DISK WILL NOT SPIN
The problem is in Slider mechanism,that can't switch on the Servo control circuit, that's stock up ,due to accumulated dust and dirt that's hardened the grease,it's need to clean and change the old grease.
First thing you want to see if the
unit’s laser is in good working order. This method isn’t foolproof, but most of
the time works admirably. When you insert a disc, see if you can look up
underneath where the disc sits on the turntable. Observe the laser lens going
up and down. If the lens is trying to focus, that’s good! After a few seconds
of the lens trying to focus, the platter should start to spin. On almost every
CD/DVD unit I've encountered, the unit won't spin unless the laser has properly
focused on the surface of the disc.
f the unit spins up and and then
shuts down, you should check and make sure the laser pick-up assembly slider
mechanism is working without any obstructions and that the small chrome rail
that it slides on is slightly greased. Don’t go overboard with the grease
though, as too much can cause all sorts of problems.
The slider mechanism, depending on
the age of the unit and the manufacturer, consists of the small chrome rail, a
drive motor, a small gear assembly, and (in some units) a small belt that
drives the slider unit via the motor. This small belt causes all sorts of
problems. If the belt is broken or slipping, it can cause skipping, dropouts,
or simply no start up at all. Also, if the belt breaks in the middle of the
disc, the drive mechanism gets hair or dirt wrapped up into the gears, or the
pick-up assembly doesn’t return to the start position (called home), the unit
will (99% of the time) refuse to release the disc, causing it to become stuck
inside the unit. There’s a little micro or leaf type switch located at home
position that sometimes gets dirty or breaks and, causing this problem also.
If the disc starts to spin slowly
and doesn’t come up to speed, the spindle motor that’s attached to the
turntable platter is a common problem. There could also be a problem with the
spindle motor driver controller IC or the power supply regulator that supplies
voltage to the driver IC. If the disc starts to spin and then spins really
fast, or stops and starts to spin backwards, your problem is the laser pick-up
assembly or the servo control circuit.
Also, in a DVD/CD player there are many
complaints where the disc gets stuck inside of the unit. This could be as
described earlier, but there’s also what’s called a drawer/disc tray opener and
closer mechanism to contend with. On many models, old and new alike, there’s a
small belt that goes bad and wont let the tray open. You can usually put your
ear very close to the front of the unit and, if this is happening, hear the
motor spinning when you press the eject button. Another cause is the nylon
gears, which can get jammed up with dirt and dust. Also, in other cases, you
could have a motor problem, or the driver IC could be at fault. If you suspect
that the motor is at fault, simply measure the voltage on the tray motor while
pressing on the eject button. If the voltage comes up between 6 to 12 volts,
depending on the manufacturer, then the motor needs to be replaced
