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Old 23rd April 2007, 01:40 AM   #11
Fin is offline Fin
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Quote:
Originally posted by oshifis
I made many mods. I will collect all what I did and post in 2 weeks.
Thank you. That would be great.
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Old 7th May 2007, 01:47 PM   #12
oshifis is offline oshifis  Hungary
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Here are my mods:

1. http://tube.fw.hu/no_oversampling.pdf
2. Output opamp replaced to OPA627 (needs some PCB track cutting)
3. Output analog filter removed (see 2. and http://tube.fw.hu/defilter2.jpg)
4. Reclocking: http://tube.fw.hu/jitterkiller4.jpg (sorry for the poor picture, see PDF diagram above)
5. Electrolytic capacitors in the power supply replaced to same footprint, bigger capacitance
6. PSU diodes replaced to 3A Schottkies (1N5822 I think)
7. PSU stabilizers replaced to LM317Ts (needs additional resistors in the air)
8. Output coupling capacitor replaced to 4.7 uF/100 V WIMA MKS-4
9. Output cable replaced (initially with shielded, finally with twisted pair)
10. Better clock ckt on an external board, original Xtal moved to it (http://tube.fw.hu/internal.jpg)
11. C1 error flag SAA7020 pin 3 connected to a LED through a transistor driver, indicating correctable errors

Recently I bypassed the TDA1540Ps, and connected a TDA1541A on a piggyback PCB.

More recently I bypassed the OPA627 and currently I am using an external I/V circuit, but this is a different story... (see thread Laszlo's Valve Output Stage with Lundahl transformer)

I recommend starting the mods with the PSU board, that brought the biggest change in my case.
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Old 10th May 2007, 12:45 AM   #13
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Thanks oshifis

This is very helpfull.

Did the change to TDA1541A bring a big improvement?
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Old 10th May 2007, 08:01 AM   #14
oshifis is offline oshifis  Hungary
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Not so big as I expected. Perhaps the ambience is a bit better on some acoustic recordings. The 14-bit TDA1540P is a very good chip.
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Old 11th May 2007, 02:15 AM   #15
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Yes - I was curious about that. I have some machines with 1541 and some with 1540 and they all sound nice....but different. It is difficult to do a direct comparisson as it is not just the dac chips that is different - so it is interesting to hear about your experience where you have swapped the dac chips.
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Old 23rd December 2007, 01:46 PM   #16
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Smile Service manual request

I'm trying to restore some functions of a somewhat canibalised CD84 unit. It is playing fine, but lacks some of the important options (like the reset of the TOC - I need to use the power button for that ).

If anyone has it, a copy of the Marantz CD-84 service manual would be most welcome.

Also, If You are in a sharing mood, a CDM1 sm is also very welcome

My mail is ______@hotmail.com (just fill the blank space of the email adress with scorpioddmf).

Thx in advance!

P.S. Please be advised, the attachment limit is 10mb, so if the file is bigger, please use the split option in Your archiving program
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Old 9th January 2008, 07:42 PM   #17
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Anyone?

I've managed to acquire an CD-74 service manual in parts in the meantime, but the quality of the scan sometimes makes it dificult to follow (for example, it's imposible to read the values of some elements ).

Is there a "better" version available?

Cheers!
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Old 21st April 2008, 02:54 PM   #18
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Default CD74 service manual

I have a high quality copy of the CD74 service manual in PDF format. Please email me if you would like a copy.
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Old 22nd April 2008, 01:37 PM   #19
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Default Re: CD74 service manual

Quote:
Originally posted by westerndigital
I have a high quality copy of the CD74 service manual in PDF format. Please email me if you would like a copy.
You've got mail!
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Old 1st April 2009, 03:26 PM   #20
tsecw is offline tsecw  Hong Kong
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i have some MARANTZ CD84 ,but no work ,please send MARANTZ CD84 Service Manual to me ,thanks all

EMAIL=tsecwz2000@yahoo.com.hk
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