Marantz CD 94 sch - diyAudio
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Old 7th July 2005, 08:04 AM   #1
Zoran is offline Zoran  Serbia
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Join Date: Jan 2004
Location: Belgrade
Default Marantz CD 94 sch

Hi
Does anybody help
I need SCH for
Marantz CD 94 ...
Thanks
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Old 7th July 2005, 03:02 PM   #2
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Send me an e-mail and I will mail it to you
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Old 7th July 2005, 11:36 PM   #3
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Hi Zoran,

I modified this model and could help in case you get stuck..

zygibajt,

I wouldn't mind having a copy of circuit diagram too...
nsvircev@idx.com.au

Regards,
Extreme_Boky
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Old 8th July 2005, 01:01 AM   #4
Zoran is offline Zoran  Serbia
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Thanks Zygibajt (just mail You for the sch...)

Thanks Extreme_Boky i will aperaciate this.
what mods you are aplly...
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Old 8th July 2005, 01:05 AM   #5
Zoran is offline Zoran  Serbia
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note

I found that the Philips model
LHH1000 (transport unit)
has the very same chasis like Marantz CD94...
and separate converter units are very similar
just that
good night

want pics maybe...
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Old 8th July 2005, 02:01 AM   #6
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Here's the list of modifications I did to Marantz CD94 CD player:
Replaced power supply + local decoupling capacitors with my favourites - 2200uF / 35V FK and 0.1uF / 50 NX Black Gates. Capacitor’s paralleling should be avoided.
Installed IEC power connector at the back (silver and then gold plated pins.)
Replaced RCA connectors with high quality types.
Removed back-to-back output signal coupling caps and installed AURI cap 4.7uF / 200V types. You can also try Black Gate 4.7uF / 50V C type. The choice really comes down to your taste.
Used silver ribbon cables everywhere... got rid of connectors.
Used WIMA green-cap polypropylene caps for analogue filtering.
Replaced the xtal with 11.2MHz LC clock with dedicated power supply (with 10 X 470uF / 16V KF Black Gates + two 0.1uF / 50V NX types). The placement of two 0.1uF caps is crucial for obtaining low noise conditions. This is very important – otherwise you are wasting you money on (EXPENSIVE!) LC clock. I removed the original decoupling capacitor that was supplied with the clock (4700uF / 25V, I think...)
Replaced 6 dual ICs with AD8066, AD826 and OP275 in analogue stage.
Replaced two focus / tracking ICs with NE5532AN.
Removed in-series-resistors from the power supply rails and installed ferrite beads. You need a bit of experimenting and CRO to obtain low noise “environment”
(I spent a lot of time getting the CD cradle to run smoothly!)

I did not have the circuit diagram unfortunately. It would’ve helped with mechanism servo and RF, though.

Good luck,
Extreme_Boky
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Old 13th July 2005, 01:20 AM   #7
X.G. is offline X.G.  China
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Location: GuangDong China
hi,zygibajt

Could you share me the CD94 SCH?

X.G.@hifidiy.net

thanks

X.G.
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Old 13th July 2005, 10:40 AM   #8
Zoran is offline Zoran  Serbia
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Join Date: Jan 2004
Location: Belgrade
I look at the SCH...
I feel that is very good designed
Power Syply is better then usual
mechanics is very good

the tip is to override oversampling
(do not forget to back the mute signal fromSAA7220...)
and work on beter iv conversion


I will probably change the SPDIF cable and connector and use the
CD94 as a transport only
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Old 13th July 2005, 05:34 PM   #9
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I use Philips CD 960 which is just identical except for the front panel design. This is what I did in my player:

- changed virtually all electrolitic caps to Panasonic FC. I paralleled 3300uF instead of 6800uF
- instaled Kwak Clock 7
- 3 TDA1541A supply caps and SAA7220 supply cap to BG N (47uF) and removed bypasses on them
- changed tDA5141 for TDA1541A S1
- change SAA7220P/A for P/B version
- change 14 TDA1541 decoupling caps for 0,56uF (one of the best so far are orange Philips MKT caps here, they are even better then some polypropylenes in this location
- changed 5534 op-amps for OPA627BP, all 4 of them
- mounted Siemens MKV output signal caps, BG N are also good in this position, but not as good
- I bypassed all signal path traces from TDA1541 upwords with Cardas solid core enameled wire
- changed PS diodes for MUR860
- mounted IEC power socket

I still have to experiment with soldering transformers primary wires directly to IEC socket (there is some power filter over there) and i also didn't try bypassing big PS caps with orange Philips MKT so far (always worked very good in other players).

The bottom line is this player so far is the best sounding CD player from old Marantz/Philips players based on CDM drives and TDA1541A. I still haven't tried Marantz CD 80 and CD 94MKII (I probably won't as I move to building separate DAC-s and transports from the scratch), but I had Philips CD 304MKII with all the same mods applied and is much inferior to Philips CD 960/Marantz CD 94
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Old 13th July 2005, 06:02 PM   #10
dzkh63 is offline dzkh63  Hong Kong
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I'm looking for the infor. for this CD. Please send me the SCH.
dzkh64@i-cable.com
Thank You!
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