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
Before you begin, please have the following ready.
Electro conductive mat over workbench or a hand grounding wrist
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 parts store
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
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.
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
toothed bar from the large gearwheel.
Once you clear the gears, lift the shaft on the right side and
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 loose.)
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
over the player and remove the 4 screws holding the black plastic
cover with T6.
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.
the two screws holding the motor with T6 and remove the motor from
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 dries.
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.
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.
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.
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.
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.
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
CONGRATULATIONS, you are finished.
Install the unit into the jukebox and test.