Mod/upgrade NAD C 541i - Page 6

eplpwr · 18th March 2006, 10:17 AM

adinica,

I've compared the C542 output stage with the original in my C541i, and there seem the've made several improvements in design and component choices, like the OPA2134 instead of OPA2604, better caps et al.

I also note that the output of the C542 is "true to the original", in that they have two gain stages with positive gain. The C541i has an inverting stage first, followed by a unity gain stage: the result is an inverted output, which I think is bad engineering.

Since I didn't like the output stage of the C541i I've designed a new output stage (Gain=+4.5), using one OPA627 per channel. I am quite happy with the sound of it.

Best Regards,

adinica · 19th March 2006, 07:40 AM

Good luck and enjoy your player!

jean-paul · 22nd March 2006, 07:54 AM

Quote:

Originally posted by adinica
Hi!
Service manuals at www.sharefx.com
Nad 52X and 54X series! Enjoy!

At last an easy way for sharing schematics and service manuals. I uploaded a few this morning.

genki · 14th June 2006, 05:16 AM

Hi every one

Again, a question that previously asked by some one in this thread:

NAD is very bad at its mechanism. My C541 CD tray and mechanism is degraded now, and my CDP also has tracking problem. If any of you have experience with this, please share how did you solve the problem?

Do you think it's a good idea to change to a new mechanism? Is it too complicated to do so?

Many thanks and hear from you.

Guido Tent · 14th June 2006, 08:23 AM

Quote:

Originally posted by genki
Hi every one

Again, a question that previously asked by some one in this thread:

NAD is very bad at its mechanism. My C541 CD tray and mechanism is degraded now, and my CDP also has tracking problem. If any of you have experience with this, please share how did you solve the problem?

Do you think it's a good idea to change to a new mechanism? Is it too complicated to do so?

Many thanks and hear from you.

Hi

Many times the laser output power is dropped. Depending on the pick up unit, but usually you can increase it by carefully adjusting a small potentiometer.

best

genki · 15th June 2006, 03:39 AM

Quote:

Originally posted by Guido Tent

Hi

Many times the laser output power is dropped. Depending on the pick up unit, but usually you can increase it by carefully adjusting a small potentiometer.

best

Hi Guido Tent

what you said is a very popular practice among audioplayer in my city. I have checked my CDP and it doesn't have problem with the lens. The problem comes from the mechanism. I have lubricated the rail on which the lens moves, but seems not work. I'm thinking of tweaking the NAD by having a new mechanism, but many said, it costs and complicated.

pwan · 15th August 2006, 03:25 AM

I thinking of buying the NAD c521BEE. How is it compared with more-expensive C542?

Thanks in advance.

ccontreras · 1st November 2006, 03:11 AM

C541i mods

Mosez · 1st November 2006, 04:30 AM

Excellent set of pictures ccontreras, really impressive.

Can you tell us more about the mods that you performed please?

ccontreras · 2nd November 2006, 04:12 PM

Thanks!
I will try to be precise since my English is not very good

1.- points white: caps blackgate FK 2200uf / 35v (before 1000uF 25v)
2.- point orange: cap Blackgate 1000uf / 16v (before 470uF 16v)
3.- points yellow: Opams AD826 (before OPA2604)
4.- points blue: caps blackgate 47uf / 25v (before 470uF 25v)
5.- points black: Auricaps 4.7uf / 200v (before 100uF 16v)
and removed muting transistors

I need suggestions and advice... thanks

18th March 2006, 10:17 AM	#51
eplpwr diyAudio Member Join Date: Feb 2003 Location: NE	New output stage adinica, I've compared the C542 output stage with the original in my C541i, and there seem the've made several improvements in design and component choices, like the OPA2134 instead of OPA2604, better caps et al. I also note that the output of the C542 is "true to the original", in that they have two gain stages with positive gain. The C541i has an inverting stage first, followed by a unity gain stage: the result is an inverted output, which I think is bad engineering. Since I didn't like the output stage of the C541i I've designed a new output stage (Gain=+4.5), using one OPA627 per channel. I am quite happy with the sound of it. Best Regards, __________________ Pelle

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19th March 2006, 07:40 AM	#52
adinica diyAudio Member Join Date: Mar 2005 Location: bucharest	Good luck and enjoy your player!

14th June 2006, 05:16 AM	#54
genki diyAudio Member Join Date: Mar 2006 Location: Hanoi	Hi every one Again, a question that previously asked by some one in this thread: NAD is very bad at its mechanism. My C541 CD tray and mechanism is degraded now, and my CDP also has tracking problem. If any of you have experience with this, please share how did you solve the problem? Do you think it's a good idea to change to a new mechanism? Is it too complicated to do so? Many thanks and hear from you.

15th August 2006, 03:25 AM	#57
pwan diyAudio Member Join Date: Apr 2006 Location: Earth	I thinking of buying the NAD c521BEE. How is it compared with more-expensive C542? Thanks in advance.

1st November 2006, 03:11 AM	#58
ccontreras diyAudio Member Join Date: Feb 2005 Location: santiago	C541i mods

1st November 2006, 04:30 AM	#59
Mosez diyAudio Member Join Date: Oct 2004	Excellent set of pictures ccontreras, really impressive. Can you tell us more about the mods that you performed please?

2nd November 2006, 04:12 PM	#60
ccontreras diyAudio Member Join Date: Feb 2005 Location: santiago	Thanks! I will try to be precise since my English is not very good 1.- points white: caps blackgate FK 2200uf / 35v (before 1000uF 25v) 2.- point orange: cap Blackgate 1000uf / 16v (before 470uF 16v) 3.- points yellow: Opams AD826 (before OPA2604) 4.- points blue: caps blackgate 47uf / 25v (before 470uF 25v) 5.- points black: Auricaps 4.7uf / 200v (before 100uF 16v) and removed muting transistors I need suggestions and advice... thanks

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