Service instructions for CDM PRO/PRO2 turntable motor replacement.
Printer-friendly instructions.

It is recommended that this procedure be carried out in a workshop.


The 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 be avoided.
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.

Abbreviations used:

T6-Torx No. 6 driver
T10-Torx No. 10 driver
OP-Optical Pick-up
PCB-CD decoder and driver board mounted under the unit,
ESD-Electro Static Discharge

Before you begin, please have the following ready.
Well-lit bench
Electro conductive mat over workbench or a hand grounding wrist strap.

Tools required:
No. 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
Desoldering Pump
Shim 0.020in (0.5mm) thickness, you can purchase filler gages from an automotive parts store
” Loctite” Super Glue – Gel Control

Optional Tools:
Small Bend Tweezers
Magnifying Lamp

Step 1.

Using 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 successfully unsoldered.

Step 2.

Turn over the player and remove the 4 screws holding the black plastic cover with T6.

Step 3.

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.

Step 4.

Remove the two screws holding the motor with T6 and remove the motor from the player.

Step 5.

Pay 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.

Step 6.

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.

Step 7.

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.

Step 8.

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.

Step 9.

Reassemble the black plastic cover removed in step 11.


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