"Trevor Wilson" writes:


**Have you removed the static protection link?

Apart from the packaging I have seen no extra parts on
the new device so unless it is hidden inside somewhere
there is no static protection link. But then I have to
admit that English is not my first language and I might
have guessed wrong at what you mean by static protection
link. My guess is it is something to protect the laser
unit from electrostatic discharge. The only such protection
I have found is warning text on the box and slight blue
tint to the plastic the laser unit was wrapped in.
(Yes I have used wrist band and anti-static mat.)

Recent development: I have revisited the possibility
that adjustment is needed rather than replacement. This
time around I have some luck with this. I can make the
player recognize disks it has rejected lately but in at
least one case it still refuses to play all tracks. I
have no service manual so I am 'driving by the back of
my pants' right now.

/Martin

Martin "Schöön" wrote:
"Trevor Wilson" writes:


**Have you removed the static protection link?

Apart from the packaging I have seen no extra parts on
the new device so unless it is hidden inside somewhere
there is no static protection link. But then I have to
admit that English is not my first language and I might
have guessed wrong at what you mean by static protection
link. My guess is it is something to protect the laser
unit from electrostatic discharge. The only such protection
I have found is warning text on the box and slight blue
tint to the plastic the laser unit was wrapped in.
(Yes I have used wrist band and anti-static mat.)

Recent development: I have revisited the possibility
that adjustment is needed rather than replacement. This
time around I have some luck with this. I can make the
player recognize disks it has rejected lately but in at
least one case it still refuses to play all tracks. I
have no service manual so I am 'driving by the back of
my pants' right now.

**Examine the two circuit boards (new laser and old laser) VERY carefully.
You will probably see a solder blob linking two tracks on the new laser
which is not present on the old laser. The solder blob must be removed for
correct operation.

This may help:

http://www.monacor.de/de/FLE/KSS213C.pdf

--
Trevor Wilson
www.rageaudio.com.au

"Trevor Wilson" writes:

**Examine the two circuit boards (new laser and old laser) VERY carefully.
You will probably see a solder blob linking two tracks on the new laser
which is not present on the old laser. The solder blob must be removed for
correct operation.

This may help:

http://www.monacor.de/de/FLE/KSS213C.pdf

That did indeed help. It would have taken me ages to even think of
such a possibility. The player seems ("seems" because I have not put
it through its paces yet) to work now.

Thanks a ton,

/Martin

Martin "Schöön" wrote:
"Trevor Wilson" writes:

**Examine the two circuit boards (new laser and old laser) VERY
carefully. You will probably see a solder blob linking two tracks on
the new laser which is not present on the old laser. The solder blob
must be removed for correct operation.

This may help:

http://www.monacor.de/de/FLE/KSS213C.pdf

That did indeed help. It would have taken me ages to even think of
such a possibility. The player seems ("seems" because I have not put
it through its paces yet) to work now.

Thanks a ton,

**That would be Tonne (a pitifully insignificant proportion of the planet's
population still clings to the term 'Ton') and, no problems.


--
Trevor Wilson
www.rageaudio.com.au

"Trevor Wilson" writes:

Martin "Schöön" wrote:
"Trevor Wilson" writes:

**Examine the two circuit boards (new laser and old laser) VERY
carefully. You will probably see a solder blob linking two tracks on
the new laser which is not present on the old laser. The solder blob
must be removed for correct operation.

This may help:

http://www.monacor.de/de/FLE/KSS213C.pdf

That did indeed help. It would have taken me ages to even think of
such a possibility. The player seems ("seems" because I have not put
it through its paces yet) to work now.

Thanks a ton,

**That would be Tonne (a pitifully insignificant proportion of the planet's
population still clings to the term 'Ton') and, no problems.


The player played every CD I threw at it yesterday evening so now I
think it really works.

One more question though. Earlier on I tried adjusting the only
potentiometer I could see and if that is the laser intensity adjustment
I may have cranked it up which may be harmful. Any advice on how to
adjust it? I tried, I think, to return the potentiometer to its
original position but I am not sure.

/Martin

Martin "Schöön" wrote:
"Trevor Wilson" writes:

Martin "Schöön" wrote:
"Trevor Wilson" writes:

**Examine the two circuit boards (new laser and old laser) VERY
carefully. You will probably see a solder blob linking two tracks
on the new laser which is not present on the old laser. The solder
blob must be removed for correct operation.

This may help:

http://www.monacor.de/de/FLE/KSS213C.pdf

That did indeed help. It would have taken me ages to even think of
such a possibility. The player seems ("seems" because I have not put
it through its paces yet) to work now.

Thanks a ton,

**That would be Tonne (a pitifully insignificant proportion of the
planet's population still clings to the term 'Ton') and, no problems.


The player played every CD I threw at it yesterday evening so now I
think it really works.

One more question though. Earlier on I tried adjusting the only
potentiometer I could see and if that is the laser intensity
adjustment I may have cranked it up which may be harmful. Any advice
on how to adjust it? I tried, I think, to return the potentiometer to
its original position but I am not sure.

**Unless you have a service manual which includes this adjustment (very rare
nowadays), and/or a laser power meter, you should never attempt to adjust.
So, no advice. Sorry.


--
Trevor Wilson
www.rageaudio.com.au

In article , Trevor Wilson
wrote:
Martin "Schöön" wrote:
"Trevor Wilson" writes:


One more question though. Earlier on I tried adjusting the only
potentiometer I could see and if that is the laser intensity
adjustment I may have cranked it up which may be harmful. Any advice
on how to adjust it? I tried, I think, to return the potentiometer to
its original position but I am not sure.

**Unless you have a service manual which includes this adjustment (very
rare nowadays), and/or a laser power meter, you should never attempt to
adjust. So, no advice. Sorry.

I don't know if this will help with commercial laser diodes, but...

When testing exerimental devices one of the standard tricks is to monitor
the voltage and current as you slowly wind up the applied voltage via a
resistor. The curves often have a knee or jump in them at the point where
coherent lasing starts (this is above the current where they light up). If
you find this you can then set the bias just about the knee, and if the
system works, leave it there. This will give you the minimim needed for
lasing, so if it plays discs OK minimises the dissipation and should
maximise life, etc.

I've used this with other types of diode. But I've never repaired or
experimented with commercial optical drives. So don't know their
characteristics.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Il giorno mercoledì 30 giugno 2010 23:21:10 UTC+2, Martin Schöön ha scritto:
"Trevor Wilson" writes:


**Have you removed the static protection link?

Apart from the packaging I have seen no extra parts on
the new device so unless it is hidden inside somewhere
there is no static protection link. But then I have to
admit that English is not my first language and I might
have guessed wrong at what you mean by static protection
link. My guess is it is something to protect the laser
unit from electrostatic discharge. The only such protection
I have found is warning text on the box and slight blue
tint to the plastic the laser unit was wrapped in.
(Yes I have used wrist band and anti-static mat.)

Recent development: I have revisited the possibility
that adjustment is needed rather than replacement. This
time around I have some luck with this. I can make the
player recognize disks it has rejected lately but in at
least one case it still refuses to play all tracks. I
have no service manual so I am 'driving by the back of
my pants' right now.

/Martin

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