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5-2-4-3. Test Command List
ID2
ID1
ID0
PARITY
ON
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
ON
ON
OFF : PARITY or ID0 – 2 test point to be high (5V).
ON : PARITY or ID0 – 2 test point to be low (Ground).
Command Execute
In the test mode, above listed function can be executed. Turn on
COMMAND SW on the back panel of CDJ-500.
The command will be latched by TEST down edge, and executed
by rising edge.
Command Setting
PARITY or ID0 – 2
TEST
5-2-4-4. Spindle Motor
Check resistance
a. Pull the spindle motor flexible cable out from the connector.
b. Measure the resistance between 3 motor terminals respectively
(u-v, v-w, w-u).
c. The resistance shall be 8Ω ± 10%.
d. Otherwise replace the motor.
Check noise from spindle motor
a. Listen carefully the sound from the spindle motor while drive is
spinning up.
b. If you hear the strong striking noise from the motor, it is sus-
pected that there is too much clearance between the bearing metal
and the shaft, that is; NG motor!!
Note: As the CDM-56 adopts the CAM motor for the spindle mo-
tor, clattering sounds of the ball bearings are produced dur-
ing spinning up and spinning down.
Differentiate these from slipping sounds.
48
Drive Action
Initialize Drive
Set Normal Speed
Set Quadruple Speed
Play Audio (from 23'47")
Tracking Servo on
Tracking Servo off
Play Audio (from 5'00")
Play Audio (from 50'00")
Partial CAV (x12–x24)
Command Execute
(RELEASE TEST button)
Command Latch
(PUSH TEST button)
W
V
U
5-2-4-5. Sled Gear Train
Check the mechanical burden
a. Disassemble the CHUCK HOLDER.
b. Check if there is any broken tooth in the gears.
c. Try to move sled gears by hand and check if it gets unsmooth in
certain position.
d. In case there is unsmooth protion, replace Base Unit Ass'y.
5-2-4-6. 2-Axis Actuator
Check Focus search operation
a. Disassemble the CHUCK HOLDER so that the optical pick-up
is exposed.
b. Turn on the drive power and watch if the objective lens moves
upward and downward.
c. If the lens does not move, check the resistance of the 2-axis ac-
tuator coils. It should be 6.1±1.1Ω between FCS+ and FSC–.
d. Otherwise replace the optical device.
e. If the coils are normal, replace the Driver IC (IC103).
5-2-4-7. Focusing (Focus Bias)
a. Insert any discs into the drive after the check of 5-2-4-4.
b. Check if the drive can make a focus.
c. In case of failure, it is possible that Focus Bias or Focus Gain
Servo circuit had not been controlled well.
d. So watch RF signal by a oscilloscope and see if the quality is
good or not.
e. In case the quality is not good, check servo circuit.
5-2-4-8. Laser Power
Check Laser beam
a. Disassemble the drive so that the optical device is exposed.
b. Turn on the drive power and look into the objective lens care-
fully while the drive is in process of focus search.
c. Check if the red beam comes out from the optical pick-up.
Warning: Do not look into LD beam closely with naked eyes.
d. In case of no beam from optical device, the LD must have been
broken down, so replace the optical pick-up.
FCS+
TRK+
TRK–
FCS–
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