Philips-MCM-761-Service-Manual(1) 电路图 维修手册.pdf

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1、MCM761/12/61 Copyright 2011 Philips Consumer Electronics B.V. Eindhoven, The Netherlands All 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

2、permission of Philips. Published by SL 1108 Service Audio Printed in The Netherlands Subject to modification Micro System Version 1.4 CLASS 1 LASER PRODUCT 3141 785 34044 TABLE OF CONTENTS Page Location of PC Boards & Versions Variation .1-2 Speci cations .1-3 Measurement Setup .1-4 Service Aids, Sa

3、fety Instruction, etc .1-5 to 1-7 Connections & Functional Overview.1-8 to 1-11 Troubleshooting .1-12 to 1-13 Disassembly Instructions & Service positions .2 Service Test Program .3 Set Block Diagram .4 Set Wiring Diagram .5 Display Board .6 Power Board .8 Cassette Board.9 CD Board .7 Main and Top K

4、ey Boards . 10 Set Mechanical Exploded View & Parts List .11 Revision List .12 RadioFans.CN 收音机爱 好者资料库 1-2 LACATION OF PCBS VERSION VARIATIONS: Type /Versions: Features Board in used: MCM761 Service policy * TIPS : C - Component Lever Repair. M - Module Lever Repair ?- Used /05/61 Feature diffrence

5、RDS VOLTAGE SELECTOR ECO STANDBY - DARK Type /Versions: DISPLAY BOARD TOP KEY BOARD TUNER BOARD CASS BOARD POWER BOARD MAIN BOARD /12/37/98 C C/M C M C C C/M C/M M C C/M MCM761 /05/61/12/37/98 ? ? CD BOARDC/MC C RadioFans.CN 收音机爱 好者资料库 1-3 GENERAL: Mains voltage : 110-127V/220-240VSwitchablefor/98 1

6、17V 10% for /37 220V 10% for /61 230 10% for /05/12 Mains frequency: 50/60Hz Power consumption: 55W at 1/8Prated 15W at Standby (Demo mode off) 0W at ECO Standby Clock accuracy: 4 seconds per day Dimension centre unit : : 340 x 179 x 252 mm ( L x D x H ) TUNER: FM Tuning range: 87.5-108MHz Grid: 50k

7、Hz 100kHz for /37 IF frequency: 10.7MHz 25kHz Aerial input: 75 ohm coaxial 300 ohm click fit for /37 Sensitivity at 26dB S/N: 25dB Image rejection: 25dB 75dB Distortion at RF=1mV, dev. 75kHz: 3% -3dB Limiting point: 18dB MW Tuning range: 531-1602kHz 530-1700kHzfor/98/37 Grid: 9kHz 10kHz for /98/37 I

8、F frequency: 450kHz 1kHz Aerial input: Frame aerial Sensitivity at 26dB S/N: 18dB IF rejection: 45dB Image rejection: 28dB Distortion at RF=50mV, M=80%: 5% AMPLIFIER: Output power (6 ohm, 1kHz, 10%THD) L & R: 2 x 75W RMS Frequency response within -3dB : 60Hz-16kHz Bass: 60Hz 3 Steps Treble: 12kHz 3

9、Steps Incredible Surround: On / Off Input sensitivity Aux in (at 1kHz) : 500mV at 600 ohm CD (Audio Disc1) : -6dB track (Trk 35) Output sensitivity Headphone output at 32 ohm : 15mW2dB(Max.vol.) CASSETTE RECORDER: Number of track: 2 tracks (stereo) Tape speed: 4.76 cm/sec 2% Wow and flutter: 48dBA S

10、ignal to Noise Ratio (Type II): 52dBA COMPACT DISC: Measurement done directly at the connector on the board. Output Resistance: 100 ohm Output Voltage (0dB, 1kHz): 0.5Vrms 1dB (unloaded) Channel Unbalance: 60dB Frequency Response (3dB) : 20Hz-20kHz Signal to Noise Ratio: 76dBA MP3-CD Bit Rate: 8-320

11、kbps Sampling Frequencies: 8,11.025,12,16,22.05,24, 32,44.1,48kHz .Values indicated are for ECO6 Cenelec Board only. USB : -6dB track WMA-CD Bit Rate: 64-192kbps Recording Format : ISO9660 UDF format not supported USB: Measurement done at speaker terminals across 6? load w/ 500mW output and DSC sett

12、ing in Jazz Mode. Frequency response within 3dB: 100Hz - 16kHz Signal/Noise ratio (A-weighted): 60dBA Channel crosstalk at 1kHz: 35dB Channel unbalance at 1kHz: 3dB SPECIFICATIONS RadioFans.CN 收音机爱 好者资料库 1-4 LF Generator e.g. PM5110 Recorder Use Universal Test Cassette CrO2SBC419 4822 397 30069 LEVE

13、L METER e.g. Sennheiser UPM550 with FF-filter S/N and distortion mete e.g. Sound Technology ST170 L R DUT or Universal Test Cassette FeSBC420 4822 397 30071 LEVEL METER e.g. Sennheiser UPM550 with FF-filter S/N and distortion meter e.g. Sound Technology ST1700B L R DUT CD Use Audio Signal Disc (repl

14、aces test disc 3) SBC429 4822 397 30184 Bandpass 250Hz-15kHz e.g. 7122 707 48001 LF Voltmeter e.g. PM2534 DUT S/N and distortion meter e.g. Sound Technology ST1700B Frame aerial e.g. 7122 707 89001 Tuner AM (MW,LW) To avoid atmospheric interference all AM-measurements have to be carried out in a Far

15、adays cage. Use a bandpass filter (or at least a high pass filter with 250Hz) to eliminate hum (50Hz, 100Hz). RF Generator e.g. PM5326 Ri=50? Bandpass 250Hz-15kHz e.g. 7122 707 48001 LF Voltmeter e.g. PM2534 DUT RF Generator e.g. PM5326 S/N and distortion meter e.g. Sound Technology ST1700B Use a ba

16、ndpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz). Ri=50? Tuner FM MEASUREMENT SETUP 1-5 SERVICE AIDS GBWARNING All ICs and many other semi-conductors are susceptible to electrostatic discharges (ESD). Careless handling during repair can reduce life drast

17、ically. When repairing, make sure that you are connected with the same potential as the mass of the set via a wrist wrap with resistance. Keep components and tools also at this potential. ESD CLASS 1 LASER PRODUCT GB Safety regulations require that the set be restored to its original condition and t

18、hat parts which are identical with those specified, be used Safety components are marked by the symbol !. Lead free Set remains closed! N Y Play a CD for at least 10 minutes Y playability ok ? N playability ok ? add Info for customer SET OK check playability N Y playability ok ? check playability ch

19、eck playability return set Customer complaint CD related problem fast lens cleaning For flap loaders (= access to CD drive possible) cleaning method is recommended INSTRUCTIONS ON CD PLAYABILITY 1 - 6 Exchange CDM -For description - see following pages PLAYABILITY CHECK For sets which are compatible

20、 with CD-RW discs use CD-RW Printed Audio Disc.7104 099 96611 TR 3 (Fingerprint) TR 8 (600 Black dot) maximum at 01:00 playback of these two tracks without audible disturbance playing time for: Fingerprint10seconds Black dot from 00:50 to 01:10 jump forward/backward (search) within a reasonable time

21、 For all other sets use CD-DA SBC 444A.4822 397 30245 TR 14 (600 Black dot) maximum at 01:15 TR 19 (Fingerprint) TR 10 (1000 wedge) playback of all these tracks without audible disturbance playing time for: 1000 wedge10seconds Fingerprint10seconds Black dot from 01:05 to 01:25 jump forward/backward

22、(search) within a reasonable time CUSTOMER INFORMATION It is proposed to add an addendum sheet to the set which informs the customer that the set has been checked carefully - but no fault was found. The problem was obviously caused by a scratched, dirty or copy-protected CD. In case problems remain,

23、 the customer is requested to contact the workshop directly. The lens cleaning (method ) should be mentioned in the addendum sheet. The final wording in national language as well as the printing is under responsibility of the Regional Service Organizations. LIQUID LENS CLEANING Because the material

24、of the lens is synthetic and coated with a special anti-reflectivity layer, cleaning must be done with a non-aggressive cleaning fluid. It is advised to use “Cleaning Solvent The actuator is a very precise mechanical component and may not be damaged in order to guarantee its full function. Clean the

25、 lens gently (dont press too hard) with a soft and clean cotton bud moistened with the special lens cleaner. The direction of cleaning must be in the way as indicated in the picture below. Before touching the lens it is advised to clean the surface of the lens by blowing clean air over it. This to a

26、void that little particles make scratches on the lens. INSTRUCTIONS ON CD PLAYABILITY 1 - 7 2-12-1 DISMANTLING INSTRUCTIONS Dismantling of the Cover Cassette and Universal Loader 1) Remove the Cover Cassette (pos 1+pos 2) in the direction as shown in Figure 1. 2) Loosen 4 screws to remove the Cover

27、Top (pos 62) by sliding it out towards the rear before lifting up. - 2 screws on the rear - 1 screw each on the left & right side 3) Loosen 2 screws each to remove the Panel Left (pos 61) and Panel Right (pos 60). The Panels are removed by sliding it towards the rear and outwards. - 1 screw on the r

28、ear - 1 screw on the side - see Service position A 4) Loosen 4 screws A (see Figure 2) to remove the Bracket Module Mounting (pos 54) and Universal Loader (pos 58). - 2 screws each on the left & right side Detaching the Universal Loader from the Bracket Module Mounting Figure 1 Figure 3 Figure 5 7er

29、ug iF 1) Remove 2 screws C (see Figure 5) from the bottom of the Cabinet Front . Detaching the Front Panel assembly from the Bottom/Rear assembly 2) Release the fixation of the Main Board to Bracket Combi by removing the 1 screw and pulling the Main Board outwards (see Figure 6). 3) Uncatch 2 catche

30、s on the left & right sides of the Cabinet Front and slides the Front Panel assembly out towards the front. - see Service position C Figure 4 1) SlideouttheLoaderTrayfullyandremove4screwsB(see Figure 4) to detach the Universal Loader (pos 58) from the Bracket Module Mounting (pos 54). - see Service

31、position B Figure 2 5) Shake up the Bracket Module Mounting and CD Loader as shown in Figure 3 till the Cover CD (pos7) fall off. 2-2 2-2 Dismantling of the Front Panel assembly 1) The Knob Volume (pos 10) can be remove by pulling it out in the direction as shown in Figure 7 2) TheKnobBass/KnobTrebl

32、e(pos11)canberemoveby pulling it out in the direction as shown in Figure 8. 3) Loosen 4 screws D (see Figure 10) to remove the Shield Tape Deck and Module Tape Deck (pos 29). 4) Loosen2screwsE(seeFigure9)toremovetheBracket Top Support . DISMANTLING INSTRUCTIONS 5) Loosen4screwsG(seeFigure9)toremovet

33、heBracket Main. 6) Loosen 6 screws C4 (see Figure 11) to remove the Display Board. 7) Loosen 4 screws H (see Figure 11) to remove the Top Key Board. Dismantling of the Front Panel assembly Figure 9 Figure 8 Figure 10Figure 12 Figure 11 1) Loosen 3 screws K and 2 catches C5 (see Figure 12) to remove

34、the Tuner Board assembly. 2) Loosen 3 screws L (see Figure 12) to free the Main Board. 3) Loosen 1 screw M (see Figure 12) to free the Mains Socket Board. 4) Loosen 1 screw N and 2 catches C6 (see Figure 12) to freethePanelRear(pos53)byslidingitouttowardsthe rear. Note : Tuner Board assembly and Mai

35、ns Socket Board canalsoberemovetogetherwiththePanelRear. Dismantling of the Rear Panel assembly Figure 7 Service position A Service position B Service position C DISMANTLING INSTRUCTIONS Repair Hints & Service Positions 1) DuringrepairitispossibletodisconnecttheTunerBoard and/or CD Module completely

36、 unless the fault is sus- pected to be in that area.This will not affect the performance of the rest of the set. Note: The flex cables are very fragile, care should be taken not to damage them during repair. After repair, be very sure that the flex cables are inserted properly intotheflexsocketsbefo

37、reencasing,otherwisefaults may occurs. 2-3 2-3 3-13-1 Various other Tests Activated withACTIONTEST EEPROM FORMAT TEST Load default data. Display shows NEW for 1 second. Caution! All presets from the customer will be lost! Disconnect mains cord LEAVE SERVICE TEST PROGRAM S S 9 to Exit .MORPEEehtottne

38、sebl l iwsnret tap t s eTTSETMORPEE PASS is displayed if the uProcessor read back the test patterns correctly, otherwise FAIL will be displayed. Volume, Treble or Bass Knob ROTARY ENCODER TEST Display shows value for 2 seconds. Values increases or decreases until Volume Maximum (0dB) or Volume Minim

39、um (VOL MUTE) is reached. BIIDEMO TOGGLE Pressing this button will toggle between DEMO ON and DEMO OFF. The DEMO status will scroll once across the Display. Figure 1 Figure 2 LEDs ECO CD TUNER TAPE AUX Volume Rotary Off On On On On On Off On Off On Off On Pattern 1Pattern 2 Table 2 Y N Y N DIM or RD

40、S Button pressed? DIM or RDS Button pressed? DISPLAY TEST Display shows Figure 1 and switch all LEDs on except ECO LED (see Table 2 Pattern 1) Display shows Figure 2 and switch alternate LEDs on (see Table 2 Pattern 2) Y N 9 Button pressed? CD (on RC) Button pressed? Y N STEP 1 2 3 DISPLAY MESSAGE -

41、 - - - - - ACTION Indicates the module used. Version of the MPEG software (nn = Version Number). Bit rate check Press9to exit. OKAYERROR CD USB MO-Vnn BITRATE TESTING Choose level by pressing on the RC Q R Note : Disc should be available on the tray before entering the Service Test Mode. MP3-CD MODU

42、LE TEST Y Y Y N N N Display shows 12M Output at (Display Board) pin 19 of uP = 2,929.6875Hz Display shows 32K Output at (Display Board) pin 19 of uP = 2048Hz QUARTZ TEST TAPE Button pressed? TAPE Button pressed? 9 Button pressed? TUNER Button pressed? Disconnect Mains cord ? Y Y N N Y Display Tuner

43、Version ccc Service frequencies are copied to the RAM (see Table 1) Tuner works normally except: PROGRAM button Service Mode left TUNER TEST TUNER Button pressed? N PRESET 1 2 3 4 5 6 7 8 9 10 11 Europe EUR 87.5MHz 108MHz 531kHz 1602kHz 558kHz 1494kHz 87.5MHz 87.5MHz 87.5MHz 87.5MHz 98MHz East Europ

44、e EAS 87.5MHz 108MHz 531kHz 1602kHz 558kHz 1494kHz 87.5MHz 87.5MHz 87.5MHz 87.5MHz 98MHz USA USA 87.5MHz 108MHz 530kHz 1700kHz 560kHz 1500kHz 98MHz 87.5MHz 87.5MHz 87.5MHz 87.5MHz Oversea OSE 87.5MHz 108MHz 531/530kHz* 1602/1700kHz* 558/560kHz* 1494/1500kHz* 87.5/98MHz* 87.5MHz 87.5MHz 87.5MHz 98/87

45、.5MHz* Table 1 East Eur. Extended-band EAS 65.81MHz 108MHz 74MHz 87.5MHz 531kHz 1602kHz 558kHz 1494kHz 98MHz 70.01MHz 65.81MHz Note: * Depending on the selected grid frequency (9 or 10kHz). By holding the ECO and TUNER buttons depressed while switching on the Mains supply, one of the undermentioned

46、features will be activated: - the tuning grid frequency is toggled between 9kHz and 10kHz for the Oversea (/98) version. - the extended FM1 (65.81MHz - 74MHz) is toggled on and off for East Eur. version. To start service test program hold PREVIEW & PLAY buttons depressed while plugging in the mains cord and in standby status. Display shows the ROM version S-Vyy (Main menu) S refers to Service Mode V refers to Version yy refers to Software version n