Service instructions for NSM CDM 12 player.
Printer-friendly instructions.

This procedure is recommended to 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 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.

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)

Small Flat Screwdriver

Small Tweezers or small Needle nose pliers
Small Wire Cutter
Chip Lifter
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

After reading these instructions, if you still do not feel comfortable repairing the player, please no not despair it is not the end of the world, it will just cost you more. Send the unit to us for the service.

For the purpose of demonstration, we used a NSM CDM 12 player with legs and springs as used in ROWE/AMI jukeboxes.

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 harnesses attached to the PCB. The smaller one controls the motor and 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 already 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, which will result in friction, thereby preventing the motor from spinning. Remove the torx screw no. 6 holding sledge motor retaining clip. Lift the motor just enough for the worm gear to clear the idler gear. Carefully position the chip lifter tool under the idler gear and lift it, put it aside.

 

Step 4

With your hand move the OP on the sledge several times to the feel how easy it moves and finally position it to the left to clear the large gearwheel. Position the chip lifter under the large gearwheel as close to the center as possible and lift the gear. It should come up directly from the shaft. (In our demonstration the gearwheel came out with the shaft attached.)

Step 5.

Using the T6, remove the screws holding the retaining clips, while securing the sledge guidance shaft of the OP on both sides.

Step 6.

Lift the sledge guidance shaft of the OP on both sides at the same time and slide the top sledge actuator spring out of the sledge guidance plane and remove the old OP.

Step 7.

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 8.

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. With your finger rotate the worm gear attached to the sledge motor pushing it softly down until the OP moves about a ½ inch from the starting position. (Approximately into the middle of the sledge guidance shaft.) This assembly is securing the lateral shaft by mechanical stoppers. Use tweezers or a flat screwdriver to remove these stoppers and discard them.

Step 9.

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. 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 10.

Since the CDM 12 players are older units, it is important to follow this step. Inspect the original CDM 12 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 Instructions at this link, using Krytox GLP-204 performance lubricant available from Video Amusement or factory recommended Tribol 9890 grease.

Step 11.

Reinstall the OP into the player. Insert the actuator sledge spring into the sledge guidance plane first and than insert the shaft into both holders. Reassemble the shaft holders. Tweezers work the best in this process. Touch the shaft as little as possible; it has all the needed lubrication. If you need to reapply lubrication avoid excessive greasing.

Step 12.

CAUTION: This is the most critical part of the whole repair. Slide the OP all the way to the left to install the large gearwheel. Position the large gearwheel on the shaft, but do not push all the way down yet! You do not want to damage the black toothed bar on the OP. Carefully with tweezers push the toothed bar about 1/16 away from the large gearwheel. While pushing the toothed gear, push the larger gearwheel all the way down until you feel a soft snap. So not apply excessive force! The large gearwheel cannot touch the casing of the player. Slide the OP on the sledge several times to make sure it is not dragging and feels the same as in step 3.

Step 13.

Remove the old lubricant from the sledge motor worm gear, idler wheel and large gearwheel. Reinstall the idler wheel. Do not reverse position. See the image for the proper direction of installation. Add one dot of lubricant between pivot spring and sledge motor worm gear. Reinstall the sledge motor and secure it with the clip holder. Apply small amount of lubricant between the motor worm gear, idler wheel and large gearwheel.

Step 14.

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 15

Install the unit into the jukebox and test it. When installing the NSM player into the jukebox, pay close attention to all washers needed to properly level the player. There are special test CDs, you can use 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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