Marantz CD-5003 Mod

[michelino]

Oh, I've forgotten my last post!
The kwak clock is now correctly installed in my marantz cd5003! The clicks were due to a bad connector to the ground.
Roushon, I'm very busy in these days because I'm working to my thesis for the bachelor degree at the university but for sure as soon as I've time, I'll let you know

[Roushon]

Thanks for your response. I will look forward to your posting. In the mean time best wishes to your thesis...I wrote my thesis long back and know how involving it is.

Roushon.

[michelino]

Hi everybody!
As promised, I've ended and exposed my thesis and so we can now talk about our marantz cd5003. Here are my mods. For shure there will be other improvement to do but these make the marantz way way better than the stock one .
Enjoy


MARANTZ CD 5003 MODs

AUDIO PWB:
C612, C712 -> 20uF + 20uF MKP
C602, C702 -> 3300pF XICON 23PS (styrene)
C604, C704 -> 330pF XICON 23PS (styrene)
C605, C705 -> 1000pF XICON 23PS (styrene)
C607, C707 -> 1500pF XICON 23PS (styrene)
C615, C715 -> 1000pF XICON 23PS (styrene)
C608, C708 -> 100pF 1000V WIMA FKP2
C616, C716 -> 100pF 1000V WIMA FKP2
C609, C709 -> 330uF 25V PANASONIC FM
C610, C710 -> 330uF 25V PANASONIC FM
C761 -> 470uF 25V PANASONIC FM
C753, C754,C758 -> 220uF 10V NICHICON FP-CAP
IC61, IC71 -> OPA1612
IC77 -> MINIVREG +5V

Put 0,1uF 50V X7R between the pins + and - of: C609, C610, C709, C710.
Put 0,1uF 50V X7R between ground and the pins VL, VA of DAC CS4392. Keep attention during the soldering of these two caps to avoid short circuit.

Bypass HDAM and muting circuit: remove R623, R723 and connect the node R627/C616 and R727/C716 (HDAM input) to the respective RCA output plug with 40uF (or 20uF + 20uF) MKP capacitor. This mod is a MUST. If during ON/OFF the cd player generates some “bump” sound, you can use two reed relays with 5V coil to put the output to GND and remove these bumps. The relays should be controlled from the input of Q603 and Q703 (to be tested but should work). The diodes D605, D606, D705, D706 provides about 4.5V on the cathode when the audio should be muted. If you do this mod, the swapping "C612, C712 -> 20uF + 20uF MKP" can be omitted because this mod bypasses C612/C712.

For minivreg, schematics are available on the web. Soon I’ll update my PCB design.

HEADPHONE PWB
C801, C802 -> 330uF 25V Panasonic FM
C803, C804, C807, C808 -> 47uF 50V Nichicon Muse KZ
IC81 -> OPA1642/OPA1612

MAIN PWB
C216, C218, C221, C223, C462, C466, C467 -> 330uF 25V Panasonic FM
C326, C327, C341, C401, C405 -> 330uF 25V Panasonic FM
C325, C362 -> 470uF 25V Panasonic FM
C251, C253, C313, C346, C349, C360, C364 -> 220uF 10V Nichicon FP

Clock Mod: remove C260, C261, X251 and connect an external clock on PIN1. Note that the output voltage of the clock must be of 3.3V MAX. 5V clock may damage the clock synthesizer CDCE913. Soon I’ll upload my design of kwak clock modified to obtain 3.3V clock output.

POWER SUPPLY PWB
C913, C917, C919 -> 3900uF 25V Nichicon HE/Panasonic FM
C911, C912, C916, C918, C920 -> 2200uF 16V Panasonic FM
C915 -> 330uF 25V Panasonic FM

I've even swapped the diodes on the power supply pwb with ultra fast UF4003 diodes. I can't remember if there were sound improvement.
Let me know.

Michele

[Roushon]

Congratulation on finishing your thesis! Thanks so much for painstakingly typing the detailed mod. I am taking print of this list and one of these days will open the player. First, I have to source the parts.

I did not understand the clock mod part. How does it help? Also are the schematics of the player available on the net?

Thanks again!
Regards
Roushon.

[Roushon]

I just downloaded the service manual of the cd player.

Thanks!
Roushon.

[Roushon]

Just looking at the schematics and surprised to see the use
of parts like 1N4003 and 78XX series regulators etc. I thought before I have a high-end cd player, now see that even in my LM3886 based amplifier I used better quality parts. Just dying to mod this player.

[Roushon]

Originally Posted by adhiyasa38

cover digital chips with rfi shield.

How does one do this shielding for some particular IC? It will be very good to see some picture.

Thanks and regards
Roushon

[michelino]

clock and regulator schematics attacched. Enjoy!

[michelino]

As requested, here are some photos of my modded marantz.

Marantz CD5003
http://s11.postimg.org/vte62m3oj/IMG_0040.jpg

Clock detail
http://s11.postimg.org/teqvvxctf/IMG_0042.jpg

DAC PCB
http://s11.postimg.org/64hbdzpr7/IMG_0045.jpg

Supply PCB
http://s11.postimg.org/fu4pajmeb/IMG_0050.jpg

Headphone PCB
http://s11.postimg.org/y5zy5fkf7/IMG_0051.jpg

Shielding of IC detail (cut a piece of copper and connect it simply to the closest GND point)
http://s11.postimg.org/uswawgg83/IMG_0052.jpg

Digital PCB
http://s11.postimg.org/cz5usa3hf/IMG_0053.jpg


About the clock mod, the purpose it to have an external circuit to feed all the audio digital IC like the DAC and reduce jitter fluctuations. On this forum or on the web you can find tons of info about such kind of mod.

Hope the pics are useful. Bye!

michele

[Roushon]

Impressive indeed and many many thanks for taking the trouble to post the details and pictures...

Regards
Roushon.