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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.
To use the printer port LED follow these steps:
1.
Turn the computer on, then set to boot mode.
2.
Turn the computer off.
3.
Plug the printer port LED into the computer's parallel port.
4.
Hold the space bar down and turn the computer on.
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, when the printer
port LED displays 1F and halts, the IRT test has already completed the Display
initialization. In this instance, the IRT indicates an error has been detected
during the system memory test.
100CS
Figure 2-2 Printer port LED
2-9
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