Removing, Inspecting And Installing The Rack Feed Assemblies - Bayer HealthCare Clinitek Atlas Service Manual

9-5

Removing, Inspecting and Installing the Rack Feed Assemblies

9-5-1
To remove, inspect and reinstall the two Rack Feed Assemblies (In Feed and Out Feed, see
Figure 9-4), do the following:
To remove the In Feed Assembly:
NOTE: Replace unit if repair is not feasible.
1. Turn off Rack Sample Handler instrument. Remove the Front Cover (item 5 on Figure 9-1) by removing
two small philips (or cross) screws (item 6) and two M3 x 12 metric allen screws (item 7).
2. Unplug the two cables (Motor CN200 and ORG1 sensor CN120) by pressing on the tabs on the white
plastic connectors to release their plugs.
3. Remove two M4 x 18 metric allen screws (item 32 on Figure 9-4) and attached hardware which holds the
Rack Feed (In Feed) unit to the instrument frame.
4. Gently pull or tug on the In Feed unit to remove its shaft (item 4) from the hole in the back wall. Then
carefully slide the In Feed unit out of the instrument.
5. Inspect the two steel shafts (4 and 35) for cleanliness. Clean both shafts with an alcohol wipe and place a
thin layer of light machine oil over the entire surface of each shaft. Rotate the Winding Drum (item 31)
back and forth to move the Slide Block (45) one complete cycle to evenly distribute the new lubrication.
DO NOT over-lubricate the shafts!
6. Inspect the two steels wires (items 36 and 37) for any frayed or damaged portions. Wire tension should
permit deflection of approximately one inch (25mm) from the center of this unit. Also inspect wire nuts
(item 23) at end of unit to verify hardware is all securely attached and compression springs (21) are not
damaged.
7. Inspect the Winding Drum (31) set screws. Set screw at flat portion of the motor shaft must be below the
surface of the drum by approximately 3mm. Set screw at round portion of the motor shaft must be below
surface of the drum by approximately 2mm.
If either set screw is loose, prepare screw threads with Loctite 425 Assure Sealant (or an equivalent metal
adhesive) and tighten screw until it is the proper distance below the surface of the drum.
8. Inspect the two white teflon Levers (5 and 44) to verify both spring back promptly when pressed down.
Also verify attached tensions springs (7 and 42) are properly installed and are not stretched out or
otherwise damaged.
Note the teflon levers do not require any lubrication and must be kept clean to operate properly. If levers
are clean but stick in the up or down position, adjust levers by loosening a metric M3 x 6 set screw (items
8 or 39). Place a gap of 0.05 mm (0.002 inch) between the Lever and Pin (items 6 or 43) and tighten the
set screw.
9-7