Philips-MCM-768-Service-Manual(1) 电路图 维修手册.pdf

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1、 MCM765/55/77/85 Copyright 2008 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 pr

2、ior permission of Philips. Published by SL 0842 Service Audio Printed in The Netherlands Subject to modification Micro System Version 1.1 CLASS 1 LASER PRODUCT 3141 785 32811 TABLE OF CONTENTS Page PCBs Location .1-2 Specifi cations .1-3 Measurement Setup .1-4 Service Aids, Safety Instruction, etc .

3、1-5 to 1-7 Service Test Mode .2 Set Block Diagram & Set Wiring Diagram .3 Main Board & HP Board .4 Front Board.5 Key Board .6 CD Board .7 Cassette Board .8 Set Mechanical Exploded View & Parts List .9 RadioFans.CN 收音机爱 好者资料库 1-2 TOP KEY BOARD FRONT BOARD KEY BOARD CASSETTE BOARD CD BOARD SWITCHING S

4、UPPLY MODULE MAIN BOARD FM TUNER MODULE AC CORE BOARD SINGLE CASS DECK CD MECHANISM CD LOADER /77 /85 n iRDC/n ixuA MP3 Link Video Out Subwoofer Out Digital Out Karaoke Features Voltage Selector ECO Power Standby (LCD Display Off) USB Direct Type /Versions: Features in used: /55 VERSION VARIATIONS T

5、ype /Versions: Board in used: MCM765 Service policy MAIN BOARD KEY & TOP KEY BOARD FRONT BOARD CASSETTE BOARD * TIPS : C - Component Lever Repair. M - Module Lever Repair - Used /05/12/55/85/77 Feature diffrence C CD BOARD C C C TUNER MODULEM x x C SWITCHING SUPPLY MODULEM AC CORE BOARDC C C C C M C

6、 M C C C C C M C M C MCM765 x xx xx PCBS LOCATION RadioFans.CN 收音机爱 好者资料库 1-3 SPECIFICATIONS AMPLIFIER Output power . 4 x 75 W RMS* Signal-to-noise ratio. ? 62 dBA (IEC) Frequency response .40 15000 Hz, 3 dB Impedance loudspeakers . 4 ? Impedance headphones . 32 ? * (4 ?,1 kHz, 10% THD) CD/MP3-CD PL

7、AYER Number of programmable tracks . 20 Frequency range . 20 20000 Hz Signal-to-noise ratio. 75 dBA Channel separation .? 60 dB (1 kHz) Total harmonic distortion. 0.5% MPEG 1 Layer 3 (MP3-CD) . MPEG AUDIO MP3-CD bit rate . 32-256 kbps (128 kbps advised) Sampling frequencies .32, 44.1, 48 kHz USB PLA

8、YER USB . 12Mb/s, V1.1 . support MP3 and WMA files Number of albums/folders .maximum 99 Number of tracks/titles.maximum 500 TUNER FM wave range .87.5 108 MHz Sensitivity at 75 ? mono, 26 dB signal-to-noise ratio . 2.8 V stereo, 46 dB signal-to-noise ratio . 61.4 V Total harmonic distortion. ? 5% Fre

9、quency response . 63 12500 Hz ( 3 dB) Signal-to-noise-ratio . ? 50 dBA TAPE DECK Frequency response Normal tape (type I).80 12500 Hz (8 dB) Signal-to-noise ratio Normal tape (type I). 50 dBA Wow and flutter . ? 0.4% DIN SPEAKERS System 2-way, double port bass reflex Woofer . 1x13 cm Tweeter. 1x5 cm

10、GENERAL INFORMATION AC Power. 110 240 V, 60Hz / 50 Hz Standby Power Consumption .? 18 W Dimensions (w x h x d) Main unit (w x h x d) . 175 x 252 x 360 mm Speaker box (w x h x d) 175 x 252 x 214 mm Weight With packing. 10.16 kg Main unit . 3.18 kg Speaker box . 5.36 kg Specifications and external app

11、earance are subject to change without notice. RadioFans.CN 收音机爱 好者资料库 1 - 4 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 (replaces test disc 3) SBC429 4822 397 30184 Bandpass 250Hz-15kHz e.g. 7122 707 48001

12、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 Faradays cage. Use a bandpass filter (or at least a high pass filter with 250Hz) to

13、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 bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (1

14、9kHz, 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 drastically. When repairing, make sure that you are connected with the same potential

15、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 that parts which are identical with those specified, be used Safety components are

16、 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 check playability return set Customer complaint CD related problem fast lens cleani

17、ng 1 2 3 For flap loaders (= access to CD drive possible) cleaning method 4 is recommended INSTRUCTIONS ON CD PLAYABILITY 1 - 6 Exchange CDM 1- 4 For description - see following pages 1 PLAYABILITY CHECK For sets which are compatible with CD-RW discs use CD-RW Printed Audio Disc.7104 099 96611 TR 3

18、(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 For all other sets use CD-DA SBC 444A.4822 397 30245 TR 14 (600 Bl

19、ack 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 (search) within a reasonable time 2 CUSTOMER INFORMATION It is prop

20、osed 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, the customer is requested to contact the workshop directly. The

21、lens cleaning (method 3) 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. 4 LIQUID LENS CLEANING Because the material of the lens is synthetic and coated with a special anti-reflec

22、tivity 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 lens gently (dont press too hard) with a soft and clean cotto

23、n 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 avoid that little particles make scratches on the lens. INSTRUC

24、TIONS ON CD PLAYABILITY 1 - 7 SERVICE TEST MODE 2 - 12 - 1 1. 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. T

25、hen, each VFD grid will OFF for 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 Mod

26、e, Hold “STOP” and “SOURCE” key for 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 sh ow the “UPDATE”. 2. Plug -in USB drive will show “LOADING” 3. Wait until the screen show “LOAD

27、OK” and then press “PLAY” to start update. 4. The Screen shows the “WRITING” during the update process 5. “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 DIAGRAM 3 - 13 - 1 CIRCUIT DIAGRAM - MAIN BOARD AUD

28、IO & POWER AMP. SECTION (only for /55/77) 4 - 14 - 1 CIRCUIT DIAGRAM - MAIN BOARD AUDIO & POWER AMP. SECTION (only for /85) 4 - 24 - 2 4 - 3 4 - 3 CIRCUIT DIAGRAM - MAIN BOARD MCU & POWER SUPPLY SECTION 4 - 4 4 - 4 LAYOUT DIAGRAM - MAIN BOARD TOP VIEW 4 - 5 4 - 5 LAYOUT DIAGRAM - MAIN BOARD BOTTOM V

29、IEW 4 - 6 4 - 6 LAYOUT DIAGRAM - HEADPHONE BOARD 5 - 15 - 1 CIRCUIT DIAGRAM - FRONT BOARD 5 - 25 - 2 LAYOUT DIAGRAM - FRONT BOARD TOP VIEW 5 - 35 - 3 LAYOUT DIAGRAM - FRONT BOARD BOTTOM VIEW 6 - 16 - 1 LAYOUT DIAGRAM - TOP KEY BOARD TOP VIEW 6 - 26 - 2 LAYOUT DIAGRAM - TOP KEY BOARD BOTTOM VIEW CIRC

30、UIT DIAGARM - CD BOARD 7 - 17 - 1 LAYOUT DIAGARM - CD BOARD TOP VIEW 7 - 27 - 2 LAYOUT DIAGARM - CD BOARD BOTTOM VIEW 7 - 37 - 3 8 - 18 - 1 CIRCUIT DIAGRAM - CASSETTE BOARD 8 - 28 - 2 2 1 3 4 LAYOUT DIAGRAM - CASSETTE BOARD COMPONENT SIDECOPPER SIDE 8 - 38 - 3 TAPE ADJUSTMENT & CHECK TABLE For Auto-

31、reverse version only * If high frequencies are not within limits, decrease bias and re-measure. If distortion is too high, increase bias and re-meaure PLAYmV-metercheck 125mV +/- 3dB (see fig.1 for freq. response) PLAYBACK LEVEL & FREQ. RESPONSE TEST CASSETTE RECORDER MODE MEASURE ON READ ON ADJUST

32、with MOTOR SPEED SBC420 3150Hz PLAY frequency counter check PLAY PLAY FWD PLAY REV W&F-meter mV-meter left hand screw right hand screw max. output level & left=right WOW & FLUTTER ADJUST AZIMUTH 3150Hz +/- 2% 0.4 % DIN to 12or LEFTRIGHT Inject 3mV signals 100Hz, 250Hz, 1kHz, 10kHz, 12.5kHz 12or LEFT

33、RIGHT Inject 1kHz 8.85mV 34orvia 34orvia 12or LEFTRIGHT RECORD RECORD PLAY PLAY mV-meter THD-meter check check limits see fig. 2 * 3% * RECORDED CASSETTE RECORDED CASSETTE figure. 1 f(Hz) level(dB) 8dB6dB 12.5k4k25080 8dB f(Hz) level(dB) 8dB6dB 10k4k250100 8dB figure. 2 check SBC419A : 4822 397 3006

34、9 SBC420 : 4822 397 30071 SBC420 3150Hz SBC420 10kHz SBC419A or SBC420 SBC419A or SBC420 SBC420 315Hz CHECK RECORD/PLAYBACK FREQUENCY AND DISTORTION SET MECHANICAL EXPLODED VIEW 9 - 19 - 1 18VKSW33 1034 31 30 35 24 25 20 19 21 27 22 DAMP 32 23 TRAF 3 32 26 17 1 14 12 CADS SWS 13 38 28 29 CDS2 CDT DA

35、MP 15 CDS1 CDM 16 MECHANICAL & ACCESSORIES PARTS LIST 9 - 2 1994000001434 CASS MECHANISM W991S-390ANT994000003268ANTENNA WIRE 1000MM 2 !9965100186901.5M VDE POWER CORD /55CADS996510002331CASSETTE DOOR SPRING 2 !9965100167211.5M VDE POWER CORD /77CDM994000003553CDM DA12T3V 2 !9965100008765FT VDE POWE

36、R CORD /85CDS1996510001074CD SPRING DIM:0.5MM 3996510012855 FM TUNER MODULECDS2996510001075CD SPRING DIM:0.6MM 4996510016579FFC L100MM P1.25 10PCDT996510000871CD TRAY LOADER 5996510016580 FFC L100MM 15PDAMP996510000868CD DAMPER PINK 658F 6996500017774 FFC 16P L140MMREM996510019921REMOTE CONTROL /85

37、7994000005765 FFC 7P L60MMREM996510019920REMOTE CONTROL /77/55 8996510016581 FFC L170MM P1.25 12PSWS994000005777SWITCH SPRING 9996510016582 FFC L230MM P1.25 7PTAC996510002319 TACT SWITCH EVQ11L04M 10996510016584USB RUBBER COVER /55/85TRAF! 996510016583SWITCH SUPPLY MODULE 10996510016722 USB RUBBER C

38、OVER /77VKSW996510016578VOLUME KNOB SPRING D0 8MM 10996510016722 USB RUBBER COVER /77VKSW996510016578VOLUME KNOB SPRING D0.8MM 11994000001409CD DOOR GEAR HOLDER 12996510000402 BRACKET PUSH LOCK 13994000001412 PUSH LOCK FOR CASSETTE DOOR 14994000004801 BRACKET - CASSETTE DOOR 15996510002333TOP CABINE

39、T 16996510002334 LEFT CABINET 16996510002334 LEFT CABINET 17996510002335 RIGHT CABINET 18996510002337VOLUME KNOBNote: Only these parts mentioned in the list are 19996510017001POWER KEY normal service parts. 20996510002342POWER LENS 21996510002347 BRACKET -TOP BUTTON 22996510016585 BRACKET-FRONT CABI

40、NET DISPLAY 23996510002348 BRACKET CD DOOR 24996510018689 USB LIGHT GUIDE 25996510016587 FRONT CABINET 26996510016588REAR CABINET /55/77 26996510017002 REAR CABINET /85 2727 996510016595MODE KEY CLUSTER BUTTONS 28996510016620CD CONTROL KEY CLUSTER BUTTONS /55/77 28996510002340CD CONTROL KEY CLUSTER

41、BUTTONS /85 29996510016621TOPKEY CLUSTER BUTTONS 30 996510016622DISPLAY LENS 31996510016623CONTROL PANEL /55/77 31996510017003CONTROL PANEL /8531996510017003CONTROL PANEL /85 32996510016624CD DOOR 33996510016625CASSETTE DOOR 34996510016626DECORATION STRIP LEFT 35996510016627DECORATION STRIP RIGHT 36

42、996510016628FM TUNER BRACKET 37996510016589CD TRAY37996510016589CD TRAY 38996510002350CASSETTE DOOR DAMPING GEAR 39996510018691 WOODEN SPEAKER (L+R) ELECTRICAL PARTS LIST 9 - 3 6612 996510015966 DIODE 1N4001 TAPE FORMD3203 996510010774 DIODE 1N4148 FDLL4148 6772 996510011332 DIODE 1N4148D3204 996510

43、010774 DIODE 1N4148 FDLL4148 6773 996510011332 DIODE 1N4148D3205 996510010774 DIODE 1N4148 FDLL4148 6774 996510011332 DIODE 1N4148D3206996510010774DIODE 1N4148 FDLL4148 6776 996510011332 DIODE 1N4148HP801996510002322D3.5MM ST. JACK TC38-103-DG-010 6777 996510011338 DIODE BZX79-B8V2 SOD27IC701996510012790IC LC786921W-UPHI-E6777DIODE BZX79 B8V2 SOD27IC701996510012790IC LC786921W UPHI E 6778 9