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Old 14th October 2013, 04:48 PM   #19821
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by scumble View Post
How do you adjust the height relative to the laser? I saw no obvious way to do that - the cone seems to be fixed on the motor spindle.
It is "fixed" by a blob of "glue" which you can see on the top of the cone. I have had one where the glue was missing and the cone pushed right down (binding).
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Old 14th October 2013, 07:36 PM   #19822
scumble is offline scumble  United Kingdom
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Originally Posted by Mooly View Post
It is "fixed" by a blob of "glue" which you can see on the top of the cone. I have had one where the glue was missing and the cone pushed right down (binding).
The cone just looks like this (attachment). Just a black indented bit in the centre.

I still suspect mechanical problems - I seem to get skipping at the same point around 10 minutes into the disk, as if the laser is getting a little bit stuck on the metal rod. Still I don't really know enough about how it works, just that initially lubrication was required for the unit to even work at all.
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Old 14th October 2013, 08:27 PM   #19823
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Quote:
Originally Posted by scumble View Post
The cone just looks like this (attachment). Just a black indented bit in the centre.

I still suspect mechanical problems - I seem to get skipping at the same point around 10 minutes into the disk, as if the laser is getting a little bit stuck on the metal rod. Still I don't really know enough about how it works, just that initially lubrication was required for the unit to even work at all.
The cone is slide fit onto the motor spindle. It is a bit tight. What you need to do is to use a small screw driver inserting into the cone's gap and force the cone out a bit. If it is too much press the cone down by your finger.

If your CDP skips always on the same position it appears to me that something has blocked the laser head's slide smooth movement. It is most likely caused by hardening of the grease on the gears or along the sliding rod. I also encountered similar problem before and I just disassembled the sliding mechanisms and the gears out, clean them with highly evaporated solvents (like contact cleaners) and re-grease the moving parts. Problem solved.
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Old 15th October 2013, 08:19 AM   #19824
scumble is offline scumble  United Kingdom
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Originally Posted by higlander View Post
The cone is slide fit onto the motor spindle. It is a bit tight. What you need to do is to use a small screw driver inserting into the cone's gap and force the cone out a bit. If it is too much press the cone down by your finger.

If your CDP skips always on the same position it appears to me that something has blocked the laser head's slide smooth movement. It is most likely caused by hardening of the grease on the gears or along the sliding rod. I also encountered similar problem before and I just disassembled the sliding mechanisms and the gears out, clean them with highly evaporated solvents (like contact cleaners) and re-grease the moving parts. Problem solved.
I'm just a little cautious about taking the VAM apart. The only lubricant I have put on it is WD40, which has nearly got things working smoothly, but not quite. I don't think there was any grease on it at all when I got it. I have left the machine shuffling overnight to see if that helps distribute the lubricant.
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Old 15th October 2013, 10:35 AM   #19825
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Yes WD40 is able to dissolve some sticky stuff. You may wait for a day and try to move the laser head backward and forward and see if things can improve.
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Old 15th October 2013, 02:55 PM   #19826
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Originally Posted by higlander View Post
Yes WD40 is able to dissolve some sticky stuff. You may wait for a day and try to move the laser head backward and forward and see if things can improve.
I had a practice run on the old unit taking it apart, which was fiddly but not impossible. So with this confidence I went to the new unit. Given what I know now I'd have probably replaced the laser into the old unit, as it seems to be better quality. However I did swap the large gear and the cone out, and used the metal bar from the old unit.

I don't seem to have a disc-loading problem now. Some discs were landing in the clamp at an angle and wobbling about, but it looks like the cone part from the old unit is more accurately constructed. I cleaned the bar with an alcohol wipe and sprayed more WD40 on, but perhaps silicone grease is better. There was some white residue on the old unit.

There are still some skipping points but I've only just put the recombined VAM back in. Tantalisingly close to a fully functioning CD player.

Frustrating that it has to depend on a cheap laser pickup...
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Old 15th October 2013, 05:57 PM   #19827
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That black blob in your picture is the glue.

Its worth looking at, and cleaning all the teeth on the gears. The large gear is a "clip fit" on the spindle so should come off easily. Also clean the worm gear on the sled motor. The only lubricant I would use is a special plastics grease like this,

SPG35SL - ELECTROLUBE - SPECIAL PLASTICS GREASE, 35ML | CPC From This Range&MER=e-bb45-00001003

If it sticks as a specific point then that points to something physical such as a burr on a gear tooth etc.
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Old 15th October 2013, 07:32 PM   #19828
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Originally Posted by Mooly View Post
That black blob in your picture is the glue.

Its worth looking at, and cleaning all the teeth on the gears. The large gear is a "clip fit" on the spindle so should come off easily. Also clean the worm gear on the sled motor. The only lubricant I would use is a special plastics grease like this,

SPG35SL - ELECTROLUBE - SPECIAL PLASTICS GREASE, 35ML | CPC From This Range&MER=e-bb45-00001003

If it sticks as a specific point then that points to something physical such as a burr on a gear tooth etc.
Well it can skip in the same sort of area but still play without skipping over the same part of a disc after a couple of retries. As I said I managed to take the VAM apart and put it back together, pulled the gear off etc.

I'll try the synthetic grease next as WD40 doesn't stay put for very long.
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Old 15th October 2013, 08:17 PM   #19829
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Originally Posted by scumble View Post
Well it can skip in the same sort of area but still play without skipping over the same part of a disc after a couple of retries. As I said I managed to take the VAM apart and put it back together, pulled the gear off etc.

I'll try the synthetic grease next as WD40 doesn't stay put for very long.
Glad to see you now have the confidence to take apart the whole laser unit. Actually it is not difficult as long as you do it step by step and just be a bit gentle you will be alright then. Well done !!

I would suggest you also try the service mode by pressing the STOP button and the NEXT button together. Switch to different Modes to move out and move in the laser head. This will run in the gears and the slides.
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Old 15th October 2013, 09:39 PM   #19830
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20131015_221200.jpg This is the clamp off an original Phillips laser mech.

20131015_221042 (2).jpg This is off a Chinese copy.

The small collar next to the original goes onto the spindle first, stopping it going on too far. It fits upside down to way shown. Fat part uppermost. Chinese laser doesn't have one.
I had trouble with discs not reading and wobbling so much that you could hear them scraping.
The magnet in the original is also much stronger.
Swapping them over made a big difference.

Last edited by grofus; 15th October 2013 at 09:49 PM.
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