Sony HCD-MDX10 Service Manual - Page 29
CHECKS PRIOR TO REPAIRS, 6-1. Temperature Compensation Offset Check, 6-2. Laser Power Check - specifications
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7-6. CHECKS PRIOR TO REPAIRS These checks are performed before replacing parts according to "approximate specifications" to determine the faulty locations. For details, refer to "Checks Prior to Parts Replacement and Adjustments" (See page 11). 7-6-1. Temperature Compensation Offset Check When performing adjustments, set the internal temperature and room temperature to 22 to 28°C. Checking Procedure: 1. Rotate the AMS dial to display "TEMP CHECK". 2. Press the ENTER/YES button. 3. "T=@@(##) OK" should be displayed. If "T=@@ (##) NG" is displayed, it means that the results are bad. (@@ indicates the current value set, and ## indicates the value written in the non-volatile memory.) 7-6-2. Laser Power Check Before checking, check the IOP value of the optical pick-up. (Refer to 7-8. Recording and Displaying IOP Information.) Connection : Laser power meter Optical pick-up objective lens Digital volt meter Note 1: After step 4, each time the ENTER/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. 7-6-3. Traverse Check Connection : Oscilloscope BD board CN110 pin 3 (TE) CN110 pin 1 (VC) V : 0.5 V/div H : 10 ms/div Input : DC mode Checking Procedure: 1. Connect an oscilloscope to CN110 pin 3 (TE) and CN110 pin 1 (VC) of the BD board. 2. Load a disc (any available on the market). (Refer to Note 1.) 3. Press the p button and display the "MD", and then press the ) button and move the optical pick-up outside the pit. 4. Rotate the AMS dial and display "EF MO CHECK"(C03). 5. Press the ENTER/YES button and display "EFB = MO-R". (Laser power READ power/Focus servo ON/tracking servo OFF/ spindle (S) servo ON) 6. Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the AMS dial. (Read power traverse checking) (Traverse Waveform) BD board A CN110 pin 5 (I+3V) CN110 pin 4 (IOP) VC B Checking Procedure: 1. Set the laser power meter on the objective lens of the optical pick-up. (When it cannot be set properly, press the p button and display the "MD", and then press the 0 button or ) button to move the optical pick-up.) Connect the digital volt meter to CN110 pin 5 (I+3V) and CN110 pin 4 (IOP). 2. Then, rotate the AMS dial and display "LDPWR CHECK" (C02). 3. Press the ENTER/YES button once and display "LD 0.9 mW $ ". Check that the reading of the laser power meter become 0.84 to 0.92 mW. 4. Press the ENTER/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. Specified value : Below 10% offset value Offset value (%) = IA - BI X 100 2 (A + B) 7. Press the ENTER/YES button and display "EFB = MO-W". 8. Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the AMS dial. (Write power traverse checking) (Traverse Waveform) A VC Specified Value : Laser power meter reading : 7.0 ± 0.2 mW Digital voltmeter reading : Optical pick-up displayed value ± 10% (Optical pick-up label) KMS260A 27X40 B0825 (For details of the method for checking this value, refer to "7-8. Recording and Displaying IOP Information".) B Specified value : Below 10% offset value Offset value (%) = IA - BI X 100 2 (A + B) 9. Press the ENTER/YES button display "EFB = MO-P". Then, the optical pick-up moves to the pit area automatically and servo is imposed. N Iop = 82.5 mA in this case Iop (mA) = Digital voltmeter reading (mV)/1 (Ω) 5. 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.) - 29 -