I am trying to tune up the cld-1950 player. When movies are played, the picture is very foggy and not clear.
I've moved the tilt offset, fcus gain, track gain and RF level potentiometers back and forth. Some improvement is appreciated, but without solving the problem. Should I move the rest of the potentiometers?
I would like to know if it could be a problem with the laser lens. By the way, is it possible to remove the white plastic cover that covers the lens for better cleaning? I have cleaned the lens with a cotton swab and isopropyl alcohol.
It’s probably not the laser. It’s almost never the laser.
I wouldn’t move a single potentiometer without service information, tools, and a test disc.
LD is 45 year old analog SD video and that isn’t a particularly high end deck to begin with. First and foremost: do you have enough experience with LD to know what kind of quality to expect? Are you trying to do the impossible?
EDIT: I watched the video, definitely a legit issue. Top Gun looks a little rotty. Noise everywhere. How many other discs do you have?
_________________ All about LD care, inner sleeves, shrink wrap, etc.
I don't have proper tools or a test disc. I have marked the place where the potentiometers were located before moving them.
All NTSC and PAL movies I've tried look similar. I have an extensive collection of titles and they look great on other players. It's not a disk rot problem.
I think the problem might be more in the processing stage as the picture (as well as sound from what little I can hear) are both terrible. There is probably nothing wrong with the laser pick-up or it’s adjustments.
I would look for dried capacitors first in the power supply stage.
Does CD audio have any distortion in the first or last track?
With no oscilloscope, an easy check is applying extremely small amount of pressure upwards or downwards (causing the large entire base to slightly tilt) on the silver rail the carriage rides along while a LD is playing and see if the video clears up. This can be risky so proceed with extreme caution if you decide to do so. Not sure if it is easily reachable. Maybe so with a 20cm disc.
In some cases, I have detected problems with a track and it may coincide more or less with the beginning or end of the discs. Manipulating the TRKG GAIN it seems that those jumps improve or disappear.
Complex access to the car while it works. What does that prove?
I have cleaned the video and audio outputs. I have tried all 3 possible video connections and I have also tried different cables. The result is similar.
I have had no audio problems on the last few music cds tested.
I'm beginning to wonder if the image problems are caused by some bad capacitor located in the power supply.
I would like to change the capacitors in the power supply. Does anyone know what they are?
I would like to change the capacitors in the power supply. Does anyone know what they are?
You just have to look @ each capacitor you plan to replace and see what voltage (v) and microfarad (uf) rating are printed on them. Hopefully one or more of these caps in the power supply is causing the issue but there is no guarantee it is the culprit. Still, if I was doing this repair and had no real clue on where to start, the power supply is a good first step.
The only alternative I can think of is to check the power supply capacitors and check the imaging boards. (VDTB-Assy, PALB-Assy, YCNR-Assy. Service Manual page 1-13 and 1-14).
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