Hi. The problem related by Erdimeter looks like the one I encounter myself, described rather precisely higher in this thread. There seem to be a slight difference though: Erdimeter writes "if I load a cd manually it is work fine", which I can't do. Can't open or close the drawer at all. The only way to play a disc on my W16 is to open it (I mean open the whole player physically, cover and all!) and do the whole thing manually. Not very practical if I want to listen to more than one CD.
As I said before, I can't work any "servo" command (play, stop, open, close, next, previous...), whether from the 2 buttons on the faceplate or from the remote. All level or source commands work from the remote. But none of those concerning the disc itself. I didn't find the time to put it again on the bench. It takes some time to take the whole thing apart and get to the servo board, not saying that once you are on the Teac servo PCB (which is UNDER the DAC board), I'm not sure I'll be able to power up the machine without the DAC PCB in place. I'll have to check that.
But to give some kind of an answer to Erdimeter, I tested a few caps on the servo and the ones I tested were good (good enough!). I still have to do what I talked about on post #31. Too many different things I had to do prevented me to do that earlier. Not sure, as Rockeater mentions it, that caps are the culprit in this player. But it's not impossible. Considering the way it stopped working (after 15 days of holidays during which I hadn't -unfortunately -unplugged it), working perfectly before, commands not working after... I was thinking of a surge or so, which could have damaged a diode (would be lucky) or a chip (less lucky...). This I've got to check.
Sorry I can't give more information ;(
As I said before, I can't work any "servo" command (play, stop, open, close, next, previous...), whether from the 2 buttons on the faceplate or from the remote. All level or source commands work from the remote. But none of those concerning the disc itself. I didn't find the time to put it again on the bench. It takes some time to take the whole thing apart and get to the servo board, not saying that once you are on the Teac servo PCB (which is UNDER the DAC board), I'm not sure I'll be able to power up the machine without the DAC PCB in place. I'll have to check that.
But to give some kind of an answer to Erdimeter, I tested a few caps on the servo and the ones I tested were good (good enough!). I still have to do what I talked about on post #31. Too many different things I had to do prevented me to do that earlier. Not sure, as Rockeater mentions it, that caps are the culprit in this player. But it's not impossible. Considering the way it stopped working (after 15 days of holidays during which I hadn't -unfortunately -unplugged it), working perfectly before, commands not working after... I was thinking of a surge or so, which could have damaged a diode (would be lucky) or a chip (less lucky...). This I've got to check.
Sorry I can't give more information ;(
I would think then, that there could be communication (or a simple ribbon cable connection) problem somewhere.
On my 16, when I got it, it was not responsive because previous workshop reversed the ribbon from servo board to the DAC board (from where it goes to the display board).
If your players just failed one day, it would not be applicable, because ribbon cables do not jump out to reverse themselves, but on mine it was a man made fault.
What was funny, is that they marked the ribbon and the board with a number of lines in order not to reverse them, but they reversed them on the servo board end which they failed to mark...
The Wadia smarts should be OK, if the player still plays.
On my 16, when I got it, it was not responsive because previous workshop reversed the ribbon from servo board to the DAC board (from where it goes to the display board).
If your players just failed one day, it would not be applicable, because ribbon cables do not jump out to reverse themselves, but on mine it was a man made fault.
What was funny, is that they marked the ribbon and the board with a number of lines in order not to reverse them, but they reversed them on the servo board end which they failed to mark...
I would then check driver and receiver chips each side of the servo -> DAC - > display board.
The Wadia smarts should be OK, if the player still plays.
And maybe Erdimeter has something to add about the exact circumstances of the fail? I'm unsure to understand if he can open/close the tray or not (either faceplate or remote). Nice day to all 😉
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Rockeater thank you for your attention.
Was your 16 same problem with mine(work fine but no servo commands from remote or front panel)
What was the problem exactly of your 16 before reverse the flexible ribbon cable?
The previous owner tampered with it and wrote something on the ribbons. I think it's the same fault with your own 16.
Now, I'm worried that if I reverse the strip from the servo card to the dac card, there will be damage to the device. Also, if the ribbon cable is inserted upside down, Isn't it interesting that the device is still working?
How can I find the correct connection positions for flexible ribbon cables.
Can someone help me ?
Thank you very much in advance for your attention.
Hi erdimeter, which ribbon cable are you talking about? there are two at the front (near the faceplate), one connecting the servo to the DAC board, one connecting the DAC to the display (faceplate). There is one on the left side (facing the device), connecting servo and DAC PCBs, and one on the right side of the DAC PCB connecting to the PSU. As far as I can remember. Which is the one you would suspect to be wrong-sided?
But as you say, if the player plays the disc, it seems unlikely that a ribbon cable would be reverse positioned.
But as you say, if the player plays the disc, it seems unlikely that a ribbon cable would be reverse positioned.
Hi Jerome.
It was done after, some tuning stuff 😉
For what I remember they only come with some cooper/foil on some capacitor and chips.
Hi Perelman, the exact same problem with my 16. Did you try to change U491 µPD75212ACW or something else ?
@pedro, yes copper millimetric foils on chips, I can see that in some expensive pieces... Some experts say it's no use without being connected to earth, as I read in different places.
@erdimeter: OK, you say the same problem exactly. I'm glad we are two (sorry to say that...😉 which means it's something that can happen.
Did you notice something particular between the moment it was working and the moment it was not working anymore? some kind of surge, heat, or power cut?
To answer your question, no I haven't changed U491 yet. I've got one in case I'd need to try, but I'd like to check other components before, like I said in a post before. First, measure the tensions on some pins of the chip. And if they are not what they should be, investigate where it can come from.
I wonder if this µPD75212ACW can be replaced without programming the prom. I fear not. That's why I want to check if it is really defective before trying to replace it.
@erdimeter: OK, you say the same problem exactly. I'm glad we are two (sorry to say that...😉 which means it's something that can happen.
Did you notice something particular between the moment it was working and the moment it was not working anymore? some kind of surge, heat, or power cut?
To answer your question, no I haven't changed U491 yet. I've got one in case I'd need to try, but I'd like to check other components before, like I said in a post before. First, measure the tensions on some pins of the chip. And if they are not what they should be, investigate where it can come from.
I wonder if this µPD75212ACW can be replaced without programming the prom. I fear not. That's why I want to check if it is really defective before trying to replace it.
Regarding this problem with the cd controls i will try to get some info from a guy that work with Teac/Esoteric products.
you're right! but I don't know if Teac improves really the sound with this trick >0)
It would be interesting to have some information from him, certainly. This problem must not be common but it seems we are two facing it. Thanks if you can ask!
good evening
@perelman I bought it second hand from my partner and there wasn't any reaction before no servo operation failure, suddenly it was happened. By the way all the tests are ok related UPD IC(power voltages, clock freq,) All I have to do find a chip and replace it but I'm afraid there is software on the IC according to the product(cd, tuner, various componenet systems)
@erdimeter, you mean that U491 is fed normally? You mean VDD on pin 64 is at around 5V? What about the voltage at the cathode of Z403?
I just checked C491 on mine, which was OK. I forget C492, but I'd be surprised if it was defective.
Here is a detail of the recommended schematics you can find on the µPD75212ACW datasheet:
Chips rarely fail on their own. If the µPD75212ACW is defective, something has got into it (first thing I think of is a surge). I would be surprised that all of a sudden, both on your W16 and mine, it stops working. That is why I would suspect another component first. Then, I concede it's mainly because if it's the chip, it would certainly have to be reprogrammed to original specs. And this is far beyond my poor skills!
I just checked C491 on mine, which was OK. I forget C492, but I'd be surprised if it was defective.
Here is a detail of the recommended schematics you can find on the µPD75212ACW datasheet:
Chips rarely fail on their own. If the µPD75212ACW is defective, something has got into it (first thing I think of is a surge). I would be surprised that all of a sudden, both on your W16 and mine, it stops working. That is why I would suspect another component first. Then, I concede it's mainly because if it's the chip, it would certainly have to be reprogrammed to original specs. And this is far beyond my poor skills!
If I understand the datasheet, I see that VDD should be no more than 7V. Am I right?
If you measure tension on pin 64 at 8,2V, it might be too much... What are other tensions on pins, and do they change if you press the servo commands on your remote (play/pause/open/close etc)
Sorry I can't measure this right now, can't put the W16 on the bench right now... too messy at present.
Maybe we need some external advice to clear that point? (let's be patient 😉
If you measure tension on pin 64 at 8,2V, it might be too much... What are other tensions on pins, and do they change if you press the servo commands on your remote (play/pause/open/close etc)
Sorry I can't measure this right now, can't put the W16 on the bench right now... too messy at present.
Maybe we need some external advice to clear that point? (let's be patient 😉