Philips-MCD-988-Service-Manual电路原理图.pdf

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1、Version 1.2MCD9883141 785 31962DVD Micro theatreall versionsPublished by LX 0821 Service Audio Subject to modification Copyright 2007 Philips Consumer Electronics B.V. Eindhoven, The NetherlandsAll rights reserved. No part of this publication may be reproduced, stored in a retrievalsystem or transmi

2、tted, in any form or by any means, electronic, mechanical, photocopying,or otherwise without the prior permission of Philips.Service Aids .1-1CD Playability Check .1-2.1-4Technical specification .2-1Service tools .2-1Service measurement setup .2-2Disassembly diagram.3-1.3-2Software version check and

3、 upgrading .4-1Block diagram .5-1Wiring diagram .6-1VFD Board circuit diagram .7-1 layout diagram .7-2AMP Board (in subwoofer box)circuit diagram .8-1layout diagram .8-2.8-3CPU & Tuner Board circuit diagram. .9-1layout diagram .9-2.9-3Power Board (in subwoofer box)circuit diagram. .10-1.10-2layout d

4、iagram .10-3DVD MPEG Boardcircuit diagram. .11-1.11-3layout diagram .11-4Exploded view diagram .12-1Mechanical partslist .12-2Electrical partslist.13-1.13-3Packing exploded view (-/93).14-1.14-2TABLE OF CONTENTS1-1Service Tools:Universal Torx driver holder .4822 395 91019Torx bit T10 150mm .4822 395

5、 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

6、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

7、 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

8、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 offsetsclea

9、n 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 d

10、escription - see following pagesCD PLAYABILITY CHECK1-21PLAYABILITY CHECKFor sets which are compatible with CD-RW discsuse CD-RW Printed Audio Disc.7104 099 96611TR 3 (Fingerprint)TR 8 (600 Black dot) maximum at 01:00 playback of these two tracks without audible disturbanceplaying time for: Fingerpr

11、int 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 (600 Black dot) maximum at 01:15TR 19 (Fingerprint)TR 10 (1000 wedge) playback of all these tracks without audible disturbanceplaying time for:

12、1000 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

13、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 responsibil

14、ity 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 guides instructions on the CD.4LIQUID LENS CLEANINGBecause the material of the lens is synthetic and coatedwith a special a

15、nti-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 g

16、ently (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 lit

17、tle particles make scratches onthe lens.CD PLAYABILITY CHECK1-35EYE-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 rea

18、d 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 ev

19、ery 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 offse

20、t. 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 co

21、nnector (see drawing below). Pinnumbering varies from drive to drive.The values from diode A-D should read 010mV.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 DriveAAFCBECDEVCCBVREFFD91

22、01112131415161800+5V_HFVrefCD10ADEBCFGND 8EDABCFLaser power control100n2878470n287638211R1K3823288033p+5VBC807-407879381747R38204R747R38191n28792877 47u1847811-ALM358D3210K382247R38182841 100n47n2869+5V_HFLASER DIODEU 250mV-Laser damaged !4,6V3V3,3V3,9V2V0,17V0,17VSanyoDA12T3HF-AmplifierD3D2D1Drive

23、detection680R390539033K3BC847B787747n28181K53902574216364891011470R3893+3.3V2K23908 10K3923BC847B7878BC847B78764n728133896100R220u28852881560p47n2887560R39012883470n28174u73n328143898220R389527K470n2884+3.3V3909820R3907100R392033K3897288282p3K339042K738993906470R+5V_HFHFINVrefCD10100p2815281622nLDON

24、to 3826,3827VREF GEVDDA1VRINVSSA1ISLICELDOND1D2D3D4HFINHFREFIREFCD_DA: 0V / CD_RW: 3V (A-D)800mVppTB = 0.5s/divEYE-PATTERN1,8V1,2V2,4V2,6V0,65VCD PLAYABILITY CHECK1-42 - 1TECHNICAL SPECIFICATIONSSYSTEMTotal output power . 400W RMSPower supply . 220 240 V / 50 HzRated working power consumption (1/8 r

25、atedoutput power) .) 85WAUX input sensitivity . ) 500mVChannel Separation .* 40dBDistortion . 0.7%Eco power Standby. 1WDVDFrequency response 100Hz-20kHz (+0.5/-2 dB)Video output .1 VP-PHDMI 480p (60Hz), 720p (60Hz), 1080i (60Hz),576p (50Hz), 720p (50Hz), 1080i (50Hz)Horizontal definition. 500 (TV)Di

26、mensions . 430 (W) x 225 (H) x 141 (D) mmWeight . 2.13 kgAMPLIFIERRated output power (THD = 10%) . 2x75W (41)Frequency response 100Hz-20kHz (+0.5/-2 dB)S/N Ratio . * 60dBLoaded impedance . 4 1TUNERFM Frequency range. 87.5-108 MHzFM Noise limit sensitivity . ) 20V/MFM S/N .* 46dBSpecificationsSPEAKER

27、Impedance. 4 1Output power . 75WSensitivity . 80 4dBFrequency response . 80Hz-16kHzDimensions . 198 (W) x 649 (H) x 163 (D) mmWeight . 3.66 kg eachSUBWOOFERSubwoofer (not magnetically shielded design). 8” (active)Impedance. 8 1Dimensions . 430 (W) x 265 (H) x 292 (D) mmWeight . 8.6 kgOutput power .

28、150WREMOTEDistance . 6mAngle . 300Specifications subject to change withoutprior notice2 - 2SERVICE MEASUREMENTBandpass250Hz-15kHze.g. 7122 707 48001LF Voltmetere.g. PM2534DUTRF Generator e.g. PM5326S/N and distortion metere.g. Sound Technology ST1700BTuner FWUse a bandpass filter to eliminate hum (5

29、0Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).Ri=50Bandpass250Hz-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 carr

30、ied out in a Faradays cage.Use a bandpass filter (or at least a high pass filter with 250kHz) to eliminate hum (50Hz, 100Hz).RF Generator e.g. PM5326Ri=50LRLEVEL METERe.g. Sennheiser UPM550with FF-filterS/N and distortion metere.g. Sound Technology ST1700BDUTCD RECORDERUse Audio Signal Disc SBC429 4

31、822 397 30184(replaces test disc 3)Use Universal Test Cassette Fe SBC420 4822 397 30071LRLEVEL METERe.g. Sennheiser UPM550with FF-filterS/N and distortion metere.g. Sound Technology ST1700BDUTLF Generator e.g. PM5110Ri=50Disassembly diagram A Remove Bottom Cover C Remove DVD Decoder and CPU board As

32、sy A1. Remove Screws M312（12PCS ） C1. Remove Screws M3 8 （6PCS ） C A B. Remove Fan-out Screws （4PCS ） D Cut Plastic Wires (3PCS) B DE Remove Motor G Remove CD Mechanism E1 Remove Screws M36 （6PCS ） G1 Remove Screws M2.6 10（8PCS ） GE F Remove PCB Plank H Remove Main Panel F1 Remove Screws M36 （2PCS ） H1 Remove Screws M3 6 （14PCS ） F I Remove VFD Board Assy K Remove USB board I1 Remove Screws M2.68 （10PCS ） K1 Remove Screws M3 10（2PCS ） KIL Remove Decorate Lamp J Remove Slide Plank and Slide Spring L1 Remove Screws M28 （1PCS ） LJ