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2 Troubleshooting Procedures
2.5 FDD TroubleshootingSystem Board Troubleshooting
2-20
TECRA M1 Maintenance Manual (960 -436)
Table 2-3 Printer port LED boot mode status (1/8)
LED Status
Test item
Message
Register initialization for boot block
Clearance of software reset bit
Permission of A20 line
FFh
Start
Initialization for special register and Intel chip set
PIT CH0 initialization (for HOLD_ON)
BIOS rewrite flag initialization
Checksum check
Transition to protected mode
Boot block checksum (HLT when check error occurred.)
B0H
Flash ROM check
Checksum check except boot block
Transition to BIOS rewriting when required
Enabling KB
B1H
EC/KBC rewrite check
[tilde] [TAB] key check
B2H
BIOS rewrite request check
Transition to BIOS rewriting when checksum error other
than Boot Block is detected, or user requested rewriting.
System BIOS rewrite transition to
IRT
Rewriting BIOS
Setting of base for Power Management I/O Space
Enabling BIOS writing
Serial interrupt control
Disabling BIOS rewrite protection
Enabling SM Bus I/O space
Enabling SM Bus access
Opening work I/O for SDRAM initialization
H/W initialization
Setting FDC prohibition
Initialization of HW for each model
Initialization of PIT channel 1
(Setting refresh interval to 30ms)
Initialization of PIT, DMAC, PIC
DRAM configuration
Enabling L1 cache
Memory clear
B3H
Transition to real mode, copy BIOS
to RAM
Summary of Contents for Tecra M1
Page 1: ...Toshiba Personal Computer TECRA M1 Maintenance Manual TOSHIBA CORPORATION File Number 960 436 ...
Page 6: ...vi TECRA M1 Maintenance Manual 960 436 ...
Page 10: ...x TECRA M1 Maintenance Manual 960 436 3 29 SETUP 3 78 ...
Page 13: ...TECRA M1 Maintenance Manual 960 436 xiii ...
Page 14: ...Chapter 1 Hardware Overview ...
Page 15: ...1 Hardware Overview 1 ii TECRA M1 Maintenance Manual 960 436 ...
Page 32: ...1 2 System Unit Block Diagram 1 Hardware Overview TECRA M1 Maintenance Manual 960 436 1 15 ...
Page 54: ...Chapter 2 Troubleshooting Procedures ...
Page 55: ...2 Troubleshooting Procedures 2 ii TECRA M1 Maintenance Manual 960 436 ...
Page 58: ...2 Troubleshooting Procedures TECRA M1 Maintenance Manual 960 436 2 v ...
Page 60: ...2 Troubleshooting Procedures TECRA M1 Maintenance Manual 960 436 2 vii ...
Page 123: ...Chapter 3 Tests and Diagnostics ...
Page 124: ...3 Tests and Diagnostics 3 ii TECRA M1 Maintenance Manual 960 436 ...
Page 224: ...3 Tests and Diagnostics 3 29 SETUP 3 96 TECRA M1 Maintenance Manual 960 436 ...
Page 225: ...Chapter 4 Replacement Procedures ...
Page 226: ...4 Replacement Procedures 4 ii TECRA M1 Maintenance Manual 960 436 ...
Page 309: ......
Page 327: ...4 Replacement Procedure 4 25 Fluorescent Lamp 4 90 TECRA M1 Maintenance Manual 960 436 ...
Page 330: ...4 25 Fluorescent Lamp 4 Replacement Procedure TECRA M1 Maintenance Manual 960 436 4 93 ...
Page 349: ...Appendices ...
Page 350: ...Appendices App ii ...
Page 362: ...Appendices Appendix A Handling the LCD Module A 6 TECRA M1 Maintenance Manual 960 436 ...
Page 368: ...Appendices Appendix B Board Layout B 6 TECRA M1 Maintenance Manual 960 436 F VR3000 Volume ...
Page 395: ...Appendices Apx C Pin Assignments C 24 TECRA M1 Maintenance Manual 960 436 123 NC 124 B3V ...
Page 401: ...Appendices Apx C Pin Assignments C 30 TECRA M1 Maintenance Manual 960 436 41 FL P5V ...
Page 408: ...Appendix C Pin Assignments Appendices TECRA M1 Maintenance Manual 960 436 C 37 ...
Page 418: ...Appendices Appendix E Key Layout E 2 TECRA M1 Maintenance Manual 960 436 ...
Page 422: ...Appendices Appendix G BIOS Rewrite Procedures G 2 TECRA M1 Maintenance Manual 960 436 ...
Page 424: ...Appendices Appendix H EC KBC Rewrite Procedures H 2 TECRA M1 Maintenance Manual 960 436 ...
Page 426: ...Appendices Appendix I Reliability I 2 TECRA M1 Maintenance Manual 960 436 ...