Sony RCD-W3 Service Manual page 18

RCD-W3
Description of each parameter
VRDC: Used on the Read Power setting in case of reading CD-RW and CD-R. (DAC value on 100mW.)
VWDC: There is VWDC1 (Write power) pin in the optical pick-up block. The recording power is set by it and VWDC2
(Over drive) pin. Used on setting VWDC1 pin power on recording. (Unit: DAC value/10mW)
VWDC2: Used on setting VWDC2 (Over drive) pin power on recording. (Unit: DAC value/5mW)
VWDC2 Offset: Used on setting VWDC2 (Over drive) pin power with VWDC2 parameter on recording. (Unit: DAC value)
Specification of each parameter
20<read power<200
100<write power<2000
30<VRDC<150
48<VWDC1<150
50<VWDC2<145
VWDC2 Offset<35
Procedure:
1. Eject a disc from CD-R.
2. Select "Laser Power Setup" on "LD Inspection" pull-down
menu, then "Laser Power Setup (Manual)" window is open.
3. Click VRDC, then Pick-up moves outward and LD turns on.
4. Measure the LD power with a LD power meter. Write its value
to the blank of "Read Power" column.
(Write a value to two decimal places. Ex: Write "93" in case of
0.93mW.)
5. Click VWDC1, then LD turns on.
6. Measure the LD power with a LD power meter. Write its value
to the blank of "Write Power" column.
(Write a value to two decimal places. Ex: Write "1234" in case
of 12.34mW.)
7. Click LD Off to turn LD off.
8. Click Setup, then setting is over and a result is displayed.
("OK"/"NG" is displayed for every items.)
9. Click X to close "Laser Power Setup (Manual)" window.
Adjustment Data Check
Check if the error has occurred on reading "CD-R LD POWER SETTING" value.
Procedure:
1. Select "Calibration" on "Calibration" pull-down menu, then "Read Calibration Results" window is open.
2. Click Read, then the calibration data are displayed.
3. Data specification
CD-R VRDC DAC: 30-150
VWDC1: 48-150
VWDC2: 50-145
VWDC2 Offset: 0-35
4. Click X to close "Read Calibration Results" window.
Fig 7 : Calibration menu windows
18
Fig 5 : LD inspection menu windows
Fig 6 : Laser power setup window
Fig 8 : Read calibration results window