tweaking marantz cd84

drews · 30th January 2005, 03:13 PM

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

drews · 5th February 2005, 11:17 AM

I'm thinking to change the signal cable (from dac to RCA).
Which cable I can use?

renes3 · 9th February 2005, 06:50 PM

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

drews · 10th February 2005, 07:14 PM

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

drews · 20th February 2005, 08:31 PM

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

oshifis · 30th March 2005, 12:52 PM

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.

Terry Keith · 14th November 2005, 03:42 PM

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

guido · 14th November 2005, 08:32 PM

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.

Fin · 21st April 2007, 03:07 AM

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........

oshifis · 21st April 2007, 06:44 AM

I made many mods. I will collect all what I did and post in 2 weeks.

30th January 2005, 03:13 PM	#1
drews diyAudio Member Join Date: Jan 2005 Location: Roma	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

14th November 2005, 03:42 PM	#7
Terry Keith diyAudio Member Join Date: Jun 2005 Location: Columbus, Ohio	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 __________________ The Restorer

14th November 2005, 08:32 PM	#8
guido diyAudio Member Join Date: Mar 2002 Location: diepe zuiden	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. __________________ GuidoB

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5th February 2005, 11:17 AM	#2
drews diyAudio Member Join Date: Jan 2005 Location: Roma	I'm thinking to change the signal cable (from dac to RCA). Which cable I can use?

9th February 2005, 06:50 PM	#3
renes3 diyAudio Member Join Date: Mar 2004 Location: Uranus	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

10th February 2005, 07:14 PM	#4
drews diyAudio Member Join Date: Jan 2005 Location: Roma	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

20th February 2005, 08:31 PM	#5
drews diyAudio Member Join Date: Jan 2005 Location: Roma	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

30th March 2005, 12:52 PM	#6
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	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.

21st April 2007, 06:44 AM	#10
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	I made many mods. I will collect all what I did and post in 2 weeks.

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