From: mark_zacharias@labolgcbs.net
"David Platt" wrote in message
news:pn4d3b-ot.ln1@coop.radagast.org...
> In article <1a75f451-11ea-456d-afeb-a7685602c8ac@googlegroups.com>,
> wrote:
>
>>In both circumstances, will occasionally just stop playing disc
>>entirely, sometimes midway through a song.
>>
>>Steps I've taken so far:
>>
>>1. Made sure any CD I put in there is mint clean.
>>
>>2. Used a brush-style CD player lens cleaner disc according to lens
>>cleaner instructions.
>>
>>Both steps have reduced behaviors in A & B, but not elminated them.
>>
>>What else can I do to eliminate these problems, even under hood?
>>
>>Also: Are these symptoms of read-head laser alignment, or of logic
>>control?
>
> These could be symptoms of a read-head "wear-out". The laser diodes
> do suffer with age - the laser output decreases, and the reflected
> signal seen by the photodiode has a lower and lower signal level.
> This causes both an increase in the error rate of the signal, and
> problems in tracking (the track-following servo doesn't have enough
> signal to work correctly).
>
> A *very* short-term fix which sometimes helps (or at least can help
> diagnose that this is the problem) is to tweak a trimpot in the laser
> circuit which boosts its output. It's short-term because the
> increased current though the laser accelerates its aging... you're on
> a "slippery slope" to laser failure. The only long-term fix is to
> replace the laser (which is commonly part of a larger optical assembly
> that must be replaced as a unit) and then realign.
>
> These could be symptoms of dust or dirt or tar in the optical path
> (e.g. lens) which your "cleaning disc" hasn't removed... these discs
> often don't work very well, and (depending on how the brush works) can
> knock the lens out of alignment and make matters worse. A careful
> manual cleaning of the lens (and, in some players, of a small mirror
> located between the lens and the laser/photodiode) with a soft-bristle
> brush sometimes does better. Some people report good results using a
> very small amount of a liquid cleaner (either electronics-grade
> isopropyl alcohol, or the sort of liquid cleaner used for
> polycarbonate eyeglass lenses) - moisten a brush, wipe the lens
> gently, then wipe equally gently with soft lint-free eyeclass-lens
> cleaning tissue.
>
> If you or anyone else smokes around your CD player, it's likely that
> some tobacco-smoke "tar" has built up on the lens (and/or mirror if
> one is present). This stuff is very difficult to remove, and if the
> lens is impaired by it you may have no choice other than to replace
> the whole optical assembly.
>
> These could also be symptoms of tracking problems due to gunked-up
> "rails". CD players have two different mechanisms for tracking the
> groove - the lens itself is moved (within the optical sled) to track
> small positional changes, and the whole sled is moved on linear or
> semicircular "rails" to make larger adjustments. If dust builds up on
> the rails, or if the lubrication dries out or turns gummy, the sled
> won't move smoothly and the CD player can lose its ability to track
> the disc. This can often be remedied by cleaning the rails (wiping
> them with a Q-tip moistened in electronics-grade isopropanol) and then
> relubricating with a small amount of the right lubricant. Sewing-
> machine oil, watchmaker's oil, instrumentation oil are all good
> choices - they're light, low-viscosity, non-drying oils which have no
> solvents. Tri-Flo is a Teflon-bearing oil which also can work well.
> Don't use WD-40 or Liquid Wrench.
>
>
Pickup flat wire.
part number 1-575-001-11.
Common problem with models using the the KSS-240 pickup.
Mark Z.
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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