Marantz CD63 & CD67 mods list - Page 2032 - diyAudio
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Old 5th May 2014, 10:45 AM   #20311
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My friend has asked me to construct a transformer Unit for him so that he can use it to change the stock Tx. on his CD63. Here is the TX unit after I spent some time to complete the job yesterday .
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Old 5th May 2014, 12:38 PM   #20312
charas is offline charas  Greece
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Many thanks higlander....superb!!!!!
The only thing i'm confuse..is why U305 continues upwards.Stupid of me!!
Regards,
Thanasis.
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Old 5th May 2014, 01:45 PM   #20313
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Quote:
Originally Posted by charas View Post
Many thanks higlander....superb!!!!!
The only thing i'm confuse..is why U305 continues upwards.Stupid of me!!
Regards,
Thanasis.
The reason is to put the connections in the correct order (from U305 to U312) so that when my friend connect them to the PCB the cables will not cross If you see the under side of the TX unit the connections are also in order from U305 to U312.

Last edited by higlander; 5th May 2014 at 01:48 PM.
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Old 5th May 2014, 03:58 PM   #20314
charas is offline charas  Greece
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Thank you higlander...got it now.
Match apreciated.
Thanasis.
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Old 5th May 2014, 05:35 PM   #20315
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Thanks for the advice Ben. Much appreciated. Well I've ordered everything except the flea - I'll see how these components go. Still, got my soldering skills back. Forgot how much fun it was to do stuff like this.
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Old 9th May 2014, 05:10 AM   #20316
charas is offline charas  Greece
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Quote:
Originally Posted by higlander View Post
The reason is to put the connections in the correct order (from U305 to U312) so that when my friend connect them to the PCB the cables will not cross If you see the under side of the TX unit the connections are also in order from U305 to U312.
May i ask 1 more question higlander?New tx's... 3 separate ones for the 63 arrived.I just wonder since the the 50va 2x12v will rase the voltage to probably 17v...what shall i do with the Q811 7805 regulator?Shall i leave it in place or change it with something else?
Thank you,
Thanasis.
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Old 9th May 2014, 06:08 AM   #20317
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Quote:
Originally Posted by charas View Post
May i ask 1 more question higlander?New tx's... 3 separate ones for the 63 arrived.I just wonder since the the 50va 2x12v will rase the voltage to probably 17v...what shall i do with the Q811 7805 regulator?Shall i leave it in place or change it with something else?
Thank you,
Thanasis.
There is no need to change anything, but you may take the opportunity to change the diodes to Schottky diodes.

Last edited by higlander; 9th May 2014 at 06:11 AM.
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Old 9th May 2014, 07:58 AM   #20318
charas is offline charas  Greece
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Thank you higlander...will change the diodes too.
Thanasis.
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Old 12th May 2014, 09:21 AM   #20319
lymmlad is offline lymmlad  England
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Quote:
Originally Posted by Ben Hanke View Post
A DC blocking cap should do the trick as you say. Either 2.2uF or 4.7uF should be fine.
I've just measured the DC offset measured it with the player 'on' but not playing a cd. Both channels measure the same at 0.30V. Am I right in thinking this is 30mv?

Also, have I measured it correctly by not playing a cd?

For the record, I have bypassed HDAMs and have opamps in place. I am almost finished my DOS board. Should I wait and measure again with DOS in place before fitting DC blocking caps?

Apologies in advance for my 'newbie' questions.
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Old 12th May 2014, 10:00 AM   #20320
6h5c is offline 6h5c  Netherlands
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Hi,

0.3V would be 300mV, and that's a bit high. I doubt the measurement is correct, because I've never seen such high offset (unless there's something wrong).

It's better to measure directly at the opamps' output, because the muting transistors will clamp the voltage to ground (if still in there). It's fine if the player is in STOP mode this way.

The outputs are at pin 7, or U210 and U214 for CD63, U216 and U217 for CD67.
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