Marantz CD63 & CD67 mods list - Page 1899 - diyAudio
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Old 21st January 2013, 09:46 AM   #18981
6h5c is online now 6h5c  Netherlands
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If you do that, you are shorting the opamp's output to GND (for AC signals). Most of them are short-circuit protected, but I can imagine it's better no to test that too often...

The DOS won't mind, as long as there's a cap in series to block the DC signal. Otherwise you are in trouble
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Old 21st January 2013, 10:36 AM   #18982
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Originally Posted by 6h5c View Post
If you do that, you are shorting the opamp's output to GND (for AC signals). Most of them are short-circuit protected, but I can imagine it's better no to test that too often...

The DOS won't mind, as long as there's a cap in series to block the DC signal. Otherwise you are in trouble
Thanks RAY. As shown in my uploaded photo I used LM4562HA opamps in my CD63 SE and there is a blocking cap to get rid of the DCs. I don't have the 47R in series and it seems to me that there is no problem to the opamps But to play safe I think I better insert a 47R
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Old 21st January 2013, 01:51 PM   #18983
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Yes, it is the nicer way to do it that way. Plus you get better damping of the output signal if the relay contacts start to have a bit of resistance.
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Old 21st January 2013, 03:24 PM   #18984
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Originally Posted by higlander View Post
I bought it from the eBay which is sent from Hong Kong:
DPDT Signal Relay Module, 5Vdc, TAKAMISAWA RY5W-K Relay. Has Assembled. | eBay
Brilliant, thanks higlander! I don't know why I couldn't find that one myself. Just ordered one. It sounds like I'm going to need some film caps for the output if I'm going to fit it. Thanks for posting all the details on this guys.
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Old 21st January 2013, 03:59 PM   #18985
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Last edited by higlander; 21st January 2013 at 04:02 PM.
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Old 21st January 2013, 04:00 PM   #18986
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Brilliant, thanks higlander! I don't know why I couldn't find that one myself. Just ordered one. It sounds like I'm going to need some film caps for the output if I'm going to fit it. Thanks for posting all the details on this guys.
Hope you will get the relay quickly As to the DC blocking caps I use 4,7uF Mundorf Mcap MKP.
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Old 22nd January 2013, 04:06 AM   #18987
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I'll probably use 3.3uF silver/oils, as that's what I have on the input to my amp.
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Old 22nd January 2013, 07:21 AM   #18988
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Originally Posted by 6h5c View Post
Yes, it is the nicer way to do it that way. Plus you get better damping of the output signal if the relay contacts start to have a bit of resistance.
Hi Ray ... look your web for CD 63 KI Mods
then go to mods list

i feel my mods a little bit harsh now and looks
like i didnt finish some works

1
Disable muting circuit: remove QN24/25/91/92 and RN27/28
(cuts analog -12V to muting circuit)
i forgot did i desolder RN 27 & 28

2
Remove U207, U211 and U262 (and cut trace) to disable traces running to
headphone section. Decouple each muting line to GND with two 100n/X7R
at junctions U222/223 and output side to remove noise, coupled-in to analog
section from digital-out trace that runs in parallel with muting lines for several inches!!
looks like i didnt do this too, solder 100n to u222 & u223 ?
or u222 to u223 ? can you show me the picture ?


3
Please look the picture
where this 2 jumper cable from and goes ? ( one is u210 to c657 ? )
you didnt jumper c655 and c658 ?

Thank you, best regards
Attached Images
File Type: jpg CD63mkII-KI_Analog_2.jpg (170.8 KB, 129 views)
File Type: jpg CD63mkII-KI_Opamp_close.jpg (131.0 KB, 134 views)
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Old 23rd January 2013, 07:26 AM   #18989
Pocoyo is offline Pocoyo  Indonesia
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Founded Picture near Post 15000 by RC

Looks like i will do this mods Matthieu Splendid Work
Sometime, if i do heavy mods the CD will be broken.
I will change LM 7812/7912 with LM 2940/2990 - 12

Thank you RCruz
Attached Images
File Type: jpg Matthieu Splendid Work.jpg (176.8 KB, 117 views)

Last edited by Pocoyo; 23rd January 2013 at 07:29 AM.
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Old 23rd January 2013, 07:30 AM   #18990
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Another 5000 Post & 500 page to read

Come on pocoyo, READ !
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