CDM 2/29 Problem – HELP!

[Bassivus]

Oh!
That's why I haven't got it. My mail server won't accept more than 10mb...

[aparatusonitus]

Originally posted by Bassivus
Oh!
That's why I haven't got it. My mail server won't accept more than 10mb...

I'll try to upload a manual somewhere, will let you now latter where to look.

[Bassivus]

stoolpigeon, Sorry for my jumped in conclusion, and thanks for the advice. Anyway I have applied small amounts of the solder on each contact and checked it when connected, with the DMM and it works.

[aparatusonitus]

I have uploaded Philips CDM0/1/2/3 service manuals at http://www.sharefx.com/index.asp?tab=today , you guys just have to register for free, manuals will be there for free download for 5 days. Enyoj!

[Bassivus]

aparatusonitus, THANKS

You are real

[stoolpigeon]

aparatusonitus, many thanks from me too.

Bassivus, do you mean your connecting cable works or the cd player now works?

[Bassivus]

No stoolpigeon,

unfortunately no. I came to conclusion that the new cable does what it is supposed to do, but the player still doesn't read TOC. All the measurements I have checked are fine except earlier mentioned:

Only thing I am able to find suspicious is that I don't measure nothing across the 2136, and the manual says I should measure +-400mV adjusting the pot 3146!

But I believe its because the laser doesn't lock in.

[tubee]

What does the cdm do? Check all wires first. If the laser cannot find focus point, the feedback loop from servo is disturbed and nothing happens further. (only some movements of laser focus)

[Bassivus]

Originally posted by tubee
What does the cdm do? Check all wires first. If the laser cannot find focus point, the feedback loop from servo is disturbed and nothing happens further. (only some movements of laser focus)

Hello tubee,



I have checked all the wires.
I indeed have found one that must have gone out during disassembly(see attachment). This was the 14 wire "extension" cable - flat laser c. to flat servo c. I was sure that will fix the problem... but nope.
Now some description of the "start sequence":
Immediately on power up disk moves a bit. Its like very little, like max 1 cm measured on outer rim of the disk. After 1/2 to 1 sec. disk spins quite fast and after about 1 sec. you can see second "initiation". Display writes: "disc".
With no disc in the tray you can see the lens going up and down for two times.

Thanks!

[tubee]

Do you see (without disc) a red light in the lens for a moment after pressing start? (Don't look straight in, but sideways!)

Does the laser arm move? Or changes position for a moment, or feels "powered" when you touch it with cdp switched on? If not check + and - 12 voltages on the servo opamp from servo board. Oh yes, you can only check this when a cd is put in (focus must be found) So you have to look under CDM.

Beware: ground yourself on heating tubes or so before touching laserprint connections, the laserdiode assembly is VERY sensitive for ESD! A pity
when a solid radial cdm is destroyed


Bad gnds can also often found too on that players (gnd connections to shield of decoderboard)


Good luck!