Toshiba TECRA S4 Maintenance Manual page 61

2.4 System Board Troubleshooting
To use the printer port LED, follow the steps below:
1. Turn on the computer's power and set it to boot mode.
2. Turn off the computer's power.
3. Plug the printer port LED into the parallel port.
4. While holding down the space bar, turn on the computer's power.
5. Read the LED status from left to right.
6. Convert the status from binary to hexadecimal notation.
7. If the final LED status is FFh (normal status), go to Procedure 4.
TECRA S3 Maintenance Manual (960-532)
2 Troubleshooting Procedures
[CONFIDENTIAL] 2-19