Sony CDJ-500 Service Manual page 49

Check Laser Current
a. Touch the IOP test land IOP on the MA-C30 Mounted Board.
b. Measure the voltage generated by the laser current while the
drive in process of focus search.
c. It is supposed to be about 4.5V because the voltage of IOP will
drop by IOP x10Ω from 5V-A.
d. Otherwise replace the optical pick-up.
Check G Sensor
a. Pull the SE-C7 P. W. B. cable out from the connector.
b. Measure the resistance between 3 terminals respectively.
(VSG-GND, GND-5V)
c. The resistance should be 3.7 ± 1MΩ between VSG and GND,
and 94 ± 6kΩ between GND and 5V.
VSG
GND
5V
[MA-C30 BOARD] (SIDE B)
CNJ201
CNJ104
5-2-4-9. Chucking Mechanism
a. Listen the sound from the drive while the drive is spinning up.
b. Check if there is any slipping noise among the Turntable, the
Chucking Pulley Ass'y and the Disc.
c. If you hear any, check the mechanical adjustments (SECTION 4).
d. Otherwise disassemble the drive and check if there is excessive
dust or any contamination on the Turntable or the disc.
Note: As the CD-56 adopts the VCAN (Vibration Cancel) motor
for the spindle motor, clattering sounds of the ball bearings
are produced during spinning up and spinning down.
Differentiate these from slipping sounds.
5-2-4-10. Sled Motor
a. Disconnect the SE-C7 P. W. B. cable from the SE-C7 board.
b. Check the resistance between 2 terminals of sled motor.
c. It should be 10.8Ω ± 10%.
TP IOP
Laser Current Check
CNJ103
CNJ102
IC106
IC104
49