Hello.
As some people and I have said, there is on internet some laser diodes that area announced like Sharp LT022mc that does not do performance like it have to do, and all seems that are a counterfeit. The original has the base plated, and the counterfeit is all golden. The power out of each one is very dissimilar. The power showed in the power meter must be multiplied by 0.73 for 780nm. For example, the best "fake" LT022mc gave 1.64mw(2.25mw x 0.73) for a current of 100mA. That low power with that amount of current shows that the diode is not running like it have to do. This diode was the best "fake", the others was worst, one gave only 87uW for 100mA!
However, one orginal LT022mc gives 4.3mw(6 x 0.73) for 64mA. It's a typical value.
So, avoid these Sharp LT022mc with golden ring socket. They are counterfeits.
There are other diode that are use to be announced like "Sony kss-151A", 3-5mW. Well this diodes are not so bad that fake LT022mc, but they don't feature like it have to do. For to 3mW, the current is betwen 80 or 90mA, this is too high.
Besides, as you can see in the picture, are bigger than original Sony SLD-104 laser diodes, fake diode looks giant compared to original Sony.
The meassures were performed with the Sanwa LP-1.
Fake LT022mc and Sony laser diodes - Google Photos
As some people and I have said, there is on internet some laser diodes that area announced like Sharp LT022mc that does not do performance like it have to do, and all seems that are a counterfeit. The original has the base plated, and the counterfeit is all golden. The power out of each one is very dissimilar. The power showed in the power meter must be multiplied by 0.73 for 780nm. For example, the best "fake" LT022mc gave 1.64mw(2.25mw x 0.73) for a current of 100mA. That low power with that amount of current shows that the diode is not running like it have to do. This diode was the best "fake", the others was worst, one gave only 87uW for 100mA!
However, one orginal LT022mc gives 4.3mw(6 x 0.73) for 64mA. It's a typical value.
So, avoid these Sharp LT022mc with golden ring socket. They are counterfeits.
There are other diode that are use to be announced like "Sony kss-151A", 3-5mW. Well this diodes are not so bad that fake LT022mc, but they don't feature like it have to do. For to 3mW, the current is betwen 80 or 90mA, this is too high.
Besides, as you can see in the picture, are bigger than original Sony SLD-104 laser diodes, fake diode looks giant compared to original Sony.
The meassures were performed with the Sanwa LP-1.
Fake LT022mc and Sony laser diodes - Google Photos
Time to discuss whether the APC of
an old LT022MC player can be modified to drive
modern diodes from Rohm, Arima, QSI.
Not fruitless, folks, as EVERY player from
the first generations had the Sharp LT022-
they were the only privider for at least 2 years.
Oh, and there is also some mechanical stuff:
Adapting pins and case, but adapting rings are still
available, so it is only the pins...
an old LT022MC player can be modified to drive
modern diodes from Rohm, Arima, QSI.
Not fruitless, folks, as EVERY player from
the first generations had the Sharp LT022-
they were the only privider for at least 2 years.
Oh, and there is also some mechanical stuff:
Adapting pins and case, but adapting rings are still
available, so it is only the pins...
Hi! Until the moment, in my experiments, the APC circuit has played well with different diodes. There must be differences between different diodes, but then, the power output can ben adjusted properly.
By the moment, we can get 9mm type N diodes like Mitsubishi ML4402 and Sanyo DL-3030.
9mm type M like Sharp LT022mc is a bit more difficult to find good pieces or equivalents. The fake "golden" LT022mc are a plague, the market is flooded of this crap.
It should be good to find a piece for to adapt a 5,6mm diode in a 9mm socket, and place a typical Rohm diode or other brand in it.
In this site had this kind of adapters, but now is out of stock.
5.6mm to 9mm Laser Diode Case Adaptor – Meredith Instruments
By the moment, we can get 9mm type N diodes like Mitsubishi ML4402 and Sanyo DL-3030.
9mm type M like Sharp LT022mc is a bit more difficult to find good pieces or equivalents. The fake "golden" LT022mc are a plague, the market is flooded of this crap.
It should be good to find a piece for to adapt a 5,6mm diode in a 9mm socket, and place a typical Rohm diode or other brand in it.
In this site had this kind of adapters, but now is out of stock.
5.6mm to 9mm Laser Diode Case Adaptor – Meredith Instruments
I ordered 10 adaptors yesterday. I am still waiting from
for a reply from a diyaudio-member to give me back a player
and BU-1 I donated for his diode swap project that did not progress
in 18 months. Then I would start to try the Rohm diodes you mentioned
in the BU-1. But I misaligned the grating and tube lens by accident before I
sent them to him, so more work to do... Did not havethe time yet to study
the Pioneer alignment procedure but hope to
dig into it in August...
for a reply from a diyaudio-member to give me back a player
and BU-1 I donated for his diode swap project that did not progress
in 18 months. Then I would start to try the Rohm diodes you mentioned
in the BU-1. But I misaligned the grating and tube lens by accident before I
sent them to him, so more work to do... Did not havethe time yet to study
the Pioneer alignment procedure but hope to
dig into it in August...
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I've measured the diodes and here are the data:
1 365uW at 100ma Too low power but too much current
2 1.16mW at 100mA. Poor power but too much current.
3 2.3mW at 100mA. Poor power but too much current
4 124uW at 100mA. Too low power but too much current
5 373uW at 100mA Too low power but too much current
Anyone original LT022Mc, 5,3mW at 66mA. Good.
More pics
Fake LT022mc and Sony laser diodes - Google Photos
1 365uW at 100ma Too low power but too much current
2 1.16mW at 100mA. Poor power but too much current.
3 2.3mW at 100mA. Poor power but too much current
4 124uW at 100mA. Too low power but too much current
5 373uW at 100mA Too low power but too much current
Anyone original LT022Mc, 5,3mW at 66mA. Good.
More pics
Fake LT022mc and Sony laser diodes - Google Photos
In this japanese blog the author shows a LT022mc with the base ring in gold. Maybe in later LT022mc diodes the base ring is in gold. Who knows...
三流情報局
SONY CDP-333ESD ピックアップレーザーダイオードの正体を探る
三流情報局
SONY CDP-333ESD ピックアップレーザーダイオードの正体を探る
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The original diode extracted from the SONY KSS-190A is exactly the same as those purchased from the Chinese, only without the inscription.
I bought 4 pieces. but have not tried to install them yet.
Attachments
Hello!
Do you have an extra Sanyo DL-3030 in stock? Can you sell me 1 piece?
I wanted to buy on iccfl.com, but they already ran out of them.
I would be very grateful if you can sell me 1 piece.
dmk6821@gmail.com my email
According the first attachment the Laser Diode selecting isn't longer necessary on CDM-4 mechanism. Also the other values for adjust laser power on the servo board modification instructions for change from CDM-2 to CDM-4 (attachment No 4-6) supports this statement (variable resistor for APC of CDM-2: 1K, for CDM-4: 4K7).
But according the datasheets of CDM-2 and CDM-4 of the second and third attachment same Sharp type of laser diode was mentioned.
In fact, these statements contradict each other.
Maybe one know, what is right and what is wrong.
Image of CDM-2 laser diode is here:
https://commons.wikimedia.org/wiki/...it_-_laser_and_motor_-_Sharp_LT022MC-0119.jpg
P.S.: for repair support of my Micromega SOLO with CDM-4/25 I am looking for an appropriate Philips model CD-460, CD560 and CD-650 but begin with serial No AH01 - go to
https://www.ebay-kleinanzeigen.de/s...50-ser-no-ah01-nicht-ah00/2120392603-172-4440
All versions with serial No AH00 use a CDM-2 mechanism.
Attachments
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data change philips_cdm2-0500-503 and cdm4.pdf
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datasheet CDM2-0301 + servo 5886 and 6105.pdf
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datasheet CDM4-11 philips_cd472.pdf
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Philips 5886 umbau 6105 CDM2-0301 auf CDM4-11.pdf
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Philips servo 5886 CDM2-0301.pdf
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Philips servo 5886 CDM2-0301-II.pdf
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5886 cd670-servo-recap.jpg -
6105 servo Beogram CD3500.jpg
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