Philips-MCM-768-Service-Manual电路原理图.pdf

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1、 MCM765/55/77/85Copyright 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 prio

2、r permission of Philips.Published by SL 0842 Service Audio Printed in The Netherlands Subject to modificationMicro SystemVersion 1.1CLASS 1LASER PRODUCT 3141 785 32811TABLE OF CONTENTSPagePCBs Location .1-2Specifi cations .1-3Measurement Setup .1-4Service Aids, Safety Instruction, etc .1-5 to 1-7Ser

3、vice Test Mode . 2Set Block Diagram & Set Wiring Diagram . 3Main Board & HP Board . 4Front Board. 5Key Board . 6CD Board . 7Cassette Board . 8Set Mechanical Exploded View & Parts List . 91-2TOP KEY BOARDFRONT BOARDKEY BOARDCASSETTE BOARDCD BOARDSWITCHING SUPPLY MODULEMAIN BOARDFM TUNER MODULEAC CORE

4、 BOARDSINGLE CASS DECKCD MECHANISMCD LOADER/77 /85niRDC/nixuAMP3 LinkVideo OutSubwoofer OutDigital OutKaraoke FeaturesVoltage SelectorECO Power Standby (LCD Display Off)USB DirectType /Versions: Featuresin used:/55VERSION VARIATIONSType /Versions:Board in used:MCM765Service policyMAIN BOARDKEY & TOP

5、 KEY BOARDFRONT BOARDCASSETTE BOARD* TIPS : C - Component Lever Repair.M - Module Lever Repair- Used/05 /12 /55 /85/77Feature diffrenceCCD BOARDCCCTUNER MODULE MxxCSWITCHING SUPPLY MODULEMAC CORE BOARDCCCCCMCMCCCCCMCMCMCM765xxxxxPCBS LOCATION1-3SPECIFICATIONSAMPLIFIEROutput power . 4 x 75 W RMS*Sign

6、al-to-noise ratio. t 62 dBA (IEC)Frequency response . 40 15000 Hz, 3 dBImpedance loudspeakers . 4 :Impedance headphones . 32 :* (4 :, 1 kHz, 10% THD)CD/MP3-CD PLAYERNumber of programmable tracks . 20Frequency range . 20 20000 HzSignal-to-noise ratio. 75 dBAChannel separation .t 60 dB (1 kHz)Total ha

7、rmonic distortion. 0.5%MPEG 1 Layer 3 (MP3-CD) . MPEG AUDIOMP3-CD bit rate . 32-256 kbps(128 kbps advised)Sampling frequencies . 32, 44.1, 48 kHzUSB PLAYERUSB . 12Mb/s, V1.1. support MP3 and WMA filesNumber of albums/folders . maximum 99Number of tracks/titles . maximum 500TUNERFM wave range . 87.5

8、108 MHzSensitivity at 75 : mono, 26 dB signal-to-noise ratio . 2.8 V stereo, 46 dB signal-to-noise ratio . 61.4 VTotal harmonic distortion. d 5%Frequency response . 63 12500 Hz ( 3 dB)Signal-to-noise-ratio . t 50 dBATAPE DECKFrequency responseNormal tape (type I). 80 12500 Hz (8 dB)Signal-to-noise r

9、atioNormal tape (type I). 50 dBAWow and flutter . d 0.4% DINSPEAKERSSystem 2-way, double port bass reflexWoofer . 1x13 cmTweeter . 1x5 cmGENERAL INFORMATIONAC Power . 110 240 V, 60Hz / 50 HzStandby Power Consumption .d 18 WDimensions (w x h x d) Main unit (w x h x d) . 175 x 252 x 360 mm Speaker box

10、 (w x h x d) 175 x 252 x 214 mmWeightWith packing. 10.16 kgMain unit . 3.18 kgSpeaker box . 5.36 kgSpecifications and external appearance aresubject to change without notice.1 - 4LEVEL METERe.g. Sennheiser UPM550with FF-filterS/N and distortion metere.g. Sound Technology ST1700BLRDUTCDUse Audio Sign

11、al 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 Fara

12、days 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 t

13、o 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,

14、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

15、 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

16、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 09

17、9 96611TR 3 (Fingerprint)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

18、 (600 Black dot) maximum 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 pr

19、oposed 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 len

20、s 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 lay

21、er, 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

22、 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 PLAYABILIT

23、Y1 - 7SERVICE TEST MODE2 - 1 2 - 11. How to enter Test Mode:1. Plug out the power cord.2. Hold “FB” key and “STOP” Key.3. Plug in power cord.4. Unit will enter test mode.2. Test mode operation:1. Each VFD grid will ON for every 1s, starting from grid 1 to grid 12.2. Then, each VFD grid will OFF for

24、every 1s, starting from grid 1 to grid 12. 3. Plug out the power cord and plug in again, test mode will be exit.3. Version Check:1. In Power ON Mode, Hold “PLAY” key for 5s. LCD will show the data code and version number.4. USB Version Check:1. In Power ON USB Mode, Hold “STOP” and “SOURCE” key for

25、5s. LCD will show the USB chip version number: MM SS (M=main ver S=sub ver).5. USB Version Update:1. In Power ON CD Mode, Hold “STOP” and “FB” key for 5s. LCD will show the “UPDATE”. 2. Plug-in USB drive will show “LOADING”3. Wait until the screen show “LOAD OK” and then press “PLAY” to startupdate.

26、 4. The Screen shows the “WRITING” during the update process5. “Complete” will show up after updating the USB chip. Plug out the power cord and plug in again to resume normal operations.SET BLOCK & WIRING DIAGRAM3 - 1 3 - 1CIRCUIT DIAGRAM - MAIN BOARDAUDIO & POWER AMP. SECTION (only for /55/77)4 - 1 4 - 1