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Old 29th November 2002, 12:25 PM   #11
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" 14.8) Audio whine (not from speakers) and/or muddy sound with Sony CD players


Generally, the only symptom is a CD players that sounds unhappy - there are
no audio or tracking problems. However, in severe cases, there may also be
audio degradation described as "muddy sound".

(No doubt, a non-Sony approved weight would work equally well for the solution
below.)

(From: Lance Edmonds (lanceedmonds@xtra.co.nz)).

The whine problem usually occurs with KSS240A and KSS213A optical pickups, and
is caused by a mechanical resonance. There are at least 2 service bulletins
describing the fault and the cure.

Sony sells a special weight to fit to the pickup, and also a felt pad to add
to the bottom of the top clamp assembly. Both these items cure this problem.
Some machines may only require the weight.

In rare circumstances the resonance can interfere with the tracking/focus
servos enough to cause skipping. Usually the problem is not easily repeated,
however certain light weight disc's may trigger the problem repeatably.

Note that the resonance usually only occurs on the first few tracks if at all,
and some disc's will play with the problem never showing up. Seems to be a
disc weight/thickness/density problem.

Contact your official Sony service office for the part numbers etc."
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Old 29th November 2002, 12:27 PM   #12
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Default exceptions confirm the rule

What has this to do with laser current ?
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Old 29th November 2002, 12:29 PM   #13
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Nothing, but it may be what the problem actually is...
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Old 29th November 2002, 12:31 PM   #14
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OK, thanks anyhow for the info. Did not know this about Sony lasers. I am used to Philips ones.
Saved the info just in case
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Old 29th November 2002, 12:32 PM   #15
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I just searched on google... I don't even know what it means.. lol
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Old 29th November 2002, 12:33 PM   #16
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Wink you're not serious are you ?



Before I am being accused of threadjacking:

Duo, does the info Skinnyboy supplied apply to the laser of your Sony player ?
If not, what about buying a new laser ? They are not that expensive nowadays. Replacing them is not very hard to do.
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Old 29th November 2002, 01:42 PM   #17
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BTW:

I got from a friend an Yamaha CDX-810 with a worn out "press plate" or what you call it. A mechanism which presses the CD towards the platter. The upper part has a single ball point bearing. When the press plate has got a pit from the steal ball, the laser starts to dance "jenka". If you make the press plate press harder, it won't help.

Have you checked the mechanism for holding the CD tight?
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Old 29th November 2002, 01:56 PM   #18
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I have checked that the cd is held in firmly, it's actually quite solid for a magnetic holder.

I do see what you mean about current adjustments, I had a SS laser pointer that began do die after a while, it just got weaker and weaker.

First I'll attempt to clean out the whole optics of the thing, I think I got some bad dust in there cause I was stupid and sanded some wood near my listening room and made a big cloud of dust.

I found that cleaning the outer surface of the lens helped quite a bit, but I'll clean the rest before I make any adjustments.

I have a scope, a few for that matter. I'm quite electronically capable so if you guys know how to use the scope to make adjustments can you tell me? I'd like to make sure its calibration is good anyhow...


Thanks
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Old 29th November 2002, 02:10 PM   #19
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This thread provides some good info on lasers and related mechanisms: Philips CDM-1
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Old 29th November 2002, 03:02 PM   #20
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Well, I couldn't really find the info I need in there. I have to find out how to connect the scope first. I have no idea where to tap on so I can see the proper waves. I don't really know anything about how the waves should look or anything, so I need a bit of explanation if anybody can help with that...
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