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Decoder power source problem causing camera image emerge 50Hz interference fringe

Publication Date:  2012-09-22 Views:  120 Downloads:  0
Issue Description
When VP 2000 system use SONY 3ccd camera, terminal emerge 50Hz interference fringe.
Alarm Information
None
Handling Process
1. TV doesn’t connect RF cable, eliminate the RF problem.
2. Exam TV power supply, it is not interfered when receiving TV, and it means TV has no problem.
3. Replace camera source, only the assistant camera is interfered, the problem should be on power supply.
4. Open camera power source, install a 4700ufcapacitance on camera’s power source output side. Problem is solved
Root Cause
50Hz interference fringe means the power source smoothing has problem. The possible reason may be:
1. TV power source smoothing has problem.
2. TV may connect RF, RF brings 50Hz interference.
3. Camera’s power smoothing has problem.
4.  Long video cable brings power source problem.
Suggestions
None

END