2
2-16
Programming Device PG 740
C79000-G7076-C742-01
2.5
Trackball
The trackball serves as an input device for cursor control and menu selection
in many programs (with mouse operation). By moving the trackball, the
cursor can be repositioned on the screen.
By pressing the left-hand button, you set a marker. The right-hand button is
assigned differently according to the application. You can select objects or
items in a menu, and start functions with the trackball.
The trackball runs in a self-cleaning roller housing which is capable, under
normal conditions, of preventing dust collecting on the trackball and transfer
mechanism. However, you should clean the trackball from time to time.
Proceed as follows:
1. Switch off your programming device.
2. Remove the cover of the trackball housing by turning it counterclockwise;
for example, by inserting tweezers or a similar gadget in the holes in the
ring.
3. You can now lift the trackball out of its housing.
4. Wash the trackball with tap water to which a mild cleansing agent has
been added (Figure 2-14).
5. Clean the trackball housing (Figure 2-15).
6. Clean the rollers (Figure 2-16).
7. Dry the trackball and return it to its housing.
8. Replace the cover and tighten it by screwing it clockwise.
Trackball
Cleaning the
Trackball
Installing the PG 740