Toshiba 430CDT - Page 135

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4-24

430 Series

5. Remove two tapes and disconnect the microphone cable from PJ3 on the sound

board.

Figure 4-23 Disconnecting the microphone cable

6. Disconnect the VGA board from system board connector PJ16.

Figure 4-24 Disconnecting the VGA board

Main Page

System Unit Block Diagram5
Inch Floppy Disk Drive9
Inch Hard Disk Drive10
CD-ROM Drive12
Power Supply17
Main Battery18
Battery Charging Control18
Backup Battery19
RTC Battery20
Troubleshooting21
Troubleshooting Flowchart22
Power Supply Troubleshooting25
System Board and Sound Board Troubleshooting27
Message Check27
Procedure 2 Printer Port LED Check on Boot Mode30
Procedure 4 Diagnostic Test Program Execution Check33
Procedure 5 Replacement Check33
Floppy Disk Drive Troubleshooting34
Diagnostic Test Program Execution Check35
Procedure 3 Connector Check and Replacement Check36
Hard Disk Drive Troubleshooting37
Procedure 2 Message Check38
Procedure 3 Format Check39
Keyboard Troubleshooting41
Display and VGA Board Troubleshooting42
Connector Check43
CD-ROM Drive Troubleshooting45
Procedure 2 Diagnostic Test Program Execution Check45
The Diagnostic Test46
Executing the Diagnostic Test48
Subtest Names51
System Test53
Memory Test54
Keyboard Test56
Display Test59
Floppy Disk Test63
Printer Test65
Async Test67
Hard Disk Test69
Real Timer Test72
Ndp Test74
Expansion Test75
Sound Test76
Error Code and Error Status Names79
Hard Disk Test Detail Status82
Hard Disk Format84
Head Cleaning89
Function Description89
Log Utilities90
Running Test92
Floppy Disk Drive Utilities94
System Configuration97
Accessing the SETUP Program99
Setup Options100
Full Power106
Low Power106
Safety Precautions113
Before You Begin114
Disassembly Procedures115
Tools and Equipment116
Screw Tightening Torque116
Removing the Battery Pack117
Installing the Battery Pack118
Removing an Optional PC Card119
Installing an Optional PC Card120
Optional Memory Module121
Floppy Disk Drive (FDD)123
Removing the FDD123
Removing the CD-ROM Drive126
Installing the CD-ROM Drive128
Hard Disk Drive (HDD)129
Removing the HDD129
Removing the Keyboard131
Installing the Keyboard133
Sub-Battery and VGA Board134
RTC Battery and Top Cover with Display Assembly138
Sound Board and Membrane Switch141
Removing the Speaker144
Installing the Speaker145
Removing the Infrared Board148
System Board and Fan150
Removing the Display Mask152
Installing the Display Mask153
Fluorescent Lamp (FL) Inverter Board (DSTN)156
Liquid Crystal Display (LCD) Module (TFT)158
Liquid Crystal Display (LCD) Module (DSTN)160
Removing the Microphone167
Installing the Microphone167
Appendix A Handling the Lcd Module168
Precautions for Handling the LCD Module168
Appendix B Board Layout172
Keyboard Scan/Character Codes177
Key Layouts183
Appendix F Wiring Diagrams187
Printer Wraparound Connector187
RS-232-C Wraparound Connector187
RS-232-C Direct Cable (9-Pin to 9-Pin)187
RS-232-C Direct Cable (9-Pin to 25-Pin)188
Appendix G BIOS Rewrite Procedures189

Toshiba 430CDT - Page 135

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