Marantz CD63 & CD67 mods list - Page 1974 - diyAudio
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Old 22nd August 2013, 09:43 PM   #19731
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It's ok thanks guys, one of the 7805s failed after first use.
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Old 23rd August 2013, 07:54 AM   #19732
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Ok, glad you got it fixed!
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Old 23rd August 2013, 07:57 AM   #19733
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Quote:
Originally Posted by badrisuper View Post
Hi
I have a problem with my CD67. I recently changed laser unit. After changing new one it is not reading any disc. I tried it in service mod. It plays when switch over to mod 3. If I press play button it is showing ERROR 10. Any suggestions?

Thanks
Badri
Hi Badri,

Must be something wrong with the new laser then, or maybe you didn't change it correctly. Have you replaced the complete assembly, including the disc and sled motor, or just the optical unit?

Ray
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Old 29th August 2013, 04:19 PM   #19734
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Default Decoder mistake

Hi all

According to an old post from Brent,
Marantz CD63 & CD67 mods list, Marantz made a small mistake with the decoder circuit.

I was wondering if it's important to fix this when adding separate regs to the decoder, or should I just leave it as it is?
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Old 29th August 2013, 04:50 PM   #19735
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Don't know if it will make a lot of difference soundwise, but if you're working on the decoder area anyway, you could change it. Marantz' schematic is not conform the decoder datasheet.
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Old 30th August 2013, 07:57 PM   #19736
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Quote:
Originally Posted by 6h5c View Post
Don't know if it will make a lot of difference soundwise, but if you're working on the decoder area anyway, you could change it. Marantz' schematic is not conform the decoder datasheet.
Marantz fixed this in the CD63 MkII KI player and did some changes to the decoder circuit. So this is not a problem in my player.
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Old 30th August 2013, 08:07 PM   #19737
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Oh, so it's an mkI problem. Didn't know that :-)
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Old 31st August 2013, 01:46 PM   #19738
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Quote:
Originally Posted by 6h5c View Post
Oh, so it's an mkI problem. Didn't know that :-)
May be I was wrong, from my experience even MKII KI has the same wrong connections in the PCB. I need to make some changes in the PCB to ensure the +5V supply to the digital and analogue circuits of the Decoder are correct.

See page 1911 thread #19107 and compare the PCB copper connections:
Marantz CD63 & CD67 mods list

Last edited by higlander; 31st August 2013 at 02:00 PM.
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Old 31st August 2013, 05:30 PM   #19739
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Quote:
Originally Posted by higlander View Post
May be I was wrong, from my experience even MKII KI has the same wrong connections in the PCB. I need to make some changes in the PCB to ensure the +5V supply to the digital and analogue circuits of the Decoder are correct.

See page 1911 thread #19107 and compare the PCB copper connections:
Marantz CD63 & CD67 mods list
You are correct highlander, the PCB layout around decoder is a bit different but the mistake is still there. I took the board out to trace.

The blue line in the pic shows that 5v go straight to pin 15 without going thru R508.
The fix is to cut the track between R511 and C513, near C513.
Then wire from C512 (pin 44) to C513 (pin 15).

I think I am correct on this.
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File Type: jpg DecoderFix.jpg (190.2 KB, 124 views)
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Old 3rd September 2013, 03:07 PM   #19740
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Quote:
Originally Posted by stefanom View Post
You are correct highlander, the PCB layout around decoder is a bit different but the mistake is still there. I took the board out to trace.

The blue line in the pic shows that 5v go straight to pin 15 without going thru R508.
The fix is to cut the track between R511 and C513, near C513.
Then wire from C512 (pin 44) to C513 (pin 15).

I think I am correct on this.
Fixed this on the decoder circuit. Also added separate regs (only 7805, SPowers later).
3x DAC
2x Decoder
2x Servo

Sound is now much cleaner and powerful, better bass. Less digital.
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