Troubleshooting 
7-6 
No. Symptom  Possible Cause  Solution 
4  The control panel has 
no response when it is 
operated. 
1.  The software fails. 
2.  The power cord of the 
control panel cannot 
work. 
3.  The serial port cable of 
the control panel cannot 
work. 
4.  The control panel is 
wrong. 
1.  Restart the system. 
2.  Replace the power cord of 
the control panel. 
3.  Replace the serial port 
cable of the control panel.
4.  Replace the control panel.
5  The trackball has no 
response when it is 
turned. 
1.  The software fails. 
2.  The connection cable of 
the trackball cannot 
work. 
3.  The trackball is wrong. 
1.  Restart the system. 
2.  Replace the connection 
cable of the trackball. 
3.  Replace the trackball.