T3400/T3400CT Maintenance Manual
Procedure 2 Printer Port LED Check on Boot Mode
The printer port LED displays IRT 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 performing this check, the Ext. FDD/PRT option in the SETUP pro-
gram must be set to PRT and the computer to boot mode.
Figure 2-2 Printer Port LED
To use the printer port LED, follow these steps:
1. Turn on the T3400/T3400CT power, then set to boot mode.
2. Turn off the power.
3. Plug the printer port LED into the PRT/FDD connector.
4. Hold down the space bar and turn on the power.
5. Read the LED status from left to right at the back of the computer.
6. Convert the status from binary to hexadecimal notation.
7. If final LED status is FFh (normal status), go to Procedure 3.
8. If 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, the printer port LED displays an
error code after the IRT ends. For example, when the printer port LED displays 22
and halts, the IRT has already completed the KBC test. In this instance, the IRT
indicated an error was detected during system memory test.
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