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Troubleshooting CD Players

I have a problem similar to pimzel.
I have a Sony X111ES that I've brought back from the dead a number of times thanks to this thread and others on AK.
Most recently it was showing signs of a dirty home leaf switch as there was laser focus activity without a disc, but it would not spin when a disc was present.
I cleaned the switch and the lens and oiled the rail and after a couple of sputters, it read the disc and started playing.
It will play through an entire disc fine but if you try to skip tracks past about 30 minutes into the disc it stops playing and reads No Disc.
Would this be an indication of the laser going like you suggested for pimzel?
Thanks.
Mike
 
OK quick update.

After playing through a few 60+ min CDs, everything seems to be working great.
I'm thinking the oil just needed a couple of passes to get things running smoothly!.

Mike
 
Victor XL-V200

After a disc is inserted the sled moves a millimeter out from and back to home, then when the disc starts to spin the sled jumps inward past home, the gears which move the sled slip and it fails to read. This is intermittent.

If it reads the disc, then it will intermittently fail as above on trying to play track 1. (Push play, sled jumps inward, gears slip, failure)

If it starts playback, then the sled will intermittently jump back to home when trying to skip tracks.

Thanks in advance for any ideas.
 
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classyharlan said:
Victor XL-V200

After a disc is inserted the sled moves a millimeter out from and back to home, then when the disc starts to spin the sled jumps inward past home, the gears which move the sled slip and it fails to read. This is intermittent.

If it reads the disc, then it will intermittently fail as above on trying to play track 1. (Push play, sled jumps inward, gears slip, failure)

If it starts playback, then the sled will intermittently jump back to home when trying to skip tracks.

Thanks in advance for any ideas.
Click to expand...
This is really strange behavior. I would first check the rf signal with a scope. If that is ok, I would suspect the IC that drives the sled motor.
 
I have a strange problem with my Panasoniy RX-DT9.
When the device stands normal horizontal, then the CD starts to spin but does not play. If I skip some songs forward, then sometimes the music starts, but often is looping or even jumping back.
But if I tilt the device a little bit, then the CD runs from the beginning to end without any problems.

Here is a short video:

Any idea, what could be the root cause? A wear out in spindle motor bearing?
 
yammi99 said:
I have a strange problem with my Panasoniy RX-DT9.
When the device stands normal horizontal, then the CD starts to spin but does not play. If I skip some songs forward, then sometimes the music starts, but often is looping or even jumping back.
But if I tilt the device a little bit, then the CD runs from the beginning to end without any problems.

Here is a short video:

Any idea, what could be the root cause? A wear out in spindle motor bearing?
Click to expand...
Use your powers of observation:
1. LISTEN for scraping or ticking.
2. If you hear scraping, LOOK for what is scraping.
3. If you don't hear scraping, clean and oil the machined posts that the laser slides on.
 
Victor XL-Z311

The disc platter is slightly off level and the lens bobs up and down with each disc rotation as it reads, bobbing up higher as it approaches the edge. With each bob the lens also makes a rubbing noise, without touching anything else, later tracks making more noise. (Using a magnifying glass, there is visible clearance between the disc and chuck, so the noise is not from the disc tray wobble. Also the tray has been removed so that's ruled out as well.)

The lens also makes a lot of noise while skipping through tracks. (After hitting stop the noise does not continue as the sled returns to home, so the noise is not from dirty rails/sled gears.)

Presumably the moving parts in the lens enclosure are rubbing while focusing. Does that diagnosis sound reasonable, and if so is that fixable?
 
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classyharlan said:
Victor XL-Z311

The disc platter is slightly off level and the lens bobs up and down with each disc rotation as it reads, bobbing up higher as it approaches the edge. With each bob the lens also makes a rubbing noise, without touching anything else, later tracks making more noise. (Using a magnifying glass, there is visible clearance between the disc and chuck, so the noise is not from the disc tray wobble. Also the tray has been removed so that's ruled out as well.)

The lens also makes a lot of noise while skipping through tracks. (After hitting stop the noise does not continue as the sled returns to home, so the noise is not from dirty rails/sled gears.)

Presumably the moving parts in the lens enclosure are rubbing while focusing. Does that diagnosis sound reasonable, and if so is that fixable?
Click to expand...
You'll have to replace the disc table or flatten it. Good luck! Also check for debris stuck to the top of the disc table.
 
That is the correct test point, I think.
You need to set the horizontal sweep faster so you can see the eye pattern. This is an image I found on the internet. It should look like this, but it should be 1.2V - 1.5V peak to peak.
eye1.jpg


classyharlan said:
I tried this as the rf point:
https://www.dropbox.com/s/l15xxajc30w93i5/board.jpg?dl=0

"Results" are below:

probe grounded
https://www.dropbox.com/s/e4c0xk9awlk2pvp/scope_grounded.jpg?dl=0

probe not grounded
https://www.dropbox.com/s/abvlocvq25ubcjw/scope_not_grounded.jpg?dl=0

Thank you in advance.
Click to expand...
 
classyharlan said:
I maxed out the horizontal sweep and made a couple other changes and I can only just make out that there's an eye pattern there.

Are any of the settings able to be tweaked more, or do I just need to get a better scope? Or is the peak to peak readable even from this?

Current settings:
https://www.dropbox.com/s/ldbwclyuf5h3kdq/settings.jpg?dl=0
Click to expand...
Don't see any options for triggering. It is almost impossible to get cats eye display w/out triggering. (Leader 310 is very basic scope ).
Peak to Peak should be OK - my 2 cents.
 
classyharlan said:
Along with triggering, what other functions are necessary for a scope to be able to display a usable eye pattern?
Click to expand...
IMO triggering should suffice. Dual trace is not necessary for eye pattern, but is very useful. Check some of the threads for scope using and selection, as it may get to be too far of topic.
 
@classyharlan You might be able to get a stable cats eye with that scope by connecting the vertical input to the horizontal input, and setting the sweep freq switch switch to external and playing with the sweep var control. No guarantees...
 
Your scope needs to have a bandwidth of minimum 60MHz or it will not give a correct amplitude reading on the rf waveform. Can't tell what amplitude you're reading. What is the voltage per division on the input?
 
bandwidth / voltage per division (manual says "deflection sensitivity")

vertical: 4MHz / 20mV
horizontal: 250kHz / 300mV

So, not even close to usable. (Guess I misread the specs when buying this...)
 
I have a Bose Wave with a single CD transport. It has a small motor that runs a pulley through a square rubber belt.
Any source for this belt?
It's about 3/4" when slipped between calipers. .075 square in thickness.
The original belt had stretched out, belt slips and loading is compromised.
Ultimately, I'd like to get a stash of different sizes. I found several mid 80's, Sony CD players that need belts.
 
Hi audiophile friends! I just spent some of my hard earned money on a used Lyngdorf CD1. Regrettably, it does not spin the disc properly. After trying to start spinning for a few seconds (Moving the disc around just slightly) it displays ”No disc”. When I give the disc some help/boosing it manually with my hand (lid off), it ”grabs on” and picks up speed, playing normally. Some discs are played without any problem at all (Maybe 30% of my total?) Any idea!? Seems like a simple fix? Thankful for any help! Best regards, Erik,Stockholm
 
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