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Old 30th January 2005, 03:13 PM   #1
drews is offline drews  Italy
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Default tweaking marantz cd84

Hi to all,

I have some questions about marantz cd84.

I see that is like cd74 and other Philips (cd104-304).
For dac it use a TDA1540P x2 and SA7000,10,20,30.
I search into the forum and i have found datasheet for all (thanks).
But I don't know nothing about opamp: my marantz have 4560dd jrc, and I don't know with wich oyher opamp I can replaced.
I have just replaced the capacitor on the signal (47uF electrolytics) with 22uF poliestere with bypass by wima red (0,33 uF) and also the resistor on the signal output with other (1% tollerance).
I want also replaced the capacitor and the power-supply: I have now 1 cap 4700uF 16v and 2 cap 3300uF 25v and other small cap. Is it possible replaced this cap with 3 4700uF electrolytics and bypass or there is another better solution?
And last question: Is it necessaty re-clock?

If somebody have experience with this cd player please help me.

Bye
Andrea
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Old 5th February 2005, 11:17 AM   #2
drews is offline drews  Italy
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I'm thinking to change the signal cable (from dac to RCA).
Which cable I can use?
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Old 9th February 2005, 06:50 PM   #3
renes3 is offline renes3  Zimbabwe
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HI,

Have you tried getting info on the op-amp stuff. My marantz has some Harris op-amps, and they sound very good. (ha-5137)
These are military grade ones!!
You could replace the op- amps with ad845 or ad797. I'm sure there is another alternative from Intersil if you cannot find the
ha5137.

René
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Old 10th February 2005, 07:14 PM   #4
drews is offline drews  Italy
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Hi renes3,

thank you for advise...
My marantz has 4560dd JRC OP-AMP. I'm sure that I can found op-amp better than 4560dd.
I will tried ti replaced the op-amp.

Bye

Andrea
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Old 20th February 2005, 08:31 PM   #5
drews is offline drews  Italy
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There is one crystal beetwen saa7000 and 7030. The frequency clock is 4,2336Mhz.
I see some clock module (for example LCAUDIO) but there is not this frequency. What can I do?

Thanks
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Old 30th March 2005, 12:52 PM   #6
oshifis is offline oshifis  Hungary
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Hi drews,

I have some experience with this CD player, I modified mine a lot. Just send me an email for more information, service manual etc.
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Old 14th November 2005, 03:42 PM   #7
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Default MARANTZ CD74

Hi,

I just upgraded a MARANTZ CD74 with NE5532 Signetics Dual Op Amps (exact pin match) by installing sockets on the boards.

The result is AWESOME - this CD Player now sounds just as good or better than any of the Bang and Olufsen CDX units I've restored.

Cheers,

Restorer in OHIO
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Old 14th November 2005, 08:32 PM   #8
guido is offline guido  Netherlands
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above it states that this 74 is much like the philips cd104 and the cdx is also based on that machine. So they should be very similar.
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Old 21st April 2007, 03:07 AM   #9
Fin is offline Fin
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Quote:
Originally posted by drews
There is one crystal beetwen saa7000 and 7030. The frequency clock is 4,2336Mhz.
I see some clock module (for example LCAUDIO) but there is not this frequency. What can I do?

Thanks
You could use an 8.4672MHz oscillator and deivide the output by 2 with a 74HC74 flip-plop.


Quote:
Originally posted by oshifis
Hi drews,

I have some experience with this CD player, I modified mine a lot. Just send me an email for more information, service manual etc.
Please tell us about your mods to the CD74........
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Fin
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Old 21st April 2007, 06:44 AM   #10
oshifis is offline oshifis  Hungary
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I made many mods. I will collect all what I did and post in 2 weeks.
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