| Smiffy |
Hi All
Does anyone have a copy of the schematic of the audio section of the Sony DVPS 7700 dvd player?
Many thanks for any help.
Smiffy. |
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| Wanderer |
| I am expecting service manual for this player any day now. Let me know what exactly you need. |
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| finneybear |
Hi Wanderer
Do you happen to have S7000's service manual, too?
Did you directly oder the manual from Sony?
Thanks.
-finney |
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| Smiffy |
Hi Wanderer
Just need a scan of the schematic for the audio board(which I think is marked AU218)and if poss confirmation that the master clock is 45.1584MHz.Any help would be greatly appreciated
Smiffy |
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| Wanderer |
| quote: | Originally posted by finneybear
Hi Wanderer
Do you happen to have S7000's service manual, too?
Did you directly oder the manual from Sony?
Thanks.
-finney |
No, unfortunately I have only 7700.
| quote: | Originally posted by Smiffy
Hi Wanderer
Just need a scan of the schematic for the audio board(which I think is marked AU218)and if poss confirmation that the master clock is 45.1584MHz.Any help would be greatly appreciated
Smiffy |
Got the manual yesterday. There are 3 parts to AU-218 schematics - 2 audio diagrams and video buffer diagram. Do you want all three? Also, which is more convenient for you - scanned or faxed? |
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| Smiffy |
Hi Wanderer
Just the 2 Audio bits would be fine and if poss the Audio power supply.
Scan would be best if thats ok with you.Thanks you so much for the help.I would like to tweak it up a bit so that its as good as my tweaked 7000 with a bit of luck.
Ta
Smiffy |
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| Wanderer |
| quote: | Originally posted by Smiffy
...Just the 2 Audio bits would be fine and if poss the Audio power supply... |
I can scan tonight and e-mail to you. Just let me know where to. |
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| Smiffy |
aentity@btinternet.com
Wanderer,
Many thanks,will let you know when they arrive.Could you also check the schematic and see if the master clock is 45.1584MHz
Smiffy |
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| Wanderer |
Smiffy,
I got your address, you can remove it now.
Will fax everything tonight (GMT-5), will verify frequency also. |
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| finneybear |
Hi Smiffy
Would you mind sharing your tweak of s7000 with us? Have you done anything to the digi out circuit?
Warderer, thank you for the reply. Looks like I will have to order the service manual myself this time. :)
-finney |
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| Smiffy |
To the Wanderer.
Thanks for the schematics.Much appreciated.Well done.
Smiffy |
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| ljordan |
To the Wanderer
I was thinking about using jensen xformers instead of the ad8620s in (my) the output stage.
Would you be willing to share the audio sec of your diagrams? Also do you know why there is all that vacant space on top of the drive (circ. board). Seems to be for alt. DAC.
Lewis |
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| Wanderer |
| quote: | Originally posted by Smiffy
To the Wanderer.
Thanks for the schematics.Much appreciated.Well done.
Smiffy |
No problem. Sorry I did not get back to you on frequency - did not have time to study schematics myself yet - too much work lately...
| quote: | Originally posted by ljordan
To the Wanderer
I was thinking about using jensen xformers instead of the ad8620s in (my) the output stage.
Would you be willing to share the audio sec of your diagrams? Also do you know why there is all that vacant space on top of the drive (circ. board). Seems to be for alt. DAC.
Lewis |
I'll be happy to e-mail you the diagrams, will do it from home tonight (need your address though). I am using 7700 as transport-only, feeding external DAC, thus the only changes I'll be implementing would be disabling as much video as I can achieve (any ideas?) and improving digital out. |
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| chris ma |
Hi,
If anyone knows how to bypass the 7700's down converted digital coax output to external DAC I will be very interested. I am using it as a transport for CD, but still watch movies with it.
Chris |
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| Smiffy |
No problem Wanderer.Think it may be 45.1584MHz or 27Mhz.
Finneybear.
No real tweaks,just component changes in analogue section.Like you I couldn't find a 7000 manual.Only one place and they wanted £78.To much.The 7000 is easier to work on than the 7700 as its all conventional components and a single sided board.Op amps changed to LM6172.Sprinkling of Black gates(also in analogue supply)and Caddock resistors.LM6172 needed forther de cpupling as the were oscillating.
This is still a good dvd player and to my mind has a better picture than the 7700 but the ntsc pulldown on the 7700 is noticeably better and as I have a lot of R1 discs I prefer the 7700.
IIf I ever get a 7000 manual I'll let you know.
Smiffy |
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| ljordan |
| If you want send me a PM and then I will email you. |
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| finneybear |
Smiffy,
Interesting to know that I plan to do almost the same as what you had done! Probably I will do more on the digi out and the psu. You may want to check out this page for some mod clues:
http://www.empiricalaudio.com/frmods.html
I will get 7000's service manual. After I have it, I can email you the schematics. |
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| ljordan |
| quote: | | I'll be happy to e-mail you the diagrams, will do it from home tonight (need your address though). I am using 7700 as transport-only, feeding external DAC, thus the only changes I'll be implementing would be disabling as much video as I can achieve (any ideas?) and improving digital out. |
My email is on. Yours is off.
Please send me your email add.
Thank you very much
Lewis :) :D :eek: :smash: |
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| Will |
hi finneybear,
I'm also using the S7000 as a transport. Please e-mail me the schematics. Thank you !!
will.;) |
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| Smiffy |
Finneybear
Many thanks.
I found the LM6172s made the most difference but the needed de-coupling with 0.1uf polycarbonates (Wima)as there is no local decoupling next to the original Mitsubishi 5238s and JRC2114s.The Black gates took ages to burn in but I also have a non modded 7000(got 3 of them actually,dirt cheap from E bay)to use as a reference.If you could send me the audio diagram and poss digital out diagram as well that would be great
Many thanks
Smiffy |
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| finneybear |
Will, I will move to a new place soon. After everything is settled down, I will go get the service manual.
Smiffy, again, thanks for the tip. it will be interesting to know whether the 7000 or 7700 will make the better transport. Got the 7000 from ebay, too. Probably I will also get a 7700. Plenty of used 7700s available everywhere. I still think it's a better idea to use 7000 alone as a transport. It's simply too packed inside to do a major mod. |
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| Smiffy |
Yes,loads more room in the 7700.Audiocom clock mod on the way.Will pop LM6172s in the 7700.Just wondering if its possible to change the component video out to RGB.
Smiffy |
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| finneybear |
| It really depends on how Sony implemented the RAMDAC in the 7700 and where it is located. Will need to check the schematic first. If it can be possibly done, the video signal quality will still be a concern. |
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| Will |
Ya' Know,
I'd be very keen to find out where the I2S raw digital info is at, the tap it out and feed it directly to 4x TDA1543. That would make a non-oversampling DAC and effectively a real music making machine. :smash: |
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| Smiffy |
Word clock,data and bit clock are pins 1,2 and 3 on the CXD8799N dac chip if thats any help Will.
Smiffy |
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| Will |
Thanks for that info Smiffy.
Now to locate that chip and tap it.... phew with all those SMDs :cannotbe: |
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| ljordan |
I also have a 7700.
I would like to use an external DAC or add a better DAC chip.
I have the au-218 bd (1/3) and au-218 bd (2/3) scans(thanks to Smiffy and Wanderer).
How would you go about tapping a coaxial output?
I use the 7700 for headphones only.
I have rearranged the pwr supply to the left side.
The tranny just fits on the back and the two pwr boards on top of each other. Put a steel partition running front to back between the new pwr sections and the rest (au, drive and vid). The hardest part was extending all the power wires.
I also put in sockets and replaced the buffers(205 207) with ad8620s.
Right now I feeding my HP amp directly from the DAC. I tried it w/o the caps (212 & etc) but dc is present so I put my tap down stream of the caps.
Do I need to cut the trace from the caps (my tap) to the buffers/filters?
Lewis
:o :smash: |
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| Wanderer |
Was anyone able to pull out I2S out of 7700?
P.S. Lewis, you never replied to my e-mail. |
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| Will |
Smiffy,
I did a search on my S7000 and couldn't find that CXD8799N DAC chip. Where's it ? |
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| Smiffy |
Hi Will
Sorry.Thats the one in the 7700
The dac chip in the 7000 I can't remember.I'll have a look later and see if I can find any inf.
Smiffy |
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| fcserei |
The dac chip in the 7700 is a Sony badged PCM1716 using the EIAJ format, right alligned 20 bits, WCK= 48MCK.
The 7000 has a proprietary Sony filter and pulse dac, but for cd only the easiest way to obtain the non oversampled EIAJ signal is directly from the pins of the CDX 2545 decoder. After that ist is mixed together with the mpeg decompression and hard to get back in any meaningful form. |
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| fcserei |
Sorry for the typo:
EIAJ format, right alligned 24 bits, WCK= 48BCK.
The easiest way to build no oversampling dac player based on the 7000 or 7700 is a pair of AD1651 and an inverter.
To have i2s you have to delay WCK by one BCK. |
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| finneybear |
Will, Smiffy, finally I had the time to open the 7000 (got it from eBay as well) and took a detailed look at the parts inside.
Now I know why both 7000 and 7700 can make a great transport. The clock section is really well done; however, the power fed to it is definitely a weak point. The clock signal wire from the clock section to the DAC section leaves something to be desired, too.
The CD/DVD drive is great. Yet I was surprised to see the flimsy metal cover. Definitely I will put some damping material on it. The machine chassis is a bit disappointing, too.
The power to the DAC definitely needs improvement. Probably some shielding is needed for the DAC board. Way too many digital noises around there.
The audio DAC is based on a typical Sony pulse DAC chip. Not much mod can be done there, I can imagine. Looks like the audio output section is the weakest part in 7000. I will be using the 7000 as a transport only. Have to figure out a good way to pull out clean digital signals. |
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| Will |
fcserei/ finneybear,
What does the "clock signal wire from the clock section to the DAC section" carries ? Any potential there to tap that signal and feed into a non-os DAC ? |
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| finneybear |
| Will, the clock is housed in the little metal box on the main board. At one corner, you can see a grey shielded cable go all the way to the DAC board. This is the clock, I guess? No service manual yet. Just a first peek into the 7000 interior. |
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| fcserei |
The clock on both the 7000 and 7700 is quite complex, several frequencies and plls.
The way to get the EIAJ (or i2s, with a little trick) is to tap the signals at the dac on the 7700 or at the cd decoder chip on the 7000, as I wrote. |
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| Will |
Hi there,
Did anyone manage to get the service manual for the S7000 ? Greatly appreciated.:angel: |
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| dafiiid |
| Sorry for digging this old post, but may I ask if anyone has the schematics for S7000? I would like to perform some mods on this player as a transport but I have got no clue on what to do. |
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