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Dead NAD???
Dead NAD???
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Old 19th October 2017, 03:58 PM   #11
Mooly is offline Mooly  United Kingdom
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Dead NAD???
Yes, its common on many players for the mechanism holding the laser and motors to lift up to meet the disc. As I say, I'm not familiar with the NAD though.

Have you tried cleaning the belt and pulleys with alcohol to see if it helps or not ?

Based on everything you have said, this would be the first thing to look at.

And although it sounds crazy, you could try with the player on its side and even held upside down to see if the mechanism then works and loads fully.
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Old 19th October 2017, 05:09 PM   #12
giblets is offline giblets  United Kingdom
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Righty!
Great news, she is working again! The cam mechanism for laser and motor that brings it up when the tray is closed had popped out. With a lot of effing and blinding I managed to get it into the right position for it to work (the gear that closes the tray and operates the cam had to be in a specific position.
Clearly as the laser/motor tray was not in the up position the device would not let it fire up.

Now to sort out the iffy open/ shut mechanism. Would it still be a case of playing round with the elastic band? Only other thoughts are it seems a little slow to seek and start up (but that could just be me).

many thanks for your perseverance!

nexts thoughts..... what about upgrading and modding it!

Last edited by giblets; 19th October 2017 at 05:37 PM.
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Old 19th October 2017, 06:38 PM   #13
Mooly is offline Mooly  United Kingdom
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Dead NAD???
That is good news Well done.

Yes, the elastic band is a favourite. Other issues can be dirty/intermittent micro switches.

Different player but similar in operation:
Sony CDP790 and KSS240 Restoration Project
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Old 19th October 2017, 07:18 PM   #14
giblets is offline giblets  United Kingdom
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Default Dead NAD???

Quote:
Originally Posted by Mooly View Post
That is good news Dead NAD??? Well done.

Yes, the elastic band is a favourite. Other issues can be dirty/intermittent micro switches.

Different player but similar in operation:
Sony CDP790 and KSS240 Restoration Project


Thanks, a great read, may have to have a go at some of it, definitely need to clean the circuit boards, covered in guff, and make sure all the gears are in good nick!
Not sure I'd have the confidence to adjust the setup, especially without an oscilloscope!
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Old 19th October 2017, 07:56 PM   #15
Mooly is offline Mooly  United Kingdom
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Dead NAD???
Most players are very similar in outline but yes, it is definitely a scope job for the electrical adjustments.

Boards generally clean up well. A good vacuum with a soft brush works well, and if there is any sticky greasy deposits or film over everything then a good wash in hot soapy water.

Post #10 (never wash transformers, motors and tiny adjustable coils (the sort with ferrite dust cores in them).

Washing an amplifier board
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Old 30th October 2017, 11:21 AM   #16
giblets is offline giblets  United Kingdom
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Default Dead NAD???

Think I may have spoken too soon!
Seems to be working fine... except at a very low volume (need to turn volume right up to hear it quietly). Volume is fine if I use a digital out (also tried different rca cables and different inputs on the amp).
Not sure if it is related by at this 'high volume' (90-95% power on the amp), you can hear a small pop when changing tracks.

Guess I could be resigned to using as a transport!?

Last edited by giblets; 30th October 2017 at 11:26 AM.
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Old 30th October 2017, 12:11 PM   #17
giblets is offline giblets  United Kingdom
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I should add that it's both channels, would all the muting caps cause this issue, and all go around the same time?!
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Old 30th October 2017, 01:38 PM   #18
Mooly is offline Mooly  United Kingdom
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Dead NAD???
There are probably muting transistors on the final audio output just before it leaves for the sockets. Unlikely for both channels to be faulty though. The faint pop will be normal and caused by the muting coming into/out of operation.

Is the overall level just low, or is it non linearly low meaning loud bits are normal and quiet bits seem compressed down in level (which would be a first for me). Again, this is where a scope comes into its own. A test CD with various levels would immediately show a problem or not. You can make your own test disc using Audacity and at higher levels a good DVM would show accurate output levels which would be around 2 volts rms for a 0db test tone.

Is the amp suitable, and not one with some very low sensitivity ?
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Old 30th October 2017, 03:46 PM   #19
giblets is offline giblets  United Kingdom
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Cheers for coming back, all the volume is low. The amp is suitable (ive had another NAD CD player plugged in one of the other RCAs, and tried this on two different sockets (originally had it plugged in the front but tried a rear when it didn't work properly).
There are four muting transistors before the sockets, as you say would be unusual for them all to have died.
As mentioned the volume it was fine using the optical out, both channels do appear to be working ok (other than the volume)
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Old 30th October 2017, 03:52 PM   #20
Mooly is offline Mooly  United Kingdom
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Dead NAD???
Low level would be an unusual issue. If you are 100% sure that the amp behaves correctly when any other player is used then the easiest first step is just to remove (or isolate the appropriate leg) of the muting transistors in at least one channel and see if the level comes up. Worth checking the DC voltage on the control line to them as well but do it before any series base resistors.
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