Toshiba Satellite M20 Maintenance Manual page 51

2.4 System Board
Follow the steps below to use the printer port LED:
1. Turn on the computer and set the boot mode.
2. Turn off the computer.
3. Plug the printer port LED into the computer's parallel port (printer port).
4. Read the LED status from left to right as you are facing the back of the computer.
5. Convert the LED status from binary to hexadecimal notation.
6. If the final LED status is FFh (normal status), go to Procedure 5.
7. If the final LED status matches any other status in Table 2-1, go to Procedure 6.
NOTE: The printer port LED displays each status upon completion of the corresponding
POST test item. If the POST terminates with 21h displayed on the printer port LED, for
example, the POST has completed KBC initialization and detected an error
Satellite M20 Maintenance Manual
2 Troubleshooting
2-13