Marantz CD63 & CD67 mods list - Page 1549 - diyAudio
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Old 11th January 2011, 04:57 PM   #15481
6h5c is online now 6h5c  Netherlands
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Cleaning them is not such a bad idea, after all there's still a laser shining on the disc surface, and any stray light caused by a film of dirt will affect the HF signal. Most stuff is perfectly technically explainable.

Funny how the CD has a digital character, but a lot of technique behind it is just analog
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Old 12th January 2011, 08:31 AM   #15482
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hi ray, ive done some simple mods ie op amps lm4562s iec mains conversion and damped the case and transport on my 63se is hdam by pass next to do

many thanks alan
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Old 14th January 2011, 02:50 PM   #15483
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I was posting about something else, but just in case Ray is busy bikeral. I think he will say yes. Once you have good op-amps the hdam is only making things worse. I think you will find the procedure on page 1 and 2 of the thread.
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Old 14th January 2011, 03:00 PM   #15484
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Does anyone know where I can buy original vam lasers from on-line. Every time I think iv'e found one I end up with a non-working chinese copy. My cupboard's full of them. There used to be a time when they came in a philips fawn box and with wires. I now find the same is happening with the Sony lasers too. I'm not trying to get them cheap, just real!
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Old 14th January 2011, 03:33 PM   #15485
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bikeral, your next job should be some power supply work. Try adding 7805 voltage regulators on each of the DAC, decoder and servo supply voltage pins. After that you could bypass the HDAM a bit more safely.
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Old 14th January 2011, 03:49 PM   #15486
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Quote:
Originally Posted by barry.childs View Post
Does anyone know where I can buy original vam lasers from on-line. Every time I think iv'e found one I end up with a non-working chinese copy. My cupboard's full of them. There used to be a time when they came in a philips fawn box and with wires. I now find the same is happening with the Sony lasers too. I'm not trying to get them cheap, just real!
If you have a cupboard full of old lasers, check out the threads on repairing them - worth a try.

Stripdown/Clean of CDM12.4

Seems a lot of working drives have been thrown away when all they require is cleaning on the underside of the lens.

You've got to have good eyesight and a steady hand though !


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Old 14th January 2011, 07:03 PM   #15487
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often on those chineese lasers, all thats needed is the spindle needs lifting slightly.

Worth a try if you have several. I've had a few that just dont work, but I've neve had one that didn't after adjusting the cd mount on the end of the spindle. They've normally be squashed at some point an a small screw driver to lever then up a fraction is enough. Make sure you apply pressure evenly all the way round!!!
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Old 14th January 2011, 10:44 PM   #15488
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cheers barry, simon ive got some lm340 s do the same job wont they was gonna use them in the psu with some lm 317 s tho
cheers guys
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Old 14th January 2011, 10:53 PM   #15489
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yam yam 0770 on ebay is selling vam 1202s dunno if there copies tho cheers
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Old 15th January 2011, 01:19 PM   #15490
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Thanks everyone for your input. I'll try sripping and cleaning the old ones and look at the spindle position before I chuck them. Cheers
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