2.4 System Board Troubleshooting
2 Troubleshooting Procedures
TECRA M5 Maintenance Manual (960-542)
[CONFIDENTIAL]
2-21
Table 2-5 Printer port LED boot mode status (1/9)
LED Status
Test item
Contents
Permission of A20 and clear of software
reset bit
Prohibition
of
APIC
Initialization of MCH, ICH
Initialization of Super I/O
Initialization of debug port (For models
supporting debug port)
Dummy read of 3
rd
Bus data
Setting of printer port (For models
supporting printer port)
B0h
PIT CH0 initialization (for HOLD_ON)
BIOS rewrite factor flag initialization
CHECK SUM CHECK
Transition to protected mode
Boot block checksum (skipped when
returned from S3)
Halts when error occurs
Checksum other than boot block (skipped
when returned from S3)
B1h
EC/KBC rewrite check
If “rewrite” is requested, go to “BIOS rewrite
process”.
B2h
Initialization of SC
HLT at LED=B3H or B4, when error occurs
Key input (skipped when returned from
S3)
When a key is pressed, check if it is Tilde
key or Tab key. (skipped when returned from
S3)
B5h Enables
CPU
cache
B6h Security
check
BIOS rewrite request check
If Checksum check error occurred on except
Boot Block or rewrite is required by user, go
to “BIOS rewrite process”.
B7h
Transits to System BIOS IRT
BIOS
rewrite
process
Initialization of ICH. D31
DRAM
configuration
Permission of cache (L1 cache only)
Memory
clear
Transition to real mode and copy of BIOS
to RAM
Summary of Contents for TECRA M5
Page 10: ...x CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...
Page 11: ... CONFIDENTIAL Chapter 1 Hardware Overview ...
Page 12: ...1 Hardware Overview 1 ii CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...
Page 48: ...1 Hardware Overview 1 13 AC Adapter 1 34 CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...
Page 49: ... CONFIDENTIAL Chapter 2 Troubleshooting Procedures ...
Page 50: ...2 Troubleshooting Procedures 2 ii CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...
Page 125: ... CONFIDENTIAL Chapter 3 Tests and Diagnostics ...
Page 126: ...3 Tests and Diagnostics 3 ii CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 3 ...
Page 130: ...3 Tests and Diagnostics 3 vi CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...
Page 231: ...Chapter 4 Replacement Procedures CONFIDENTIAL ...
Page 232: ...4 Replacement Procedures 4 ii CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...
Page 329: ... CONFIDENTIAL Appendices ...
Page 330: ...Appendices App ii CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...
Page 350: ...Appendices Appendix B Board Layout B 8 CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...
Page 380: ...Appendices Appendix C Pin Assignments C 30 CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...
Page 390: ...Appendices Appendix E Key Layout E 2 CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...
Page 392: ...Appendices Appendix F Wiring diagrams F 2 CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...
Page 398: ...Appendices Appendix I Reliability I 2 CONFIDENTIAL TECRA M5 Maintenance Manual 960 542 ...