Sony DVP-NW50 Service Manual

Also see for DVP-NW50 - In-wall Dvd Player: User manual Installation User manual Installer manual Installer manual

Contents

20DVP-NW50DVD SECTIONAUTO SERVO ADJUSTMENTAfter parts related to the servo circuit (RF amplifier , servo control(U2), motor driver (U4), EEPROM (U6) so on) are replaced, re-adjusting the servo circuit is necessary.1. RFOP Level /RF Waveform Check[TEST DISC]Use the following test disc on test mode.TDV-520CSO (DVD-V SL) : Part No. J-2501-236-APATD-012 (CD) : Part No. 4-225-203-01TCD-W082L (CD-RW) : Part No. J-2502-063-2TDV-540C (DVD DL) : Part No. J-2501-235-AConnection:Procedure:1. Connect an oscilloscope to TP18 (RFOP) and GND on theDVD SERVO board.2. Turn the power on.3. Set the test disc on the tray and press H button to playbackthe number two track.4. Confirm that oscilloscope waveform is clear and check RFACsignal level is correct or not.Note: A clear RFAC signal waveform means that the shape “◊” can beclearly distinguished at the center of the waveform.5. Procedure 4 is repeatedly confirmed from procedure 1 witheach TEST DISC.Note: TEST DISC (TDV-540CSO), playback the number thirty two track,too.SECTION 5ELECTRICAL ADJSTMENTS+–TP18 (RFOP)GNDoscilloscopeDVD SERVO boardRFAC signal waveform VOLT/DIV: 200 mVTIME/DIV: 500 nslevel: 0.9 ±0.25 Vp-p2. Iop (CD) Check[TEST DISC]PATD-012(CD) :Part No. 4-225-203-01Connection:Procedure:1. Connect an digital voltmeter across R38 (10 Ω) on the DVDSERVO board.2. Turn the power on.3. Put the test disc (PATD-012) into playback the number twotrack.4. Measure the voltage across R38 (10 Ω) on the DVD SERVOboard.5. Confirm the Iop value is less than 75 mA.Iop value (mA) = The voltage across R38 (10 Ω)/10 Ω3. Iop (DVD) Check[TEST DISC]TDV-520SCO (DVD) :Part No. J-2501-236-AConnection:Procedure:1. Take note of the Iop value that is printed in the bottom of thelabel on the rear of the optical pick up.[D***C***] The last three digits after the character “D”indicates the Iop value.2. Connect an digital voltmeter across R37 (10 Ω) on the DVDSERVO board3. Turn the power on.4. Put the test disc (TDV-520SCO) into playback the numbertwo track.5. Measure the voltage across R37 (10 Ω) on the DVD SERVOboard.6. Confirm that the measured value is within specified range of± 4 mA.Iop value (mA) = The voltage across R37 (10 Ω)/10 Ωdigital voltmeterR38DVD SERVO board+–digital voltmeterR37+–digital voltmeterDVD SERVO board51.9 mAIDP200A1154181D519C674