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 Post subject: [DVL-919] Skipping back
PostPosted: 15 Apr 2021, 14:18 
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Hello!
I recently found a DVL-919 at Goodwill ($13 :mrgreen: ) in great condition. It seems to be affected by the back-skipping every few minutes (especially towards the end of the disc). And it also seems to be around the same area on both sides, and I have tried multiple discs. It FF just fine. I've taken everything apart, cleaned the rails and regreased, gears, etc, checked for particulates, or burrs. Didn't seem to work, and I even ended up changing the gear mount from the DVD unit to the LD incase the gears were that bad. I thought it had worked, but still seems to do it.
I have a few questions:
I used Superlube, not lithium grease, would that cause sticking?
The cog track seems to be 1-2 mm above the bottom (and rather stiff when I push down on it), should it be flush?

If there are any other suggestions please let me know. I am about ready to desoldier the motors to switch them out, but I dont think it is the culprit, since its usually around the same position (I've seem Keanu Reeves try to get on the bus from Speed about 100 times).

edit: quick thought, I didnt have the OG remote, but programmed my Logitech Harmony with the correct codes. Is it possible to be stuck on repeat, and is there a way to factory reset?

Thanks!
-Max
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 Post subject: Re: DVL-919 skipping back
PostPosted: 15 Apr 2021, 16:05 
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I just found this thread and will try it tonight, although it skips on A as well as B, which is why I didnt try it.

[DVL-909] Issues with first minute of side B?

Wish me luck.
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 Post subject: Re: DVL-919 skipping back
PostPosted: 15 Apr 2021, 17:31 
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imax wrote:
I am about ready to desoldier the motors to switch them out

Don't do this.

Will it play a CD?
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 Post subject: Re: DVL-919 skipping back
PostPosted: 15 Apr 2021, 18:37 
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Sorry, I was half joking. I haven't tried CDs yet, it worked fine with dvds, and didn't even think to bother (doh)! I'll try tonight.
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 Post subject: Re: DVL-919 skipping back
PostPosted: 21 Apr 2021, 00:13 
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cplusplus wrote:
imax wrote:
I am about ready to desoldier the motors to switch them out

Don't do this.

Will it play a CD?



I just tried a CD (had to scrounge thru the drawers to find one) and it starts to stutter towards the end of the disc.
Alignment issues? And unfortuenatley I dont have an osc-scope or centering disc.

-Max
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 Post subject: Re: DVL-919 skipping back
PostPosted: 21 Apr 2021, 02:04 
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Look in SM for Side A centering adjustment screw.

Take a photo and/or mark current location. Without a scope it is tedious, but you can do trial and error extreme small turns left/right until the skipping on the CD is gone.
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 Post subject: Re: DVL-919 skipping back
PostPosted: 21 Apr 2021, 02:17 
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do you think tangental or centering is more likely?
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 Post subject: Re: [DVL-919] Skipping back
PostPosted: 21 Apr 2021, 02:29 
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Tangetial will affect picture quality, so you will see noise/crosstalk. You need to have a scope and test disc to set this, so I wouldn't touch it. Centering can be brute forced.
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 Post subject: Re: [DVL-919] Skipping back
PostPosted: 02 May 2021, 00:52 
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OK if you want a suggestion based on experience here's one: man up and accept the fact that after 23+ years in service both pickups have entered the final stage of their life cycle. The fact that you found the machine for a price of a cup of coffee should also be enough of a hint of its actual technical condition, no matter how good it may still look cosmetically though I doubt that too. Unless someone had previously literally thrashed the player there's very little to actually NO chance of THIS mechanism to be out of alignment to such an extent that the servo circuit is no longer capable of correcting minor alignment issues. It is always weirdly difficult to the majority of CD/LD/whatever optical device owners to accept the fact that the optical pickup is (almost) gone but the practice shows that the pickup is the actual and most often only culprit of all the optical players/recorders woes.
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 Post subject: Re: [DVL-919] Skipping back
PostPosted: 02 May 2021, 03:30 
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ldwrld wrote:
OK if you want a suggestion based on experience here's one: man up and accept the fact that after 23+ years in service both pickups have entered the final stage of their life cycle...

....Unless someone had previously literally thrashed the player there's very little to actually NO chance of THIS mechanism to be out of alignment to such an extent that the servo circuit is no longer capable of correcting minor alignment issues. It is always weirdly difficult to the majority of CD/LD/whatever optical device owners to accept the fact that the optical pickup is (almost) gone but the practice shows that the pickup is the actual and most often only culprit of all the optical players/recorders woes.



Honestly speaking, I really can't "totally" agree with that assessment. Sometimes there are obvious signs that a laser pick-up has hit it's last leg but sometimes it's surprising what else could happen to cause these issues.

Case in point, I purchased a CLD-D704 probably about 20 years ago (so that made it about six years old @ the time) that had similar skipping issues that affected both sides but probably more so on Side B. I took it to a shop that in the past had a great reputation for fixing LD players and after about a month waiting for a diagnosis the guy tells me it's a laser pick-up and the cost would be $400. Obviously, I wasn't going to pay that much for it and decided to just keep it around for now and maybe make it a parts machine. A few months later, I picked up a perfectly working CLD-D703 and decide to compare it w/ my 704 to see if maybe I can spot an issue. To my surprise, I did find something obviously wrong in that the entire transport mechanism of the 704 was slightly tilted vs the completely straight one on my 703. So like any idiot, (this was 20 years ago ;) ) I decided to just take a chance and literally bent that mechanism with my bare hands and got it to perfectly match the 703. Low and behold, the 704 stopped skipping and it has been perfect ever since. As for the repair guy saying it was the pick-up being bad, he probably just told me that because he just didn't want to work on it (his business by this time had changed and I think his LD specialist no longer worked there).

Anyway, I'm not saying that this DVL unit might have the same issue (could be worth a look) but I would think it's not very likely that two laser pick-ups in the same unit could go bad unless this player had so many hours on it for both LD/CD and DVD playback (usually I find that most people use one format more than the other so there would be an unevenness for wear and tear). In addition, from what I have read on the forum and other internet searches, most DVL units seem to have a dead DVD pick-up over the LD/CD pick-up.


ldwrld wrote:
The fact that you found the machine for a price of a cup of coffee should also be enough of a hint of its actual technical condition, no matter how good it may still look cosmetically though I doubt that too.


Not totally true as well. A Goodwill wouldn't have any idea of what the value of many of their sale items would be and probably just priced it low to get rid of it quickly.

Also, I picked up a very pristine CLD-M90 also about 20 years ago for $15 and the only complaint the guy selling it to me had was that it had a wonky loading issue (obviously a bad loading belt) and it has basically been a perfect machine for me since that time (except a minor CD skipping issue I had recently that has been resolved with some lubrication and a new sled belt). But yeah, it's 30 years old and I don't expect it to have laser issues but you never know.


Last edited by ldfan on 02 May 2021, 21:24, edited 1 time in total.
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 Post subject: Re: [DVL-919] Skipping back
PostPosted: 02 May 2021, 21:09 
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I think a lot of DVLs left factory not optimally aligned...
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 Post subject: Re: [DVL-919] Skipping back
PostPosted: 03 May 2021, 00:26 
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cplusplus wrote:
I think a lot of DVLs left factory not optimally aligned...


I believe this is the case with some of the 70x series of players, I sort of remember Grasshopper saying something like this.
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 Post subject: Re: [DVL-919] Skipping back
PostPosted: 03 May 2021, 03:19 
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cplusplus wrote:
I think a lot of DVLs left factory not optimally aligned...


Is that supposed to be a joke? Have you ever been to or at least seen a Pioneer or any other major manufacturer's plant? One thing to remember when it comes to machines of that period is they were all made completely domestically (that is in JAPAN) with very little to none imported parts and NO foreign labor involved. That also means JPN domestics standard of quality control.
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 Post subject: Re: [DVL-919] Skipping back
PostPosted: 03 May 2021, 03:41 
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ldfan wrote:
I purchased a CLD-D704 probably about 20 years ago (so that made it about six years old @ the time) that had similar skipping issues


Yeah sure. That was TWENTY years ago. If you believe nothing's changed , aged, got worn out etc. in those 20 years you are already living in the perfect world.

ldfan wrote:
A Goodwill wouldn't have any idea of what the value of many of their sale items would be


Maybe if this certain outlet is mostly staffed with those part time workers who barely understand English. However, the machine had somehow ended up in that outlet which means someone brought it there for some reason and not bothered to put it up on the BAY. None of the staff also bothered to part with some pocket change and put the item on the bay with the initial bid as low as say twice the money paid. Why? Whenever a scenario like this one plays out I tend to believe the reason NOT to put an item on the BAY is strong enough to, well, NOT put it on the bay... What I'm saying is, it is no longer 1992 believe it or not and people are much smarter now that they used to be.

ldfan wrote:
I picked up a very pristine CLD-M90 also about 20 years ago for $15 ...it's 30 years old and I don't expect it to have laser issues but you never know.


I know. I Also know what $15 could buy me 20 and 30 years ago. Basically nothing good is gained with age be it actual dollar value or mechanism condition or other much more important things.
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 Post subject: Re: [DVL-919] Skipping back
PostPosted: 03 May 2021, 04:17 
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Going back to my 704's alignment issue, I believe the reason it probably ended up that way was due to the typical issues back in the day of auto reverse players being tossed around by delivery people. And as the machines began to get lighter in the later years, they also became even more fragile to having certain parts getting bent up more easily.

So yes, I wouldn't be surprised if a DVL unit could especially have been subjected to this kind of "roughing up" and that might also explain their propensity to have more playback issues with their tighter tolerances vs. a CLD unit.

Once again, I encourage everyone to try and not ship a player if at all possible :roll: .
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 Post subject: Re: [DVL-919] Skipping back
PostPosted: 03 May 2021, 17:12 
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ldwrld wrote:
cplusplus wrote:
I think a lot of DVLs left factory not optimally aligned...
Is that supposed to be a joke?

No. Perhaps "a lot" was poor word choice, but it seems they consistently fail the vertical bar test.
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 Post subject: Re: [DVL-919] Skipping back
PostPosted: 03 May 2021, 18:01 
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ldwrld wrote:
cplusplus wrote:
I think a lot of DVLs left factory not optimally aligned...


Is that supposed to be a joke? Have you ever been to or at least seen a Pioneer or any other major manufacturer's plant? One thing to remember when it comes to machines of that period is they were all made completely domestically (that is in JAPAN) with very little to none imported parts and NO foreign labor involved. That also means JPN domestics standard of quality control.


I don’t deny how good the quality standards would be for a machine leaving the factory properly calibrated. However, it’s what happens after leaving is the bigger issue. I’m sure shipping people are not as concerned about taking extra care to not throw a device around as it makes its way across the pond.
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