Hello everyone,
I hope you’re all doing well! I’m reaching out to this wonderful community because I’m in a bit of a pickle with my beloved Lavry DA11 DAC.
The headphone output has stopped working, and upon inspection, I found several burnt components (transistors, resistors, and capacitors) in the headphone section. Unfortunately, the markings on these components are now completely unreadable.
I’ve tried contacting Lavry support several times for component identification, but haven’t had any luck getting a response. As a former Lavry dealer in France (2007-2010), I really love this DAC and would hate to see it end up in a landfill over something potentially fixable.
What I’m looking for:
• If anyone owns a working Lavry DA11 and wouldn’t mind taking clear photos of the headphone circuit components
• Any repair technician who has worked on these units and might recognize the components
• Someone who might have schematics or component list for this section
I’ve attached photos of my unit showing the damaged parts. Any help in identifying these components would be greatly appreciated!
This community has always been amazingly helpful, and I’m grateful for any assistance you can provide.
Thank you in advance,
I hope you’re all doing well! I’m reaching out to this wonderful community because I’m in a bit of a pickle with my beloved Lavry DA11 DAC.
The headphone output has stopped working, and upon inspection, I found several burnt components (transistors, resistors, and capacitors) in the headphone section. Unfortunately, the markings on these components are now completely unreadable.
I’ve tried contacting Lavry support several times for component identification, but haven’t had any luck getting a response. As a former Lavry dealer in France (2007-2010), I really love this DAC and would hate to see it end up in a landfill over something potentially fixable.
What I’m looking for:
• If anyone owns a working Lavry DA11 and wouldn’t mind taking clear photos of the headphone circuit components
• Any repair technician who has worked on these units and might recognize the components
• Someone who might have schematics or component list for this section
I’ve attached photos of my unit showing the damaged parts. Any help in identifying these components would be greatly appreciated!
This community has always been amazingly helpful, and I’m grateful for any assistance you can provide.
Thank you in advance,
Attachments
The circuit appears to have horizontal symmetry (merge along the yellow axis). This allows for the identification of certain passive component values, as well as those of the two transistors, etc. I have marked in red the relationships between symmetric parts. Also, replace the OP27. This is probably the headphone amp of the DAC.
This may help, but it may not be sufficient if the root cause cannot be identified.
This may help, but it may not be sufficient if the root cause cannot be identified.
Maybe the guys under
https://audiophilestyle.com/forums/topic/10775-lavry-engineering-paper-on-hi-res/#comments
and
https://audiophilestyle.com/forums/topic/2341-nos-non-oversampling-dacs-dan-lavry-comments/
and
https://www.logicuser.de/forum/viewtopic.php?t=71397
can give advice and upload images of a PCB device from the same model.
Also here maybe you got advanced information:
https://www.da-x.de/de/digitale-studiotechnik/wandler/lavry.html
P.S.: If one use another PCB of this model to identify and replace all defective components based on their type designation, there's a high risk that the same thing will happen again - i. e. all the parts will burn away again.
For this reason, it's essential to determine the cause of this process of burning the parts.
And for this, it's essential to have a circuit diagram, a circuit or functional description, and possibly even a service bulletin on the desk, because it's quite possible that this problem existed in an entire batch and that a later upgrade, which would then be absolutely necessary for that particular unit, could prevent this destructive process from occurring again.
I am almost certain that the burnt parts did not burn on their own.
https://audiophilestyle.com/forums/topic/10775-lavry-engineering-paper-on-hi-res/#comments
and
https://audiophilestyle.com/forums/topic/2341-nos-non-oversampling-dacs-dan-lavry-comments/
and
https://www.logicuser.de/forum/viewtopic.php?t=71397
can give advice and upload images of a PCB device from the same model.
Also here maybe you got advanced information:
https://www.da-x.de/de/digitale-studiotechnik/wandler/lavry.html
P.S.: If one use another PCB of this model to identify and replace all defective components based on their type designation, there's a high risk that the same thing will happen again - i. e. all the parts will burn away again.
For this reason, it's essential to determine the cause of this process of burning the parts.
And for this, it's essential to have a circuit diagram, a circuit or functional description, and possibly even a service bulletin on the desk, because it's quite possible that this problem existed in an entire batch and that a later upgrade, which would then be absolutely necessary for that particular unit, could prevent this destructive process from occurring again.
I am almost certain that the burnt parts did not burn on their own.
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Thank you so much for your super helpful response! I really appreciate you taking the time to assist me with this.
It’s been virtually impossible to get support from Lavry as they don’t provide any documentation for repairing their products. I find this frustrating since I’m only looking for basic component values of parts that have burned out - nothing “confidential” about their design secrets.
There’s a bit more to the story that might help understand why I’m so keen to fix this unit. I actually sold this DAC that I used daily (though I rarely used the headphone output myself - maybe once or twice). The buyer returned it because the headphone output wasn’t working, which is completely fair. I didn’t want to cause them any trouble, so I paid for shipping both ways and refunded them in full. Now I’d like to repair it properly before putting it up for sale again.
I suspect the buyer might have had a defective headphone or something that caused the damage, since I barely used that output. So now I need to both identify the burned components AND figure out what caused the issue in the first place to prevent it from happening again.
Your help is a huge step forward for me. Thank you again for being so generous with your knowledge and time - this community is amazing!
Best regards,
It’s been virtually impossible to get support from Lavry as they don’t provide any documentation for repairing their products. I find this frustrating since I’m only looking for basic component values of parts that have burned out - nothing “confidential” about their design secrets.
There’s a bit more to the story that might help understand why I’m so keen to fix this unit. I actually sold this DAC that I used daily (though I rarely used the headphone output myself - maybe once or twice). The buyer returned it because the headphone output wasn’t working, which is completely fair. I didn’t want to cause them any trouble, so I paid for shipping both ways and refunded them in full. Now I’d like to repair it properly before putting it up for sale again.
I suspect the buyer might have had a defective headphone or something that caused the damage, since I barely used that output. So now I need to both identify the burned components AND figure out what caused the issue in the first place to prevent it from happening again.
Your help is a huge step forward for me. Thank you again for being so generous with your knowledge and time - this community is amazing!
Best regards,
some images of DA11;
first image show a power supply modification (maybe the right solution for the problem mentioned in post #1).
Unfortunately a lot of various website proposals I get which haven't to do with this, but the website from the genuine Japanese forum don't goes open by google keyword
"中古LAVRY DA11 D/Aコンバーター 中古ケーブル2種"
first image show a power supply modification (maybe the right solution for the problem mentioned in post #1).
Unfortunately a lot of various website proposals I get which haven't to do with this, but the website from the genuine Japanese forum don't goes open by google keyword
"中古LAVRY DA11 D/Aコンバーター 中古ケーブル2種"
Attachments
Did the issue occur after connecting a new pair of headphones? If not, does the headphone you usually use work properly with another amplifier?
The first question to answer is whether the problem originates from the DAC or the load (the headphones).
The first question to answer is whether the problem originates from the DAC or the load (the headphones).
I don't know. When I sold the DAC, I didn't test the output for headphones. The buyer received the Dac and told me that it didn't work with his headphones. I refund him and I retrieved the DAC. It works very well with the other output line. Maybe his headphones is the root of the problem.
Under
https://www.lavryengineering.com/pdfs/lavry-da11-manual.pdf
unfortunately I don't find any specifications concerning the headphone output stage (min. impedance, short protection or not etc.).
Also not here:
https://www.head-fi.org/threads/lavry-da11-headphone-amp-quality.456195/
https://www.head-fi.org/threads/the-lavry-da11-a-review.435563/
https://www.lavryengineering.com/pdfs/lavry-da11-manual.pdf
unfortunately I don't find any specifications concerning the headphone output stage (min. impedance, short protection or not etc.).
Also not here:
https://www.head-fi.org/threads/lavry-da11-headphone-amp-quality.456195/
https://www.head-fi.org/threads/the-lavry-da11-a-review.435563/
Lavry doesn't want to help me. I tried to ask them the list of the burnt components but they don't want.
Maybe you will get help here (Berlin Germany)
https://www.da-x.de/de
info@da-x.de +49 30 439 73 78 20
P.S.: an off-topic question: I am looking for an address, where voice coil repairs are performed for legendary Focal speakers like the ones under
Focal 5k013l/5k4211 . I heard from a friend that a former Focal employee performs this using the original manufacturing tools.
If you know an exact address, please let me know and post this information under the mentioned URL – thank you very much
https://www.da-x.de/de
info@da-x.de +49 30 439 73 78 20
P.S.: an off-topic question: I am looking for an address, where voice coil repairs are performed for legendary Focal speakers like the ones under
Focal 5k013l/5k4211 . I heard from a friend that a former Focal employee performs this using the original manufacturing tools.
If you know an exact address, please let me know and post this information under the mentioned URL – thank you very much
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Dax can't help me... I don't understand why Lavry doesn't want to share with me the list of 10 burnt components.
If you cannot find any reference information, you can still try to replace the components based on those used on the other channel. For the two power transistors are SOT223 1W versions of the 2N2222 and 2N2907 (P2F marking) . For example, use PZT2222 and PZT2907 for U60 and U59, respectively. For the small SOT23 transistors Q6, Q5, Q9, Q11, Q12, Q13, and Q19, you will need a multimeter to test them (except for Q11 and Q13...). For the damaged ones, replace them with generic NPN or PNP transistors after determining whether they are NPN or PNP and confirming their pinout using their counterpart on the other channel. The PCB layout is identical for both channels; it is not a symmetry but rather a translation.
Counterparts :
Q6 <- Q8
Q5 <- Q7
Q9 <- Q10
Q12 <- Q16
Q13 <- Q15
Q11 <- Q14
Q18 <- Q20
Q19 <- Q21
For generic NPN I'll use (if pinout is teh same) : BC817-25 for NPN and BC807-25 for PNP, or identifiy marking on the good transistor and identify exact part number with the marking.
Also change OpAmp : OP275. for the resistors, value is writen one the good ones, ex: R120 and R119 are 20 Ohms,
I admit that this approach is somewhat random, but if you are completely stuck, it may produce a result.
But before all, you should check supply on pins 8 and 4 of OP275 regarding to ground, one can reasonably expect to have +/- 8 to 15V DC and 0V AC (no ripple), and does one of the two chanel
Counterparts :
Q6 <- Q8
Q5 <- Q7
Q9 <- Q10
Q12 <- Q16
Q13 <- Q15
Q11 <- Q14
Q18 <- Q20
Q19 <- Q21
For generic NPN I'll use (if pinout is teh same) : BC817-25 for NPN and BC807-25 for PNP, or identifiy marking on the good transistor and identify exact part number with the marking.
Also change OpAmp : OP275. for the resistors, value is writen one the good ones, ex: R120 and R119 are 20 Ohms,
I admit that this approach is somewhat random, but if you are completely stuck, it may produce a result.
But before all, you should check supply on pins 8 and 4 of OP275 regarding to ground, one can reasonably expect to have +/- 8 to 15V DC and 0V AC (no ripple), and does one of the two chanel
A translation is a symmetry in an infinite repeating pattern though, such as a wallpaper pattern.
I'll take the DAC to a repairman with your instructions. I don't understand why Lavry won't help me. They refused to give me a list.
Thanks a million.
Thanks a million.
True, but this math, not common understanding of symmetry and translation : repeating a pattern.
Symmetry - literally "measuring the same" or "measures in agreement" - it all depends how you define agreement...
Maybe Lavry spent a lot of time and money developing their products and dont want any information potentially leaked around the world so all their time and money is wasted when someone makes a cheaper knock off.
This is pretty standard ip protection.
Yes but 5 résistances, one transistor and 2 capacitors... For the headphones output Everything was written but components burnt.
It is not around the conversion digital to analog. And it is 15 years old...
And I wanted to buy a D924 but I won't. Because the support is bad.
It is not around the conversion digital to analog. And it is 15 years old...
And I wanted to buy a D924 but I won't. Because the support is bad.
Some companies do not give out any information unless you are a repairer with a registered business.
I have had full service manuals supplied by some companies after i explain who i am and what i am doing.
I have had No response from other companies under the same conditions.
I have experienced some companies that are 'unable' to provide any information what so ever after they were sold and bought by new owners.
I have had full service manuals supplied by some companies after i explain who i am and what i am doing.
I have had No response from other companies under the same conditions.
I have experienced some companies that are 'unable' to provide any information what so ever after they were sold and bought by new owners.