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Old 5th May 2011, 12:55 AM   #11
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hi tief, have you tried using another cd mechanism to your nad player,if you have tried and it works the problem is with the old cd mechanism but if the new cd mechanism also does not work. the problem maybe on the mcu like what have you said. you may resolder all its legs or replace it a with new one.
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Old 5th May 2011, 02:46 AM   #12
singa is offline singa  Singapore
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Hi, worst to worst try reheating or reflow with a heatgun or better a smd
rework station gun of the mcu and laser signal processor chips.Works for
notebook PCs.Other than that you need to trace the relevant cd drive signals
and mcu. Good luck.
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Old 5th May 2011, 06:15 AM   #13
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by tiefbassuebertr View Post
P.S.
I don't understand this term:
.........maybe it is spillage
Liquid damage by customer... coke, tea ... the cat lol, have seen it all
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Old 5th May 2011, 12:07 PM   #14
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Quote:
Originally Posted by Mooly View Post
Liquid damage by customer... coke, tea ... the cat lol, have seen it all
I see; in this case this wasn't happen.
NAD's TROUBLESHOOTING GUIDE isn't helpful, because there is no distinction whether the CD turns on or not (see attachement).

By Sony and some other CD player service manuals there is described, how I can perform the conversion into the service mode.
Perhaps this is also possible by NAD, even if there isn't to read about this in his service manual.

P.S. two other NAD devices (1 pc same model, 1x C521) with same error I will get next week. Therefore I will try to get the same model in right condition for comparative measurements.
Attached Files
File Type: pdf NAD C521BEE TROUBLESHOOTING GUIDE.pdf (21.6 KB, 35 views)

Last edited by tiefbassuebertr; 5th May 2011 at 12:11 PM.
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Old 5th May 2011, 12:14 PM   #15
Bill_P is offline Bill_P  United States
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tiefbassuebertr, check your PM for a message.
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Old 23rd May 2011, 09:50 AM   #16
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Quote:
Originally Posted by ghosthunter123 View Post
hi tief, the problem maybe on the mcu like what have you said. you may resolder all its legs or replace it a with new one.
Friday I get two other devices with same error as to read by post #1, one from the same model and one similar (C521BEE)
By both devices I desolder the CXD3017Q (PCM prozessor) and the M38223E (custom made MCU from Mitsubishi) completly. After remove the lead-free solder residues from the pCB and the IC's itself and after carefully cleaning this aeras I resold the same ICs with normal leaded solder.
Now both cd player works fine.
The same work I do by the exemplar, which I get first (shortly before start this thread). Unfortunately here I haven't success. The same is to observe as mentioned by post #1.
No of this three NAD devices are from me, and therefore I cannot risk to replace both ICs in succession from the faulty device in the worked device (otherwise I would get a corroborating evidence resp. fixing, which devise is the reason).
How can I clearly establish without this step, whether Sony's CXD3017Q is the reason for the still present fault or Mitsubishi's custom made MCU for the operating instructions ?
The problem is, if there is only one interrupt or GND short between the CPU Interface of CXD3017 and the MCU (nine leads) still the same error details are to observe (except the clock line).
Entering into the service mode would be helpful, but how can I do this?

This hifi system from Sony uses also the CXD3017 (Service Manual):
http://elbase.ru/app/webroot/files/t...X1/HCDCPX1.pdf
Quote:
Originally Posted by Bill_P View Post
tiefbassuebertr, check your PM for a message.
Thank you therefore.

Last edited by tiefbassuebertr; 23rd May 2011 at 10:19 AM.
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Old 24th May 2011, 01:48 AM   #17
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thats nice that both NAD cd players are working now. for the sony player cd mechanism have you tried adjusting the pickup lens gain using the chip variable transistor on the side of the main cd lens? hope it works
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Old 24th May 2011, 09:54 AM   #18
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Quote:
Originally Posted by ghosthunter123 View Post
thats nice that both NAD cd players are working now. for the sony player cd mechanism have you tried adjusting the pickup lens gain using the chip variable transistor on the side of the main cd lens? hope it works
I don't understand this, because the marked terms I have never heard before.
Perhaps you mean the variable resistor of the APC unit (APC = automatic power control of the laser light from LD about the MD).
By cd player produced later than 1985 this variable resistor is "on-board" by the most optical pick ups. And produced before 1985 this resistor is often to find on the main PCB near by the RF amp unit.


Now the device mentioned by post #1 works also fine. There was an easy reason and nevertheless "hard to find" (with help of comparison measurements by scope by an other device of the same model).
There was an unwanted but relatively small transition resistance (contact resistance) between PIN18 (TE) of the RF-IC U101 (CXA2581N/620P57) and R220/R218 (goes to SE/TE input of CXD3017Q).
Thus the TE signal at this point was approximately 60 percent of the right value. If there had been a completly PCB wire break, it would be an easy task to fix this failure. Unfortunately the PCB wire oxidizes near by PIN18 of the RF-IC U101.
After create a completly break of this wire, the behaviour while try of read-in wasn't different than before.
After bending up of this PIN and free wiring repair was done.
The reason for this corrosion effect isn't clear for me because no bad caps are present near by this aera.
However - thank you very much for your ideas and support.

Last edited by tiefbassuebertr; 24th May 2011 at 10:06 AM.
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Old 28th May 2011, 04:27 PM   #19
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I have a NAD 521i. It was lying idle for the better part of 5 years till I decided to use it again. I didn't use it since the mains was configured for 110 Volts and I live in a place which has 230V mains supply and therefore had to use step down transformer and was not very happy with the arrangement.
Last week I decided to modify it internally so that it it could natively accept 230V directly. Opened the top cover and had a close look at the transformer PCB and the live PCB. After studying it carefully I removed 2 jumpers on the transformer PCB and connected one that was missing, effectively putting the 2 primary coils in series configuration compared to the earlier parallel configuration.That was all that was needed. The NAD powered up. No problems.
But the tray would not open. Discovered that the loading drive belt was broken. Replaced that and the loading mech was functional again.
Loaded a CD and it read the TOC. That was great. Pressed play and nothing happened for a long time. Could hear the lens squealing trying to track the CD but of no avail. It would just not play. I then tried another CD. This time after some squeals it worked. Out of 10 cd's it plays only one or two.
All original cd's no CDR's. Reads TOC and then stops. Does not play any tracks.
Replaced the Optical block which is incidentally the same KSS-213C. No improvement. Same symptoms.
Replaced the eletrolytics C105-C110 & C229, C226 but of no avail.
I am tempted to replace C212, 27pf which form the RC circuit for the tracking servo. Not done that yet.
What I have noticed is that when the lens is trying to track the CD and is squealing the IC U201 BA6392 becomes VERY HOT to touch at around the tracking pin outs PIN16 & PIN17. When it is not tracking the IC is at normal temperature.
Any suggestions as to what else could be the problem.
Like tiefbassuebertr I see that there is a lot of flux residue on my pcb and will give it a through wash with IPA to see if will help things.
My case differs slightly from yours that it reads the TOC and then does not read tracks on 80% of my cd's.
What could be the problem? Am dying to get this done with so that I can listen to the NAD once again.
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Old 30th May 2011, 01:41 PM   #20
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The service manual is very poor, at least from my view. So you need also
another device of the same model in good functional condition for performing comparison measurements while the "read in" process.
How looks the RF Signal while read in of TOC and while play of one of your few CD's?
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