instructions for CDM PRO/PRO2 turntable motor replacement.
is recommended that this procedure be carried out in a workshop.
mechanism of the CDM PRO module consists of delicate optical,
mechanical and electrical components; therefore, proper handling
measures have to be taken:
To avoid damage to the laser by Electro Static Discharges (ESD), service
technicians should be grounded during handling.
Excessive mechanical forces on any part should be avoided.
Storage in dusty, high temperature and high humidity environments should
Never touch the lens with your finger. Avoid spoiling the lens with
grease from the mechanical parts.
Work in a clean environment.
The Optical Pick Up unit has been carefully adjusted during manufacturing.
Avoid touching this part. Do not disassemble. Do not readjust.
Always use the proper tools to handle the unit.
Fast heating up (e.g. by bringing the mechanism from a cold place into
a warm and humid room) can result in moisture condensing on the lens,
thus influencing the playability for a certain time.
Before checking the performances, the mechanism should stabilize to
climatic conditions for at least 4 hours.
WARNING: INVISIBLE LASER RADIATION. AVOID DIRECT EXPOSURE TO THE LASER
BEAM. THE LASER BEAM CAN DAMAGE THE HUMAN EYE.
No. 6 driver
T10-Torx No. 10 driver
PCB-CD decoder and driver board mounted under
Before you begin, please have the following ready.
Electro conductive mat over workbench or a hand grounding wrist
6 Torx Driver (T6)
No. 10 Torx Driver (T10)
2 Small Flat Screwdrivers
Small Tweezers or Small Needle Nose Pliers
Low Lint Cotton Swab
Krytox GLP-204 Performance Lubricant
Soldering Iron with a fine tip
Shim 0.020in (0.5mm) thickness, you can purchase filler gages from
an automotive parts store
Loctite” Super Glue – Gel Control
Small Bend Tweezers
the soldering iron with a small tip and desoldering pump, unsolder
the flex foil harness from the turntable motor. To prevent damage
to the foil harness, do not apply excessive heat to the contacts.
With a small screwdriver lift the harness to make sure it has been
over the player and remove the 4 screws holding the black plastic
cover with T6.
Insert two small screwdrivers
under the hub of the turntable motor. Each one from opposite
direction. Start lifting the hub with both screwdrivers at the
same time so you do not bend the shaft of the motor. After the
removal of the hub, pay close attention to the magnet that is
located to the side of the shaft of the motor. Make sure the
magnet did not come loose or is missing. If it came loose, reattach
it with a small drop of “Loctite” Super Glue.
the two screws holding the motor with T6 and remove the motor from
a close attention to the replacement motor. The replacement motor
comes with a shorter shaft than the original motor you have just
removed; therefore a small modification is necessary for a correct
operation. Also on the back of the motor you will notice a red
dot (sometimes blue or other color). This is a DC motor and therefore
polarization of the terminals is important. The red dot should
be positioned toward the inside of the player.
Install the new replacement motor using the original torx screws and
resolder the flex foil harness.
Position the “shim” 0.02in on the top of the player next
to the motor so you will create a space between the hub and the casing
of the player. The space in not extremely critical, since the OP will
focus itself and readjust for the height. It is important, that the
hub not touch the casing. The hub should not be too high so it will
make a good bond with the motor shaft and the hub. It is important
to get the shim ready now, because after you apply the super glue to
the hub you will have only a few seconds before the glue dries.
Apply a small
drop of the super glue into the center of the hub. As you see on our example,
use only super glue in a gel form. This will
prevent “run off” of the glue and you will have a precise
control for the application.
Push the hub (with the glue) onto the shaft of the motor all the way
down until you touch the shim. The glue dries just about instantly.
Remove the shim and check to make sure the hub sits correctly and does
not touch the casing of the player. This is not a permanent bond. The
glue only helps to create an additional bond so that the hub will not
move during the operation. The shaft on the original motor was longer
with a larger surface area with more friction so the hub did not need
any additional bond to remain in the correct position.
the black plastic cover removed in step 11.