Thanks for your response!
I am actually not using the signals from the servo PCB, there are 4 simple I/V converters on the rear side of the servo PCB (as said, all inspired by your work .. don't want to say I copied all your ideas
).
I am using the servo PDB only for the reference voltage for the I/V amplifier (power by single 5V) and the driver for the focus lens. Here I added a signal (from my USB scope) that I can change in offset (lens position) and amplitude.
I have installed an original pickup (not 'touched' earlier) and have adjusted the 'mirror' (which was a DVD before, but it's now a real mirror glued on the DVD). That is my reference (see 2nd picture).
Now the problem really seems to be to get all signals in the center of the diodes, which is an adjsutment in the µm range. I need to improve the setup.
Anyway, I see that the signals in one direction changes differently than in the other. Not sure if this is now an adjsutment done by the cylinder lens. Need to try, but as said .. everything is so delicate to touch and to adjust.
To be continued
@Salar: good luck on Saturday, used to live in Berlin for almost 11 years.
I am actually not using the signals from the servo PCB, there are 4 simple I/V converters on the rear side of the servo PCB (as said, all inspired by your work .. don't want to say I copied all your ideas
).I am using the servo PDB only for the reference voltage for the I/V amplifier (power by single 5V) and the driver for the focus lens. Here I added a signal (from my USB scope) that I can change in offset (lens position) and amplitude.
I have installed an original pickup (not 'touched' earlier) and have adjusted the 'mirror' (which was a DVD before, but it's now a real mirror glued on the DVD). That is my reference (see 2nd picture).
Now the problem really seems to be to get all signals in the center of the diodes, which is an adjsutment in the µm range. I need to improve the setup.
Anyway, I see that the signals in one direction changes differently than in the other. Not sure if this is now an adjsutment done by the cylinder lens. Need to try, but as said .. everything is so delicate to touch and to adjust.
To be continued
@Salar: good luck on Saturday, used to live in Berlin for almost 11 years.
Attachments
check out post #31 under
https://www.diyaudio.com/forums/dig...-diode-applicable-kss-151a-4.html#post6733000
https://www.diyaudio.com/forums/dig...-diode-applicable-kss-151a-4.html#post6733000
Thanks ASAMS! It was raving success despite the fact that it a 139 minutes long documentary, windy and freezing 15 degrees celsius at the night of the premiere and drunken party people nearby the open air cinema.
But people watched as if spellbound
Sad you don't live here any more because I need to catch up a lot...
I will slowly start to re-read the threads and hopefully
be able to build my own rig because promised me to teach milling
on a modern CNC lathe, starting early September.
So I might be able to built a rig next spring...
Good to hear that it was a success, but apparently the weather was not too coorperative. No real updates on my end, I have been seen some success as well, a drive stayed 'in focus' at some point (no up and down of the lens anymore) but alomost no 'RF' signal. So, a bit of the story I miss - maybe now the cylinder lens adjustment comes into the game. Still believe I am still and that my little setup is suitable, but the project is on hold currently since I have no real time left. Let's see where the summer brings us to (and discussing in a 'biergarten' would have been a very nice option).
Hello, Congratulations!!!!
I was following few persons which want to change the diode succesfully on a kss 272 laser and you are the first one which succeded! Congrats for that!
I have a dead laser how much would you ask me to put a new diode? Actually i have three dead lasers...
thanks ,
Kind regards,
Zanko
Hi. In the KSS-190A thread, there are three people who had been practiced with this method some cd pickups, with different result, with Sony and Technics laser pickup. I don't work in this kind of things, I've done for some kind for chanllenge. I live in Canary Islands, and lately Customs delay are very long. If someone who lives more near than I, can do the work, it is better. But by the moment, you must know that these KSS are repairable, perfect or almost perfect, but repairable, This is the KSS-190A and 151A thread.
https://www.diyaudio.com/community/...diode-applicable-for-the-kss-151a-too.366374/
https://www.diyaudio.com/community/...diode-applicable-for-the-kss-151a-too.366374/
Hello,
As far as I know you are the only person which succeded to repair a Kss 272 a lens with a new diode and that it fonctions good after. i had a contact with a German and Dutch guy which tried but they did not do it and i do not know other persons. That is why i asked you for help, I have three players in my cave because the lenses are almost dead (one is really dead) the others are nearly dead - skipping all the time. It is a pity you do not do it, i am not in a hurry, i can wait but if ever you change your mind and if you want to specialise youself in it - i have three to repair!
, bravo and thank you!Hi. You can send me one, the worst or non running laser pickup. If you like the result, I could repair the two rest. If you want, I pass my address. I live in La Palma, near Tenerife, Canary Islands. Best regardsHello,
As far as I know you are the only person which succeded to repair a Kss 272 a lens with a new diode and that it fonctions good after. i had a contact with a German and Dutch guy which tried but they did not do it and i do not know other persons. That is why i asked you for help, I have three players in my cave because the lenses are almost dead (one is really dead) the others are nearly dead - skipping all the time. It is a pity you do not do it, i am not in a hurry, i can wait but if ever you change your mind and if you want to specialise youself in it - i have three to repair!
Hello, Thank you, i am willing to send you evet the three but as you say - this one do not work - you can check it if you want, I would check the solderings on the contacts and the last time i tried this one - it was not working at all. So I am willing to send one to you, i will mark a very small value so you do not pay anything and i will pay for the shipping. if you can fix them well i can pay you something also for your time too. I am excited to see if these things are repairable.
Please do give me your address so i can send you one rapidly.
Kind regards,
Zanko
Attachments
Hello to all,
Since this thread is about KSS272A and I have 2 Sony unit equipend with this laser pick-up (339ES and 559ES), I need your support and advices regarding one of those 2. I bought the 559ES a month ago as not working (read TOC, but failed to play tracks). After many research, I tried to adjust the pots located on laser unit. First the tracking balance (TB) - no result - back to factory setting/position, than AFC - also no result and back to factory setting/position. Finally, I tried the Focus balance and the results begun to show. The factory position of FB pot was at 12 o'clock and I turned left to 9 o'clock. The unit reads now the cds without problem, but the pickup is a little noisy, some how. As I don't have an osciloscope, please tell me if the settings I made are somehow correct and how much they influence the life of laser diode? Any other advices/recomendations?
Many thanks
Cristian
Since this thread is about KSS272A and I have 2 Sony unit equipend with this laser pick-up (339ES and 559ES), I need your support and advices regarding one of those 2. I bought the 559ES a month ago as not working (read TOC, but failed to play tracks). After many research, I tried to adjust the pots located on laser unit. First the tracking balance (TB) - no result - back to factory setting/position, than AFC - also no result and back to factory setting/position. Finally, I tried the Focus balance and the results begun to show. The factory position of FB pot was at 12 o'clock and I turned left to 9 o'clock. The unit reads now the cds without problem, but the pickup is a little noisy, some how. As I don't have an osciloscope, please tell me if the settings I made are somehow correct and how much they influence the life of laser diode? Any other advices/recomendations?
Many thanks
Cristian
On ebay I have found this special Dutch guy for repair service on SONY laser units from KSS-Series:
https://www.ebay.com/itm/294757258722
https://www.ebay.de/itm/294757258722
At first glance it looks very interesting to me.
Any experiences ?
https://www.ebay.com/itm/294757258722
https://www.ebay.de/itm/294757258722
At first glance it looks very interesting to me.
Any experiences ?
Greetings! You need to start with a complete cleaning of the laser unit, from the outside, from the inside and guides. A very important point is the condition of the lens, look carefully if there are any scratches on it? Even micro-scratches in the center greatly affect the quality and level of the RF signal. Check the backlash of the spindle motor, this is very important, especially at the beginning of the reading, where the rotation speed is maximum. In order to find out the state of the laser unit, it is useful to acquire an LD radiation power meter (this is a necessary device), an oscilloscope and a millivoltmeter, using them in combination. If the output power is normal, the current is normal, and the RF level is weak and blurry, then this is an indicator of a problem with the lens or severe contamination of the laser beam path. This is what the picture on the oscilloscope should look like. This is exactly the case where I replaced the lens, the signal became clear and rose to the normal limits.
Attachments
Thanks for reply. I already cleaned the lens and tha guides. The lens looks ok, no scratches. The player looks clean inside, no dust or smoke. I replaced some capacitors on BD and spindle motor boards, otherwise everything looks ok. The only pot I adjusted is the one responsible with focus balance. After that, the unit plays fine. I don't have the skills to clean o replace what is inside the laser pickup, I'm affraid to damage more... My question is if the adjustment I made influences somehow the power of laser diode, in terms of life span. I will check the RF level in the future.
Btw, during the adjustment, one SMD components (ceramic capacitor) came loose from its place. I tend to believe that it was partially unglued before, which led to the improper functioning. After the piece fell, the laser continued to work as it did after the adjustment. I tried to glue the part back, but nothing changed after that.
For the moment, I'm happy how the player works, but I need to know how the adjustment I made influences the lased diode in the future....
Btw, during the adjustment, one SMD components (ceramic capacitor) came loose from its place. I tend to believe that it was partially unglued before, which led to the improper functioning. After the piece fell, the laser continued to work as it did after the adjustment. I tried to glue the part back, but nothing changed after that.
For the moment, I'm happy how the player works, but I need to know how the adjustment I made influences the lased diode in the future....
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This adjustment will not affect the state of the diode in any way, it affects the stability of the servo system (in simple words). APC adjustment affects, it is undesirable to touch it!
That's what the specifications require. It definitely won't get worse. Well, what can I say? Enjoy, good player, and good luck to you! Best regards, Dmitry!