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19.4.5  Testing the brightness of LED [Light Test] 
Test the brightness of the LED of the operation unit. 
1  Click on the [Menu] button on the left Tool Bar. 
The menu is displayed. 
2  Click on the [Maintenance] - [Selftest] - [Light Test] button on the menu. 
3  Click on the [Light Test Start] button. 
A LED brightness test starts. All the available brightness levels can be tested by increasing the 
level from 0.