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Getting to Know the PG 720
3.4
Trackball
Trackball
The trackball is a pointing device for cursor control and menu selection
in many programs that support mouse operation. By moving the
trackball, the cursor can be positioned anywhere on the screen.
By pressing the left-hand button, you set a marker. The function of the
right-hand button depends on the particular program you are using. You
can select objects or items in a menu and start functions with the
trackball.
Cleaning the
The trackball is in a roller housing which normally prevents dust
Trackball
collecting on the ball or transmission mechanism. Nevertheless, you
should clean the trackball at regular intervals.
To clean the trackball, proceed as follows:
1. Switch off your programming device.
2. Remove the cover of the trackball housing by turning it
3. You can now take the trackball out of its housing.
4. Wash the trackball in a solution of tap water and mild cleansing
5. Blow any residual dust out of the trackball housing.
6. Dry the trackball and return it to its housing.
7. Replace the cover and tighten it by turning it in a clockwise
3-14
anti-clockwise, for example by inserting tweezers or a similar tool
into the holes in the ring.
agent.
direction.
PG 720 PII Programming Device
C79000-G7076-C756-02
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