Printer Port Led Boot Mode Status - Toshiba Portege M100 Maintenance Manual

2.4 System Board Troubleshooting
To use the printer port LED, follow the steps below:
1. Plug the printer port LED into the parallel port of the Advanced Port Replicator.
2. Turn on the computer.
3. Read the LED status from left to right as you are facing the back of the computer.
4. Convert the status from binary to hexadecimal notation.
5. If the final LED status is FFh (normal status), go to Procedure 3.
6. If the final LED status matches any of the test status values in Table 2-3, perform
Check 1.
NOTE: If an error condition is detected by the IRT test, the printer port LED displays an
error code after the IRT test ends. For example, when the printer port LED
displays 13h and halts, It indicates that the system memory test has already
completed and an error has been detected during the expansion memory test.
LED Status
FFh Start
B0h Flash ROM check
B1h EC/KBC rewrite check
B2h BIOS rewrite
System BIOS rewrite transition to
IRT
BIOS rewrite process
B5h
PORTEGE M100 Maintenance Manual (960-452)
Table 2-4 Printer port LED boot mode status (1/5)
Test item
2 Troubleshooting Procedures
Message
Register initialization for boot block
PIT ch.0 initialization
BIOS rewrite flag initialization
Transition to protected mode
Boot block checksum
Checksum check except boot block
KBC initialization
BIOS rewrite request check
System BIOS rewrite transition to IRT
BIOS rewrite register initialization
PIT channel 1 initialization
PIT, DMAC,PIC initialization
Memory type check
Cache bus, L2 initialization, configuration
Enabling L1 cache
Memory clear
Protecting flash ROM area cache
2-21