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Naim CDi servo board problem
Naim CDi servo board problem
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Old 9th July 2017, 11:48 AM   #31
Mooly is offline Mooly  United Kingdom
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Naim CDi servo board problem
OK, good luck
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Old 16th July 2017, 11:34 AM   #32
tiefbassuebertr is offline tiefbassuebertr  Germany
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Location: D-55629 Schwarzerden
I have exact this modell for remove a special issue. Unfortunately I haven't the genuine service-manual from Naim Audio or at least a schematic diagram.
Who can upload this?
This compact disc player works fine in all respects, as long I don't press the button "NEXT".
If I do this, the laser beam loss the track and don't find it again.
Now I must switch-off and switch-on again.
After do this the TOC is reading and after press the button "PLAY" the compact disc rotates and plays until the end.

This issue was already present from beginning (after purchase in brand new condition)
Unfortunately, the owner did not complain at his former hifi shop, since he assumed that the reason came from the compact discs itself.
I have replace several caps (the usual suspects) and re-solder several areas on the pcb's without any changes in the behaviour.

Therefore I think, the MCU is the reason.

I have find a Rotel-Player in working condition with the same MCU, unfortunately I haven't yet been able to invest the time for replace.

The thread therefore is here
Naim Audio CDI CD-I CD1 CD-1 CDS - only impaired Skip > Operation

An original schematic from Naim Audio would be helpful

Last edited by tiefbassuebertr; 16th July 2017 at 11:39 AM.
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Old 9th November 2017, 02:49 AM   #33
iqpi is offline iqpi  Australia
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A bit of an update.
I replaced the SAA7310 and now it seems to read TOC and plays CD ok.

However I'm not getting any sound. I will try to re-flow the 7310 later today and hopefully she will sing again. In the mean time any ideas?
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Old 9th November 2017, 08:30 AM   #34
Mooly is offline Mooly  United Kingdom
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Naim CDi servo board problem
Standard fault-finding applies

Its a long time for me (this thread) but you had a servo fault initially, and now you have it up and running by replacing the SAA7310 but now no sound.

I would work back from the analogue stages seeing what is present and what is not. Go around the audio processing chips with the scope and look for anomalies.
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Old 9th November 2017, 09:21 AM   #35
iqpi is offline iqpi  Australia
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Re-flowed the 7310 and still no sound.
Occasionally it spills out a cracking/pop noise but otherwise dead quiet.

This is unlikely but I'm thinking I might have received a bad 7310, I bought it on eBay after all. I do however, have another one on the way.

Muting circuit might be activated? But all my regulators seem to be ok, how about a dead relay?

Mooly my scope gave up on me a few months ago and looks like I wont have access to one anytime soon.
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Old 9th November 2017, 11:58 AM   #36
Mooly is offline Mooly  United Kingdom
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Naim CDi servo board problem
Analogue muting issues are usually easy to prove just by looking whether any relay (or transistors) are being actively driven.

If there is doubt then just connect a speaker (via a 220 ohm) to one of the analogue output opamp output pins. It will drive a speaker like that and confirm whether audio is present.
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Old 10th November 2017, 01:34 PM   #37
iqpi is offline iqpi  Australia
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Using the input I connect to different outputs at various amp stages all the way back to the output from the TDA1541A, got nothing. I measured the output pins (L&R) and sees ~2.2 volts so its ok in the mean time.

I used my iphone output and connect it to the inputs at various amp stages all the way back to the TDA1541A and I got sounds coming out from the output. So the opamp sections is ok.

Now I need to know whether the 7310/7220 or the TDA1541 is not "working". Any ideas on how I can test for the digital audio before the TDA?

Cheers
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Old 10th November 2017, 07:07 PM   #38
Mooly is offline Mooly  United Kingdom
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Naim CDi servo board problem
You would really need a scope and then its a case of going around every pin and seeing that nothing odd shows up. You can't check data lines as such but you can see if there is activity present and whether the logic levels are correct. Activity usually means a given line would be OK. If you have access to another player with a similar chipset then comparing DC voltages on all pins might just show something.

Faults like this are not easy though
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Old 13th November 2017, 10:31 AM   #39
iqpi is offline iqpi  Australia
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So I did a few more tests to isolate the problem. I got the eye pattern at the HF point so the laser is OK albeit not very clear. This line then goes to the decoder 7310 (pin 32) and out at pin 2. The waveform at pin 2 is not what expected, this waveform is the same as measured at the output posts.

Im I right in thinking either the 7310 or the 7220 is toasted? I'm leaning toward the 7310 because it is the decoder and the waveform measured at pin2 doesnt look like it is as it should. Ive already ordered another 7310 and a saa7220 so we will see which one is the culprit.

Any advice and suggestions are greatly appreciated.

HF point
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Output pin 2 of 7310
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Output posts
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Old 13th November 2017, 06:34 PM   #40
Mooly is offline Mooly  United Kingdom
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Naim CDi servo board problem
Try attaching your images directly to the forum. You might still see them as account holder but no one else can.
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