AT&T DEFINITY 555-230-223 - Manual (Page 130)

Maintenance
!
CAUTION:
Check that backup tapes are not write-protected; the tab is positioned
closest to the end of the cartridge (it will cover the deeper inset). On the
generic tape, ensure that the tab remains in the write-protected position.
Replacing the Disk/Tape Drive
To remove either the disk drive or the tape drive from the Alarm Board, refer
back to Figure 4-1 and follow the steps below.
!
WARNING:
Static electricity can be destructive to system parts. Use an anti-static wrist
strap whenever removing or installing a DEFINITY AUDIX system. Also use
an anti-static mat when taking the system apart to replace circuit packs or
storage devices.
1. Ensure that the users know you will be powering down the system and
disrupting service.
2. If it is not already shut down, bring the system to the MSHUT state.
(From the Main Menu, select Maintenance, Reset System, and then
Shutdown.)
3. Carefully slide the system from the switch carrier. Handle with care; the
system weighs 6.2 pounds.
4. Cut loose and remove the tie wrap that holds the power cable and the
tape drive SCSI bus cable against the Alarm Board.
5. Disconnect the SCSI bus cable from the Alarm Board that is connected to
the drive being replaced, using the pull tabs. (This sentence is unclear;
please clarify.)
6. As shown in Figure 4-6, unlock each of two retaining pins (B) from the
slots along the edge of the Alarm Board that hold the drive in place. Slide
out both pins (C); this releases the drive from the board.
A B C
Figure 4-6. Unlock Retaining Pin
7. Disconnect the power and SCI bus cables from the drive.
8. On the tape drive, pry off the stainless steel EMI shield. Note that the
narrow end of the cover fits over the ridge above the option jumpers; the
wide end locks over the mounting bracket.
Issue 1 January 1996 4-15