Toshiba T1960CT Maintenance Manual page 28

Procedure 2 Printer Port LED Check on Boot Mode
The printer port LED displays the IRT 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.
NOTE: When you perform this check, the external FDD/PRT option in the SETUP
program must be set to PRT and set to boot mode.
To use the printer port LED follow these steps:
1. Turn on the T1960CS/T1960CT's power, then set it to boot mode.
2. Turn off the computer.
3. Plug the printer port LED into the computer's PRT/FDD connector.
4. Hold down the space bar and turn on the power to the computer.
5. Read the LED status from left to right as you are facing the back of the computer.
6. Convert the status from binary to hexadecimal notation.
7. If the final LED status is FFh (normal status), go to Procedure 3.
8. If the final LED status matches any of the test status values in Table 2-1, 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, if the printer port LED displays 22
and halts, the IRT test has already completed the KBC test. In this instance, the IRT
indicates an error has been detected during the system memory test.
T1960CS/T1960CT
Figure 2-2 Printer Port LED
2-11