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Sony BU-1 compatibility?
Sony BU-1 compatibility?
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Old 7th July 2017, 11:49 AM   #1
Mike P is offline Mike P  United Kingdom
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Default Sony BU-1 compatibility?

Does anyone here know which versions of the Sony BU-1 laser mechanisms are cross compatible?

I have a Sony 333ESD CD player which needs a replacement laser but I cannot find a replacement BU-1E laser for it. However, I have found a seller in Germany with stock of the very similar BU-1C laser.

This video suggest that BU-1E and BU-1C are cross compatible.

https://www.youtube.com/watch?v=ZLDtRe-EHmc

Any info would be greatly appreciated.
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Old 11th July 2017, 10:56 AM   #2
Mike P is offline Mike P  United Kingdom
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Anyone?
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Old 17th July 2017, 02:00 PM   #3
Salar is offline Salar  Germany
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Hello Mike
I think they are compatible - chipsets are the same.

There could be a difference in cabling between the main board to RF-amp board, but Ill have to check, this will take some days.

I have a BU-1C for sale btw.

All the best,
Salar
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Old 17th July 2017, 03:24 PM   #4
Mike P is offline Mike P  United Kingdom
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Hi Salar,

Thank you for your reply.

If after checking the cabling you think that the BU-1C is compatible I would be interested in buying it from you. Please send me a PM.

Have you made any progress with your efforts to replace the laser diode in high end Sony pick-ups?

Regards, Mike
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Old 17th July 2017, 03:58 PM   #5
Salar is offline Salar  Germany
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Quote:
Have you made any progress with your efforts to replace the laser diode in high end Sony pick-ups?
Unfortunalely not yet. The big obstacle is the diffraction grating.
This is a part in the lens, that has to be turned exactly and slowly for
alignment. It is almost inaccessable after assembly.
Still very much regretting it, one of my working BU-1C´s got misaligned
while trying this. Do not have the time for finding a solution but still some
working BU-1C on the shelf.

This why I am focusing on the CDM-1 swing arm by Philips, to me as
robust and innovative as the BU-1C. They probably share the same laser,
Sharp LT022MC, but the Philips has no diffraction grating to align
But I will not do the same mistake again messing around with a working unit
and I am still waiting for an offer to get a broken CDM-1.
I will check the BU-1C´s I still have, pick one for you and make an offer.
But I need a photo of the connectors between the main board and RF-Amp board of the BU-1C.
You are experienced in swapping laser units, do you have an ESD save working environment and solder station?
If not I can make you the offer to send the player to me to Germany
I have some time after the 24th of July...
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Old 17th July 2017, 05:03 PM   #6
Mike P is offline Mike P  United Kingdom
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Hi Salar,

Please don't give up on replacing the laser diode in the BU-1 laser, it will be such a shame if great machines like the 555ESD, 557ESD, X7ESD and CDP-R1 cannot be fixed in the future simply because of laser diode failures.

I have some experience in replacing lasers. I have changed probably about 5 or 6 laser units without having a problem yet. I have an oscilloscope for doing the laser adjustments on the BU-1.

Do you need any photos of the BU1-E from me?
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Old 17th July 2017, 05:16 PM   #7
Salar is offline Salar  Germany
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I have checked the BU-1´s I have against the "E - Type" (sounds nice an uncle drove one ) from the 333ESD.
My BU-1 are from a CDP 102 and 502. Though the flexible cable´s pin designations seem to be the same (the cable between the RF-Amp Board mounted on the BU-1 and the laser Unit) the boards differ a bit.

Also very intersting:
The Eyepattern´s Peak to Peak voltage is stated as 1V in the CDP-102 and 1.2V in the CDP-333.
Very intersting, I made the same observation with Philips that the Eyepattern´s amplitude was raised in later models.

I assume that changing the laser only but keeping the the RF-amp Board will have no negative effect. But I have never tried this.
Therefor it should be checked if the laser diode is definately faulty as the board will not be changed...
All the best, Salar

Last edited by Salar; 17th July 2017 at 05:19 PM.
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Old 17th July 2017, 05:30 PM   #8
Salar is offline Salar  Germany
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Here are the BU-1 and BU-1E for Reference:
Attached Images
File Type: jpg BU-1.jpg (943.9 KB, 38 views)
File Type: jpg BU-1E.jpg (738.8 KB, 36 views)
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Old 17th July 2017, 05:39 PM   #9
Salar is offline Salar  Germany
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...and their schematics.
Attached Images
File Type: jpg BU-1-CDP102schem.jpg (587.7 KB, 33 views)
File Type: jpg BU-1Eschem.jpg (430.6 KB, 33 views)
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Old 17th July 2017, 05:57 PM   #10
Salar is offline Salar  Germany
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Join Date: Feb 2006
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Quote:
Please don't give up on replacing the laser diode in the BU-1 laser, it will be such a shame if great machines like the 555ESD, 557ESD, X7ESD and CDP-R1 cannot be fixed in the future simply because of laser diode failures.
In the meantime I am rather thinking of building a mechanical adapter that replaces the slider of the BU-1C and holds a "modern" laser.
But I have not researched if any major company still produces classical lasers for CD.
In a visit to IFA fair in Berlin I did not find one supplier for CD-transports.
I am talking about the manufacturer´s section of IFA that must hold at least 200 exhibitors, mainly
from China and South Korea.
One reputated OEM producer, StreamUnlimited from Vienna, Austria, Ex-Philips employees,
working for Music Hall or Ayon (I also assume Musical Fidelity) did not display one transport. This was once their core business.
Looks like the Sony and Sanyo mechs they use are not produced any more.
With replacing the diode on a BU-1C, I need some laser experts:
i.e calculating the astigmatism between diodes.

Last edited by Salar; 17th July 2017 at 06:04 PM.
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