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Old 18th February 2013, 09:01 AM   #19061
luke2fr is offline luke2fr  France
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Thanks for the hint.
Well, I've totally dismanteled it on saturday. Cleaned it, and added a bit of grease. Then I put everything back in place, and tested it : no more problem fully listenning at 5-6CDs at least.
Then Sunday, it started again, and by the end of the day, it was even worse. So I'm thinking about opening it again, and cleaning again but not add any grease, just perfect cleaning.
I also started modding it... I disabled the headphone circuit as suggested by Ray and many other : "Disable headphone circuit: remove C901/902 (signal) and jumpers U271/272 (+/- 12V)."
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Old 19th February 2013, 10:28 PM   #19062
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Well, after looking carefully at the circuit diagram in the service manual I have located the trimming VR in the laser unit (which I initially thought that was a fixing screw ).
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Old 20th February 2013, 05:53 AM   #19063
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If you have to trim it then it's days are probably numbered. Best get to work on sourcing a replacement, if you haven't already.
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Old 20th February 2013, 06:52 AM   #19064
UV101 is offline UV101  England
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What Ben said /\
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Old 20th February 2013, 09:35 AM   #19065
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I have just changed my CD drive with a brand new VAM 1201 but unfortunately there are skipping issues (sometimes) in certain tracks when playing back CDs.

With my ohm meter in hand I found the total resistance of the trimming VR was 8.8K and the stock setting was half which is 4.4K. I then turned the VR clockwise by a small bit to make it 4.9K which I believe has slightly increased the laser diode voltage. With that there is no more skipping of tracks
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Old 20th February 2013, 09:39 AM   #19066
luke2fr is offline luke2fr  France
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Where is that VR ? I'd like to check it.
I've played just one CD yesterday evening, but it didn't skip at all.
I've already ordered a VAM1201, but if my pb can be solved with a good cleaning (not yet done) and a VR adjustement
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Old 20th February 2013, 10:08 AM   #19067
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Quote:
Originally Posted by luke2fr View Post
Where is that VR ? I'd like to check it.
I've played just one CD yesterday evening, but it didn't skip at all.
I've already ordered a VAM1201, but if my pb can be solved with a good cleaning (not yet done) and a VR adjustement
Just take out the entire drive and invert it and look at the bottom side of it. You will see the brown color flexible PCB of the laser unit and in the middle of it you will see something like a small screw (that was what I had thought initially) but if you look at it carefully it is actually a trimming VR with 3 connections. Before you adjust it use a ohmmeter to note down the stock resistance so that you can revert it back if you wish. Then turn the VR by a small bit clockwise and measure the resistance. Don't turn the VR by too much as a high voltage to the laser diode will shorten its life. Hope the above can help and please report back if the problem of skipping is solved.
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Old 20th February 2013, 10:42 AM   #19068
UV101 is offline UV101  England
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That vr is factory set. Increasing it without using a test disc and a scope will short life the new laser (i know this from personal experience)

Its more likely that the height of the CD mount on the spindle is incorrect and lifting it slightly away from the mech will give the same results. All the problematic mech's I've had (apart from the one where I blew up the diode) have been resolved this way.
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Old 20th February 2013, 10:55 AM   #19069
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Quote:
Originally Posted by UV101 View Post
That vr is factory set. Increasing it without using a test disc and a scope will short life the new laser (i know this from personal experience)

Its more likely that the height of the CD mount on the spindle is incorrect and lifting it slightly away from the mech will give the same results. All the problematic mech's I've had (apart from the one where I blew up the diode) have been resolved this way.
Good suggestion
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Old 22nd February 2013, 07:03 AM   #19070
ColinA is offline ColinA  United Kingdom
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Hi
I want to fit new phono sockets to the case of my cd67.
The HDAMs are bypassed as per previous posts.

I intend taking a wire from the start of U216 / U217
(op amp output) to the sockets with a 200r resistor to replace R657 - R690

Does this look ok?
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