Philips-MCM-726-Service-Manual电路原理图.pdf

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1、Version 1.0MCM726 3141 785 31790MP3 Micro Hi-Fi Systemall versions Published by LX 0717 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

2、transmitted, in any form or by any means, electronic, mechanical, photocopying,or otherwise without the prior permission of Philips.Handling chip components . 1-1Leadfree and safety information . 1-2Technical specification . 2-1Service tools . 2-1Service measurement setup . 2-2Connections and contro

3、ls. 3-1.3-2Dismantling instructions . 4-1.4-3Block diagram. 5-1Wiring diagram . 6-1Main Board circuit diagram . 7-1.7-2layout diagram . 7-3.7-4C Music Boardcircuit diagram . 8-1.8-2layout diagram . 8-3.8-4VFD Boardcircuit diagram. . 9-1layout diagram . 9-2Cassette Boardcircuit diagram . 10-1 layout

4、diagram . 10-2Tuner Boardcircuit diagram. .11-1layout diagram .11-2Rectifier Boardcircuit diagram. . 12-1layout diagram . 12-2Exploded view diagram . 13-1Mechanical partslist . 13-2Electrical partslist . 14-1.14-5Supplier BomlistTABLE OF CONTENTS1 - 11 - 22 - 1TECHNICAL SPECIFICATIONS2 - 2SERVICE ME

5、ASUREMENTBandpass250Hz-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 (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz).Ri=50Bandpass250Hz-15kHze.g. 7122 707 4

6、8001LF 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 bandpass filter (or at least a high pass filter with 250kHz) to elim

7、inate 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 4822 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=503 - 1CONNECTION AND CONTROLS3 - 2CONNECTION AND CONTROLS5 - 1 5 - 1SET BLOCK DIAGRAM6 - 16 - 1SET WIRING DIAGRAM7 - 17 - 1CIRCUIT DIAGRAM - MAIN BOARDPART 1