Adaptec 1742A User Manual
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Contents
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Chapter SevenTroubleshootingThe AHA-1740A/1742A/1744 executes a self-test diagnosticswhen the system power is turned on or after a Hard Reset. Theself-test diagnostics tests the CPU operation, performs a check-sum test on the EPROM and checks the data transfer paths onthe host adapter. The host system diagnostics may perform amore extensivediagnostics by reading and writing data to memory.Determining Problems Using the LEDThe red Light-Emitting Diode (LED) on the host adapter indi-cates the result of the self-test diagnostic. When the power isfirst applied to the host adapter, the LED is turned on. Undernormal operation the LED turns off when the self-test diagnosticsis complete. The LED remains off until the host initiates activityon the SCSI bus or I/O port. If the self-test diagnostics fails theLED will flash a code indicating the type of test failure. The LEDwill flash once, twice (in rapid succession) or three times (in rapidsuccession) followed by a longer pause to indicate the type of testfailure. The flash code is repeated continuously until the hostadapter is powered-off, reset, or repaired.If you are running the self-test diagnostic for fault-isolation pur-poses disconnect the SCSI interface cable. However, ensure thatat least one set of SCSI terminators are installed on the last SCSIdevice. If the SCSI terminators are not present the LED remainson; indicating that the AHA-1740A/1742A/1744 is receiving anactive RST signal. Continuous execution of the self-test diagnos-tics on the AHA-1740A/1742A can be enabled by inserting thediagnostic jumper pair on pin 4 of jumper 6. For the AHA-1744 in-sert the jumper pair on pin 4 of jumper 5.7-1 |
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