On Board LED Diagnostic 컴컴컴컴컴컴컴컴컴컴컴� When power is first applied to the card, an on-board diagnostic routine is run to verify that the major functional components of the board are operating correctly. The 80C20 bus master chip, the SCSI controller chip, the firmware PROM, the local RAM and internal data buses are tested. Results of the tests are indicated by an LED on the board. The LED will first turn on when power is applied. If the diagnostics find no malfunctions, the LED will then go off. In normal operation, the LED will be illuminated when command or SCSI bus activity occurs on the board. If an error is detected by the diagnostics, the LED will repeatedly flash a specific number of times, with a long pause between flashes, to indicate the board function which failed. This will continue until the board is powered down or reset. Failure interpretation from the number of flashes is as follows: Number of LED Flashes Interpretation of the failure 컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� Always on Card is not operating or terminator are missing 1 Firmware ROM checksum failure 2 Local RAM test failure 3 SCSI controller chip or SCSI interface failure 4 Internal data bus failure 5 Internal address bus failure 6 Bus master chip failure 7 SCSI drive type mismatch Single Ended drive connected on differential SCSI bus Constantly Flashing Fuse Blown