User`s guide

2-12 Pass-Through Mechanism Expansion Kit Installation Instructions
Compaq Confidential – Need to Know Required
Writer: Don Kaplan Project: Pass-Through Mechanism Expansion Kit Installation Instructions Comments:
Part Number: ER-TL881-EA. A01/138255-001 File Name: C-CH2 UP.DOC Last Saved On: 5/13/99 10:01 AM
understand how to do the steps in this section. To add to an existing
mechanism you must first disassemble the mechanism partially, then make the
necessary changes using procedures described in the preceding sections. Do
the following steps.
1. Locate the support braces on the mechanism (Figures 2-1 and 2-4). To
remove the assembly from the rack disconnect the cable that is
connected to the motor drive assembly, then remove the two screws that
fasten each support brace to angle brackets at the ends. Pull the
mechanism straight back until it is clear of the modules.
2. Locate the safety covers over the drive motor section and the base
assembly. Note that the covers are held in place by nylon button rivet
fasteners. Using a suitable thin-bladed tool, pry up the cover until the
fasteners can be removed. Set the covers aside and save the fasteners for
later use.
3. Place the mechanism on a suitable work surface with the motor at the
left and pointed upward.
4. Open the door of the car to gain access to the captive screws (Figure
2-9), but do not remove the door. Loosen the captive screws until they
are disengaged from the belt block.
5. Grasp the far side of the car and pull it toward you to compress the
springs until the wheels on the far side are free of the track groove; then
rotate the far side of the car up, decompress the springs to free the
near-side wheels from their track grooves, and remove the car.
6. Locate the tensioner ramp in the base section (Figure 2-5). Compress the
spring until the hole in the tensioner ramp is aligned with a hole in the
base section. Insert an 0.050" Allen wrench or a paper clip through the
holes. This sets the idler pulley for zero belt tension.
7. Loosen the four screws on the belt block (Figure 2-8) enough so that
you can pull the ends of the belt free of the block.
8. Pull the belt free of the motor drive assembly and the base section and
set the belt aside.
9. Turn the mechanism over and support it so that neither the motor nor the
flange at the bottom of the base assembly is touching the work surface.
10. Remove the eight screws that hold a pair of tie bars in place and separate
the mechanism at that joint.
11. You can now add sections as needed and install a new belt, as described
in Assembling the Mechanism and Installing the Belt.
NOTE: If you are adding a section and do not intend to install a TL881 MiniLibrary module
in front of that section, regulatory agency safety regulations required that you install a
safety cover over the exposed section.