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Rf Level (Laser Power) And Laser Current; Special Tools And Measuring Equipment; Measurement - Sony CDU31A Series Service Manual

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5-2 RF LEVEL (LASER POWER) AND LASER
CURRENT
Disassemble the following parts and then perfonn the
measurement.
a.
Bottom Plate Ass'y (Refer to 4-2)
5-2-1 Special Tools and Measuring Equipment
a.
IBM PS/2 System
b.
SRV SLCD Disk
c.
BNC (one end) Cable (2pcs)
d.
Oscilloscope
e.
Fixture CD I
5-2-2 Measurement
a.
Connect the drive to DC power supply.
Note:
Make sure tum•off the power of DC power supply.
b.
Tum on the power supply.
c.
Insert the Test Disc (YEDS-18) to the test drive.
d.
Connect the CH-I probe of oscilloscope to RFO
tenninal on fixture CD! and GND.
Note:
Set the oscilloscope as below
Display: CH-I
I
AC mode
Range:
0.2V/div. 500ns/div.
Trigger: AUTO mode
e.
Select Play TNO by hitting the IFIOI key in Test Mode
menu.
f.
Select No. 18 with arrow key, then hit !Enter! key.
g.
Check if the RF Level (Laser Power) satisfy the 1.2 V
±
0.3 Vp-p (Refer to Fig. 5-1-6 (b)). If the RF level
is less than 900m V, perfonn optics cleaning. (Refer to
5-3) After optical device cleaning, the level should
meet specification. If not, replace the Optical Device.
5-7

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