Philips-MCB-279-Service-Manual电路原理图.pdf
MCB279/05©Copyright 2008 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 SL 0821 Service Audio Printed in The Netherlands Subject to modificationDAB Micro SystemVersion 1.0CLASS 1LASER PRODUCT© 3141 785 32860TABLE OF CONTENTSPagePCBs Location & Version Variations .1-2Specifi cations .1-3Measurement Setup .1-4Service Aids, Safety Instruction, etc .1-5 to 1-7Software Version Checking . 2Set Block Diagram . 3Set Wiring Diagram . 4Main Board . 5MCU Board . 6Key Board . 7Power AMP Board . 8CD Board . 9Headphone & Motor & Door Switch Board . 10Set Mechanical Exploded View & Parts List . 11/12 /58niRDC/nixuALine OutVideo OutSubwoofer OutDigital OutKaraoke FeaturesVoltage SelectorECO Power Standby (LCD Display Off)USB DirectType /Versions: MCB279 Featuresin used:/05VERSION VARIATIONSType /Versions:Board in used:MCB279Service policyMAIN BOARDCD BOARDPOWER AMP BOARDHEADPHONE BOARD* TIPS : C - Component Lever Repair.M - Module Lever Repair- UsedC/12 /05 8559/16/85/Feature diffrenceKEY BOARDCCCDAB MODULE Mxxx1 - 2PCBS LOCATIONMOTOR BOARD CCMCU BOARD CxCD BOARDHEADPHONE BOARDKEY BOARDMOTOR BOARDPOWER AMP BOARDMCU BOARDMAIN BOARD1 - 3AMPLIFIEROutput power . 30 W RMSSignal-to-noise ratio . t 65 dBAFrequency response . 100 18kHz, ± 3 dBInput sensitivity AUX . 0.5 V (max. 1 V)Impedance loudspeakers .t 6 :Impedance headphones . 32 : -1000 :. <15 mWCD PLAYERFrequency range . 100 18 kHzSignal-to-noise ratio . 65 dBATUNERFM wave range . 87.5 108 MHzMW wave range . 531 1602 kHzNumber of presets . 40AntennaFM. 75 : wireSPEAKERSBass reflex systemDimensions (w x h x d) . 158 x 250x 185 (mm)GENERAL INFORMATIONAC Power .110 240 V, 50 Hz/60 HzDimensions (w x h x d, with/without the stand). 211 x 250 x 160/211 x 250 x 126 (mm)Weight(with/without speakers) . 3.7 / 1.33 kgStandby power consumption .<2 WEco power standby . <1 WSpecifications and external appearance aresubject to change without notice.USB .V2.0/ V1.1. support MP3 and WMA filesNumber of albums/ folders . maximum 999Number of tracks/titles . maximum 999USB PLAYERSPECIFICATIONS1 - 4LEVEL 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 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!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 cleaning123For flap loaders (= access to CD drive possible)cleaning method 4 is recommendedINSTRUCTIONS ON CD PLAYABILITY1 - 6Exchange 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 (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.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 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.INSTRUCTIONS ON CD PLAYABILITY1 - 71) MCU version : at standby mode, press and hold “SOURCE“ & “PLAY“ buttons at the same time. e.g. V2.01 JT3Software checking: SOFTWARE VERSION CHECKING2 - 1 2 - 1 3 - 13 - 1SET BLOCK DIAGRAM4 - 14 - 1SET WIRING DIAGRAM
