Maxmel wrote:

Hi , I'm just wondering if it's possible to adjust or at least verify the
laser of a DVD or CD player without a laser beam checker.

I have a 500MHz scope and a god expertise in electronics but never play with
DVD/Cd laser Assy.

Problem is the DVD player doesn't play always the DVD inside , lens has been
cleaned.

I'm assuming that these steps are standard for all tha models.

Also , what is the difference between the laser of a DVD and a CD ?

Why a DVD laser can read CD and not the inverse.

Thanks a lot for your help.


To verify that the laser is operating remove any clamps or items that
would block your direct view of the lens and glance at it when it should
be reading a disc.
The laser is focused to read a disc that is close to the lens, so it
will not be focused on your eye's retina. While I would not advise
staring at a CD/DVD laser for any length of time, a passing glance will
not cause eye damage or injury even if you do it a thousand times!

However this will not verify the correct output power or the sensor's
ability to read the reflected signal from the disc.