Marantz CD63 & CD67 mods list - Page 1884 - diyAudio
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Old 27th November 2012, 04:07 PM   #18831
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Quote:
Originally Posted by RCruz View Post
If you are sure it is the negative supply, you can connect it also to one of the (-) minus places on the board..... but you must be sure of it.... I do not recommend any modding untill you download the schematic from Ray´s site and study it carefully.

Why do you believe the digital out sockets are now beeing used for power in ?
What is it powering ?
Has the inboard TX been disconnected ?
I have a 13v dc power supply that plugs in there with phono plug on it. The posative is the centre of the plug and negative outer on the phono plug. But could it be an earth as i dont know what the blue and brown wire are that comes from under the board to the phono socket. Will thay be both posative
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Old 27th November 2012, 04:12 PM   #18832
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Originally Posted by bull041161 View Post
I have a 13v dc power supply that plugs in there with phono plug on it. The posative is the centre of the plug and negative outer on the phono plug. But could it be an earth as i dont know what the blue and brown wire are that comes from under the board to the phono socket. Will thay be both posative
Sorry forgot no the other transformer is still working i thenk the external is just runing the opamps
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Old 27th November 2012, 06:18 PM   #18833
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I think it was soldered to a contact right in front of the left main power caps but this has a posative symbol on. But working back through the lead from the exterior power supply it should be connected to a negative point. Does it matter with dc which way round iys wired any help would be great
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Old 27th November 2012, 08:11 PM   #18834
Puffin is offline Puffin  United Kingdom
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Bull (sorry I haven't seen a name for you) I think that you are likely to cause untold damage to the unit if you do not know whether DC current is polarised or not. Similarly you need to be aware of how to identify the positive and negative terminal of a capacitor, fitting them the worng way causes them to heat up and explode.

The fact that someone has used a phono socket to carry a DC supply beggars belief.

Your last few posts are very confused. I would suggest that you do some reading before going any further.

Rob.
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Old 27th November 2012, 08:25 PM   #18835
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Originally Posted by Puffin View Post
Bull (sorry I haven't seen a name for you) I think that you are likely to cause untold damage to the unit if you do not know whether DC current is polarised or not. Similarly you need to be aware of how to identify the positive and negative terminal of a capacitor, fitting them the worng way causes them to heat up and explode.

The fact that someone has used a phono socket to carry a DC supply beggars belief.

Your last few posts are very confused. I would suggest that you do some reading before going any further.

Rob.
Hi rob i have sorted all the caps now that i know there all marked on the negative leg. The problem i have is the white wire that feeds the outer sleave on the phono socket came off the board and im not sure were it was. I have looked at the phono plug that goes in the phono socket for power supply and the centre is posotive and the outer is negative so would imagine the white wire as come from some negative conection
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Old 27th November 2012, 08:31 PM   #18836
Puffin is offline Puffin  United Kingdom
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From what I can see from the photograph you posted is that the white wire MAY have been soldered to the main board ground plane (the whole of the upper surface of the board is the grd plane) However I cannot see why this would be done.

If I were you I would get a proper DC socket and attach it securely to the case. If the 13.8 power supply is a good low noise supply then it might be worth using it, if not.....

You say that the 13v supply goes to the op-amps. It looks to me as though the wires are attached to two 3 legged devices (one wire to each) that look like voltage regulators?

Last edited by Puffin; 27th November 2012 at 08:39 PM.
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Old 27th November 2012, 08:42 PM   #18837
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Originally Posted by Puffin View Post
From what I can see from the photograph you posted is that the white wire MAY have been soldered to the main board ground plane (the whole of the upper surface of the board is the grd plane) However I cannot see why this would be done.

If I were you I would get a proper DC socket and attach it securely to the case. If the 13.8 power supply is a good low noise supply then it might be worth using it, if not.....
Hi thanks for the help the power supply is rubish if i knew how to do it i would put it back how it should be as i was quoted £350 for a decent power supply.Wouldnt the phono socket need a negative conection as the centre is posotive. That may be why it was connected to the board like you said
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Old 27th November 2012, 08:44 PM   #18838
Puffin is offline Puffin  United Kingdom
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Did you see my edit?
Where in the UK are you?
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Old 27th November 2012, 08:46 PM   #18839
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Originally Posted by Puffin View Post
Did you see my edit?
Where in the UK are you?
Im in sheffield mate
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Old 27th November 2012, 08:55 PM   #18840
Puffin is offline Puffin  United Kingdom
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I'm a million miles away, unfortunately. I would have suggested we could have tried to sort it out together.
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