Marantz CD63 & CD67 mods list - Page 863 - diyAudio
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Old 18th December 2007, 08:37 AM   #8621
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What have you just changed? remind us

Brent
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Old 18th December 2007, 08:56 AM   #8622
quan is offline quan  Australia
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Question marantz 63 mod

Hi Brent -thank you for being there all the time
i basically follow Ray list-plus Kwak clock -HDAM bypass with 47R resistor- The op-amp caps are ZL 680uF/16V. Quan.,the power at U199 is 5.09 V. Quan.
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Old 18th December 2007, 09:07 AM   #8623
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No problem

It seems you still have the HDAM in use, as 300mV is the approx v out before dc blocking caps.
Have you removed R651 652 653 654 & C655 656 657 658?

Brent
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Old 18th December 2007, 09:10 AM   #8624
quan is offline quan  Australia
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Default 63 mod

Hi Brent, all removed. Quan.
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Old 18th December 2007, 09:19 AM   #8625
Thomo is offline Thomo  United Kingdom
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I'd check the opamp supply rails. I remember having neg voltage out of the opamps with one of the 12v supplies not connected

Lee.
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Old 18th December 2007, 09:32 AM   #8626
quan is offline quan  Australia
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Hi Thomo, how do i check the op amp voltage rail? Quan.
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Old 18th December 2007, 09:39 AM   #8627
Thomo is offline Thomo  United Kingdom
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Hi Quan. The same way you checked u199.

Measure the voltage at pins 4 & 8 on the opamps. These pins are fed from u208 & u209 just above the opamps.

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Old 18th December 2007, 09:47 AM   #8628
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Yep that's the next thing to check.

Too much voltage difference between the + and - regs and the opamp will output the difference from the lowest V to the largest V.

So I would say the +12V reg is lower voltage than the negative.

Brent
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Old 18th December 2007, 10:05 AM   #8629
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Hi Brent and Thomo- U208 measured 1.4V, u209 measured -11.81V. Quan.
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Old 18th December 2007, 10:11 AM   #8630
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That 1.4V should be 12V

Remove opamps (if they are plugged in) and re measure

Brent
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