Adjustment | Chapter 14: |
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Adjustment
Three adjustments are required. To implement these, the following instructions should be carried out:
1.Monitor the output using a deserializer and digital to analog converter and a video monitor.
2.Select a D1 source, as well as 270 Mb/s standard. Adjust R63 to provide a stable picture and stable sync waveform at TP15. To set the PLL more accurately measure the voltage at TP19.
3.Adjust R63 clockwise until lock is lost; then turn R63 counterclockwise until lock is obtained and regained after removal/ replacement of the input signal. Record this voltage as VLow.
4.Set the voltage at TP19 to be VLow +0.2 Volts.
5.Select a D2 NTSC source, as well as 143 Mb/s standard. Check that this results in a stable picture and sync waveform at TP15
6.Select a D360 source, as well as 360 Mb/s standard.
7.Adjust R74 to provide a stable picture and stable sync waveform at TP15. To set the PLL more accurately, measure the voltage at TP19, adjust R74 clockwise until lock is lost, then turn R74 counter clockwise until lock is obtained and is regained after removal/ replacement of the input signal.
8.Record this voltage as VLow.
9.Set the voltage at TP19 to be VLow +0.2 Volts
10.Select a D2 PAL source, as well as 177 Mb/s standard. Check that this results in a stable picture and sync waveform at TP15. If a D360 source is not available, adjust at 177 Mb/s instead.
11.Adjust R110 to provide an output level (if GS9009 is fitted) of 800 mV.
6800/7000 Series - Distribution and Routing Products Installation and Operation Manual | 119 |
