Philips CD650 sudden failure!

[homer09]

Hello,

I have a Philip CD650 cd player. It has a CDM-2 transport. I've tweaked a couple of caps, bypassed oversampling and lifted a few resistors. It has been working amazing for the past 10 years and even better since the mods i made.

But today it died. I turned it on, it was cold, hadnt been used in hours, popped in an original CD. Pressed played, heard music. Then i skipped forward about 5 tracks with the remote control. I waited for the 5th track to start when it flashed DISC ERROR in the display! Since then, it hasn't recognized a single CD that i've put in, doesnt even display number of tracks and play time.

I also had heard, in the past few weeks, i handful of random static screaches. A CD would be playing and then there would be a quick scratchy noise, i would rewind to play the same part of the CD, thinking my CD was damaged, and then it would play perfectly... were these the warning signs of laser failure?

Now, this is what happens when i put in a CD: the CD does not spin, it is loaded and remains stopped (i can see through a little window). if i press play, i hear the transport moving but the cd remains stopped and then a get the DISC ERROR message.
if i leave a cd inside the player, turn it off and on, the CD begins to spin, i then get the disc error message and it keeps spinning for ever.

what i tried: opened it up, disassembled transport. the laser is not jammed, it rotates freely around its axe. the flat ribbon that connects the laser to the rest of the transport is also good, i tested all connnections with a multimeter. i then cleaned the laser using a dry cotton swab. it only had some dust. there were no signs of leaked caps or burnt electronics.

this resulted in no change.

where should i go from here, is it the laser that failed or something else? (the cd player does have thousands of hours of playing time in its 10 year history). is it possible to replace the laser?

i think i covered all the bases, but if i left someinfo out, please ask.
any help would be greatly appreciated, thanks.

[guido]

Open it up and remove the thing that holds the CD down.
Than switch it on without CD. You should see that the laser moves up and down and that the laser is on:

If you look at it from an angle you can see an orange glow around the lens. But you don't see then that the receiving diodes work.

Or you can wait until i get home and post the testmode here
Might be a bit safer. From the testmode you can see at what stage it fails.

There is a CDM-4 drop-in replacement for a CDM-2. But they are scarse i guess. Maybe it is possible to take a CDM-4 laser from a 'normal' CDM-4 unit and put it on the CDM-2. The spinningmotor of CDM-2 is said to be better than CDM-4 (brushless, less effects on the rest of the circuits).

gr

[guido]

Any docs for CDM4/31?

[homer09]

Ok, i got into test mode, seems to fail on laser focus. i think my laser did infact die

where should i go from here? dont tell me the player is as good as garbage...

does the cd960 use spdif or I2S?

[guido]

Ok, so you got to position 1 and it went back to 0. So laser focus does not work.

Open the player and remove the plastic holding the cd down (carefull, there is a spring loose then at the top). Now switch it on without CD.

Does the lense go up and down?

Does the laser emmit light (look at it from an ANGLE never straight into it. From an angle you can see a faint orange glow on the edge of the lense.

Greetings,

[Bernhard]

Originally posted by homer09
Ok, i got into test mode, seems to fail on laser focus. i think my laser did infact die

where should i go from here? dont tell me the player is as good as garbage...

Just kidding...

Why not buy a new one from ebay, they are cheap.

If you can not fix it, have used but good cdm2, will sell one for 10$ + shipping.

[homer09]

Maybe i got ahead of myself, this is exactly what happens when i go into service mode:

without a cd: stays at 0, no matter what

with a cd:
- if i press next, it goes to 1, but stays there for ever.
- then i press next again, gets stuck on 2
- then next again, makes a different noise, goes to 3 for about one second and returns to 0.

I removed the plastic part the covers lens, turned on the cd player without cd like you asked me to do. the laser lens does infact move up and down a few times everytime i push play. i then darkened the room and try to see if there was a faint orange glow emitting from the lens, i was able to see 3 red dots on the edge, i guess this is the glow you are talking about. it has to be coming from the laser since it turns off when i turn off the player.

so if there is a glow, my laser is still good? what is the problem then? if you want me to do any other tests, just ask.

thanks so much for the help.

[homer09]

thank you Bernhard

i will definetly consider buying yer cdm2 if guido can't solve my problem. you say they are cheap and easily available on ebay. is it just me, or am i unable to find any transports for sale on ebay?

[brianuk]

Hi guido,
Hi Homer,

Guido,
Can i do these service tests with my CD104 ?
I got the B&O service manual - many thanks, but my its complicated for a novice like me

Should the disc/motor be spinning when the laser is moving up and down ? mine does not, does yours at this point homer ?

I have to either fix it soon or return it for a refund from the guy i got it from - but i REALLY dont want to do that, i'd love to keep it

Guido,
Can you see where i should check for a voltage on the motor when it should spin the disc ?

Thanks.

I know, im a
Sorry guido, im just running out of time i can keep it

[guido]

=> It will always stay at a level, until you hit next!

0=standby
1=focus done!
2=disk starts spinning, arm goes to centre of the disk
3=start reading the disk.

So focus is ok, guess the laser is fine!

But now for your problem. Maybe the arm does not move ok.
Go to mode 0 and use f forward and f reverse to move the arm.
The arm should move quite quickly back and forth.

It is going to be difficult to do measurements. You need to do them on the pcb under the transport..

Guido