Schematic for Rotel RCD-1072

[RnR]

Might anyone have a schematic/parts list for this player?

Thank you!!

 

[Malefoda]

Up for that.

 

[Thomo]

I have Rotel RCD-1070 Service Manual.

I don't know if they're similar or not, but I shall upload it to my site now anyway as it may be useful.

I'll post a link in a couple of minutes.

Cheers, Lee.

 

[Thomo]

Here you go:

http://www.diyhi-fi.co.uk/pdf/Service Manuals/Rotel/

Hope it helps.

Lee.

edit: Matthieu, did you realise you've resurrected a three year old thread? I only just saw it, LOL.

 

[Malefoda]

That's cool, we're planing to mod one soon, very basics things like opamps, key caps and output caps.

According to this they may be very similar... average DAC only seducing for its HDCD ability.

Thanks Lee !

 

[Thomo]

Hi Matthieu.

What dac is in your player?

I find that the dac chip itself is much less important to the sound quality, than how it's used, and most of all what output stage is used.

Cheers, Lee.

 

[Malefoda]

PCM1732
There is only 2 op amps after like in the CD63, and as my friend is a bit scared on this I think simple & superbe LME49720HAs and Rubycon ZA/ZL around can do wonders.
I apologize for the fast statement of average quality DAC, like the Onkyo I had and like a Sansui with Mash I helped to mod these can sound very good with few, even if they are not the best...

Datasheet:
http://www.datasheetcatalog.com/datasheets_pdf/P/C/M/1/PCM1732.shtml

 

[Malefoda]

I have the service manual =)
MP if someone want it.

The BB DAC uses dc blocking caps before the opamps and after!
I may use good ones between DAC and opamps and nothing after LM4562 wich does not do much DC as far as I've tested on my players until now.
The question is what value there, manual talk of 50V/4.7µF lytic cap (no mention of the brand/model) so I was considering some 4.7µF Icel caps (size) or Obliggato MKPs... don't know If lower capacity is posible We can save room & money!
Maybe a clock ready to fit but I don't know where to find one. I'm a bit tired of making Fleas on test boards. There are Tentlabs' XOs on eBay at DIY Hifi but I don't know if these are copies or real stuff from Guido.

Any idea welcome

Matthieu

 

[ekidnah09]

Schematic for RCD-1072

Hello Matthieu,
I am new to the forum and cannot email you direct. Would you be able to supply the Service manual for the RCD-1072? I have a RCC-1055 which is the 5 disc cd player. It uses the same DAC, but uses OP275 op amps also has 4.7uF/25 volt coupling caps between DAC and opamps and then 100uf/25 volt caps between op amps and the rca outputs. The capacitors used are a brand I have never heard of (Su Con?). They are 85 c rated. I am going to replace all electrolytics with Rubicon low ESR. I am thinking of using Metalised polyester to replace the 4.7uF coupling caps but do not know about the 100uF maybe Panasonic Bipolar or FC. I am after the RCD-1072 manual to see the componets they used in the upmaket model. By the way I have replaced the power diodes with high speed low noise ones, this reduced the power supply noise a lot.

Any help very welcome
Regards
Giovanni

 

[Malefoda]

Hi Giovanni,
unfortunately I can't mail you either, you may wait a while or give me your mail in clear.
Do change for MKPs, maybe you can take a nice Obbligato from eBay, same value.

Matthieu

 

[Pars]

Rotel will normally supply the service manual in .pdf format for free, at least the US Rotel does. Email them. I woud also recommend looking at discrete output stages (no feedback) rather than messing with opamp changes. DC coupled if possible.

 

[ekidnah09]

Rotel rcd-1072 schematic

Hi Matthieu,
My email address is gvaticano@gmail.com if you would like to pass on the manual. I have been looking at the coupling Caps MKP for the 4.7uF is no problem BC metalised Polyester. For the 100uF I am thinking of using 220uF Rubicon ZL (low esr) 2 caps in series with negative terminals togeather. This would be like a 110uF bi polar electrolytic a cheap alternative and easy for me to get in Australia.

I am also wondering if this cap (100uF) needs to be this big, what would happen if the size was reduced? I know I would lose some low freqencies but doing the calculations this cap has a 3db roll off at .08 HZ?

The 4.7uf using the input impedance of the lm4562 as 30Kohm has a roll off 3db point at 1.1 hertz but I have read that this needs to be 10 times lower than the lowest frequency you want so 12Hz is the lowest freq the combination will pass with ease.

The article to read about this is at www.ecp.cc/cap-notes.html it is called some notes on coupling capacitors.

It may help if you are thinking of reducing it's value.

By the way does the RCD-1072 have the lm4562 op amps as standard?

I will let you know how I go. good luck with your mods.
Regards
Giovanni

 

[ekidnah09]

Hello Pars,
I am not sure I have the technical ability to create a discrete output stage with dc coupling. Would you be able to suggest some reading on the topic or are there pre designed or pre built modules. It is a good idea and I know some hi end gear uses this method.
Regards
Wombat