HP Compaq StorageWorks TL881 DLT Mini-Library - Manual (Page 72)

Installation 3-3
to help localize system failures. When installed, the motor drive assembly of
the Pass-Thru mechanism is directly behind the Expansion Unit.
Data Units and MiniLibrary Base Modules may be installed anywhere below
the Expansion Unit, in any order. There may be a slight performance
advantage in making the MiniLibrary Base Modules contiguous, but gaps are
permitted. The size of a gap is limited by the fact that each gap must be
bridged by some number of 7” Pass-Thru mechanism track sections. For
safety, available cover plates should be installed on all Pass-Thru mechanism
sections which are not connected to MiniLibrary System modules.
The Expansion Unit senses the position of each module during initialization at
power-up. Even if there are gaps between modules, the system will operate
correctly. If you plan to leave gaps between modules, be sure to order
additional Pass-Thru mechanism track segments and cover plates equal to the
length of the gap.
Mechanical Installation
Assembly of the Pass-Thru mechanism requires experience working with
moderately complex mechanisms, and the ability to follow directions
carefully.
Identifying the Parts of the Pass-Thru
Mechanism
Locate and identify the Pass-Thru mechanism internal and external parts. The
Pass-Thru mechanism is made up of the following external parts, shown in
Figure 3-1: