Sony MDS-JE470 Service Manual - Page 32

MDS-JE470 7. Then, rotate the l AMS L knob and display "LDPWR CHECK". 8. Press the YES button once and display "LD 0.9 mW $ ". Check that the reading of the laser power meter become the specified value. 9. Press the YES button once more and display "LD 7.0 mW $ ". Check that the reading the laser power meter and digital volt meter satisfy the specified value. Note down the digital voltmeter reading value. Specified Value : Laser power meter reading : LD 0.9mW : 0.85-0.91mW (260B) 0.90-0.96mW (260E) LD 7.0mW : 6.90-7.10mW (260B) 7.20-7.30mW (260E) Digital voltmeter reading : Optical pick-up displayed value ± 10% (Optical pick-up label) KMS260B 20101 H0576 R (For details of the method for checking this value, refer to "5-8. Recording and Displaying IOP Information".) Iop = 57.6 mA in this case Iop (mA) = Digital voltmeter reading (mV)/1 (Ω) 10. Press the MENU/NO button and display "LDPWR CHECK" and stop the laser emission. (The MENU/NO button is effective at all times to stop the laser emission.) 11. Rotate the l AMS L knob to display "Iop.Write". 12. Press the YES button. When the display becomes Ref = @@@ .@ (@ is an arbitrary number), press the YES button to display "Measu=@@@.@" (@ is an arbitrary number). 13. The numbers which can be changed will blink. Input the Iop value noted down at step 9. To select the number : Rotate the l AMS L knob. To select the digit : Press the l AMS L knob 14. When the YES button is pressed, "Complete!" will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become "Iop Write". Note 1: After step 4, each time the YES button is pressed, the display will be switched between "LD 0.7 mW $ ", "LD 6.2 mW $ ", and "LD Wp $ ". Nothing needs to be performed here. 5-11. Iop NV SAVE Write the reference values in the nonvolatile memory to perform "Iop compare". As this involves rewriting the reference values, do not perform this procedure except when adjusting the laser power during replacement of the OP and when replacing the IC102. Otherwise the OP check may deteriorate. Note: Perform this function with the optical pick-up set at room temperature. Procedure 1. Rotate the l AMS L knob to display "Iop NV Save" (C06). 2. Press the YES button and display "Iop [stop]". 3. After the display changes to "Iop =xxsave?", press the YES button. 4. After "Complete!" is displayed momentarily, the display changes to "Iop 7.0 mW". 5. After the display changes to "Iop=yysave?", press the YES button. 6. When "Complete!" is displayed, it means that Iop NV saving has been completed. 32 5-12. TRAVERSE ADJUSTMENT Connection : Oscilloscope BD board CN105 pin 4 (TE) CN105 pin 6 (VC) V : 0.5 V/div H : 10 ms/div Input : DC mode Adjusting Procedure : 1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105 pin 6 (VC) of the BD board. 2. Load a test disc (MDW-74/GA-1). (Refer to Note 1.) 3. Press the M button and move the optical pick-up outside the pit. 4. Rotate the l AMS L knob and display "EF MO AD- JUST". 5. Press the YES button and display "EFB = MO-R". (Laser power READ power/Focus servo ON/tracking servo OFF/ spindle (S) servo ON) 6. Rotate the l AMS L knob so that the waveform of the oscilloscope becomes the specified value. (When the l AMS L knob is rotated, the of "EFB= " changes and the waveform changes.) In this adjustment, waveform varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible. (Read power traverse adjustment) (Traverse Waveform) A VC B Specification A = B 7. Press the YES button and save the result of adjustment to the non-volatile memory ("EFB = SAVE" will be displayed for a moment. Then "EFB = MO-W" will be displayed). 8. Rotate the l AMS L knob so that the waveform of the oscilloscope becomes the specified value. (When the l AMS L knob is rotated, the of "EFBMO-W" changes and the waveform changes.) In this adjustment, waveform varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible. (Write power traverse adjustment) (Traverse Waveform) A VC B Specification A = B 9. Press the YES button, and save the adjustment results in the non-volatile memory. ("EFB = SAVE" will be displayed for a moment.) 10. "EFB = MO-P". will be displayed. The optical pick-up moves to the pit area automatically and servo is imposed.