Technical information

Emergency Power-Off Switches

2-18 Tenth Edition 9871

Cartridge Subsystem EPO Switch

Note: The 9840/T9940 drive does not have an EPO switch.

4xxx EPO Switch

Note: Use the EPO switch only in an emergency.

See Figure 2-7 for the location of the

EPO switch on the control unit.

Pressing this switch immediately removes all power from the AC and DC power

supplies, and from the attached cartridge drives.

Note: This switch starts an uncontrolled power off and might cause a loss of

data.

See the instructions at “4480/4490 Cartridge Subsystem” on page 3-7.

Figure 2-7. Cartridge Subsystem EPO Switch

4480

0357

EPO

SWITCH