Hello all! 🙂
I recently found a Vestax CDX12 DJ mixer cd and i was thinking to transform it to a more "audiophile" project...
The CDX12 has 2 cd players of Philips CDM12.3BL (photo)
Probably it's a cheap mechanism usually used to mobile players..
Under the mechanism seats the main pcb with all the necessary.. (photo)
It got the DAC of Burr Brown PCM1710U.
Can't find the service manual or schematic of the player anyway but i was thinking to transform it to a single cd player with tube output after the dac and if i can to get also i BNC digital output also..
Any ideas? I'm not sure if it's worth but it could be a nice try for me..
Thanks a lot!
I recently found a Vestax CDX12 DJ mixer cd and i was thinking to transform it to a more "audiophile" project...
The CDX12 has 2 cd players of Philips CDM12.3BL (photo)
Probably it's a cheap mechanism usually used to mobile players..
Under the mechanism seats the main pcb with all the necessary.. (photo)
It got the DAC of Burr Brown PCM1710U.
Can't find the service manual or schematic of the player anyway but i was thinking to transform it to a single cd player with tube output after the dac and if i can to get also i BNC digital output also..
Any ideas? I'm not sure if it's worth but it could be a nice try for me..
Thanks a lot!
Attachments
Last edited:
Hello again! 🙂
So modding has started..
I found in my stuff two nice Starget 4,7uf/35V caps and i replace the stock with them.
As you can see at the PDF of the PCM1710U, after the L + R audio output.. (pins 14,16)
There is a JRC4558 Dual Operational Amplifier and i think i will replace him too with NE5532.. Any other suggestions there for the OP Amp ??
Also need some help with the input voltage caps after the 5 Volt plug.. Any thoughts for upgrade there?
And last thing about bypass caps near the PCM (7,8,9,10,11,12 and 17,18,19,20,21,21 pins)..
I'm thinking to put in parallel a 0.1uf MKT (Wima) as the PDF suggest...
Thanks a lot!!
So modding has started..
I found in my stuff two nice Starget 4,7uf/35V caps and i replace the stock with them.
As you can see at the PDF of the PCM1710U, after the L + R audio output.. (pins 14,16)
There is a JRC4558 Dual Operational Amplifier and i think i will replace him too with NE5532.. Any other suggestions there for the OP Amp ??
Also need some help with the input voltage caps after the 5 Volt plug.. Any thoughts for upgrade there?
And last thing about bypass caps near the PCM (7,8,9,10,11,12 and 17,18,19,20,21,21 pins)..
I'm thinking to put in parallel a 0.1uf MKT (Wima) as the PDF suggest...
Thanks a lot!!
Attachments
Hello all!
Have done some more things here..
Changed the SMD caps of PCM1710U and output stage opamp with Nichicon FG & Elna Cerafine..
Also replaced the JRC4558 with Ne5532
Any suggestion for the separate Digital and analog supplies ??
Also done some homework with Sprint Layout for the regulated power supply (LM317) for an external clock for the DAC..
Have done some more things here..
Changed the SMD caps of PCM1710U and output stage opamp with Nichicon FG & Elna Cerafine..
Also replaced the JRC4558 with Ne5532
Any suggestion for the separate Digital and analog supplies ??
Also done some homework with Sprint Layout for the regulated power supply (LM317) for an external clock for the DAC..
Attachments
Last edited:
Hello again!
Well things are a bit difficult here! Although I made a power supply to try the cd I didn't find the cdm12. 3bl and I got the 12.3blc...
The laser mechanism don't start the spindle motor..
I try to find any soldering tab that I have to remove but there isn't any.. Probably the electrostatic shield is only the matel clip that I removed from the ribbon tape at first..
Quick question for noobs.
If I get an other mechanism like spf 101n the servo board will communicate?
Thanks a lot!
Well things are a bit difficult here! Although I made a power supply to try the cd I didn't find the cdm12. 3bl and I got the 12.3blc...
The laser mechanism don't start the spindle motor..
I try to find any soldering tab that I have to remove but there isn't any.. Probably the electrostatic shield is only the matel clip that I removed from the ribbon tape at first..
Quick question for noobs.
If I get an other mechanism like spf 101n the servo board will communicate?
Thanks a lot!
Hi everyone!
Any suggestion about?
I couldn't find why the cmd12.3BLC doesn't work..
Is there any possibility to use other complete mechanism by your experience??
The servo pcb look familiar to anyone so we can see what combination is possible?
Thanks a lot!! 🙂
Any suggestion about?
I couldn't find why the cmd12.3BLC doesn't work..
Is there any possibility to use other complete mechanism by your experience??
The servo pcb look familiar to anyone so we can see what combination is possible?
Thanks a lot!! 🙂
Hi there,
I've got the same issue, the unit do not recognise the CD hence it won't spin after closing the cover. The lens works though, it made 3 attempts to read the CD then gives up. Both Philips laser mechanism units were replaced, no change. If I'm not mistaken, your unit was working fine until, after some mods, it stopped working. Have you identify along the sequence of mods where/when the servos refuse to start? I presume the schematics remain elusive.
In my case I just want to unit to play, I'm not really concern about about the sound quality for I have other means for that. It is a beautifully crafted device.
Thanks in advance for your support!
I've got the same issue, the unit do not recognise the CD hence it won't spin after closing the cover. The lens works though, it made 3 attempts to read the CD then gives up. Both Philips laser mechanism units were replaced, no change. If I'm not mistaken, your unit was working fine until, after some mods, it stopped working. Have you identify along the sequence of mods where/when the servos refuse to start? I presume the schematics remain elusive.
In my case I just want to unit to play, I'm not really concern about about the sound quality for I have other means for that. It is a beautifully crafted device.
Thanks in advance for your support!