Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Bose laser-more info

So I took apart the case of the Bose so I could clean and lube the
laser assembly. Also used some canned blow off gas to blow any dust
out of the area between the laser and the underside of the lens. After
reassembly the player worked beautifully. The one particular CD played
right off the bat. But after swapping it or another CD, which also
played, and then putting the stubborn CD back in, it refused to play.
I noticed that when blowing out the laser assembly the lens would move
down because of the pressurized gas blowing between the lens and
laser. So I pressed down on the lens and tried the CD again. Worked
great. After stopping the player and re starting the CD wouldn't play.
Pressing down the lens carrier on the left hand side of the lens
carrier and then trying to play the CD works. After stopping and then
starting the CD won't play. But then pressing down the lens carrier on
the left side makes the CD play again. Anybody have any guesses why
this is happening? It looks to me like the lens carrier is just
suspended by 4 spring wires. But maybe there is something else that
might be dragging. Anybody know how the things are really made?
Thanks,
Eric
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Default Bose laser-more info

On Tue, 02 Jan 2018 12:33:04 -0800, wrote:

So I took apart the case of the Bose so I could clean and lube the
laser assembly. Also used some canned blow off gas to blow any dust
out of the area between the laser and the underside of the lens. After
reassembly the player worked beautifully. The one particular CD played
right off the bat. But after swapping it or another CD, which also
played, and then putting the stubborn CD back in, it refused to play.
I noticed that when blowing out the laser assembly the lens would move
down because of the pressurized gas blowing between the lens and
laser. So I pressed down on the lens and tried the CD again. Worked
great. After stopping the player and re starting the CD wouldn't play.
Pressing down the lens carrier on the left hand side of the lens
carrier and then trying to play the CD works. After stopping and then
starting the CD won't play. But then pressing down the lens carrier on
the left side makes the CD play again. Anybody have any guesses why
this is happening? It looks to me like the lens carrier is just
suspended by 4 spring wires. But maybe there is something else that
might be dragging. Anybody know how the things are really made?
Thanks,
Eric


There are two simple solutions:

1. A record player with a good cartridge and needle (stylus).

2. A MP3 player.

If you really are madly in love with CDs, just buy a cheap external CD
player and plug it into the AUX input. My experience with CD players is
this: When they die, they are dead forever..... There is no one on earth
who can fix em'.
(Probably why they are becoming obsolete).

If however it's just that one CD that is causing problems, REPLACE the
CD.


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Default Bose laser-more info

Your obviously very LIMITED experience.
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Default Bose laser-more info

On Tue, 02 Jan 2018 17:23:05 -0600, wrote:

On Tue, 02 Jan 2018 12:33:04 -0800,
wrote:

So I took apart the case of the Bose so I could clean and lube the
laser assembly. Also used some canned blow off gas to blow any dust
out of the area between the laser and the underside of the lens. After
reassembly the player worked beautifully. The one particular CD played
right off the bat. But after swapping it or another CD, which also
played, and then putting the stubborn CD back in, it refused to play.
I noticed that when blowing out the laser assembly the lens would move
down because of the pressurized gas blowing between the lens and
laser. So I pressed down on the lens and tried the CD again. Worked
great. After stopping the player and re starting the CD wouldn't play.
Pressing down the lens carrier on the left hand side of the lens
carrier and then trying to play the CD works. After stopping and then
starting the CD won't play. But then pressing down the lens carrier on
the left side makes the CD play again. Anybody have any guesses why
this is happening? It looks to me like the lens carrier is just
suspended by 4 spring wires. But maybe there is something else that
might be dragging. Anybody know how the things are really made?
Thanks,
Eric


There are two simple solutions:

1. A record player with a good cartridge and needle (stylus).

2. A MP3 player.

If you really are madly in love with CDs, just buy a cheap external CD
player and plug it into the AUX input. My experience with CD players is
this: When they die, they are dead forever..... There is no one on earth
who can fix em'.
(Probably why they are becoming obsolete).

If however it's just that one CD that is causing problems, REPLACE the
CD.

1. You can't play a CD on a record player, no matter how good the
cartdrige and needle are.
2. That should be AN MP3 player, not A MP3 player.

Since this group is aimed at repairing electronics I fail to see how
buying a new CD player will repair the one I have now.

The CD is not the problem, but is a possible diagnostic clue.
Eric


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Default Bose laser-more info

On Wed, 03 Jan 2018 15:34:27 +0000, Baron
wrote:

prodded the keyboard with:

So I took apart the case of the Bose so I could clean and lube the
laser assembly. Also used some canned blow off gas to blow any dust
out of the area between the laser and the underside of the lens.
After reassembly the player worked beautifully. The one particular
CD played right off the bat. But after swapping it or another CD,
which also
played, and then putting the stubborn CD back in, it refused to
play. I noticed that when blowing out the laser assembly the lens
would move down because of the pressurized gas blowing between the
lens and laser. So I pressed down on the lens and tried the CD
again. Worked great. After stopping the player and re starting the
CD wouldn't play. Pressing down the lens carrier on the left hand
side of the lens carrier and then trying to play the CD works. After
stopping and then starting the CD won't play. But then pressing down
the lens carrier on the left side makes the CD play again. Anybody
have any guesses why this is happening? It looks to me like the lens
carrier is just suspended by 4 spring wires. But maybe there is
something else that might be dragging. Anybody know how the things
are really made? Thanks,
Eric


Look for debris between the lens carriage and the magnet on the side
that is sticking, or the suspension is twisted and its rubbing.

I'll check for debris with a magnifier, thanks. Am I correct in
assuming that the lens assembly is only supported by the 4 wires? That
there are no other suspension components that could be getting stuck?
Eric
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Default Bose laser-more info

wrote:

So I took apart the case of the Bose so I could clean and lube the
laser assembly. Also used some canned blow off gas to blow any dust
out of the area between the laser and the underside of the lens. After
reassembly the player worked beautifully. The one particular CD played
right off the bat. But after swapping it or another CD, which also
played, and then putting the stubborn CD back in, it refused to play.
I noticed that when blowing out the laser assembly the lens would move
down because of the pressurized gas blowing between the lens and
laser. So I pressed down on the lens and tried the CD again. Worked
great. After stopping the player and re starting the CD wouldn't play.
Pressing down the lens carrier on the left hand side of the lens
carrier and then trying to play the CD works. After stopping and then
starting the CD won't play. But then pressing down the lens carrier on
the left side makes the CD play again. Anybody have any guesses why
this is happening? It looks to me like the lens carrier is just
suspended by 4 spring wires. But maybe there is something else that
might be dragging. Anybody know how the things are really made?

The lens/laser/sensor assembly is mounted on a veritcal slide and a focusing
servo runs it up and down until it gets the signal from the disc. It sounds
like the slide mechanism is sticking, if of that design. If totally
suspended by springs, and no vertical slide mechanism, there may be dirt, or
maybe the air blast bent the springs a bit. Anyway, it definitely sounds
like the focus mechanism is sticking, so see if you can find out why that is
happening.

Jon
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Default Bose laser-more info

prodded the keyboard with:

On Wed, 03 Jan 2018 15:34:27 +0000, Baron
wrote:

prodded the keyboard with:

So I took apart the case of the Bose so I could clean and lube the
laser assembly. Also used some canned blow off gas to blow any
dust out of the area between the laser and the underside of the
lens. After reassembly the player worked beautifully. The one
particular CD played right off the bat. But after swapping it or
another CD, which also
played, and then putting the stubborn CD back in, it refused to
play. I noticed that when blowing out the laser assembly the lens
would move down because of the pressurized gas blowing between the
lens and laser. So I pressed down on the lens and tried the CD
again. Worked great. After stopping the player and re starting the
CD wouldn't play. Pressing down the lens carrier on the left hand
side of the lens carrier and then trying to play the CD works.
After stopping and then starting the CD won't play. But then
pressing down the lens carrier on the left side makes the CD play
again. Anybody have any guesses why this is happening? It looks to
me like the lens carrier is just suspended by 4 spring wires. But
maybe there is something else that might be dragging. Anybody know
how the things are really made? Thanks,
Eric


Look for debris between the lens carriage and the magnet on the side
that is sticking, or the suspension is twisted and its rubbing.

I'll check for debris with a magnifier, thanks. Am I correct in
assuming that the lens assembly is only supported by the 4 wires?
That
there are no other suspension components that could be getting
stuck? Eric


If you look carefully, you will see that not only does the lens move
up/down, but also from side to side. You can get tiny fractures in
the parts securing the wires. So it is possible that one side twists
slightly and rubs.

--
Best Regards:
Baron.
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