Chapter 3. Operating the drive
Operating the drive involves using the following front panel items:
v Single-character display (SCD)
v SCD dot
v Status LED
v Unload button
Single-character display (SCD)
The SCD (2 in Figure 2 on page 2) presents a single-character code for:
v Error conditions and informational messages
v Diagnostic or maintenance functions (while in Maintenance Mode only)
“Error codes and messages” on page 46 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.
“Diagnostic and maintenance functions” on page 16 lists the single-character codes
that represent diagnostic or maintenance functions. To initiate a function, the unit
must be in Maintenance Mode.
The SCD is blank during normal operation.
SCD dot
If a drive dump is present while the drive is in Maintenance Mode, a single red
dot illuminates in the lower right corner of the SCD (
8
). To copy the dump, see
“Function Code 5: Copy drive dump” on page 24.
The SCD Dot is on solid if the dump is in ROM memory. The SCD Dot flashes if
the dump is in FLASH memory.
The SCD Dot turns off when you obtain a dump (by using ITDT, a library
command, a SCSI command, or "Function Code 5: Copy Drive Dump) or update
the drive firmware.
Note: If the drive dump is stored in ROM memory (SCD Dot on solid), the dump
will be lost when you turn OFF the power or reset the drive.
Status LED
The status light-emitting diode (LED) (4 in Figure 2 on page 2) that provides
information about the state of the drive. The LED can be green or amber, and
(when lit) solid or flashing. Table 3 on page 12 lists the conditions of the status
light and single-character display (SCD) and provides an explanation of what each
condition means. The SCD dot – a small LED dot near the lower right corner of
the single-character display – serves as a dump indicator. When this dot is lit, a
dump file is stored in the drive and can be retrieved.
© Copyright IBM Corp. 2011 11
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