Hi all.
Receive a warm greeting.
I have a centralized power source for CCTV. Model SP200B S88
New, zero use.
It turns out that the CCTV HD cameras were connected, most of the cameras present noise in the image seen on the monitor.
Check, grounding, interference with other electrical cables in relation to the video cable, etc.
The source was replaced by another and the cameras worked perfectly.
Now checking at the plate level this source, everything looks good, suspecting that it was a problem of line filtering, replace the 3 capacitors of the output. (2200uf x 25v). It did not solve the problem.
Then I went to the primary session, replace the capacitor (CT) of the KA7500B that sets the working frequency. It did not solve the problem.
I also changed the capacitors of the primary 470uf x 250v x 560uf x 200v which was the ones I had at hand (Then I install the originals).
Change the capacitors that are associated with the primary transistors / mosfet. 4.7uf x 50v.
In red of one of the images, mark the components that I changed.
I consult here because I do not want to disassemble half of the source and affect the PCB tracks, just because I am doing trial and error.
They have any suggestions that may cause the interference problem.
Note: The power source does not vary the voltage before a load of more than 6 amps. The voltage is very stable, zero noise, hum or others.
Thanks.
Receive a warm greeting.
I have a centralized power source for CCTV. Model SP200B S88
New, zero use.
It turns out that the CCTV HD cameras were connected, most of the cameras present noise in the image seen on the monitor.
Check, grounding, interference with other electrical cables in relation to the video cable, etc.
The source was replaced by another and the cameras worked perfectly.
Now checking at the plate level this source, everything looks good, suspecting that it was a problem of line filtering, replace the 3 capacitors of the output. (2200uf x 25v). It did not solve the problem.
Then I went to the primary session, replace the capacitor (CT) of the KA7500B that sets the working frequency. It did not solve the problem.
I also changed the capacitors of the primary 470uf x 250v x 560uf x 200v which was the ones I had at hand (Then I install the originals).
Change the capacitors that are associated with the primary transistors / mosfet. 4.7uf x 50v.
In red of one of the images, mark the components that I changed.
I consult here because I do not want to disassemble half of the source and affect the PCB tracks, just because I am doing trial and error.
They have any suggestions that may cause the interference problem.
Note: The power source does not vary the voltage before a load of more than 6 amps. The voltage is very stable, zero noise, hum or others.
Thanks.
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