AT&T DEFINITY 555-230-223 - Manual (Page 129)

Maintenance
3. Unsnap the two gang latches at the bottom front of the MFB and Alarm
Board, and swing downward. Squeeze the boards together and slip off
the spring clip.
4. Carefully slide the DEFINITY LAN Gateway system from the switch
carrier. Handle with care; the system weighs 6.2 pounds.
5. Disconnect the Interboard bus cable from the top edge of both boards
using the pull tab.
6. Remove the three socket-headed slotted screws that hold the MFB to the
alarm board.
7. Separate the two boards. If the alarm Board is to be replaced, remove the
disk and tape drives from it as described in "Replacing the Disk/Tape
Drive" in this chapter.
Replace the MFB or Alarm Board using the above steps in reverse order. Note
the play between the boards when they are together. This allows the system to
be easily seated into the switch carrier.
Cleaning the Tape Head
The tape drive requires manual cleaning of its tape heads every three months or
after every 100 passes. Use the provided kit that includes a cleaning tape
cartridge, cleaning sticks, and cleaning solution, and follow these steps.
1. NEED PROCEDURE
2.
!
CAUTION:
— The cleaning solution is highly volatile. Keep it away from high
temperatures and direct sunlight.
— Use the specified cleaning solution only. The head may be damaged
if other types of solutions are used.
— People with sensitive skin should use rubber gloves for protection.
— Do not use broken cleaning sticks with partially detached pads.
— Discared cleaning sticks after four to six uses. If the device becomes
extremely dirty, replace the cleaning stick after one use.
Replacing the Tape Cartridge
The DEFINITY LAN Gateway system maintains a count of write passes on a
working tape cartridge. When this count reaches 150, a warning alarm is raised
(FROM DEF AUDIX - WHAT TO SUBSTITUTE?) At this point, the cartridge
should be replaced. The system administrator must do this job.
1. NEED PROCEDURE
4-14 Issue 1 January 1996