Philip CD104 CD player, changing belt and removing Oversampling
Ғылым және технология
In this video I detail how I change the drawer opening belt. These old players can have issues with the drawer no closing properly. I remove the CDM1 drive assembly and replace the belt.
11:28 Oversampling removal and clocking mod.
Oversampling was introduced in the early days by Philips, to achieve 16 bit performance with 14 bit converters.
These older 14 bit players have a lower clock speed of 4.2336 Mhz, so a 74 IC can be used to derive a different clock speed.
'The marketeers sold the BS that the 16bit Sony players were superior to the 14bit Philips/Marantz/
Mission players.'
The mod bypasses the 4x oversampling
This involves desoldering the filter IC SAA7030, fitting a socket and a new mini PCB
then adding a resistor and isolating an IC leg. I hope to offer this IC as a circuit in the future.
This makes it a true 14 bit player. Personally will thins make this CD player sparkle, who knows. Many just leave well alone. I did it as it's an easy mod to reverse. So I will compare the results with my other, non modded CD104.
Other issues resolved are the griplets, little through circuit board links. These need resoldered. Electrolytic capacitors are usually FUBAR and need replaced.
Bodgetastic!
Пікірлер: 16
As an Update, I decided to reverse the oversampling mod. This was after speaking to those with much more experience with these machines. The mod can introduce unwanted Rf signals into the audio stream due to the removal of the filter.
@cskabos
6 ай бұрын
NOS mod does not cause any problems...... I use all my cd players and dac that way for more then 10 years..... may be can cause problem with some poorly build amps.... for me never had any....
@puciohenzap891
5 ай бұрын
@@cskabosBut did you measure? It's not a matter of 'I don't hear it so it is not there'.
@cskabos
5 ай бұрын
@@puciohenzap891 you can still use a bessel filter at 40Khz… when using NOS….
Thank you very much for your video. I have a Magnavox FD2040 CD player which has exact transport CDM-1, I have a hard time to put motor assembly back after replace the belt, your video is great help.
@waheex
6 ай бұрын
thanks for watching and i'm glad it helped you
@bwa6654
6 ай бұрын
It is working great now. The original belt is 40 years old. I used 2 mm square belt 128mm length,(64mm when fold in half and measured with caliber). 2mm is beefier than original belt. I love this old CD player's sound-rich and smooth like tube.@@waheex
The piece of plastic at 11.07 looks to me like one of the two little triangles that are underneath the sliding tray.
Good Video , by the way where can I get the plastic wheel in yellow color that one , mine one is broken ! Thanks
@waheex
Ай бұрын
ohh might be tricky, there's a chap called 'merlinboat' on ebay has a lot of spare for this machine
Good video...what size of screwdrivers are required for removing the drive?...can only find T sizes not H
@waheex
4 ай бұрын
ohh I can't remember but it was a torx driver bit I got in a kit. Perhaps some other viewers can comment
What do you mean by pseudo-16bit? Are they not actually 16bit?
@waheex
8 ай бұрын
it's a 14 bit player
@KarlHamilton
8 ай бұрын
@@waheex ah ok, cheers!
@waheex
8 ай бұрын
16 bit came out shortly afterwards and Philips installed a chip to 'oversample' and make it like 16 bit I believe. Many say it compromises the sound of the player, therefore many removed it and bypass with a mod. Also change the clock speed of the player.@@KarlHamilton