Denon DCD-S 10 II clock

[JLPAS]

Hi, does someone know the parts to remove on the board to mount a new clock ( the Burson audio one) ? Thanks .

[JLPAS]

No idea someone ? Thanks .

[Extreme_Boky]

Locate (and confirm) that IC104 is Yamaha receiver YM3623B.

Remove C428, C429, R415 and X101 (16.934MHz). Feed the oscillator clock signal in to IC104 pin 6. Connect the oscillator ground to lowest noise section/area of the ground plane around receiver chip you can find. Use external power supply with the lowest amount of noise you can obtain.

Good luck,
Boky

[rfbrw]

Originally posted by Extreme_Boky
Locate (and confirm) that IC104 is Yamaha receiver YM3623B.

Remove C428, C429, R415 and X101 (16.934MHz). Feed the oscillator clock signal in to IC104 pin 6. Connect the oscillator ground to lowest noise section/area of the ground plane around receiver chip you can find. Use external power supply with the lowest amount of noise you can obtain.

Good luck,
Boky

Interesting. Presumably you have tried this mod before. Would you say it yielded much of an improvement ?

[Extreme_Boky]

I would say the improvement was easily noticeable - however the whole clock oscillator upgrade really started to show what it was capable of after I lowered the PS noise and picked the lowest noise ground point on the PCB.

There's another xtal in this player - 15MHz, which requires exactly the same treatment as the above mentioned 16.934 xtal.

[Cobra2]

If I remember...Jocko mentioned that the Yamaha-chip only needed the clock to start/lock, and should thereafter be shut off...

And as a consequence, the clock-quality should not matter much???

I did not search, but I think there is a clock-mute-suggestion somwhere here...

Arne K

[rfbrw]

Originally posted by Extreme_Boky
I would say the improvement was easily noticeable - however the whole clock oscillator upgrade really started to show what it was capable of after I lowered the PS noise and picked the lowest noise ground point on the PCB.

There's another xtal in this player - 15MHz, which requires exactly the same treatment as the above mentioned 16.934 xtal.

Well, I am frankly amazed at the idea that anything attached to pin 6 of the YM3623B can make a difference. Not only does that crystal only work to provide a guide frequency, it only does it when the YM3623B is out of lock, ie. no spdif input. More to the point the YM3623B plays no part during CD replay.

Originally posted by JLPAS

Hi, does someone know the parts to remove on the board to mount a new clock ( the Burson audio one) ? Thanks

First you need to locate the CD processing chip and the digital filter, the CXD2515Q and the SM5845, assuming, that is, the S10 II is similar to the S10.
The oscillator at pin 62 of the CXD2515Q should be replaced with the 384Fs Burson clock. A further improvement would to replace the 384Fs feed from the CXD2515Q to the SM5845 with a direct feed from the Burson clock. To do this and still retain the SPDIF input, disconnect the C16M feed from pin 69 of the CXD2515Q and connect a second feed from the 384Fs clock to pin 14 of the 74HC157. In the S10 the correct 74HC157 is IC110. With the S10 II it would be wise to confirm pin 69 of the CXD2515Q is connected to pin 14 of the 74HC157 before disconnecting the two.

[Extreme_Boky]

Hi rfbrw,

I mentioned the second xtal as equally important (X200) and referred to it as 15MHz (where I should’ve typed 16MHz, hhhmmmm). The actual value is 16.9344MHz. So, you followed the tip-off… good!

I replaced the Yamaha receiver chip xtal on pin 6 probably 3 times so far…. The biggest improvement I have obtained was with DPA DAC… (or something like that…) – I think DAC 7 chipset…In my personal opinion the xtal replacement was worthwhile exercise… maybe the cleaner clock and lower level of induced noise helped here…It would be interesting to see internal block diagram of YM chip.

Boky

[Cobra2]

http://www.diyaudio.com/forums/showt...491#post282491

Arne K

[rfbrw]

Originally posted by Extreme_Boky
Hi rfbrw,

I mentioned the second xtal as equally important (X200) and referred to it as 15MHz (where I should’ve typed 16MHz, hhhmmmm). The actual value is 16.9344MHz. So, you followed the tip-off… good!

It is actually marked as 15MHz in the manual. The YM3623B xtal is 1MHz.

I replaced the Yamaha receiver chip xtal on pin 6 probably 3 times so far…. The biggest improvement I have obtained was with DPA DAC… (or something like that…) – I think DAC 7 chipset…In my personal opinion the xtal replacement was worthwhile exercise… maybe the cleaner clock and lower level of induced noise helped here…It would be interesting to see internal block diagram of YM chip.

Boky

The datasheet tells all.