Unusual CD Playback Symptoms

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When not listening to my main system, I have a dandy little TEAC sr-100i that my wife and I listen to in our living room.

It's given us years of pleasure, but looks like it's finally showing some issues of wear. But these symptoms are none that I am familiar with.

1) The cd will finish playing, and the display will confirm as such. Then sometimes minutes, hours, or even late into the middle of the night, it will start playing again.

2) Lately it has been also been freezing during play, blaring a banshee digital screech, followed by returning back to the beginning of the CD and start playing again.

I have had failures with other equipment, where the cd playback will skip, or not play at all, but never as described above.

I'm not afraid to go into the unit to do any repairs, so long as all I need are a screwdriver, soldering gun and DVM.

I have taken it apart once to replace a noisy fan.

Just recently I also took it apart to clean the lens, but that seemed to be a temporary fix as the issues are back.

I have not tried lubricating any parts, or adjusting the lens tracking. (Neither of which I have ever done before, but have come across instructions on the web.)

Perhaps it just needs a new lens assembly, but I fear that the symptoms may be those of a main computer chip nature.

I have not been able to find a whole replacement unit, having long since been discontinued. I would really like to repair this myself if possible, as it is the only WAF component I have that I am allowed to grace our living room with.

If anyone has any ideas, I would sure appreciate the sharing of them?

Cheers!

Ed
 

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Whoa whoa whoa whoa, a CD player that has a fan?

Then sometimes minutes, hours, or even late into the middle of the night, it will start playing again.

Rule out lens. And the entire CD drive assembly actually.

Check the power supply for signs of degradation, change the external power supply if any, add a line filter (or some people call it power conditioner) for protection against fluorescent lamps/refrigerators etc.

Add: Could be the wireless stuff too if any
 
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You didn't mention whether the unit had been functioning in your home without problem and that the misbehavior itself is the only changed factor. That said, it sounds as though the control electronics may be getting sporadically reset and/or the micocontroller's input pins fooled in to falsely detecting modes of operation unprovided for the control firmware. Two reasons ,which I can readily think of, for this are power mains noise, and some marginal electrical part inside the unit.

Since you report having similar, though less severe, problems with other players you may have unusually noisy power mains. You don't mention how frequently the misbehavior occurs, but you might take the unit to a friends home, preferably in a different town, to see if the misbehavior persists there. Whether the problem is highly noisy power mains, or that the unit's control electronics are marginal in some resepct, I suspect that, unfortunately, simply replacing the unit will be the more cost effective resolution.
 
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Unit has maintained same location

Thanks Ken

The TEAC has been in the same location for several years.

I will try a power line filter and alternate mains as you suggest.

The other cd players I mentioned were stand alone units and unlike the current symptoms, they just stopped being able to detect a cd altogether. Though I wonder now if power fluctuations had anything to bring on their demise.

Sadly this model is no longer available. I may have to search for a similar zepplin all-in-one. Perhaps B&W still make one.

The other alternative is to use the iPod doc. Just need to pick up an iPod with the classic connector.

But maybe before I go the iPod route, I will test the radio and USB functions. See if they work okay.

One thing I should add is that when I recently opened the unit, I failed to mention I spotted a severely pinched ribbon cable going from the circuit board to the CD player. It would have been like that for years so only now am I thinking that could be the culprit now that you have mentioned pins. I could probably try moving it around while a cd is playing with the unit open. Sheesh I can't believe I may have overlooked the obvious.
 
When not listening to my main system, I have a dandy little TEAC sr-100i that my wife and I listen to in our living room.

It's given us years of pleasure, but looks like it's finally showing some issues of wear. But these symptoms are none that I am familiar with.

1) The cd will finish playing, and the display will confirm as such. Then sometimes minutes, hours, or even late into the middle of the night, it will start playing again.

2) Lately it has been also been freezing during play, blaring a banshee digital screech, followed by returning back to the beginning of the CD and start playing again.


I have had failures with other equipment, where the cd playback will skip, or not play at all, but never as described above.

I'm not afraid to go into the unit to do any repairs, so long as all I need are a screwdriver, soldering gun and DVM.

I have taken it apart once to replace a noisy fan.

Just recently I also took it apart to clean the lens, but that seemed to be a temporary fix as the issues are back.

I have not tried lubricating any parts, or adjusting the lens tracking. (Neither of which I have ever done before, but have come across instructions on the web.)

Perhaps it just needs a new lens assembly, but I fear that the symptoms may be those of a main computer chip nature.

I have not been able to find a whole replacement unit, having long since been discontinued. I would really like to repair this myself if possible, as it is the only WAF component I have that I am allowed to grace our living room with.

If anyone has any ideas, I would sure appreciate the sharing of them?

Cheers!

Ed
Such observations I had make too in any cases, but mainly at hifi/multifunction systems, where the complexitivity of the MCU-unit is larger than by ordinary single cd players and transports.
The reason of the mentioned unwanted effects is probably the processor from the operating/remote control unit itself or at their input pins (connected with remote control receiver and/or the nearfield keyboard logic IC's) are unwanted signals (like spikes), which released this unwanted operating instructions. For this reason I hate the visually very attractive hifi-systems and audio multifunction devices. After certainly, relatively short times the cost for troubleshooting and repair of such devices are unfortunately disproportionately high.
 
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Filters and change of location didn't help. The unit is now frozen in one spot on a cd. I can eject the cd, and try others, but nothing happens. It won't even load the TOC. I don't even hear any mechanical attempts internally. I've tried unplugging the power, and turning on again, and though it will physically load a CD, the display is frozen on the function word "CD". Though it may possibly be the MCU-unit or power supply, I've taken a chance and ordered a new laser with mechanism assembly. For what it costs, it's worth a try. The unit uses a Sony KHM-313aaa. We'll see how that goes. Probably take a couple weeks before the part arrives. Thank you everyone for your input.
 
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