T3400/T3400CT Maintenance Manual
2.4 System Board Troubleshooting
This section describes how to determine if a system board is defective. Start with Procedure 1
and continue as instructed. The procedures provided are:
Procedure 1: Message Check
Procedure 2: Printer Port LED Check on Boot Mode
Procedure 3: Printer Port LED Check on Resume Mode
Procedure 4: Diagnostic Test Program Execution Check
Procedure 5: Replacement Check
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