Philips-DCM-276-Service-Manual电路原理图.pdf

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1、Version 1.1DCM2763141 785 34201Micro Hi-Fi System-/05/55Published by LX 0951 Service Audio Subject to modification Copyright 2009 Philips Consumer Electronics B.V. Eindhoven, The NetherlandsAll rights reserved. No part of this publication may be reproduced, stored in a retrievalsystem or transmitted

2、, in any form or by any means, electronic, mechanical, photocopying,or otherwise without the prior permission of Philips.CONTENTSTechnical specification .1-2Service measurement setup.1-3Service aids .1-4Instructions on CD playability .2-1.2-2Block diagram.3-1Wiring diagram.4-1 Disassembly diagram. .

3、5-1Main boardCircuit diagram .6-1.6-5 Layout diagram .6-6.6-7MCU boardCircuit diagram .7-1 Layout diagram .7-2.7-3Display & Key boardCircuit diagram .8-1 Layout diagram .8-2.8-3Power boardCircuit diagram .9-1Layout diagram .9-2Ipod Jack & SW boardCircuit diagram .10-1Layout diagram .11-1Exploded vie

4、w diagram .12-1Mechanical parts list .12-2Electrical parts list.13-1.13-2AmplierTotal output power 2 x 5 W RMSFrequencyresponse125 Hz - 16 kHz, 3 dBSignal to noise ratio 60 dBMP3 link input 0.5 V RMS 20 k DiscLaser type SemiconductorDisc diameter 12 cm /8 cmSupport disc CD-DA, CD-R, CD-RW,MP3-CD, WM

5、A-CDAudio DAC 24 Bits / 44.1 kHzTotal harmonicdistortion75 dBATunerTuning range FM: 87.5 - 108 MHzTuning grid 50 KHzNumber of presets 20SpeakersSpeaker driver 4” wooferSpeaker impedance 5 W, 3General informationAC power 230-240 V, 50 HzOperation PowerConsumption25 WStandby PowerConsumption 2 WEco Po

6、wer StandbyPower Consumption 1 WUSB Direct Version 2.0/1.1Dimensions- Main Unit(W x H x D)542 x 238 x 102 mmWeight- Main Unit3.935 kgTECHNICAL SPECIFICATION1 - 2Type /Versions:FeaturesBoard in used:DCM 276Service policyDISPLAY BOARDMAIN BOARDPOWER BOARDKEY BOARD* TIPS : C - Component Lever Repair.M

7、- Module Lever Repair- Used/05 /12 /5589/16/85/Feature diffrenceRDSVOLTAGE SELECTORECO STANDBY - DARKCCType /Versions:DCM 276/05 /12 /5589/16/85/CCVERSION VARIATION39/39/MCU BOARDIPOD JACK BOARDSW BOARDCCCCC&MC&MCC&MCC1-3LF Generator e.g. PM5110RecorderUse Universal Test Cassette CrO2 SBC419 4822 39

8、7 30069LEVEL METERe.g. Sennheiser UPM550with FF-filterS/N and distortion metee.g. Sound Technology ST170LRDUTor 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 te

9、st 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 Faradays cage.Use a ban

10、dpass filter (or at least a high pass filter with 250Hz) to eliminate hum (50Hz, 100Hz).RF Generator e.g. PM5326Ri=50:Bandpass250Hz-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 (5

11、0Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).Ri=50:Tuner FMMEASUREMENT SETUP1-4SERVICE 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

12、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

13、 usedSafety components are marked by the symbol!.Lead freeSet remains closed!NYPlay a CD for at least 10 minutesYplayabilityok ?Nplayabilityok ?add Info for customer“SET OK“check playabilityNYplayabilityok ?check playabilitycheck playabilityreturn setCustomer complaint“CD related problem“fast“ lens

14、cleaning123For flap loaders (= access to CD drive possible)cleaning method 4 is recommendedINSTRUCTIONS ON CD PLAYABILITY2 - 1Exchange CDM1 - 4 For description - see following pages1PLAYABILITY CHECKFor sets which are compatible with CD-RW discsuse CD-RW Printed Audio Disc.7104 099 96611TR 3 (Finger

15、print)TR 8 (600 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 (600 Black dot) ma

16、ximum at 01:15TR 19 (Fingerprint)TR 10 (1000 wedge) playback of all these tracks without audible disturbanceplaying time for: 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 ad

17、dendum 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

18、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.4LIQUID LENS CLEANINGBecause the material of the lens is synthetic and coatedwith a special anti-reflectivity layer, cleaning must b

19、e donewith a non-aggressive cleaning fluid. It is advised to use“Cleaning Solvent 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 l

20、ens 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.INSTRUCTIONS ON CD PLAYABILITY2 - 2SET BLOCK DIA

21、GRAM3-1SET WIRING DIAGRAM4-1MCU PCBMCUPCB5-1 5-1DISASSEMBLY DIAGRAMDismantling of the Rear CabinetDismantling of the PCB BoardBCRIGHT SPEAKER CAB.LEFT SPEAKER CAB.REAR CABINET.DEFG1)Remove 5 screws D as indicated to loosen the Main Board.2)Remove 2 screws E as indicated to loosen the Key Board.3)Rem

22、ove 5 screws F as indicated to loosen the Display Board.4)Remove 2 screws G as indicated to loosen the Power Board.1)Remove 8 screws A as indicated to loosen the speaker cabinet.2)Remove 4 screws B as indicated.3)Remove the rubber foot as indicated.4)Remove 2 screws C as indicated to loosen the Rear cabinet.A6-1 6-1CIRCUIT DIAGRAM - MAIN BOARDPART 1