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 Recommendations for treatment of lasers in CD players

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عدد المساهمات : 542
تاريخ التسجيل : 16/06/2010

مُساهمةموضوع: Recommendations for treatment of lasers in CD players   الجمعة أبريل 22, 2011 4:30 pm

Recommendations for treatment of lasers in CD players
What should I do if the audio
system stopped reading CD-ROMs.

Recommendations for treatment of lasers in the
players CD. This material is based on the experience of service centers
Audio Aiwa.
Recommendations set out herein may be
used and the repair CD players
other manufacturers.
Dirt on the optics of the laser is
the most common reason for termination
normal operation of CD-player: unit
"Stutters", not "recognize" or not
spins the discs.

As the mud gets on
Laser Optics?


Block CD-player in the most
popular series of mini-systems AIWA NSX-***,
located in the upper part of the apparatus,
immediate vicinity of the ventilation
holes. This makes it vulnerable to the laser optics
dust, which is entered, either from the external environment
room air, or internal air
flows.
Really do not "love" lasers smoking around
apparatus - the resin contained in cigarette smoke,
settle on the optics and remove them very difficult. A
inquisitive cockroaches, for some strange reason,
love to climb inside the laser. If a cockroach
large, it can not turn around in -
closely. A "reverse" the cockroach do not
able. Lack of food, slowly roasted
laser beam are doing their work and soon
curious insect dies. A player
refuses to work.
Laser device.
Before you begin to repair
look at the schematic device is a laser. In
models of mini-systems Aiwa NSX, the following
types of lasers, the production of Sony: KSS-210, KSS-212,

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Laser Technical English
is called the pick-up assy.
This is a fairly complex device consisting of
semiconductor laser (2), a special prism
(4), a focusing lens with a mechanism of correction (3)
panel with photodiodes (1).

The laser beam (red arrow),
reflected from the prism passes through
focusing lens and falls on the disk (5).
Reflected from the disc, the beam (green arrow)
returns, passes through a prism and falls on
readers photodiodes.

As you can see, pollution lenses or
prism is doubly worse passing beam, so
as two times are in his way.
How to clean the laser?

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Appearance of the laser (the example of KSS-210)


Clearly visible "eye"
focusing lens. Black surface around
Lens - plastic cap that protects
internal structure of the laser on the external
impacts.
Contamination of the focusing lens is the most frequent and
a simple fault. Dust is best to blow with
Turn the lens. But, of course, do not just blow on the
it - you'll only further contaminate it.
Professionals use special
aerosol cans of compressed purified
air. Balloon costs from 150 to 370 rubles
Depending on the volume. You can buy the
specialty stores. In
St. Petersburg, this shop "Mega-Electronics"Or"AV Center. Enough of this
spray-on cleaning hundreds of other lasers.

[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
From the head of the balloon departs
a thin plastic tube, allowing
direct air to the right place. To clean
laser direct pipe to the lens and
"Blow" on the laser for 1-2 seconds.

The lens surface can be cleaned and
cotton hygienic wand. If the pollution
strong, you can use ethanol
alcohol. Do not press too hard - this will erase
enlightening special layer on the surface
lenses. Yes, and the mechanism of lens suspension is very
delicate touch of it can cause damage.


NOTE: In no case
Use acetone - lens is made of plastic
and you're hopelessly ruin it.


If cleaning the lens surface is not
helped, it is likely that the dust from getting inside the laser
on the prism surface. It is more difficult
pollution, but with him you can handle. But for
This will parse the laser.
Pressing out tucks, remove the protective
cap, and you will see the following:


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Type of laser removal of the cover.


Complex structure around the lens -
A special electromagnetic suspension. She
is part of a system of automatic
focusing the beam. On playback,
electromagnet continuously adjusts
the lens, maintaining a constant
the distance between the lens and the disc. This is necessary
because the rotation disk does
significant fluctuations in the vertical
plane, and no system of automatic
Focusing normal work CD player
would be simply impossible.

The first method of cleaning
prism: Simple.


Move the tube to the gap between
lens and body several times, short
"Turn" blow prism. Long blow
impossible, as the compressed air leaving the
cylinder is cooled and, thus, also
cooled and the prism. In this case, it is possible
moisture from the air at room
temperature on the surface of the prism. After
drying of water droplets, formed divorces
dirt, wash that will be very difficult.
This method allows you to clean the dust had settled on
prism, but with a serious pollution
vsopolzuytes second method.

The second way: trebuschy
accuracy.


Just as in the first method, remove
plastic cover. Beneath it we see two
small cog. Apply a thin risks to
metal frame, through which pass
screws and a metal base on housing
laser. This will allow for reassembly
properly install the lens in place. And it is very
important, otherwise it will be broken optical axis.
Remove the screws and remove the focusing lens.
Perhaps next to the screws would be dealt
droplets of glue - carefully srezhate their acute
scalpel.


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
Kind of laser with the cover lens.

In the mine under the lens and prism stands. Must
gently wipe its surface. There is
little difficulty. Prism, as you remember,
located at an angle of 45 degrees, and the usual
cotton swabs is too thick. S
You can clear only the center of the prism. To remove
dust from the corners of the prism, a more subtle
tool. Aiwa firm delivers a service center
special, tiny sticks.


[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]
The left stick that comes AIWA.
Right - the usual wand.

At home, we can take
match, planing it, and wound on the tip of the bit
wool. The main thing - do not scratch the surface of the prism
and see to it that inside the laser does not
remained wool. A few strokes, wipe
prism. Collect the laser back, just aligning
deposited previously risks.

WARNING: Avoid sudden movements.
The connecting cable between the electromagnets
lens and the laser can stop reckless
movement.

If after the specified
Operations CD-player will not start, then
most likely a laser is not subject to
recovery or failure is
in another.
If you want to get some clarification on the article or to share their own
experience - welcome to the forum.
In conclusion.
One of the possible exit
laser system is overheating rising
flow of warm air from radiators
elements of the amplifier and power supply.


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Recommendations for treatment of lasers in CD players
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