Marantz CD56 schematic needed

[tvicol]

Hello,

Can anybody help me to get service manual or schematic for Marantz CD56 ?

I plan to make some heavy modifications on this.

Any info is much appreciated.

Thanks,
tibi

[tvicol]

So, I hypertuned this player.
Result is an audio beast.
Now I can say that I have a player that really makes music flow, with excellent dynamics, resolution, detail, no harsh ... bla bla bla
I started to modify this player one year ago and after each modification the player was extensively listen by me and a group of audiophile friends.

I didn't manage to get a schematic, but I'll try to share with you modifications I made so far.
Here is a list with my modifications (the moust important ones):
SERVO
=====
- LM324 - motor turntable circuit driver was replaced with OPA404 and decoupled with 2 x 100uF Oscon
- turntable motor control JRC4560 was replaced with AD826 and decoupled with 2 x 270uF Oscon
- 33uF capacitor - part of laser cc - was replaced with 47uF Oscon. This is between TDA5708 pin 17 and ground
- TDA5708 and TDA5709 decoupled with 100uF Oscon
- smd capacitor 470pF HFin TDA5708 pin 3 was replaced with polystyrene 470pF
- smd capacitor 5,6nF LPF TDA5708 pin 14 was replaced with polystyrene 5,6nF
- L272MB replaced with L2722 - radial and focus drive
- there are also few 1mH inductors placed in key posistions (supply rails), but I need schematic in order to give you exact position

DECODER & DAC
============
- non oversampling modifications as described on this forum
- Elso Kwak V7 clock - Thanks Elso for sharing !!!
- SAA7210 decoupled with 100uF Oscon and a small heatsink
- SAA7220 decoupled with ferite bead and 270uF Oscon + 2,2nF polystyrene + small heatsink
- SAA7210 HFi pin 25 - capacitor replaced with 1uF polypropylene
- SAA7210 FB pin 24 - capacitor replaced with 2,2uF polypropylene
- TDA1541 changed with TDA1541A and decoupled with 1mH + 270uF Oscon
- TDA1541A pin 16-17 added capacitor 470pF silver mica
- very important TDA1541A need a small heatsink
- TDA1541A cc decoupling with 14 x 220nF polyestere

OUTPUT
======
- LPF removed, de-emphasis as well
- LM833 changed with AD826ARZ - these are SMD and need very small hetsink
- AD826ARZ decoupled with 470nH inductors and 270uF Oscon
- output capacitors changed to 2 x 270uF Oscon bypassed with 2 x 100nF polypropylene
- mute circuit removed

SUPPLY
======
- +/-15V (7815/7915) moved to main heatsink
- all 1N400x rectifiers changed to BYV27 and BYV32
- all electrolitics replaced with Sanyo 105°C and Oscons after regulators.

Regards, tibi

[tvicol]

Great improvment !

Now SAA7210 feed directly I2S signals to TDA1541A. No more SAA7220 which was completely removed.
The clock is going directly to SAA7210 pin 19 and an extra gate was added across pins 18 and 19.

Now separation between instruments is gorgeous.


tibi