensure that you use the correct screws and fit parts in the correct position. Screw sizes are no ted in the text and figures. 9. As all parts have sharp edges and corners, take care not to cut yourself. 10. After replacing an FRU, check that the computer and replaced part operate correctly. Satellite A50/TECRA A2 Maintenance Manual (960-478) 4-3

Section	Page
Table of Contents	6
Chapter 1 Hardware Overview	11
1.1 Features	15
1.2 System Block Diagram	20
1.3 3.5-inch USB Floppy Disk Drive	24
1.4 2.5-inch Hard Disk Drive	25
1.5 CD-ROM Drive	30
1.6 DVD-ROM Drive	31
1.7 DVD-ROM & CD-R/RW Drive	32
1.8 DVD-R/-RW drive	34
1.9 DVD Super Multi drive	35
1.10 Keyboard	37
1.11 TFT Color Display	38
1.12 Power Supply	42
1.13 Batteries	44
1.14 AC Adapter	48
Chapter 2 Troubleshooting Procedures	49
2.1 Troubleshooting	55
2.2 Troubleshooting Flowchart	56
2.3 Power Supply Troubleshooting	60
2.4 System Board Troubleshooting	71
2.5 3.5” FDD Troubleshooting	85
2.6 2.5” HDD Troubleshooting	88
2.7 Keyboard Troubleshooting	93
2.8 Display Troubleshooting	94
2.9 Touch Pad Troubleshooting	96
2.10 Optical Drive Troubleshooting	97
2.11 Modem Troubleshooting	98
2.12 LAN Troubleshooting	99
2.13 Sound Troubleshooting	100
2.14 Wireless LAN Troubleshooting	102
Chapter 3 Tests and Diagnostics	105
3.1 The Diagnostic Test	109
3.2 Executing the Diagnostic Test	111
3.3 Setting of the hardware configuration	115
3.4 Subtest Names	117
3.5 System Test	119
3.6 Memory Test	123
3.7 Keyboard Test	125
3.8 Display Test	128
3.9 Floppy Disk Test	131
3.10 Printer Test	133
3.11 Async Test	135
3.12 Hard Disk Test	137
3.13 Real Timer Test	140
3.14 NDP Test	142
3.15 Expansion Test	143
3.16 CD-ROM/DVD-ROM Test	145
3.17 Sound/LAN/Modem /TV Test	146
3.18 IEEE1394 Test	151
3.19 Wireless LAN Test (Atheros)	152
3.20 Wireless LAN Test (Calexico)	156
3.21 Thermal Radiation Control Test	160
3.22 Error Code and Error Status Names	161
3.23 Hard Disk Test Detail Status	165
3.24 FDD Cleaning	167
3.25 Log Utilities	168
3.26 Running Test	170
3.27 Floppy Disk Drive Utilities	172
3.28 System Configuration	177
3.29 SETUP	179
Chapter 4 Replacement Procedures	197
4.1 Overview	205
4.2 Battery Pack/PC Card	212
4.3 Memory Module	215
4.4 MDC Modem	217
4.5 HDD	219
4.6 Mini PCI Card	222
4.7 Cooling Fin/CPU	224
4.8 Keyboard	229
4.9 Switch Board	233
4.10 Optical Drive	235
4.11 Display Assembly	237
4.12 Sound Board	241
4.13 Connector Board	243
4.14 Fan	245
4.15 System Board/DC-IN Jack/RTC Battery	246
4.16 Battery Latch	249
4.17 Battery Lock	251
4.18 Touch Pad	253
4.19 LCD Unit/FL Inverter	255
4.20 Latch Assembly	261
4.21 Wireless LAN Antenna/Speaker/Hinge	262
Appendices	271
Appendix A Handling the LCD Module	279
Appendix B Board Layout	285
Appendix C Pin Assignment	291
Appendix D Keyboard Scan/Character Codes	323
Appendix E Key Layout	331
Appendix F Wiring Diagrams	333
Appendix G BIOS/KBC/EC Update	335

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4.1

Overview

Replacement Procedures

Satellite A50/TECRA A2

Maintenance Manual (960-478)

4-3

Before You Begin

Take note of the following points before starting work. Always remove the AC adapter and

battery pack before commencing any of the procedures. The procedure for removing the

battery pack is described in section “4.2.1 Battery Pack”.

Do not disassemble the computer unless it is operating abnormally.

Use the designated tools.

Ensure that the environment for working on and storing parts does not contain any of

the following.

Dust or dirt

Static electricity

Extremely hot, cold, or humid conditions

Perform the diagnostic tests described in Chapter 2 to determine which FRU is the

cause of the fault.

Do not perform any unnecessary work. Always work in accordance with the

disassembly and reassembly procedures in this manual.

Keep parts removed from the computer in a safe place away from the computer where

they will not be damaged or interfere with your work.

Disassembling requires the removal of a large number of screws. Keep removed

screws in a safe place such that you can determine which screws belong to which part.

When reassembling, ensure that you use the correct screws and fit parts in the correct

position. Screw sizes are no ted in the text and figures.

As all parts have sharp edges and corners, take care not to cut yourself.

10.

After replacing an FRU, check that the computer and replaced part operate correctly.