Philips-MCB-275-Service-Manual(1) 电路图 维修手册.pdf

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1、CLASS 1 LASER PRODUCT MCB275/05 Copyright 2009 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

2、 without the prior permission of Philips. Published by SL0913 Service Audio Printed in The Netherlands Subject to modifi cati GB3141 785 31774 Micro System TABLE OF CONTENTS Page Location of PC Boards & Versions Variation .1-2 Specifi cations .1-3 Measurement Setup .1-4 Service Aids, Safety Instruct

3、ion, etc .1-5 CD Playability Check .1-6 to 1-8 Disassembly Instructions & Service positions .2 Service Test Program .3-1 Set Block Diagram .4-1 Set Wiring Diagram .5-1 Main Board .6 Key & LCD Board .7 CD & MCU Board .8 Mechanical Exploded View & Parts List .9 Revision list .10 Version 1.4 RadioFans.

4、CN 收音机爱 好者资料库 1-2 xn i RDC / n i xuA Line Out Video Out Surround Out Subwoofer Out Power Booster Out Digital Out Digital in Matrix Surround xSDR xsweN Dolby Pro Logic (DPL) Incredible Surround Karaoke Features Voltage Selector ECO Power Standby (LCD Display Off)x ECO6 Tuner Board - Systems Non-Cenel

5、ec xECO6 Tuner Board - Systems Cenelec USB Direct VERSION VARIATIONS: Type /Versions: MCB275 Features & Board in used: /05 x VERSION VARIATIONS RadioFans.CN 收音机爱 好者资料库 1-3 SPECIFICATIONS GENERAL: Mains voltage : 127/240V -15%+10% Switchable for /98 120V 10% for /37 230V 10% for /05/12 Mains frequenc

6、y:50/60Hz Clock accuracy: 4 seconds per day Dimension centre unit :194(W)x269(H)x90(D) (mm) Power consumption Active: 20W Standby : 5.5W (DEMO mode) ECO Power Standby: 0.5W for /05/12/37 TUNER: FM Tuning range: 87.5-108MHz Grid: 50kHz for /98/12/05 100kHz for /98/55/37 IF frequency: 10.7MHz 20kHz Ae

7、rial input: 75 coaxial /05/12/98 300 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 for /05/12/55/98 530-1700kHz for /37/98 Grid: 9kHz for /05/12/55/98 10kHz for /37/98 IF frequency: 450kHz

8、1kHz Aerial input: Frame aerial 18.1H Sensitivity at 26dB S/N: 18dB IF rejection: 45dB Image rejection: 28dB Distortion at RF=50mV, M=80%: 76dB Distortion at 1kHz: 0.02% Channel unbalance (-40dB): 30dB Emphasis: 15/50 S (switched automatically by CD10) THD Noise(1kHz,500mW): 60B 80dB : 2 x 4.5W (4,

9、1kHz, 10% THD) /98 : 2 x 4.5W (FTC Power, 4, 1kHz, 10% THD 63Hz-12.5kHz) /37 Dynamic Bass Boost (DBB): ON / OFF USB : Host Signal/Noise ratio (unw.): 65dB Volume attenuation(1kHz): 60dB ID3: V1 tag/V2 2.0/V2 3.0 MP3 CD WMA: MP3: MPEG 1 (ISO/IEC 11172-3) Layer3 Language Support: English RadioFans.CN

10、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 LEVEL METER e.g. Sennheiser UPM550 with FF- filter S/N and distortion mete e.g. Sound Technology ST1700B L R DUT or Universal Test Cassette FeSBC420 4822 397 30071 LEVEL METER e.g. Sennheiser UPM5

11、50 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 LF Voltmeter e.g. PM2534 DUT S/N and distortion meter e.g. Sound Technology ST1700B Frame aerial e.g. 7122

12、 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 eliminate hum (50Hz, 100Hz). RF Generator e.g. PM5326 Ri=50 Bandpass 250Hz- 15kHz e.g. 7122 707 48001 LF

13、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 (19kHz, 38kHz). Ri=50 Tuner FM MEASUREMENT SETUP 1-5 Service Tools: Universal Torx driver holder .4822 395

14、 91019 Torx bit T10 150mm .4822 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

15、 .4822 395 10216 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 as the mass of the set via a wrist w

16、rap 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 marked by the symbol !. Lead free S

17、et remains 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 Driv

18、e Laser 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 c

19、leaning 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 1-6 1 PLAYABILITY CHECK For sets which are compatible with CD-RW discs use CD-RW Printed Audio Disc.7104 099 96611 TR 3 (Fingerprin

20、t) 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 (600 Black dot) m

21、aximum 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 is proposed to

22、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 lens cle

23、aning (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 cleaning CD, press

24、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”, available with

25、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 cleaning must be in th

26、e 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 1-7 5 EYE-PATTERN SIGNAL JITTER MEASUREMENT Measure the signal on the in

27、put 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 amplitude decreases

28、 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 VAMxxxx: 150-230mV3

29、50mV 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 playability of some

30、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 A-D should read

31、 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 Laser power con

32、trol 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 Drive detection

33、 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 3897 2882 82p 3

34、K3 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 1-8 2-12-1 DISMANTLING INSTRUCTIONS 1) Pre

35、ss the 2 juts and pull out the Stand as shown in figure 1. 2) Loosen 5 screws A and 6 screws B to remove the Rear Cabinet as shown in figure 2. 3) Loosen 3 screws C to remove the SP & ANT Jack Board as shown in figure 3. 4) Loosen 5 screws D to remove the Power Module as shown in figure 3. Dismantli

36、ng the Rear Portion and PCBs Figure 3 Figure 2 Dismantling the Rear Portion and PCBs 5) Loosen 2 screws E to remove the Bracket Jack Board as shown in Figure 4. 6) Loosen 3 screws F to remove the Main Board as shown in figure 5. Figure 4 Figure 5 Figure 1 Dismantling of the Display Lens & the Volume

37、 knob 1) Use a flat head screw driver to give a push in the direction as shown in figure 6. Figure 6 2) Place two small screw drivers in between the front cabinet & knob to give more leverage in pulling out the Volume Knob as shown in figure 7. Figure 7 2-22-2 Service pos A Note: After re-assembly,

38、it is very important to ensure all wires are routed properly to ensure that they do not touch/obstruct all moving parts. Dismantling of the CD Module & CD Door Carrier 1) Loosen 5 screws J mounting the Key Board to the Front Cabinet to remove the Key Board as shown in figure 8. 2) Loosen 4 screws H

39、and 3 screws G to CD Module as shown in figure 8. 3) Loosen 2 screws I to remove the Servo Motor Mechanism as shown in figure 8. Figure 8 4) Loosen 4 screws K to remove the Right CD Door Carrier and 4 screws L to remove the Left CD Door Carrier as shown in figure 9. Figure 9 Service pos B 3-13-1 SER

40、VICE TEST PROGRAM Various other Tests Activated withACTIONTEST Disconnect mains cord LEAVE SERVICE TEST PROGRAM 9 to Exit .MORPEE eht ot tne s eb l l iw nre t t ap t se t ARAELC MORPEE EEP CLR is displayed while the erase processing. Caution! All presets from the customer will be lost! Y N Y N N PRE

41、V Button pressed? PREV Button pressed? PREV Button pressed? DISPLAY TEST Display shows Figure 1 All display flags on. Display shows alternate segment display from SEG0 to SEG64. Y Y N 9 Button pressed? No Display shows Y N Y N N DBB Button pressed? DBB Button pressed? DBB Button pressed? ADC TEST Di

42、splay shows ADC1 Value for ADC1 Display shows ADC2 Value for ADC2 Y Y N 9 Button pressed? ADC Test is used for checking the ADC inputs to the microprocessor. The display shows an ADC value between 0 and 255 for an input signal between 0 and 5V. Display shows ADC3 Value for ADC3 (Input Line - Door sw

43、itch status) Y Y N N Display shows Table 1 KEY TEST Button pressed? 9 Button pressed? Display shows the MCU version “ V. yy ” (Main menu) V refers to Version yy refers to Software version number of the uProcessor (counting up from 01 to 99) To enter Service Testprogram hold DBB & Source buttons depr

44、essed for 3 sec. at USB mode (no USB). *Door switch is ignored CD door can be opened. (Input Line - Rotary volume) (Input Line - ioNTC Heat detection for transformer) Y N DBB Button pressed? Display shows ADC0 Value for ADC0 (Input Line - For key scanning) N DBB Button pressed? Y Display shows ADC4

45、Value for ADC4 (Input Line - Version detection) Figure 1 PROGRAM NEXT Key test table KeyNr Set key KeyNr Set key KeyNr Set key 0 CD 10 RDS 20 PROGRAM 1 AUX 11 21 SHUFFLE 2 TUNER 12 CLOCK/DISPLAY22 NULL 3 SOURCE 13 ALBUM+ SLEEP 4 STANDBY/ON 14 ALBUM - TIMER 5OPEN/CLOSE15SKIP PREV 25 DBB 6VOLUME DOWN 16 SKIP NEXT 26 DSC 7 VOLUME UP 17 NULL 27 MUTE 8 NULL18 NULL 28 USB 9 NULL19 REPEAT 23 24 Table 1 4-14-1 SET BLOCK DIAGRAM SET WIRING DIAGRAM 5-15-1 6-16-1 PCB LAYOUT - MAIN BOARD (TOP VIEW) PCB LAYOUT - MAIN BOARD (BOTTOM VIEW) 6-26-2 6-3 6-3 CIRCUIT DIAG