instructions for CDM PRO2 player with 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
you begin, please have the following ready.
conductive mat over workbench or a hand grounding wrist strap.
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
” Loctite” Super Glue – Gel Control
Small Bend Tweezers
the player lens facing down and remove the 4 Torx no.10 screws
holding the PCB.
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.
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.
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.
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.
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.
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
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.
over the player and remove the 4 screws holding the black plastic
cover with T6.
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
the two screws holding the motor with T6 and remove the motor
from the player.
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.
13 to 15 please red it first, but you might want to do this at
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
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.
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
Reassemble the black plastic cover removed in step 11.
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.
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.
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.
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.
the unit into the jukebox and test.