Toshiba M1 manual Procedure 2 Printer Port LED Check on Boot Mode, Printer port LED

2.4 System Board Troubleshooting 2 Troubleshooting Procedures

Procedure 2 Printer Port LED Check on Boot Mode

The printer port LED displays the IRT (Initial Reliability Test) status and test status by turning lights on and off as an eight-digit binary value for boot mode. Figure 2-2 shows the printer port LED.

Figure 2-2 Printer port LED

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 2001.

2.Read the LED status from left to right as you are facing the back of the computer.

3.Convert the status from binary to hexadecimal notation.

4.If the final LED status is FFh (normal status), go to Procedure 4.

5.If the final LED status matches any of the test status values in Table 2-3, perform Check 1.

NOTE: If an error 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 B2 and halts, the IRT test has already completed the KBC initialization. In this instance, the IRT indicates an error has been detected during the BIOS rewrite.

TECRA M1 Maintenance Manual (960 -436) 2-19