T3400/T3400CT Maintenance Manual
Procedure 3 Printer Port LED Check on Resume Mode
The printer port LED displays IRT and test status by turning lights on and off as an eight-digit
binary value for resume mode.
NOTE: When performing this check, the Ext. FDD/PRT option in the SETUP pro-
gram must be set to PRT and the computer to resume mode.
To use the printer port LED, follow these steps:
1. Turn on the T3400/T3400CT power, then set to resume mode.
2. Turn off the power.
3. Plug the printer port LED into the PRT/FDD connector.
4. 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 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, go to
Procedure 5.
Table 2-2 Printer Port LED Resume Mode Error Status
Error status Meaning of status
00H RAM BIOS error
F0H Press the reset switch.
F1H Suspend process error (The system will suspend while FDD is accessed, etc.)
F2H The system has optional ROM, or optional card (CGA, MDA).
F4H Backup RAM checksum error
F5H Main memory checksum error
F6H Video RAM checksum error
F7H Extended memory checksum error
F8H Backup RAM checksum error
F9H Main memory checksum error
FAH Video RAM checksum error
FBH Extended memory checksum error
FDH Card modem error (The card modem will be removed while the system is in
resume, etc.)
FEH Password error (The password will be erased before it is suspended.)
UPDATE
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