6-8 Service Guide
Digital Control Troubleshooting 8719ET/20ET/22ET
Display Troubleshooting (A18,A19) 8719ES/20ES/22ES
RF Network Analyzers
Dark Pixels Specifications
Dark “stuck on” pixels may appear against a white background. To test for these dots,
press the following:
In a properly working display, the following will not occur:
— more than 12 stuck pixels (not to exceed a maximum of 7 red, green, or blue)
— more than one occurrence of 2 consecutive stuck pixels
— stuck pixels less than 6.5 mm apart
Newtons Rings
To check for the patterns known as Newtons Rings, change the display to white by pressing
the following keys:
Figure 6-3 illustrates acceptable and non-acceptable examples of Newtons Rings.
Figure 6-3 Newtons Rings
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