Question about Panasonic AG-DP800H Camcorder
Lines appear on the view finder when the camera is switched on. Before I begin to record I have to turn the camera on for about 15 minutes then the lines disappear. A technician told me it may be that the pulse power board may need replacing. Is he correct or is there another solution. I searched online for this board but cannot find it. If you can locate it please let me know the part number so that I can have this problem solved.
The cause of the horizontal lines on the AGDP800 camcorder are the Buffer Opamps that drive the reference for the three AtoD converters. Replacing C3703,C3706, and C3709 will normally stop it. However, the design is very susceptible to the characteristic of the capacitors (which are located right at the output of the Opamps). The source of the "lines" is actually a high frequency oscillation caused by the feedback mechanism used for the Opamps unity gain follower configuration. The ideal solution would be to place a small resistor (about 200 ohms) in series with the output of the opamps before the caps. This would isolate the capacitor from the feedback mechanism. I haven't done this for a supercam, but I have for similiar circuits.
I fixed a supercam with this problem and actually found that the capacitors that I replaced checked fine at audio frequencies. I consider this a design error. I can't believe that it is necessary to replace ALL the caps in other circuits as many suggest.
Posted on Oct 07, 2009
I found the solution!!
3 electro chemical capacity in the 3700 series on the camera head board.
change the chemical rear the DAC and above the ADC for process digital signal.
The name of the capacity: c3 c6 c9 in the 3700 section on process board.
The capacity is a part of filter the reference signal out of the DAC for ADC reference for ic1 ic2 ic3...
If the capacity is dead a sinusoidal signal appear for the red blue and green reference voltage and the result is a parasit signal into all camera.
You can measure a 50khz signal on the composite video signal.
Posted on Sep 28, 2009
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Posted on Jan 02, 2017
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