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 Post subject: [DVL-909] Side B plays fine, but Side A is garbled
PostPosted: 30 Jun 2020, 04:47 
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Got my DVL-909 out of storage to use as a backup.

Seems that it won't correctly play Side A of LDs anymore (Side B seems fine, and Side A will play when manually flipping the disc, so it's a player issue and not a disc issue). The player seems to make a lot of seeking noises (but I don't think any louder than normal), then it will start playing at about 10 or so minutes in on a CLV disc, but there's no audio and the video is garbled. Doesn't seem like any error codes pop up.

When I try and skip chapters, the player tries to seek again, then the disc stops spinning and restarts, the player seeks again, and eventually starts playing toward the beginning of the disc (again with just garbled video). When I try the chapter skip with the cover off, I can see the laser moving frantically up and down as the pickup moves gradually back and then forward again. Doesn't look like there are any obvious internal problems, though.

Put a small bit of grease on the metal rail for Side A and adjusted the big white duckbill-shaped adjustment pot on the pickup about a quarter turn, but nothing seems to have changed. Should I try adjusting the big black pot (the one shaped like a dial)? Didn't have a big enough flathead screwdriver on hand to try turning it. I'm also unsure where else I could try adding grease, if any. The plastic rail for Side A seems to be mostly covered up by metal parts.

So far DVD playback seems fine, but when I put a CD in it wasn't even recognized (this was before I greased the rail and made the pot adjustments, though).
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 Post subject: Re: [DVL-909] Side B plays fine, but Side A is garbled
PostPosted: 01 Jul 2020, 01:34 
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You need to put it in test mode and do a side A alignment. Either the pickup lenses are not operating properly for side A so the RF signal returned is too weak or the alignments mainly tile and tangential angles, or spindle motor centering are bad and need to be adjusted back into specification.
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 Post subject: Re: [DVL-909] Side B plays fine, but Side A is garbled
PostPosted: 01 Jul 2020, 04:32 
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Thanks Kurtis. Will give it a try.

Took another look at the service manual and I can probably at least get it into test mode. Looked around the internet for alignment info and how to adjust the spindle motor, but couldn't find much.

Hopefully I can manage this without an oscilloscope, test disc, or service remote. Will try looking around for more info and maybe pictures/videos before I start.
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 Post subject: Re: [DVL-909] Side B plays fine, but Side A is garbled
PostPosted: 05 Jul 2020, 17:54 
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Watched the CLD-S104 video that Chad Page uploaded: https://www.youtube.com/watch?v=FIMBrbRPRro

I assume the adjustments are similar for the 909, and it looks like the the Test Disc is mainly used for adjusting crosstalk using the paused Frame 115, which looks like just a mostly-white screen. So that should be easy enough with a normal retail disc, right? (I have Video Essentials and a couple 8" discs, both CLV and CAV.)

I see that Kurtis mentioned in another thread that the test disc is also used for tilt adjustment, is there a way to adjust tilt without it? The CLD-D503 service manual looks to have a nice flowchart for adjusting tilt with a CD. Can I do this with the 909, and does it have to be the test CD? http://manuals.lddb.com/LD_Players/Pion ... l_Scan.pdf
(edit: I see that it thankfully doesn't need to be a test CD! krbahr @ R7G has trouble starting Side B and gets stuck. )

The CLD-604 manual also has nice adjustment instructions, can I use those as a rough guide?
http://manuals.lddb.com/LD_Players/Pion ... l_Scan.pdf

But whether I need a test disc or not, I guess I'll definitely be needing an oscilloscope. I could probably use it for some retro game stuff (like adjusting my Turbo Duo which has been recapped but the CD audio still stops playing randomly), anyway.

Went with a Hitatchi VC-6145 scope, was only $75 shipped but only partially tested. It does have an X-Y mode, so hopefully it will work out. Should arrive in a day or two.
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 Post subject: Re: [DVL-909] Side B plays fine, but Side A is garbled
PostPosted: 06 Jul 2020, 02:22 
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You have to do adjustments with a CAV recorded discs as the player is continually reading the data off the disc and displaying the picture being read even when paused. With a CLV disc when you pause you get the picture stored in the TBC memory and it does not refresh so you cannot see how your adjustment visually effects the picture.
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 Post subject: Re: [DVL-909] Side B plays fine, but Side A is garbled
PostPosted: 06 Jul 2020, 03:15 
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Ah, makes sense. I was under the impression that crosstalk was more common on CLV discs, but I'll worry about adjusting that later, will mainly be using this player for music LDs so don't mind if the PQ is slightly off.
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