sony 222ESD problem

[vlucian]

Hi there,
I have the following situation:
I ordered 20 oscon capacitors (68uF/20V) and start replacing all the green
caps of 47uF/16V around IC's. I tried to start the player: bad luck I think. I have the following:
- the player load the CD, read the number of tracks and show the total time of CD
- when I push the play button it appears to start playing but nothing
came out, I see the number of the track but it doesn't show the time of that
track. If I push next or previous, the number of played track it's changed accordingly but still no sound. Also it doesn't appear to change the speed of the spindle motor when, let's say, I go to the last tracks.
I rechecked all the caps and I'm sure they are soldered ok. Also I used for soldering a 220V iron not a low voltage soledring station. I really don't know what's going on and I begin to panic.
Please help me.
thanks
Lucian

[Mooly]

This is obviously something you have done

If the time counter on the display is OK and counts the seconds correctly playing different tracks that at least means the servos and front end are working.

Recheck all your work, check the polarity of all caps and check for solder splashes that may have fallen on the PCB etc.

After that you will need to measure supply voltages and start faultfinding.

It's most likely something really simple

[vlucian]

As I said, when it "plays" a track the counter doesn't appear at all. I think it only round the disc, show the number of the track that I choose and that's all. I will try to see if the laser move when a push next button.
Thanks for your ideas, now I'm rechecking all the job. I'm using a lens for finding posible solder spash or anything similar.
Lucian

I just found something very strange: for C102 (for those with schematic) I have one mark of polarity on one side of PCB and vice-versa for the other side. I checked the schematic and it appears I 'choose' the good orientation when I soldered that capacitor. But hmmm .. should I trust the schematic now that I saw there (on PCB) could be mistakes?

[vlucian]

I did the test: when I push the NEXT button or the number of a track the laser don't move. BUT if I 'help' it a little with the hand (I know how that sounds) then it goes to the track AND the counter for that track miracoulosly appear. Still there is no sound but ... I have a starting point.

[vlucian]

I solved the problem.. don't know how exactly. I cleaned the magnetic way of the laser and now it;s ok. hmm strange anyway...
thanks

[Scorpio(DDMF)!]

Nice to hear that you've solved the problem.

A little heads-up for the next time: if you unscrew the main PCB and flip it over (in order to reach the soldering side of it) be careful and check all of the cables that go from the transport to the PCB when you finish your work.

If some are even a little "pulled out" from their sockets, it can lead to weird tracking/playing problems. Also, run the cable from the spindle motor part of the transport PCB as far away from the cables that connect to the laser part of it - for the same reason...

Cheers!

[Mooly]

Yep.. pleased it's working.
It's always worth putting a voltmeter over electroylitics when it's on and confirm the polarity. Don't rely on pcb markings, if that's all you went off to refit them.

[vlucian]

Hi again..
Another day another problem.. same cdplayer
So, I put the player on pause, I turn the volume of amplifier to maximum and I find some audible hum in my epos speakers; then I push the CDP stop button, the spindle motor stops and the hum reduce ...let's say with 60% or more; then I power-off the cdp and the hum disappear. What can it be, what can I do?
thanks
Lucian

[Mooly]

It could be anything. Has this just happened since you started altering things. A quick 'scope check might help narrow it down.

[vlucian]

"Lucky" me .. I didn't check it before altering cdp. But I don't think it's connected to those caps replacements. I'm sure it's the spindle motor that somehow put that noise in audio path. Unfortunatelly I don't have a scope, I know it could be more easily with one but I have to manage the problem only with the schematic, a voltmeter and maybe some luck. I must say once again: the noise is barely present only at maximum volume (but, what the heck, it shouldn't be there!), almost dissapear when I press STOP (maybe there is some other kind of noise but that one from the spindle goes way) and all stop when I power off the player.
Lucian