IBM T400F manual Unload Button, Single-Character Display, Single Red Dot, Operating

Unload Button

The unload button (	in Figure 9 on page 31) enables you to perform the following
functions:

vRewind the tape into the cartridge and eject the cartridge from the tape drive. For more information, see “Removing a Tape Cartridge” on page 35.

vEnter or exit maintenance mode, or perform diagnostic or maintenance functions. For more information, see “Selecting a Diagnostic or Maintenance Function” on page 36.

vPerform a panic reset of the drive. Attention: If the tape drive detected a permanent error and displayed an error code, it automatically forces a drive dump (also known as a save of the firmware trace). If you perform a panic reset of the drive, the existing dump will be overwritten and lost. To perform a panic reset, press and hold the unload button on the drive for 10 seconds. The drive forces a dump and overwrites the existing dump. The drive then reboots to allow communication.

Single-Character Display

The Ultrium 2 Tape Drive features an LED (		in Figure 9 on page 31) that
presents a single-character code for:
v	Diagnostic or maintenance functions
v	Error conditions and informational messages

Table 9 on page 36 lists each single-character code that is used for diagnostic or maintenance functions. Table 15 on page 67 lists the codes for error conditions and informational messages. If multiple errors occur, the code with the highest priority (represented by the lowest number) displays first. When the error is corrected, the code with the next highest priority displays, and so on until no errors remain.

Single Red Dot

The single-character display is blank during normal operation. However, if a drive dump is present while the drive is in maintenance mode, a single red dot illuminates on the display. To copy the dump to tape, see Function Code 5 in Table 9 on

page 36.

The red dot turns off when you obtain the dump (by using an FMR tape a SCSI command, or a library command). If no dump is present while the drive is in maintenance mode, the single red dot does not illuminate.

Chapter 4. Operating 33