Technical data

Table 2–1 (Cont.): TSZ07 Controls and Indicators
Item Function
ON/OFF
Switch
When pressed once, connects dc power throughout the drive and lights the
On/Off indicator. When pressed again, disconnects dc power and turns off the
indicator.
CAUTION
Once the drive is installed and running on a host
system, operating this switch may interrupt the
normal operation of that system.
When set to on, the drive initializes causing the following to occur:
1. Load Rewind, Unload, Online, Wrt En Test, and Density Select indicators
flash and TESTING appears in the display.
2. TESTING changes to TESTPASS and the indicators continue to flash.
3. Indicators extinguish.
4. Display goes blank, then the Unload and On/Off indicators light showing
that the drive is ready for loading tape and normal operation.
DENSITY
SELECT
Switch
This switch functions only when the drive is off line and tape is loaded at BOT,
or when no tape is loaded.
When pressed, selects the operating density that tapes are to be written in.
This causes the drive to select the next available density as the operating
density and display the selection on the alphanumeric display. For example,
if the drive powers-up with a default density of 1600, and the Density Select
switch is pressed, the drive switches to the 6250 density and the message CMD
6250 appears at the alphanumeric display.
Using this switch to select an operating density (commanded density) different
from the one selected by the drive as a result of reading an identification burst
(found density) does not necessarily cause the drive to begin immediately using
the newly commanded density. The identification burst on the tape always
determines the operating density — unless the condition is met as explained
under "Automatic Density Selection" in the TSZ07 Tape Drive Installation
/Owner’s Manual.
WRT EN TEST
Switch
This switch functions only when the drive is off line. When pressed, provides
access to the TSZ07 service aids explained in Chapter 4. (It does not write
enable the drive.)
ONLINE
Switch
When pressed, places the drive on line and causes the Online indicator to light.
If the drive is already on line, pressing this switch cause the drive to go off line
and the Online indicator to extinguish.
Operation 2–3