2-12 420 Series
Procedure 3 Printer Port LED Check on Resume 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 resume mode.
To use the printer port LED follow these steps:
1. Turn on the power, then set to resume mode.
2. Turn off the power.
3. Plug the printer port LED into the parallel port.
4. Turn on the power.
5. Read the LED status from left to right as you face 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 4.
8. If the final LED status matches any of the test status values in Table 2-2, perform
Procedure 5.
Table 2-2 Printer port LED resume mode error status
Error status Meaning of status
F1H RAM BIOS error
F2H The system has optional ROM, or optional card (CGA, MDA)
F5H Main memory checksum error
F6H Video RAM checksum error
F7H Extended memory checksum error
Procedure 4 Diagnostic Test Program Execution Check
Execute the following tests from the Diagnostic Test Menu. Refer to Chapter 3, Tests and
Diagnostics, for more information on how to perform these tests.
1. System test
2. Memory test
3. Printer test
4. ASYNC test
5. Real Timer test
6. NDP test
7. Expansion test
8. Sound test
9. CD-ROM test
If an error is detected during any of these tests, go to Procedure 5.
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