CD player does not detect CD - pickup problem?

[cm]

After struggling with both Philips CD players as mentioned in the firts post, ( one is a CD player and the other is a mini sound system ) and replacing both the CDM12.1 with new VAM 1202s, both the crappy stuff still says no disc.

Swapping back the older CDM 12.1 into the CD player and tweaking the variable resistor, the CD players comes back to life again, but only for a few days.

I am rapidly coming the conclusion as Jean Paul - scrap these crappy stuff. If new lasers cannot work on two different systems, there must be other common problems. I noticed that the head moves up and down a couple of time but is still unable to detect. I will try replacing the TDA 1300 lazer diode amp and it it still does not work.........philips

Both systems uses the same circuits, TDA1300, SAA 7372s and 3 TDA7073.

Any suggestions from anyone that is constructive before I go into a destructive mode?

[jean-paul]

for clean the lens of Pick-up,using the "alcohol"is right, but the "alcohol" not same the normal alcohol (ethanol,C2H5-OH), true name is "lsopropylalcohol",the chemic name are "C3H3O",our factory using this solvent for lens clean in every day,for plastic CD/DVD lens no problme is ok too.

Isopropylalcohol is safe ( it is the main component in lens cleaner for cameras ) but in general people misunderstand when just the term "alcohol" is used. The chance that they will use (m)ethanol is high hence my advise to use distilled water.

[X.G.]

Yes,Isopropylalcohol is hard to find.

I add a advice:cleaning the inner glass(below the lens) is more importan,but much be careful.

good luck.