dr*audio
Fish fingers and custard!
There you go! Or an Arduino.
Troubleshooting CD Players
- Thread starter dr*audio
- Start date
Opto5205
New Member
Those things are neat. Wish I had the inclination to muck around with them, that ain't happening these days. They're cool little gadgets though!
We have an Arduino Uno kicking around, I never got around to doing anything with it which is too bad.
Probably just as well because there is a shortage of Raspberry Pi's now.
dr*audio
Fish fingers and custard!
Did you find a source for Mabuchi motors?
eBay Listing
But the motor works when bench tested.
I didn't have to much trouble finding one.
Not the part number I first posted.
But the motor works when bench tested.
But the motor works when bench tested.
I didn't have to much trouble finding one.
Not the part number I first posted.
But the motor works when bench tested.
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1995 Onkyo DX-7210 will not detect/play CDs unless I 'bump' it by lifting the lower left corner of the chassis about 1 cm with my finger and then free fall drop the unit. Works perfectly in all other respects!
This problem manifested after a long period in storage.
I have taken the lid off twice now, and after poking around in there, and loading and ejecting the tray repeatedly, I just can't figure out the glitch. I don't see any problem with the way the tray moves or is aligned after it goes in. I have wiggled and pressed on the tray to no avail.
I watch the tray go in, there's the normal faint whirring sound I remember, the cd lens carrier moves up, and then only the lens by itself does a little up/down/up/down dance, the whirring continues for a bit, the whirring stops, and then the CD tray goes back out ejecting the CD. The behavior appears to be exactly the same as trying to play an empty tray.
But if I load the CD and 'bump' the unit, the whirring stops, there is maybe a second of silence with no movement of any kind, and then the turntable motor starts up, the CD starts spinning, and all is well from there.
If, after 'bumping' it, I press stop play or turn the unit off, it starts playing again. I do not have to 'bump' it again to restart it. It only needs a bump after the tray cycles out and back in.
Seems to be some kind of tray issue? The tray has teeth on it, but I'm not sure where the belt is located. I don't see a belt.
It seems really weird to me that all it needs to start working normally is the kind of sharp 'bump' you get by dropping it from a short height. With the top off, I can also 'bump' it by rapping the side of the CD playing assembly/cage laterally with a screwdriver, but that method does not work nearly as consistently as giving it sharp, short vertical drop.
This problem manifested after a long period in storage.
I have taken the lid off twice now, and after poking around in there, and loading and ejecting the tray repeatedly, I just can't figure out the glitch. I don't see any problem with the way the tray moves or is aligned after it goes in. I have wiggled and pressed on the tray to no avail.
I watch the tray go in, there's the normal faint whirring sound I remember, the cd lens carrier moves up, and then only the lens by itself does a little up/down/up/down dance, the whirring continues for a bit, the whirring stops, and then the CD tray goes back out ejecting the CD. The behavior appears to be exactly the same as trying to play an empty tray.
But if I load the CD and 'bump' the unit, the whirring stops, there is maybe a second of silence with no movement of any kind, and then the turntable motor starts up, the CD starts spinning, and all is well from there.
If, after 'bumping' it, I press stop play or turn the unit off, it starts playing again. I do not have to 'bump' it again to restart it. It only needs a bump after the tray cycles out and back in.
Seems to be some kind of tray issue? The tray has teeth on it, but I'm not sure where the belt is located. I don't see a belt.
It seems really weird to me that all it needs to start working normally is the kind of sharp 'bump' you get by dropping it from a short height. With the top off, I can also 'bump' it by rapping the side of the CD playing assembly/cage laterally with a screwdriver, but that method does not work nearly as consistently as giving it sharp, short vertical drop.
dr*audio
Fish fingers and custard!
Banging on the the thing is not an acceptable troubleshooting method. You need to find out what is happening when it isn't working and what happens when you bang on it.
You need an oscilloscope to look at the rf waveform for starters, then if that is 1.5V p-p, look at the sled motor drive to see if it is trying to advance to read the TOC.
I appreciate what you're saying, but you gotta admit, we've reached a pretty funny place as a civilization when one needs an oscilloscope to troubleshoot a problem that can be kludged with a sharp ~50-2000g impact.
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Fomoco1649
Well-Known Member
Thank you, for your expierience & time
Henry Finley
Active Member
I got a chuckle too. I suppose the CD boom rubbed me the wrong way from the first day. An image oddly, but permanently etched in my mind was walking through a mall in about 1980 or 81 or so. (Remember the big malls?) I remember walking past the record store. There were no records, AT ALL. Seemingly overnight, records were gone from this earth. It wasn't a "phasing in" of CD's over a period of time. I was shocked at how immediate and final it was. Instead, I saw shoppers with anti-theft clear cases in their hand, looking at the CD case inside. Of course there was nothing to read. No place to print much on them. The record store and shopping experience was gone. Just a store full of anti-theft containers. My inward response: You don't have to worry about ME stealing one. Ever. And so it was...
Edit: I was a printer. My jobs came in on CD's. Put it in, do your Adobe work, and hit eject. Uh oh, there goes the day. Now I have to spend the rest of it taking the computer apart to get the CD out.
Edit: I was a printer. My jobs came in on CD's. Put it in, do your Adobe work, and hit eject. Uh oh, there goes the day. Now I have to spend the rest of it taking the computer apart to get the CD out.
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OK, it's all good. So let's keep it on topic. The topic being troubleshooting CD players. Thank you.
Mike
Mike
Hello you all!
First of all is a pleasure to be here.
I just bought a pair of Wharfdale Linton Heritage and an audiolab 6000a to pair.
Went to my parents house to get their Sony CD reader CPD-338ESD but when I try to play a disc it acts like this :
https://youtube.com/shorts/QGcCRZ9ec8M?feature=share
Anyone has any ideia of what it could Be? Any Sony CD players experts around here?
@dr*audio any idea of what it could be?
Thank you
First of all is a pleasure to be here.
I just bought a pair of Wharfdale Linton Heritage and an audiolab 6000a to pair.
Went to my parents house to get their Sony CD reader CPD-338ESD but when I try to play a disc it acts like this :
https://youtube.com/shorts/QGcCRZ9ec8M?feature=share
Anyone has any ideia of what it could Be? Any Sony CD players experts around here?
@dr*audio any idea of what it could be?Thank you
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For me, cd tech is still fascinating. So much noise-free music on a small, portable source that, with proper care, will outlive me.
I'm still buying them as often as my pocketbook allows. So, germane to the topic, this lovely thread, and the experts who contribute their valuable knowledge, is an oasis. It got my Marantz CD-63SE and my Denon DCD-1500 II up and running, and for that I am most thankful.
I'm still buying them as often as my pocketbook allows. So, germane to the topic, this lovely thread, and the experts who contribute their valuable knowledge, is an oasis. It got my Marantz CD-63SE and my Denon DCD-1500 II up and running, and for that I am most thankful.
classyharlan
Active Member
Sony D-E660 (CD Walkman)
With CDRs only, it intermittently fails. After inserting a CDR and pressing play, it makes a sound for a couple of seconds as if a gear is slipping, then it waits a couple of seconds, then repeats that a couple more times until it says no disc. Opening the cover while it is making this sound, the disc will not be spinning but after the gear slipping sound stops the disc table/spindle will turn, as if it had been trying to rotate but had been blocked.
It has no problem with CDs, only CDRs, and the problem is not consistent even with the same CDR. Also, it seems to be more likely to read a CDR when held at an angle during startup. There is no problem with playback once it successfully reads the disc.
With CDRs only, it intermittently fails. After inserting a CDR and pressing play, it makes a sound for a couple of seconds as if a gear is slipping, then it waits a couple of seconds, then repeats that a couple more times until it says no disc. Opening the cover while it is making this sound, the disc will not be spinning but after the gear slipping sound stops the disc table/spindle will turn, as if it had been trying to rotate but had been blocked.
It has no problem with CDs, only CDRs, and the problem is not consistent even with the same CDR. Also, it seems to be more likely to read a CDR when held at an angle during startup. There is no problem with playback once it successfully reads the disc.
Opto5205
New Member
That's typically what audio-CD players do with CD-R discs though. If it works well with normal pre-recorded CDs, then it's probably fine.
I always found my CD player works much better with CD-R discs if I turn up the laser power a bit. Problem is, it tends to shorten the life of the laser diode. On the other hand, even with pre-recorded CDs, it greatly reduces mistracking and gives a much nicer, clearer sound that doesn't have any 'fuzzy' crackling in it. I find audio CD players (unlike CD drives in computers) tend to crackle, and it's especially noticeable with music that has distorted electric guitar in it. More laser power eliminates that, and also allows the player to play CD-R discs.
Opto5205
New Member
Only problem is, to repair a $200 CD player from 30 years ago you need a $5 part that now costs $50. And, it's a really old part.
Or, you can buy a new CD player for $500.
Other than that, yeah, it's a pretty cool technology
I still have my lovely Philips CD920 player from 1993, when I was 16 years old. I need a new CD drive unit for it, a CDM12.1/05 because the old one was shot.
Sucker cost me something like 50 bucks, and it will take a month to arrive. This is a 5 or 10-dollar item at most.