Philips-MCB-275-Service-Manual电路原理图.pdf

CLASS 1LASER PRODUCTMCB275/05©Copyright 2009 Philips Consumer Electronics B.V. Eindhoven, The NetherlandsAll rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of Philips.Published by SL0913 Service Audio Printed in The Netherlands Subject to modifi catiGB 3141 785 31774Micro SystemTABLE OF CONTENTSPageLocation of PC Boards & Versions Variation .1-2Specifi cations .1-3Measurement Setup .1-4Service Aids, Safety Instruction, etc .1-5CD Playability Check .1-6 to 1-8Disassembly Instructions & Service positions . 2Service Test Program .3-1Set Block Diagram .4-1Set Wiring Diagram .5-1Main Board . 6Key & LCD Board . 7CD & MCU Board . 8Mechanical Exploded View & Parts List . 9Revision list . 10Version 1.41-2xni RDC / ni xuALine OutVideo OutSurround OutSubwoofer OutPower Booster OutDigital OutDigital inMatrix SurroundxSDRxsweNDolby Pro Logic (DPL)Incredible SurroundKaraoke FeaturesVoltage SelectorECO Power Standby (LCD Display Off) xECO6 Tuner Board - Systems Non-CenelecxECO6 Tuner Board - Systems CenelecUSB DirectVERSION VARIATIONS:Type /Versions: MCB275 Features &Board in used:/05xVERSION VARIATIONS1-3SPECIFICATIONSGENERAL:Mains voltage : 127/240V -15%+10% Switchable for /98120V ± 10% for /37230V ± 10% for /05/12Mains frequency : 50/60HzClock accuracy : 25dBImage rejection : > 25dB > 75dBDistortion at RF=1mV, dev. 75kHz : 18dBMWTuning range : 531-1602kHz for /05/12/55/98530-1700kHz for /37/98Grid : 9kHz for /05/12/55/9810kHz for /37/98IF frequency : 450kHz ± 1kHzAerial input : Frame aerial 18.1µHSensitivity at 26dB S/N : 18dBIF rejection : > 45dBImage rejection : > 28dBDistortion at RF=50mV, M=80% : 76dBDistortion at 1kHz : 30dBEmphasis : 15/50 µS (switchedautomatically by CD10)THD Noise(1kHz,500mW) : 60B > 80dB:2 x 4.5W (4, 1kHz, 10% THD) /98:2 x 4.5W (FTC Power, 4, 1kHz, 10% THD 63Hz-12.5kHz) /37Dynamic Bass Boost (DBB) : ON / OFFUSB : HostSignal/Noise ratio (unw.) : > 65dBVolume attenuation(1kHz) : > 60dBID3 : V1 tag/V2 2.0/V2 3.0MP3 CD WMA:MP3 : MPEG 1 (ISO/IEC 11172-3)Layer3Language Support : English1-4LF Generator e.g. PM5110RecorderUse Universal Test Cassette CrO2 SBC419 4822 397 30069LEVEL METERe.g. Sennheiser UPM550with FF-filterS/N and distortion metee.g. Sound Technology ST1700BLRDUTor Universal Test Cassette Fe SBC420 4822 397 30071LEVEL METERe.g. Sennheiser UPM550with FF-filterS/N and distortion metere.g. Sound Technology ST1700BLRDUTCDUse Audio Signal Disc(replaces test disc 3)SBC429 4822 397 30184Bandpass250Hz-15kHze.g. 7122 707 48001LF Voltmetere.g. PM2534DUTS/N and distortion metere.g. Sound Technology ST1700BFrame aeriale.g. 7122 707 89001Tuner AM (MW,LW)To avoid atmospheric interference all AM-measurements have to be carried out in a Faraday´s cage.Use a bandpass filter (or at least a high pass filter with 250Hz) to eliminate hum (50Hz, 100Hz).RF Generator e.g. PM5326Ri=50Bandpass250Hz-15kHze.g. 7122 707 48001LF Voltmetere.g. PM2534DUTRF Generator e.g. PM5326S/N and distortion metere.g. Sound Technology ST1700BUse a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).Ri=50Tuner FMMEASUREMENT SETUP1-5Service Tools:Universal Torx driver holder .4822 395 91019Torx bit T10 150mm .4822 395 50456Torx driver set T6-T20 .4822 395 50145Torx driver T10 extended .4822 395 50423Compact Disc:SBC426/426A Test disc 5 + 5A .4822 397 30096SBC442 Audio Burn-in test disc 1kHz .4822 397 30155SBC429 Audio Signals disc .4822 397 30184Dolby Pro-logic Test Disc .4822 395 10216SERVICE AIDSGB WARNINGAll ICs and many other semi-conductors aresusceptible to electrostatic discharges (ESD).Careless handling during repair can reduce lifedrastically.When repairing, make sure that you areconnected with the same potential as the massof the set via a wrist wrap with resistance.Keep components and tools also at thispotential.ESDCLASS 1LASER PRODUCTGBSafety regulations require that the set be restored to its originalcondition and that parts which are identical with those specified,be usedSafety components are marked by the symbol !.Lead freeSet remains closed!Standard repair procedureNYPlay a CD for at least 10 minutesYplayabilityok ?Nplayabilityok ?add Info for customer“SET OK“playabilityok ?YNcheck playabilityNYplayabilityok ?check playabilitycheck playabilityEYE-Patternok ?NYcheck “EYE-Pattern“replace CD DriveLaser currentok ?NYcheck Laser currentCD Drive offsetsok ?NYcheck CD Drive offsetsclean the lenscheck playabilityreturn setCustomer complaint“CD related problem“return setreturn setreplace CD Drivereturn setreplace CD Drivereturn setreplace Signal Processorreturn set“fast“ lens cleaning1234567For flap loaders (= access to CD drive possible) cleaning method 4 is recommended1 - 7 For description - see following pagesCD PLAYABILITY CHECK1-61PLAYABILITY CHECKFor sets which are compatible with CD-RW discsuse CD-RW Printed Audio Disc.7104 099 96611TR 3 (Fingerprint)TR 8 (600µ Black dot) maximum at 01:00 playback of these two tracks without audible disturbanceplaying time for: Fingerprint 10secondsBlack dot from 00:50 to 01:10 jump forward/backward (search) within a reasonable timeFor all other sets use CD-DA SBC 444A.4822 397 30245TR 14 (600µ Black dot) maximum at 01:15TR 19 (Fingerprint)TR 10 (1000µ wedge) playback of all these tracks without audible disturbanceplaying time for: 1000µ wedge 10secondsFingerprint 10secondsBlack dot from 01:05 to 01:25 jump forward/backward (search) within a reasonable time2CUSTOMER INFORMATIONIt is proposed to add an addendum sheet to the set whichinforms the customer that the set has been checkedcarefully - but no fault was found.The problem was obviously caused by a scratched, dirty orcopy-protected CD. In case problems remain, the customeris requested to contact the workshop directly. The lens cleaning (method 3) should be mentioned in theaddendum sheet.The final wording in national language as well as the printingis under responsibility of the Regional Service Organizations.3FAST LENS CLEANING (dry brush)Use lens cleaning CDSBC AC300.9082 100 00043Insert the lens cleaning CD, press PLAY and follow thevoice guide´s instructions on the CD.4LIQUID LENS CLEANINGBecause the material of the lens is synthetic and coatedwith a special anti-reflectivity layer, cleaning must be donewith a non-aggressive cleaning fluid. It is advised to use“Cleaning Solvent B4-No2”, available with codenumber4822 389 10026.The actuator is a very precise mechanical component andmay not be damaged in order to guarantee its full function.Clean the lens gently (dont press too hard) with a soft andclean cotton bud moistened with the special lens cleaner.The direction of cleaning must be in the way as indicated inthe picture below.Before touching the lens it is advised to clean thesurface of the lens by blowing clean air over it.This to avoid that little particles make scratches onthe lens.CD PLAYABILITY CHECK1-75EYE-PATTERN SIGNAL JITTER MEASUREMENTMeasure the signal on the input of the Signal processorusing an analog oscilloscope. Please find the exactmeasuring point in your Service Manual.See below examples of the signal. Amplitude should read atleast 700mVpp using SBC444A.goodbadIf the oscilloscope shows a signal like the bad one, and/orthe amplitude decreases within 1 minute - the CD drive hasto be replaced.6CD DRIVE LASER CURRENT MEASUREMENTThe laser current can be measured as a voltage drop on aresistor. The resistor is marked in every Service Manual.The value depends on the type of CD drive.typical value most probably defectVAMxxxx : 150-230mV 350mVMCDxx : 170-230mV 300mVDA1x : 210-250mV 350mVDA2x : 175-200mV 250mVUse SBC444A (CD-DA) for measurement.7CD DRIVE OFFSET MEASUREMENTThe photodiodes of the CD-drive may have an offset. Theseoffsets have to be compensated by the signal processor.High offsets can lead to poor playability of some CDs(skipping tracks).To measure the offset values, start the Service TestProgram - section “Focus Test” without a CD.The offsets can be measured with a DC Millivoltmeterdirectly on the connector (see drawing below). Pinnumbering varies from drive to drive.The values from diode A-D should read 0±10mV.Diodes E and F are less critical.If one of the offsets is higher than ±10mV the CD drive hasto be replaced. Otherwise replace the Signal Processor.Sanyo DA12T3CD DriveAAFCBECDEVCCBVREFFD9101112131415161800+5V_HFVrefCD10ADEBCFGND 8EDABCFLaser power control100n2878470n287638211R1K3823288033p+5VBC807-407879381747R38204R747R38191n28792877 47u1847811-ALM358D3210K382247R38182841 100n47n2869+5V_HFLASER DIODEU >250mV->Laser damaged !4,6V3V3,3V3,9V2V0,17V0,17VSanyoDA12T3HF-AmplifierD3D2D1Drive detection680R390539033K3BC847B787747n28181K53902574216364891011470R3893+3.3V2K23908 10K3923BC847B7878BC847B78764n728133896100R220u28852881560p47n2887560R39012883470n28174u73n328143898220R389527K470n2884+3.3V3909820R3907100R392033K3897288282p3K339042K738993906470R+5V_HFHFINVrefCD10100p2815281622nLDONto 3826,3827VREF GEVDDA1VRINVSSA1ISLICELDOND1D2D3D4HFINHFREFIREFCD_DA: 0V / CD_RW: 3V (A-D)800mVppTB = 0.5µs/divEYE-PATTERN1,8V1,2V2,4V2,6V0,65VCD PLAYABILITY CHECK1-82-1 2-1DISMANTLING INSTRUCTIONS1) Press the 2 juts and pull out the Stand as shown in figure1.2) Loosen 5 screws A and 6 screws B to remove the RearCabinet as shown in figure 2.3) Loosen 3 screws C to remove the SP & ANT Jack Boardas shown in figure 3.4) Loosen 5 screws D to remove the Power Module asshown in figure 3.Dismantling the Rear Portion and PCBsFigure 3Figure 2Dismantling the Rear Portion and PCBs5) Loosen 2 screws E to remove the Bracket Jack Board asshown in Figure 4.6) Loosen 3 screws F to remove the Main Board as shownin figure 5.Figure 4Figure 5Figure 1Dismantling of the Display Lens & the Volume knob1) Use a flat head screw driver to give a push in the directionas shown in figure 6.Figure 62) Place two small screw drivers in between the front cabinet& knob to give more leverage in pulling out the VolumeKnob as shown in figure 7.Figure 72-2 2-2Service pos ANote: After re-assembly, it is very important to ensure allwires are routed properly to ensure that they do nottouch/obstruct all moving parts.Dismantling of the CD Module & CD Door Carrier1) Loosen 5 screws J mounting the Key Board to the FrontCabinet to remove the Key Board as shown in figure 8.2) Loosen 4 screws H and 3 screws G to CD Module asshown in figure 8.3) Loosen 2 screws I to remove the Servo Motor Mechanismas shown in figure 8.Figure 84) Loosen 4 screws K to remove the Right CD Door Carrierand 4 screws L to remove the Left CD Door Carrier asshown in figure 9.Figure 9Service pos B