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It is currently 19 Apr 2025, 00:38
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chrisw6atv
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Post subject: Re: An alternative to an unavailable Reference Disc [GGV1069  Posted: 14 Mar 2025, 09:24 |
Serious fan |
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Joined: 28 Sep 2023, 06:27 Posts: 207 Location: United States Has thanked: 110 times Been thanked: 70 times
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Hi, 99percent-
Welcome to the LDDB Forum!
Thank you for posting the notes about the Pioneer reference discs. I had speculated whether non-reference discs could be used for at least reasonable if not perfect adjustments and alignment. I appreciate that you confirmed this.
I have not yet done any alignment work on any of my players (at least, not since my VP-1000 in the early-to-mid-1980s), so I read the procedures in the service manual for the CLD-D704. Beside the crosstalk adjustments and signals that have been mentioned in other topics here, I see only a few other frames mentioned that are needed, and one of those is the "staircase" gray-scale video test pattern that is also available on the A Video Standard and Video Essentials discs as you mentioned.
I have a few Standard Play/CAV 8-inch music discs, but if a karaoke disc will potentially be better (for the crosstalk adjustments most likely, perhaps using changing on-screen lyrics as a substitute for the black bars on the reference disc frames), I will look for any of those that are in CAV format, when I eventually do some alignment work.
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99percent
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Post subject: Re: An alternative to an unavailable Reference Disc [GGV1069  Posted: 17 Mar 2025, 05:55 |
Third post and above |
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Joined: 14 Mar 2025, 07:23 Posts: 5 Location: United States Has thanked: 0 time Been thanked: 5 times
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krbahr wrote: In many older players the 8" disc is required as the 12" disc covers the adjustment pots. It is true that if you find a CAV disc with three frames next to each other that have drastically different video patterns toward the inner portion of the disc you can perform much of the alignment. This is what frames 114/115/116 provide on the Pioneer test disc.
The other specialty of the Pioneer disc is that not all discs are pressed the same, though within the specification tolerances, and Pioneer guarantees their disc are pressed with the proper depths to ensure the player can operate on all discs pressed within the LD specification. Disc's like "A Video Standard" were also pressed with high quality control, biggest issue is that it is a 12" disc and while you can get to the adjustments on the newer players it covers the adjustments for older models. Exactly. You hit the bullseye. I have a CAV 8" that is a catalog of laserdiscs from 1993 that basically works. Not as good a 114/115/116 of the officially unavailable test disc but better than nothing.
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chrisw6atv
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Post subject: Re: An alternative to an unavailable Reference Disc [GGV1069  Posted: 29 Mar 2025, 08:00 |
Serious fan |
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Joined: 28 Sep 2023, 06:27 Posts: 207 Location: United States Has thanked: 110 times Been thanked: 70 times
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99percent wrote: Anyone know what causes these extremely annoying video artifacts? I recommend that you make a new topic, for this question, because it is not related to this existing topic (reference discs). A few more details will be helpful, too: Do you see this on more than one disc? Can you take a picture of the problem from your TV set's screen and include it in your new post? If the "annoying artifacts" are a horizontal bar/area of "snow" that starts at one position on screen in the beginning of a disc and then the bar starts to "roll down" the screen and reappear at the top (and does this faster as the disc continues to play), that is a classic case of "laser rot". But no two discs will be the same.
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