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In Reply to: RE: CD Player Laser Deterioration posted by Mushroom Soup on February 01, 2013 at 06:17:11
what laser mechanism your Denon uses ? I sold Harman Kardon which used a sony laser mechanism and I still have units in the field over 20 years old and still going strong, staill able to read CDR's and such.
One of the major issues with the CD players is that the laser lens is sort of like a camera,it has a difinite focal length. If your mechanism has a magnetic chuck, the constant opening and closing of the drwer nd the resultant slamming down of the clampiong mechanism tends to "hammer" the turntable dowm, and eventually it reaches the limit of the focal length. You will notice this first on the the data on the edges of the disc, where any eccentricities will be amplified.
Since the CD TT is simply friction mounted on the motor shaft, often times a gentle prying upward of the TT will place the surface of the CD back in the proper focal range.
good luck.
Stu
Follow Ups:
The service manual calls it a KSS-151A. A Sony device, perhaps?
That is definitely a Sony number. Most Sony lasers are easily replaceable.
That particular one unfortunately is obsolete and no longer available
is definitely Sony type part number.
Your original post was unclear about the issues you were having.Skipping, particularly at the outer edges of the disc? Can't read nurned disc?
Please elaborate a bit
Stu
Yeah, just like you said. It won't read a burned disc(that DiscSpeed says is 100% quality). I got some skips in the middle of a commercial disc but only once that so far.
Can you help me, doctor? I've got a cheap Sony machine with the same thing too...
Mush
Not too familiar with the 150 mechanism. Spent the night trying to locate a photo or replacement part with photos so I could see it and identify the mechanism
patience.....
Nt
the focusing servo motor is there for decoration, then. Oh well, another circuit needlessly added to add more cost to the consumer.
The servo acts like an auto focus so the laser doesn't a have a "definite focal length." I.e., it's variable.
mechanism has definite limits
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