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Marantz CD63 & CD67 mods list
Marantz CD63 & CD67 mods list
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Old 12th May 2014, 11:12 AM   #20321
lymmlad is offline lymmlad  England
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Quote:
Originally Posted by 6h5c View Post
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.
Thanks, Ray. I will pop the lid and measure again, this time at U210 and U214 later on and post my findings.
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Old 12th May 2014, 11:21 AM   #20322
lymmlad is offline lymmlad  England
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Originally Posted by lymmlad View Post
Thanks, Ray. I will pop the lid and measure again, this time at U210 and U214 later on and post my findings.
Duh!!! Sorry, correction, my measurement was .030V (i.e 30mv) and not .30V. I got the decimal point in the wrong place! Shows how dangerous I am!

But I will measure again later where you suggested and post the results.
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Old 12th May 2014, 11:27 AM   #20323
6h5c is offline 6h5c  Netherlands
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That looks better, 30mV is quite normal :-)
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Old 12th May 2014, 06:18 PM   #20324
lymmlad is offline lymmlad  England
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Quote:
Originally Posted by 6h5c View Post
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.
I have a 63 and have measured at U210 and U214 and get exactly 0.030V DC for each. What would you suggest, a 2.2uF or 4.7uF blocking cap for each? Alternatively, given such low values, are blocking caps actually required? Also, will fitting of DC blocking caps make an audibly discernible difference or is their primary benefit in amp protection?

Sorry for the questions!
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Old 12th May 2014, 06:36 PM   #20325
6h5c is offline 6h5c  Netherlands
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Any cap in series with the signal path will degrade sound quality, so it's best to use as few of them as possible. If your amp has a blocking cap at the input (most of them do) then you don't need one in your player. But you should check to be sure. 30mV is not high, but you can lower the DC offset further by using tight-tolerance resistors in the opamp filter, or use a trimming-circuit with a multi-turn trimpot.

If you are planning to build a DOS in the future, you do need a blocking cap anyway, as the DOS puts out a high amount of DC voltage because of the single-ended design. If you use a good quality MKP cap, the impact of the sound will be minimal. In that case it may be wise to invest in good caps in advance. If you use a mediocre electrolytic, you'll hear the difference :-)

Values between 2.2 and 4.7uF are fine, larger won't hurt.

Ray
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Last edited by 6h5c; 12th May 2014 at 06:41 PM.
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Old 12th May 2014, 06:42 PM   #20326
lymmlad is offline lymmlad  England
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Quote:
Originally Posted by 6h5c View Post
Any cap in series with the signal path will degrade sound quality, so it's best to use as few of them as possible. If you amp has a blocking cap at the input (most of them do) them you don't need one in your player. But you should check to be sure.

If you are planning to build a DOS in the future, you do need a blocking cap, as the DOS puts out a high amount of DC voltage because of the single-ended design. If you use a good quality MKP cap, the impact of the sound will be minimal. If you use a mediocre electrolytic, you'll hear the difference :-)

Ray
Many thanks, Ray. Yes, I will be using a DOS (nearly completed), and from what you say, the DC voltage may well increase. So I will measure DC voltages again when I have set up the DOS.

I will also investigate whether my amp has a blocking cap at the input.
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Old 17th May 2014, 05:39 AM   #20327
charas is offline charas  Greece
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Hi guys,i know that this question is off topic but i did search the web for answers and apart from lampizator site...nothing else.I have a Cambridge CD-3 player and i want to change the op-amps.Now it has 1 5534 or 5334 per chanell,i can't see well there,and because it has 4 x tda 1541,so there are 8 op-amps.The sound of this player is amazing as it is...but after i did change the op amps on the cd63 to lm4562 and did listen to the huge difference they did instead of the 2114....i say why not change them on the CD-3 too.It's not as easy as the 63 to change them....and i wonder if it will be worth it.Also considering of changing diodes 1N4004 to MBR1100.Any suggestions?
And by the way,i search for a service manual for Camridge and the results are 0000!!!!!
Thanasis.
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Old 17th May 2014, 09:59 AM   #20328
charas is offline charas  Greece
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And by the way what is this little board pointed with the red arrow?I have search pictures on the web..and i don't see this add on later???board, on the CD-3.
Thanasis.
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Old 17th May 2014, 10:56 PM   #20329
station is offline station
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Hi Guys,

I posted a while ago with a few questions about modding my CD67-SE. In the end I followed Ray's updated guides (on his site) and looked at posts on the this thread to help me work out stuff I didn't know about.

I've managed to complete most of the mods without any issues and the player sounds great. However I've got some outstanding points if you can help me answer.

1. Ray's guide says remove and wire jumper C655 - 658 - have you done this on your system? Do you recommend it?

2. C611 - 614 are red coloured Elna cerafines (100u/25v). The guide says replace with 220u/16v. The ones I ordered of at the recommended value were a smaller size than the existing ones. Do you just recommend leaving the existing caps in place or replacing them? If so what caps can you recommend/value?

3. Do you recommend bypassing the HDAM if you have replaced the OPAMPS and done all the necessary noise reduction? Is it work adding 220n SMD caps between pins 4 and 8?

4. I replaced CF01 with a 100u/16v cap, but it the original did not have polarity. I want to check I've got the +ve and -ve correct (I looked at a nearby cap that connects to lines leading to it to work it out, but unlike caps on the board, the negative terminal faces right, rather than left).

Any help on those points would be appreciated by this newbie modder. Thanks :-)

4.
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Old 18th May 2014, 12:35 PM   #20330
station is offline station
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Actually, ignore my previous post - seemed to have worked that out again.

One last thing - do you recommend removing the muting transistors above the HDAM circuit on the CD67 - what benefit can I expect?

Thanks

Station
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