Philips-CEM-250-Service-Manual电路原理图.pdf
CEM250/55/98/51©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 JZ-SL 0950 Service Audio Printed in The Netherlands Subject to modificationCar Entertainment SystemVersion 1.4CLASS 1LASER PRODUCT© 3141 785 33194TABLE OF CONTENTSPagePCBs Location .1-1Speci cations .1-2Measurement Setup .1-3Service Aids, Safety Instruction, etc .1-4Instructures on CD Playability .1-5 to 1-6Disassembly Diagrams .2-1 to 2-2Software Version Check 1kHz,0dB,10k© load)2.0V(USB play mode;61kHz,0dB,10k© load)“e300mV188×58×128MM1.0kgFrequency range-FMFrequency range-AM(MW)Usable sensitivity-FMUsable sensitivity-AM(MW)(S/N=20dB)Frequency responseStereo separationSignal/noise ratio87.5-108.0MHz(Eur)87.5-107.9MHz(Ame)522-1620kHz(Eur)530-1710MHz(Ame)8dBu3.2dBu20Hz-20kHz30db(1kHz)ÿ75dBMEASUREMENT SETUPTuner FMDUTRF GeneratorBandpassLF Voltmetere.g. PM5326250Hz-15kHze.g. 7122 707 48001 e.g. PM2534S/N and distortion metere.g. Sound Technology ST1700BRi=50©Use a bandpass filter to eliminate hum(50Hz,100Hz) and disturbance from the pilottone(19kHz,38kHz). Tuner AM (MW,LW)DUTRF GeneratorBandpassLF Voltmetere.g. PM5326250Hz-15kHze.g. 7122 707 48001 e.g. PM2534S/N and distortion metere.g. Sound Technology ST1700BRi=50©Frame aeriale.g. 7122 707 89001To 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 ).'DUT DUTLRLF Generatore.g. PM5110LEVEL METERe.g. Sennheiser UPM550with FF-filterS/N and distortion metere.g. Sound Technology ST1700BLRLEVEL METERe.g. Sennheiser UPM550with FF-filterS/N and distortion metere.g. Sound Technology ST1700BUse Audio Signal Disc SBC429 4822 397 30184(replaces test disc 3) CassetteUse Universal Test Cassette CrO2 SBC419 4822 397 30069 or Universal Test Cassette Fe SBC420 4822 397 30071CD1-31-4SERVICE AIDSGBGBWARNINGAll 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 PRODUCTSafety 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 free1-5INSTRUCTIONS ON CD PLAYABILITYSet remains closed!check playabilityNNNYYYcheck playabilityExchange CDM“fast“ lens cleaningplayabilityok?playabilityok?playabilityok?$Customer complaint“CD related problem“Check playabilityPlay a CDfor at least 10 minutesann lnfo for customer“SET OK“ $areturn set$-$cFor description-see following pages$bFor flap loaders(=access to CD drive possible)clesning method$cis recommended1-5INSTRUCTIONS ON CD PLAYABILITYSet remains closed!check playabilityNNNYYYcheck playabilityExchange CDM“fast“ lens cleaningplayabilityok?playabilityok?playabilityok?$Customer complaint“CD related problem“Check playabilityPlay a CDfor at least 10 minutesann lnfo for customer“SET OK“ $areturn set$-$cFor description-see following pages$bFor flap loaders(=access to CD drive possible)clesning method$cis recommended2-1 2-1Disassembly Diagram12345 6 71. Remove the mounting sleeve with the removal keys. Press key and remove the front panel. 2. Remove the two screws on the back side of the unit with a screw driver. 4. Remove the screw 3 as shown. 5. Remove the bottom cover with a tool. 3. Remove the upper cover with a tool. 6. Remove the screws 4 with a screw driver. 7. Remove the screw 5 with a screw driver. 8. Remove the connectors 6, and then remove the mechanism core. 9. Remove the adhesive tapes 7. 1211102-2 2-2Disassembly Diagram8910. Remove the screw 8 . 11. Remove the screw 9 . 12. Remove the screw 10 . 13. Remove the connectors 11, and then remove the bracket with a tool. 14. Remove the screws 12. 3-1 3-1Software version check & upgrade Upgrade softwareVS-10410Check Servo software version20Check MCU software version30Check BT software versionVM-103VBT-177 In USB/SD/Disc mode, press DISP + 6 simutaliously for 2 sec, LCD display is as below: In tuner mode, press DISP + 6 simutaliously for 2 sec, LCD display is as below: In tuner mode, press DISP + 5 simutaliously for 2 sec, LCD display is as below: 102 is the servo software version 101 is the MCU software version 177 is the MCU software version 10 Copy servo software “BOOT.ALI“ and “nemo.bin“ into USB memory, plug the USB memory into USB socket.Device upgrade servo software automatically,Don't power off or disconnect power during the upgrade, LCD show:SERVO UPGRADING,DON'T PWR OFFAround 1 minute,servo software upgrade completed and device change to radio mode automatically20 Delete the servo software in the USB and copy the MCU software “CEM250MCU“ (for CEM250) into USB memory, plug the USB memory into USB socket.Device upgrade MB software software automatically Don't power off or disconnect power during the upgrade, LCD show:Around 1 minute,MB software upgrade completed and device power off automatically,disconnect the USB memory.MCU UPG
