User`s guide

Troubleshooting Printer Diagnostic - 2
Printer Diagnostic
To enable the printer diagnostic, switch off the printer, jumper
pins 7 and 9 on the I/O board DB-9 connector, and switch on the
printer. Under normal conditions, LEDs should flash during
startup for about 15 seconds and then fix on the "diagnostic
executing" configuration for about 2 minutes.
9
7
Jumper
Diagnostic Executing
No Error Found