You will have to try it and see, there's no other way. I was just trying to point out potential pitfalls and of course to clarify how the automatic laser power control functions.
As I say I'm not trying to discourage you... I really hope it works and that you can reliably replace the diodes and get not just a pickup that works, but one that would pass all the "playability" tests too.
As I say I'm not trying to discourage you... I really hope it works and that you can reliably replace the diodes and get not just a pickup that works, but one that would pass all the "playability" tests too.
Mooly,
Thank you for clarifying this misunderstanding! So if the laser current is set at the prescribed value, the optical output will be set at optimum, as well (at least for a new laser).
In this case also this thread (post #20) could be of interest:
http://www.diyaudio.com/forums/digital-source/95276-sony-cd-player-optical-pickups-2.html
http://www.diyaudio.com/forums/digital-source/95276-sony-cd-player-optical-pickups-2.html
is this offer still valid? if so, can you please inform how should I proceed? I have a McIntosh MCD7000 with a dead laser, so I would need a laser for CDM-1? Thanks.
Does anyone know if a CDM-0 mechanism can be replaced outright with a CDM-1 assembly ? I have a magnavox FD1000 with a CDM-0 (which still works plenty fine) but didn't know if I could try the CDM-1 in it.
Also, even tho the CDM-0 works just fine, I see no laser light coming from it at all when tested. How ?
Also, even tho the CDM-0 works just fine, I see no laser light coming from it at all when tested. How ?
The light is often hard to see as the wavelength is at the lower edge of what is visible (nearly infra red)... and this is why it's dangerous to stare closely at the lens as the "light" is still there and much "brighter" than you might imagine... it's just that you can't see it.
check out follow website:
Gerner Electronics, Laser pickups, Flexboards, Beamerlampen, Messgeräte
(http_www.lasertrader.de_english)
no "deep link" present, therefore follow instructions for navigation:
1) optical laser pickup
2) hifi up to 1995
This company can do restauration/resurrect service of this old mechanism and can certainly give you the wanted informations.
All CDM0/CDM1 offers are used but checked devices
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Quote:
"Anyway; I managed to get hold of a bunch of brand new laser diodes of the same brand and model, complete with 'bling bling' gold cases. However, I don't have any suitable candidate mechs at the moment, so:"
Where do you get the laser diodes? I tried looking up the sharp part # in a search & came up with nothing. Are there othe lasers that would be acceptable with same values for this?
"Anyway; I managed to get hold of a bunch of brand new laser diodes of the same brand and model, complete with 'bling bling' gold cases. However, I don't have any suitable candidate mechs at the moment, so:"
Where do you get the laser diodes? I tried looking up the sharp part # in a search & came up with nothing. Are there othe lasers that would be acceptable with same values for this?
How this went? Any renewed CDMs? How do you got old laser out from body? I tried one without luck...
Sorry about the lack of reply. For some reason I have not got a single email alerting me to posts on this thread. I am subscribed to it, and I have received notifications about other threads.
I haven't really progressed much with this project, I've had other more interesting DIY Audio projects going on. I did get a dead CDM-0 and a dead CDM-1 to try out, but I haven't been able to mechanically disassemble them.
I did manage to disassemble and replace the diode on a CDM-2, but had no success. No conclusion was made either was there, as that mechanism never worked, and may have had a number of problems other than a worn laser diode.
I currently have at least three good candidates for laser diode replacement. They are all CDM-2s that have worn diodes. They will still read a CD, but their laser current when doing so is over 55mA, so they're not long for this earth.
With the earthquake I do have a lot of free time, so I may get around to trying a replacement on one of them. There's a nice Arcam Delta Black Box 2 DAC that's been hogging my attention, but it's almost finished for now.....
I also was being a bit inflexible before not offering the diodes to anyone who was keen to try replacing them for themselves. Hence anyone can now buy them from me for USD10.00 each. There are ten available, as I want to keep half of what I originally bought. Postage will be about USD7.00 by airmail (no tracking, your risk). Please note that these diodes can't be used to repair CDM-4s for mechanical reasons. In CDM-4s the package containing the diode is partially integrated into the RAFOC.
I haven't really progressed much with this project, I've had other more interesting DIY Audio projects going on. I did get a dead CDM-0 and a dead CDM-1 to try out, but I haven't been able to mechanically disassemble them.
I did manage to disassemble and replace the diode on a CDM-2, but had no success. No conclusion was made either was there, as that mechanism never worked, and may have had a number of problems other than a worn laser diode.
I currently have at least three good candidates for laser diode replacement. They are all CDM-2s that have worn diodes. They will still read a CD, but their laser current when doing so is over 55mA, so they're not long for this earth.
With the earthquake I do have a lot of free time, so I may get around to trying a replacement on one of them. There's a nice Arcam Delta Black Box 2 DAC that's been hogging my attention, but it's almost finished for now.....
I also was being a bit inflexible before not offering the diodes to anyone who was keen to try replacing them for themselves. Hence anyone can now buy them from me for USD10.00 each. There are ten available, as I want to keep half of what I originally bought. Postage will be about USD7.00 by airmail (no tracking, your risk). Please note that these diodes can't be used to repair CDM-4s for mechanical reasons. In CDM-4s the package containing the diode is partially integrated into the RAFOC.
Attachments
Hi,
Would you perhaps consider sending me one over to France, to repair a CDM2 whose laser has perished?
I would of course pay for the shipping cost!
Cheers from fair Burgundy!
Would you perhaps consider sending me one over to France, to repair a CDM2 whose laser has perished?
I would of course pay for the shipping cost!
Cheers from fair Burgundy!
Hi,
I'm a new member and french so please excuse my poor language.
I saw this thread because I would like to restore a faulty CDM-3.
I would like to explain my attempts to resurrect a CDM-3 from a NSM jukebox.
I bought jukebox with defect CD player. No laser output at all during play tentative (I checked with digital cameras and compared with a working CDM-3).
So I try lens cleaning, etc...
In a last option, I remove the Sharp Laser Diode and order some IR 780nm / 5 mW laser diodes from USA and China. Hopefully One model come with same pinout than Sharp Diode (but in a tiny diameter of 5.6mm versus 9 mm of the original Sharp).
I try with new laser diode . . . no laser. No power on LD pin.
I recap the controller board . . . no laser. No power on LD pin.
I check flat ribbons. One track of the Laser ribbon was cut. I sold 3 wires to bypass bad track . . . no laser. No power on LD pin but some power on PD pin.
You can pictures of my attempt on a french forum : www.flipjuke.fr French forum
I begin to suspect a glitch in controller card but I have no information about it.
If you have some idea to identify problem . . .
Thank a lot,
Simon
I'm a new member and french so please excuse my poor language.
I saw this thread because I would like to restore a faulty CDM-3.
I would like to explain my attempts to resurrect a CDM-3 from a NSM jukebox.
I bought jukebox with defect CD player. No laser output at all during play tentative (I checked with digital cameras and compared with a working CDM-3).
So I try lens cleaning, etc...
In a last option, I remove the Sharp Laser Diode and order some IR 780nm / 5 mW laser diodes from USA and China. Hopefully One model come with same pinout than Sharp Diode (but in a tiny diameter of 5.6mm versus 9 mm of the original Sharp).
I try with new laser diode . . . no laser. No power on LD pin.
I recap the controller board . . . no laser. No power on LD pin.
I check flat ribbons. One track of the Laser ribbon was cut. I sold 3 wires to bypass bad track . . . no laser. No power on LD pin but some power on PD pin.
You can pictures of my attempt on a french forum : www.flipjuke.fr French forum
I begin to suspect a glitch in controller card but I have no information about it.
If you have some idea to identify problem . . .
Thank a lot,
Simon
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I am resurrecting this thread. I am looking for a dead CDM-1 as well.
Dead means: Laserdiode is definately dead. Without looking straight into the lens one will notice a red dot when the Player checks if a CD is present.
Goal ist the same: Trying to swap the diode. With 3-beam lasers almost impossible because a diffraction grating has to be aligned. With CDM-1 maybe more possible. because it is one beam
Also, the original Diode (Sharp LT022MC - also to be found in early Sony Players) seems to be thight fitted in the housing.
So maybe distance and angle (in a clock-like manner) may be the imortant valuesm, whereas with Sony Players, horizontal alignment may play a role as well.
I have two CDM-1 Player (CD-304/104) but do not want to sacrifice them, because laser is still working.
BTW:
On one Player, swing arm is dead. Laser works,
focus works, CD spins, but arm does not move at all, even when power is turned on. Arm is not jammed, it can be moved freely.
Any advice on this is welcome as well, Voltages on the power supply board seem to be o.k. Ground contacts seem to be o.k.
Back to topic:
Like those images indicate
installment seems to be easy.
But big problem:
In the very moment, it is absolutely unclear how to pull the original Diode from it´s housing, 2nd from right.
The guy wo send them to me did force the diode out by pushing from top with a thin shaft, therefor removing the prism first and cracking the diode´s glass.
If anyone tried to remove the diode as well, his experience on this appreciated.
Just to mention the drive from which the parts were taken has been long scavenged for other players.
Again, a non working CDM-1 with dead diode is searched to play around with...
Dead means: Laserdiode is definately dead. Without looking straight into the lens one will notice a red dot when the Player checks if a CD is present.
Goal ist the same: Trying to swap the diode. With 3-beam lasers almost impossible because a diffraction grating has to be aligned. With CDM-1 maybe more possible. because it is one beam
Also, the original Diode (Sharp LT022MC - also to be found in early Sony Players) seems to be thight fitted in the housing.
So maybe distance and angle (in a clock-like manner) may be the imortant valuesm, whereas with Sony Players, horizontal alignment may play a role as well.
I have two CDM-1 Player (CD-304/104) but do not want to sacrifice them, because laser is still working.
BTW:
On one Player, swing arm is dead. Laser works,
focus works, CD spins, but arm does not move at all, even when power is turned on. Arm is not jammed, it can be moved freely.
Any advice on this is welcome as well, Voltages on the power supply board seem to be o.k. Ground contacts seem to be o.k.
Back to topic:
Like those images indicate
installment seems to be easy.
But big problem:
In the very moment, it is absolutely unclear how to pull the original Diode from it´s housing, 2nd from right.
The guy wo send them to me did force the diode out by pushing from top with a thin shaft, therefor removing the prism first and cracking the diode´s glass.
If anyone tried to remove the diode as well, his experience on this appreciated.
Just to mention the drive from which the parts were taken has been long scavenged for other players.
Again, a non working CDM-1 with dead diode is searched to play around with...
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Interesting. In my CDM-2 SM version I find only the schematics for the on page 6-1 mentioned servo boards 5725, 5768, 5826 and 5827 (all without adjustment potentiometer for focus offset)
But I am looking for the later versions "5886" and "6105" used in versions from last series of Philips CD670, CD660 and CD650 together with CDM-2/10, CDM-2/29, CDM-4/25 and CDM-4/11 - maybe you can upload this or sending a link for download of the associated supplements - thank you very much.
Please check out second image from post #1102 under
https://www.diyaudio.com/community/threads/philips-cd650-mods.133780/page-56
and post #36 under
https://www.diyaudio.com/community/...2-cdm-4-transports.372412/page-2#post-7030898
check out post #8 under
https://www.diyaudio.com/community/threads/laser-pickup-failure-modes.10506/#post-7135572
concerning questions for sources of noise (bad SNR of eye pattern resp. HF/RF signal).
https://www.diyaudio.com/community/threads/laser-pickup-failure-modes.10506/#post-7135572
concerning questions for sources of noise (bad SNR of eye pattern resp. HF/RF signal).