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6-3-4-3. Test Command List
ID2
ID1
ID0
PARITY
L
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
L
H
L
H
L
H
H
H
H
L
L
L
H
H
L
L
H
H
L
H
H
L
L
H
L
H
L
L
H : PARITY or ID0 ~ 2 test point to be high (5V).
L : 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 CDL1100 (CDM-47) CONTROLLER.
The command will be latched by TEST down edge, and executed by
rising edge.
Command Setting
PARITY or ID0 ~ 2
TEST
6-3-4-4. 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 15Ω ± 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!!
Drive Action
Initialize Drive
Set Normal Speed
Set Quadruple Speed
Set x8 Speed (Wide Capture) for
Error Rate
Play Audio (from 23'47")
Tracking Servo on
Tracking Servo off
Play Audio (from 5'00")
Play Audio (from 55'00")
Set x8 Speed (Normal Capture)
for RF Level/RF Jitter
Partial CAV
Command Execute
Command Latch
W
V
U
6-3-4-5. 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.
6-3-4-6. 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 actua-
tor 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 (IC102).
6-3-4-7. Focusing (Focus Bias)
a. Insert any discs into the drive after the check of 6-3-4-4.
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.
6-3-4-8. 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 carefully
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.
6-16
FCS+
TRK+
TRK–
FCS–
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