marantz cd 65 modify to non-os /mute signal - diyAudio
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Old 14th August 2004, 03:16 AM   #1
pengxy is offline pengxy  China
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Default marantz cd 65 modify to non-os /mute signal

I rewired player to non over-sampling but bypassed saa7220 mute signal.
I don't know how to make the muting fuction working.
chips:mab8441,m4803a ,saa7220,tda1541
Anybody would help.
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Old 14th August 2004, 07:49 AM   #2
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It's only audio. Member of the non modular PCB design committee
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Old 15th August 2004, 02:23 AM   #3
pengxy is offline pengxy  China
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It works ok when bypass saa7220 but it has pops and crackles when skipping tracks and when the music starts. In my marantz cd65fb I can't find saa7210. To restore the muting function I don't know where to connect . It might be M4803a (don't have datasheet).
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Old 15th August 2004, 10:31 AM   #4
guido is offline guido  Netherlands
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My cd650 has a M4804A instead of the 7210. Never got much info on it, but i can swap with a 7210 and the player still works.

If the 4803 is also 40 pens, checkout pen 11 with a scope or multimeter. You should see it change state when playing starts.

The MAB is a controller.

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Old 17th August 2004, 02:09 PM   #5
pengxy is offline pengxy  China
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I don't have saa7210 to swap but m4803a pin 11 is mute . The muting function of my player is ok when pin 23 of saa 7220 connected to pin11 of m4803a. I bypassed digital filter with muting fuction restored.

thanks a lot GuidoB & jean-paul

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Old 15th September 2004, 04:11 AM   #6
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Default Marantz CD65 info?

Hi, I just picked up on this tread. I have just bought a CD65 and know nothing about its quality, performance etc.

It sounds OK but my modified Denon DCD615 is a lot more detailed. Any suggestions on some basic mods I could make or info on machine is welcome. (I am a complete novice at mods the denon was done proffesionally).

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Old 1st October 2004, 08:52 AM   #7
pengxy is offline pengxy  China
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1.The decouple caps of tda1541 are good to be replaced by some hi-quality caps .
2. If you don't like ic 's sound put tube after tda1541 .
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