IBM T400F manual Diagnostic and maintenance functions continued, Running a SCSI Wrap Test

Table 9. Diagnostic and maintenance functions (continued)

Function Code 6 - Run SCSI or Fibre Channel Wrap Test

Causes the drive to perform one of the following:

vA check of the SCSI circuitry from and to the SCSI connector

vA check of the Fibre Channel circuitry from and to the Fibre Channel connector or fiber cable

To run the test, determine whether your drive uses a SCSI or Fibre Channel interface, then choose one of the following procedures.

Running a SCSI Wrap Test

This test evaluates the SCSI circuitry. A SCSI LVD wrap plug, a SCSI LVD terminator, and a Y-cable are required for this procedure.

Note: You can terminate the Generation 1 drive internally while running the SCSI wrap test. Internal termination is not built into the Generation 2 drive, therefore you must run the SCSI wrap test by using a Y-cable and external termination.

Before you select this function, you must configure the drive to supply term power, terminate the SCSI bus, and attach the SCSI wrap plug. Configure the drive to supply term power by placing a jumper on pin 6 of the drive’s SCSI ID connector (as shown by the shaded area in the figure below).

A67E0049

Connect a Y-cable to the drive’s SCSI connector. Place a terminator on one end of the Y-cable and the wrap plug on the other end.

1.Ensure that the drive does not contain a cartridge.

2.Within a 1.5-second interval, press the unload button three times. The status light becomes solid amber, which means that the drive is in maintenance mode.

3.Press the unload button once per 1.5 seconds until 6 appears in the single-character display. If you cycle past 6, continue to press the unload button until it redisplays.

4.To select the function, press and hold the unload button for 3 seconds. After you select the function, the tape drive automatically starts the test:

v If the test is successful, it loops and begins again. To halt the test, press the unload button. The drive acknowledges the request by slowing the length of time that the currently displayed character flashes on the single-character display (from twice per second to once per second). The test continues to the end of its loop, then stops. 0 displays and the drive exits maintenance mode. To continue to isolate the problem, go to “Fixing SCSI Bus Errors” on page 77 and locate the steps to take after you run the SCSI wrap test.

vIf the test fails, 8 displays, the test stops, and the tape drive exits maintenance mode. To resolve the error, replace the tape drive (see “Removing a SCSI Tape Drive from an Enclosure” on page 83).

Chapter 4. Operating 39