Sony RCD-W1 Service Manual page 17

CD-R LD Setting Check
(VRDC/VWDC/FPD Level Value Check)
This routine is for checking performances of the record/playback D-A converter (IC409), RFIC (IC413), the encoder/decoder IC
(IC401), CPLD (IC601), the optical pick-up block (KRS-220C), the microcomputer(IC701) and so on.
It diagnoses malfunctions of interface, the pick-up or so on.
It diagnoses the circuit in the recording mode without disc.
Description of each item
OFF LEVEL: In case of the laser turns off, FPDO output is 3V. Sampling value at this time.
VRDC LEVEL: APC circuit VRDC signal sampling value after READ power setting.
VRDC FPD: Optical pick-up FPDO signal sampling value after READ power setting.
VWDC1 LEVEL:APC circuit VWDC signal sampling value after setting WRITE power to regular value.
VWDC1 FPD: Optical pick-up FPDO signal sampling value after setting WRITE power to regular value.
VWDC2-1 FPD: There are two types of characteristics because of a non-linearity period of laser diode in the
over drive portion. This is FPDO sampling value in case of setting one of them to VWDC2 value.
VWDC2-2 FPD: FPDO sampling value in case of setting the other to VWDC2 value.
Specification of each item
38400-3300<OFF_LEVEL<38400+3300 (3.0±0.25V)
10<VRDC_LEVEL<20000
880<VRDC_FPD<1320
2000<VWDC1_LEVEL<25000
8640<VWDC1_FPD<12960
10<VWDC2-1_FPD<9500
2000<VWDC2-2_FPD<16000
Procedure:
1. Eject a disc from CD-R.
2. Select "Laser Inspection" on "LD Inspection" pull-down menu, then "Laser Power Test" window is open.
3. Click Trigger to execute LD check.
4. LD checked results are displayed.
("OK"/"NG" is displayed for every items.)
5. Click X to close "Laser Power Test" window.
Fig 3 : LD inspection menu windows
Fig 4 : Laser power test window
RCD-W1
17