Service instructions for CDM PRO2 player with turntable motor replacement.
Printer-friendly instructions.

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

Caution

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.
WARNING: INVISIBLE LASER RADIATION. AVOID DIRECT EXPOSURE TO THE LASER BEAM. THE LASER BEAM CAN DAMAGE THE HUMAN EYE.

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

Place the player lens facing down and remove the 4 Torx no.10 screws holding the PCB.

Step 2.

As you carefully lift the PCB, you will see two flex foil harness attached to the PCB. The smaller controls the motor the larger one controls the data. With a small flat screwdriver lift the latches on both sides of the connector, while holding the flex foil harness. Slide the harness out. Do not pull on the harness forcefully. They should be loose.

Step 3.

Put the PCB aside and place the player lens facing down. When working with the player, be careful not to push the hub on the motor all the way down. It will touch the casing, resulting in friction, and the motor will not spin. With your finger rotate the worm gear attached to the sledge motor pushing it softly up until the OP moves about a ½ inch from the starting position. (Approximately into the middle of the sledge guidance shaft.) Try not to remove all of the lubricant from the gear.

Step 4.

Using the T6 remove the screws holding the retaining clips, securing the sledge guidance shaft of the OP on both sides. With the same T6 remove the two screws holding the nylon sledge guidance plane and put them aside. There is no need to remove any additional screws, gears or any other parts from the player in order to remove the OP.

Step 5.

Lift the sledge guidance shaft of the OP on the left side first while lifting the top of the OP from the upper sledge guidance shaft. As you remove the shaft from the holder on the left side, push the left side up to disengage the toothed bar from the large gearwheel. Once you clear the gears, lift the shaft on the right side and remove the OP with the shaft attached.

Step 6.

Place the old player aside. Familiarize yourself with the old OP. Pay close attention to this part of the OP. It is a spring-loaded toothed bar. During removal, if you are not careful it could possibly disengage this little wire-spring. If this happens, carefully reinstall it with the tweezers. You will need to compress this bar during installation process. You do not have to worry about this OP, since this OP is going to be discarded anyway.

Step 7.

PRO2 and PRO players are virtually identical mechanically. With the exception of the clip holding the large gear wheel. Unfortunately this clip does more harm than good. The way it is installed, it is applying an unnecessary pressure on the large gear wheel and causes the sledge motor to work considerably harder during lateral movement of the OP. The result is a drop of voltage to the turntable motor that considerably shortens the life of the motor. Turntable motor failure on PRO2 has been one of the major problems. The easiest correction is to lift the clip to relieve the pressure on the gear wheel. (PRO players did not use the clip and we never seen a problem with the large gear wheel coming loose.)

Step 8.

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 9.

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

Step 10.

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 11.

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

Step 12.

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 13.

Steps 13 to 15 please red it first, but you might want to do this at the end.

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 14.

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 15.

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.
Reassemble the black plastic cover removed in step 11.


Step 16.

Remove the new OP from the box. You will be reusing the original guidance shaft from the old OP. Remove one rubber stopper from the old shaft and slide the shaft out from the old OP onto the new OP and reinstall the rubber stopper. Gently lubricate the shaft after it is reinserted onto the new OP.

Step 17.

CAUTION: This is the most critical part of the whole repair. Carefully reinstall the new OP the same way as the old one was removed in step 5, of course in reverse order. Starting with sliding the right side of the sledge guidance shaft into the holder. Make sure the toothed bar on the OP goes under the large gearwheel. Than apply a little pressure and slide the left side into the holder. Touch the shaft as little as possible; it has all the needed lubrication. If you do need to reapply lubrication avoid excessive greasing.

Step 18.

Reassemble the shaft holders. Reassemble the nylon sledge guidance plane. Tweezers work the best in this process. Do not rotate the OP back to the "home" position. This will happen automatically upon the first power-up.

Step 19.

Remove the ESD clip from the OP flex foil harness and discard. Take the PCB and reinsert the flex foil harness into the connector. Insert it all the way down and push the lock down to secure the harness on both sides. Repeat with the other harness. Mount the PCB back to the player.
CONGRATULATIONS, you are finished.

Step 20.

Install the unit into the jukebox and test.

 

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