Yamaha CDC-765 Skips First Three Songs on Disc - diyAudio
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Old 17th February 2015, 11:27 PM   #1
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Default Yamaha CDC-765 Skips First Three Songs on Disc

My 5 disc player has started to skip the first three tracks on the CD, doesn't matter which disc it is. Any ideas as to where I should start looking to solve the problem?
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Old 18th February 2015, 07:04 AM   #2
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Never worked on one of these but checking the sled assembly would be a good start. Make sure its free and that there is no old/hardened grease on any gears related to the sled.

Also check the RF quality with a scope. That should be part of any basic first test on a player.

If you can find no obvious reason then monitor the sled drive voltage during play. If it climbs steadily and then drops back as the sled jerks and skips forward then that's a good sign of mechanical problems (sled not free)
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Old 18th February 2015, 04:27 PM   #3
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The sled definitely jerks and skips forward when playing, I saw this when I had the cover off watching what it was doing.
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Old 18th February 2015, 06:48 PM   #4
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First steps then would be to confirm that the mechanics are 100% OK. That means removing and dismantling the sled assembly and cleaning it all up and relubricating with a suitable grease (I've never worked on one of these so can only give general advice). Old grease can harden, get contaminated, or deteriorate and get what are like small granules forming in it... these cause the small gears to jam momentarily, when the servo increases the drive then the sled jerks forward.

There may be other issues at work but you have to confirm the mechanical side of things is good first.
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Old 18th February 2015, 07:54 PM   #5
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Ok, I will remove the sled assembly, clean it up and re-lube. Any recommendations on the type of grease I should use?
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Old 18th February 2015, 09:57 PM   #6
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Best way I've found is to use a bit of IPA (isopropyl alcohol) on a cotton bud for cleaning, then re-lube with silicone grease as this won't harm plastics/rubber. Don't use mineral oil or grease based on this. I've not worked on your make of cd player, but my Marantz has had the same problem in the past and it's down to old/dried grease building up on the slider rod that the laser tracks along.
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Old 18th February 2015, 10:03 PM   #7
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I will give it a shot and report back. The player is 19 years old and probably has never been serviced by the PO.
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Old 19th February 2015, 06:37 AM   #8
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Quote:
Originally Posted by reaper996 View Post
Ok, I will remove the sled assembly, clean it up and re-lube. Any recommendations on the type of grease I should use?
The stuff I use is a special plastic/metal compatible grease,
Contact Lubricants - Other - Special Plastic Grease - SPG | Electrolube

Silicon lubes are fine as long as they are not to sticky and viscous.
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Last edited by Mooly; 21st February 2015 at 06:52 AM. Reason: Not added. Should read not to sticky
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Old 20th February 2015, 07:19 PM   #9
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Well I took the case off today and it looks to be a tracking issue with the horizontal toothed unit attached to the eye. As it tries to play the first track, the noise I am hearing is the gear on the right side teeth slipping as it is trying to move left, but hits a square clear plastic button below the metal frame. The square button is spring-loaded from what I can tell. Sorry, I don't know the technical names for these parts. So I presume that there is an alignment issue?

Here's a picture of what I have been talking about

20150220_125823.jpg
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Old 20th February 2015, 08:00 PM   #10
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Make sure the teeth are clean and don't use any lubricant as they are made from self lubricating plastic. You will probably find, knowing this assembly, one of the teeth is bent or there is some fluff/debris on the feed cog.
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