Service instructions for CDM PRO player.
Printer-friendly instructions.

This procedure is recommended to 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 and operators 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 fingers, and 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 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)

Small Flat Screwdriver

Small Tweezers or small Needle nose pliers
Small Wire Cutter
2 Low Lint Cotton Swabs or Anti-static Foam Swabs
Krytox GLP-204 Performance Lubricant made by DuPont (substitute for factory recommended Tribol 9890 lubricant)

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.

You can put the old player aside, but first familiarize yourself with the part. 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. It this happens, carefully reinstall it with the tweezers. You do not have to worry about this OP, since this OP is going to be discarded anyway.

Step 7.

Remove the new OP from the box. There are a few subtle differences between these two assemblies. You will remove the OP from this assembly. The sledge motor worm gear has to be rotated in the opposite direction - down. This assembly is securing the sledge guidance shaft by mechanical stoppers. Use tweezers or a flat screwdriver to remove these stoppers and discard them.

Step 8.

To simplify the removal and prevent damage to the OP, cut the upper sledge guidance plane with wire cutters (see the picture) on both sides, carefully moving it away from OP. Remove the OP following step 5 above. Inspect the OP and make sure it slides freely on the shaft. You can discard this assembly or use it for additional spare parts. The turntable motor is compatible and should be used also. Please see the Service folder for turntable replacement service instructions.

Step 9.

Inspect the original CDM PRO for wear and tear. With a clean low lint cotton swab, wipe all exposed lubrication points of old grease and dirt. Discard the cotton swab. Make sure no cotton fibers remain on gears and rails. Lubricate the player according to the Factory Maintenance Instructions at this link, using Krytox GLP-204 performance lubricant available from Video Amusement or factory recommended Tribol 9890 grease.
(This step might be a little too much, use your own judgment.)

Step 10.

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 need to reapply lubrication avoid excessive greasing.

Step 11.

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 12.

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 13.

Install the unit into the jukebox and test it. There are special test CDs, to thoroughly test the performance of the player. The easiest way to test it is to play the 1st and last song of the CD. If the player works you are done.


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