Philips-MCD-759-D-Service-Manual(1) 电路图 维修手册.pdf

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1、Version 1.0 MCD759D 3141 785 31970 DVD Micro Theatre all versions Published by LX 0728 Service Audio Subject to modification Copyright 2007 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

2、 transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of Philips. Service Aids .1-1 CD Playability Check .1-2.1-4 Technical specification .2-1 Service tools .2-1 Service measurement setup .2-2 Disassembly diagram.3-1.3-6 Software v

3、ersion check and upgrading .4-1 Block diagram .5-1 Wiring diagram .6-1 VFD Board circuit diagram .7-1 layout diagram .7-2 AMP Board circuit diagram .8-1 layout diagram .8-2.8-3 Tuner Board circuit diagram. .9-1 layout diagram .9-2 Power Board circuit diagram. .10-1 layout diagram .10-2.10-3 DVD MPEG

4、 Board circuit diagram. .11-1.11-5 layout diagram .11-6 CPU Board circuit diagram. .12-1 layout diagram .12-2.12-3 Spare partslist.13-1.13-2 Supplier Original partslist TABLE OF CONTENTS RadioFans.CN 收音机爱 好者资料库 1-1 Service Tools: Universal Torx driver holder .4822 395 91019 Torx bit T10 150mm .4822

5、395 50456 Torx driver set T6-T20 .4822 395 50145 Torx driver T10 extended .4822 395 50423 Compact Disc: SBC426/426A Test disc 5 + 5A .4822 397 30096 SBC442 Audio Burn-in test disc 1kHz .4822 397 30155 SBC429 Audio Signals disc .4822 397 30184 Dolby Pro-logic Test Disc .4822 395 10216 SERVICE AIDS GB

6、WARNING 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 as the mass of the set via a wrist wrap with resistance. Keep compon

7、ents 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 marked by the symbol !. Lead free RadioFans.CN 收音机爱 好者资料库 Set remai

8、ns closed! Standard repair procedure N Y Play a CD for at least 10 minutes Y playability ok ? N playability ok ? add Info for customer SET OK playability ok ? Y N check playability N Y playability ok ? check playability check playability EYE-Pattern ok ? N Y check EYE-Pattern replace CD Drive Laser

9、current ok ? N Y check Laser current CD Drive offsets ok ? NY check CD Drive offsets clean the lens check playability return set Customer complaint CD related problem return set return set replace CD Drive return set replace CD Drive return set replace Signal Processor return set fast lens cleaning

10、1 2 3 4 5 6 7 For flap loaders (= access to CD drive possible) cleaning method 4 is recommended 1 - 7 For description - see following pages CD PLAYABILITY CHECK 1-2 RadioFans.CN 收音机爱 好者资料库 1 PLAYABILITY CHECK For sets which are compatible with CD-RW discs use CD-RW Printed Audio Disc.7104 099 96611

11、TR 3 (Fingerprint) TR 8 (600 Black dot) maximum at 01:00 playback of these two tracks without audible disturbance playing time for: Fingerprint 10seconds 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 (

12、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 wedge 10seconds Fingerprint 10seconds Black dot from 01:05 to 01:25 jump forward/backward (search) within a reasonable time 2 CUSTOMER INFORMATION It

13、 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, the customer is requested to contact the workshop direct

14、ly. The 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. 3 FAST LENS CLEANING (dry brush) Use lens cleaning CD SBC AC300.9082 100 00043 Insert the lens cle

15、aning CD, press PLAY and follow the voice guides instructions on the CD. 4 LIQUID LENS CLEANING Because the material 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 B4-No2”,

16、 available with codenumber 4822 389 10026. 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 cotton bud moistened with the special lens cleaner. The direction of cleani

17、ng 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. CD PLAYABILITY CHECK 1-3 5 EYE-PATTERN SIGNAL JITTER MEASUREMENT Measure the

18、signal on the input of the Signal processor using an analog oscilloscope. Please find the exact measuring point in your Service Manual. See below examples of the signal. Amplitude should read at least 700mVpp using SBC444A. good bad If the oscilloscope shows a signal like the bad one, and/or the amp

19、litude decreases within 1 minute - the CD drive has to be replaced. 6 CD DRIVE LASER CURRENT MEASUREMENT The laser current can be measured as a voltage drop on a resistor. The resistor is marked in every Service Manual. The value depends on the type of CD drive. typical valuemost probably defect VAM

20、xxxx: 150-230mV350mV MCDxx: 170-230mV300mV DA1x: 210-250mV350mV DA2x: 175-200mV250mV Use SBC444A (CD-DA) for measurement. 7 CD DRIVE OFFSET MEASUREMENT The photodiodes of the CD-drive may have an offset. These offsets have to be compensated by the signal processor. High offsets can lead to poor play

21、ability of some CDs (skipping tracks). To measure the offset values, start the Service Test Program - section “Focus Test” without a CD. The offsets can be measured with a DC Millivoltmeter directly on the connector (see drawing below). Pin numbering varies from drive to drive. The values from diode

22、 A-D should read 010mV. Diodes E and F are less critical. If one of the offsets is higher than 10mV the CD drive has to be replaced. Otherwise replace the Signal Processor. Sanyo DA12T3 CD Drive A A F C B E C D E VCC B VREF F D 9 10 11 12 13 14 15 16 1800 +5V_HF VrefCD10 A D E B C F GND8 E D A B C F

23、 Laser power control 100n 2878 470n 2876 3821 1R 1K 3823 2880 33p +5V BC807-40 7879 3817 47R 3820 4R7 47R 3819 1n 2879 2877 47u 1 8 4 7811-A LM358D 3 2 10K 3822 47R 3818 2841 100n 47n 2869 +5V_HF LASER DIODE U 250mV -Laser damaged ! 4,6V 3V 3,3V 3,9V 2V 0,17V 0,17V Sanyo DA12T3 HF-Amplifier D3 D2 D1

24、 Drive detection 680R 3905 3903 3K3 BC847B 7877 47n 2818 1K5 3902 5 7 4 2 1 6 3 64 8 9 10 11 470R 3893 +3.3V 2K2 3908 10K 3923 BC847B 7878 BC847B 7876 4n7 2813 3896 100R 220u 2885 2881 560p 47n 2887 560R 3901 2883 470n 2817 4u7 3n3 2814 3898 220R 3895 27K 470n 2884 +3.3V 3909 820R 3907 100R 3920 33K

25、 3897 2882 82p 3K3 3904 2K7 3899 3906 470R +5V_HF HFIN VrefCD10 100p 28152816 22n LDON to 3826,3827 VREF GE VDDA1 VRIN VSSA1 ISLICE LDON D1 D2 D3 D4 HFIN HFREF IREF CD_DA: 0V / CD_RW: 3V (A-D) 800mVpp TB = 0.5s/div EYE-PATTERN 1,8V 1,2V 2,4V 2,6V 0,65V CD PLAYABILITY CHECK 1-4 2 - 1 TECHNICAL SPECIF

26、ICATIONS SYSTEM Power supply . 120 V / 60 Hz Total output power.480W L, R Front. 50Wx2 at 1KHz, THD 1% L, R Rear . 50Wx2 at 1KHz, THD 1% Center .140Wx1 at 1KHz, THD 1% Subwoofer.140Wx1 at 63Hz, THD 1% AUX input sensitivity .? 550mV Channel Separation .? 40dB Distortion. 0.7% DVD Frequency response .

27、 100Hz-20kHz (2dB) Video output .1 VP-P Horizontal definition.? 500 (TV) Dimensions. . 232 (W) x 75.5 (H) x 227 (D) mm Weight . 1.75 kg AMPLIFIER Rated output power (THD = 10%) . . 4x75W (4?)+2x150W (8?) Frequency response . 100Hz-20kHz (2dB) S/N Ratio .? 60dB Loaded impedance .8 ?/4 ? Dimensions. .

28、 232 (W) x 75.5 (H) x 235 (D) mm Weight . 3.8kg TUNER FM Frequency range. 87.5-108 MHz FM Noise limit sensitivity. ? 20 V/M FM S/N.? 46dB AM Frequency range . 520-1710 kHz AM Noise limit sensitivity.? 3.0 mV/m AM S/N .? 40dB SPEAKERS Front Speakers System . 2-way shielded Impedance. 4 ? Speaker driv

29、ers.2x4” woofer, ribbon tw Dimensions (w x h x d) . . 223 mm x 1012 mm x 223 mm Weight. 12.95 kg Center Speaker System . 2-way shielded Impedance. 8 ? Speaker drivers. 4” woofer, 2” tw Dimensions (w x h x d) . . 392mm x 144 mm x 67 mm Weight. 2.45 kg Surround Speakers System . 2-way shielded Impedan

30、ce. 4 ? Speaker drivers. 1 x 3” woofer, Pieze Dimensions (w x h x d) . .144 mm x 250 mm x 50 mm Weight. 2.6 kg SUBWOOFER Subwoofer (not magnetically shielded design). . 8” Impedance. 8 ? Dimensions (w x h x d) . . 255 mm x 336 mm x 426 mm Weight. 12.6 kg REMOTE Distance.6m Angle . 300 Specifications

31、 subject to change without prior notice 2 - 2 SERVICE MEASUREMENT 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 Tuner FW Use a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from t

32、he pilottone (19kHz, 38kHz Ri=50 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 Faradays c

33、age. Use a bandpass filter (or at least a high pass filter with 250kHz) to eliminate hum (50Hz, 100Hz). RF Generator e.g. PM5326 Ri=50 L R LEVEL METER e.g. Sennheiser UPM550 with FF-filter S/N and distortion meter e.g. Sound Technology ST1700B DUT CDRECORDER Use Audio Signal Disc SBC429 4822 397 301

34、84 (replaces test disc 3) Use Universal Test Cassette Fe SBC420 4822 397 L R LEVEL METER e.g. Sennheiser UPM550 with FF-filter S/N and distortion e.g. Sound Technology ST1700B DUT LF Generator e.g. PM5110 Ri=50 DVD part A、 Remove bottom cover B、 Remove top cover and screws 310PTH （4PCS） 38FT （2PCS） A1、 Remove screws 2.57PWMTT（3PCS） ，2.65PWMTT（7PCS） B1.Remove screws 310FA（1PCS） C、Remove around of side panel and screws 36BTH（4PCS） 36FMTT（2PCS） C1、Remove screws 34FMTT（4PCS）