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1、3CD CHANGER HI-FI SYSTEM SERVICE MANUAL P/N : 3829RAP006BJULY, 2005 MODEL: LM-U2350A, LMS-U2350 LM-U4050A, LMS-U4050, LMS-U4050W LM-U5050A, LMS-U5050, LMS-U5050W, LMS-U5050S SERVICE MANUAL MODEL: LM-U2350A, LMS-U2350, LM-U4050A, LMS-U4050, LMS-U4050W, LM-U5050A, LMS-U5050, LMS-U5050W, LMS-U5050S CAU
2、TION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. RadioFans.CN 收音机爱 好者资料库 - 1-1 - CONTENTS SECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . .
3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 SECTION 2. ELECTRICAL SECTION ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . .
4、. . . . . . . . . . . . . . . . . . . . . . . . . 2-1 INTERNAL BLOCK DIAGRAM of ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 SC
5、HEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 WIREING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43 PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . .
6、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45 SECTION 3. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK) . . . . . . . . . . . . . . . . . . . . . . .
7、. . .3-3 TAPE DECK MECHANISM (A/R & A/S : LEFT A/S DECK) . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5 CD MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 SECTION 4. SPEAKER PART SPEAKER PART . . . . . . . . .
8、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 SECTION 5. REPLACEMENT PARTS LIST REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 RadioFans.CN 收音机爱 好者资料库 - 1-2 - SECTION 1.
9、GENERAL SERVICING PRECAUTIONS I NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact. 2. Repair notes 1) The pick-u
10、p incorporates a strong magnet, and so should never be brought close to magnetic materials. 2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunctio
11、n and/or damage to the printed-circuit board. 3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason the adjustment point and installation screws should absolutely never be touched. 4) Laser beams may damage the eyes! Absolutely never permit las
12、er beams to enter the eyes! Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged. 5) Cleaning the lens surface If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used for camera lens).The lens is held by
13、 a delicate spring. When cleaning the lens surface, therefore, a cotton swab should be used, taking care not to distort this. 6) Never attempt to disassemble the pick-up. Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do not use any other liqu
14、id cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up. Storage in conductive bagDrop impact NEVER look directly at the laser beam, and dont let contact fingers or other exposed skin. Magnet H
15、ow to hold the pick-up Conductive Sheet Cotton swab Pressure Pressure RadioFans.CN 收音机爱 好者资料库 - 1-3 - I NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode).These components are sensitive to, and easily
16、affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care. 2) The pick-up is composed of many optical components and other high-precision components. Care must be taken, therefore, to avoid repai
17、r or storage where the temperature of humidity is high, where strong magnet- ism is present, or where there is excessive dust. 2. Notes for repair 1) Before replacing a component part, first disconnect the power supply lead wire from the unit 2) All equipment, measuring instruments and tools must be
18、 grounded. 3) The workbench should be covered with a conductive sheet and grounded. When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is because there is the possibility of damage by static electricity.) 4) To prevent AC leakage, the metal part of th
19、e soldering iron should be grounded. 5) Workers should be grounded by an armband (1M ) 6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent sta- tic electricity changes in the clothing to escape from the armband. 7) The laser beam from the pic
20、k-up should NEVER be directly facing the eyes or bare skin. CLEARING MALFUNCTION You can reset your unit to initial status if malfunction occur(button malfunction, display, etc.). Using a pointed good conductor(such as driver), simply short the RESET jump wire on the inside of the volume knob for mo
21、re than 3 seconds. If you reset your unit, you must reenter all its settings(stations, clock, timer) NOTE: 1.To operate the RESET jump wire, pull the volume rotary knob and release it. 2. If you wish to operate the RESET jump wire, it is necessary to unplug the power cord. Resistor (1 Mohm) Conducti
22、ve Sheet Resistor (1 Mohm) Armband RESET jump wire VOLUME VOLUME KNOB DOWN UP - 1-4 - ESD PRECAUTIONS I Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devi
23、ces (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components.The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconduct
24、or component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to th
25、e unit under test. 2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive sur- face such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
26、 4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static can generate electrical charges sufficient to damage ESD devices. 5. Do not use freon-propelled chemicals.These can generate electrical charges sufficient to damage ESD devices. 6. Do not rem
27、ove a replacement ESD device from its protective package until immediately before you are ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive materials). 7. Immediately before removing the
28、 protective material from the leads of a replacement ESD device, touch the protective material to the chassis or circuit assembly into which the device will by installed. CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER SAFETY PRECAUTIONS. 8. Minimize bodily mot
29、ions when handing unpackaged replacement ESD devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can gen- erate static electricity sufficient to damage an ESD device). CAUTION. GRAPHIC SYMBOLS THE LIGHTNING FLASH
30、WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DAN- GEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT
31、 THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. - 1-5 - SPECIFICATIONS GeneralCD Tuner AM FM (MW) SpeakersSubwooferTAPE Power supplyRefer to the back panel of the unit. Power consumption200 W110 W Weight8.5 kg External dimensions (W x H x D)280 x 370 x 4
32、00 mm Frequency response 40 - 18000 Hz Signal-to-noise ratio 75 dB Dynamic range 70 dB Tuning Range87.5 - 108.0 MHz or 65 - 74 MHz, 87.5 - 108.0 MHz Intermediate Frequency10.7 MHz Signal to Noise Ratio60/55 dB Frequency Response60 - 10000 Hz Tuning Range522 - 1620 kHz or 520 - 1720 kHz Intermediate
33、Frequency450 kHz Signal to Noise Ratio30 dB Frequency Response120 - 2000 Hz Output PowerFront : 270 W + 270 W (LM-U5050 model only) 250 W + 250 W (LM-U4050/U2350 model only) Surround : 110 W + 110 W (LM-U5050 model only) Subwoofer : 350 W (LM-U5050/U4050 model only) T.H.D0.7% Frequency Response42 -
34、20000 Hz Signal-to-noise ratio80 dB Tape Speed3000 3 % (MTT-111. NORMAL-SPEED) Wow Flutter0.25 % (MTT -111, JIS-WTD) F.F/REW Time120 sec (C-60) Frequency Response125 - 8000 Hz Signal to Noise Ratio40 dB Channel Separation50 dB (P/B)/45 dB (R/P) Erase Ratio55dB (MTT-5511) TypeBass Reflex 3Way 3 Speak
35、er Bass Reflex 2Way 2Speaker Impedance6 24 Frequency Response55 - 20000 Hz60 - 20000 Hz Sound Pressure Level86 dB/W (1m)86 dB/W (1m) Rated Input Power270 W250 W 110 W Max. Input Power540 W500 W 220 W Net Dimensions (W x H x D)250 X 300 X 415 mm 187 X 258 X 415 mm Weight9.3 kg4.3 kg Speaker Name Subw
36、oofer (LMS-U5050W/U4050W) Type1 Way 1 Speaker Impedance6 Frequency Response45 - 15000 Hz Sound Pressure Level84 dB/W (1m) Rated Input Power350 W Max. Input Power700 W Net Dimensions (W x H x D)279 X 320 X 415 mm Weight10.0 kg LM-U5050 MODEL SECTION LM-U4050LM-U2350 Amp Front speaker (L/R) LMS-U5050
37、LMS-U4050/U2350 Surround speaker (L/R) LMS-U5050S Speaker Name - 1-6 - - 2-1 - SECTION 2. ELECTRICAL ELECTRICAL TROUBLESHOOTING GUIDE I SMPS POWER CIRCUIT P-SENS PART VKK CHECK SMPS ASSY CN902 7PIN 5.1V CHECK MAIN PCB CN710 7PIN 5.1V CHECK MAIN PCB CN304 5PIN 5.1VCHECK FRONT PN302 36PIN 5.1VCHECK FR
38、ONT IC306(RESET IC) STATE CHECK U-COM IC304 26PIN 5VCHECK SMPS TROUBLESHOOTING CONSULT CN710 CONNECTION STATE CHECK MAIN PCB PATTERN CUTTING AND SHORT CHECK IC306 INPUTVOLTAGE4V, OUTPUTVOLTAGE.2.1VSTATECHECK IC306 KIA7042 CHANGE NO NO NO YES YES YES YES YES CN710 10PIN DC -33V CHECK IC304 51PIN VOLT
39、AGE CHECK SMPS TROUBLESHOOTING CONSULT NO YES - 2-2 - MICOM (IC301) CHECK P-CTRL CHECK P-SENS CHECK RESET IC304 11 PIN CHECK (HIGH LOW HIGH) X301 VIBRATION SIGNAL CHECK IC301 CHANGE PN302 33 PIN P-CTRL CHECK (HIGH) CN710 5 PIN CHECK SMPS TROUBLESHOOTING CONSULT IC304 VDD(17,46,72,90) PIN VOLTAGE CHE
40、CK P-SENS TROUBLESHOOTING CONSULT Q303 STATE CHECK TR Q303 CHANGE SMPS TROUBLESHOOTING CONSULT MICOM IC304 STATE CHECK SMPS + MAIN BORD-TO-BORD CHECK MAIN CN710 6 PIN CHECK PN302 35 PIN +5.6V(MI) CHECK X301 CHANGE NO NO NO NO YES YES YES YES NO NO YES YES - 2-3 - MUTING TROUBLESHOOTING (MUTE STATE)
41、EXPEND IC(IC305/501/502) STATE Q752(A102) BASE HIGH Q701, Q751(D1302) BASE HIGH CHECK 16 PIN VDD VOLTAGE CHECK 3 EXP-CLK CHECK 2 EXP-DATA CHECK 4 PIN 15 PIN EACH PORT STATE CHECK EXPEND IC OK MUTE EXPEND IC(IC305) 5PIN HIGH STATE CHECK Q752(A102)STATE CHECK Q752(A102) FAULTY IS CHANGE EACH PART TR C
42、HANGE D332/D553/D551(1SS133) CHECK D332/D553/D551(1SS133) CHANGE PCB PATTERN CHECK PCB PATTERN CHECK MICOM (IC304) 4/84/85 PIN CHECK(CLK1/2/3) MICOM (IC304) 3 PIN CHECK EXPEND IC FAULTY IS CHANGE NO NO NO NO NO NO NO NO NO YES YES YES YES YES YES YES YES YES YES YES YES - 2-4 - SPECIFIC FUNCTION MOD
43、E HAS NO SOUND (NJW1190) IC601 IC201 INPUT CHECK(HEAD INPUT)ADECK 32,39 BDECK 34,37 DECK HEAD WIRE CONNECTION STATE CHECK IC502 10PIN(PB MUTE) STATE STATE CHECK IC502 4PIN(REC SW) LOW STATE REC Q212 (C) HIGH CHECK Q213 (C) LOW CHECK IC502 13 PIN REC-BAIS HIGH CHECK L203(4.7MH) COIL VIBRATION SIGNAL
44、CHECK IC601 7 /32 INPUT REC SIGNAL CHECK IC502 4PIN(REC SW) HIGH CHECK IC601(NJW1190) TROUBLESHOOTING CONSULT IC502 2 PIN/3 PIN CHECK(DATA/CL IC502 16 PIN VDD CHECK IC502 EXPEND IC CHANGE IC201 OUTPUT CHECK(5,26 PIN) IC601 3,36PIN INPUT SIGNAL CHECK IC601 17,22 PIN OUTPUT SIGNAL CHECK DECK OUTPUT 1)
45、 1) YES YES YES YES YES YES YES YES YES YES YES YES NO NO NO NO NO - 2-5 - AUX JK601 SIGNALINPUT CHECK IC601 5,34 PIN SIGNALINPUTCHECK IC601 17,22 PIN OUTPUT SIGNAL CHECK MAIN PCB PATTERN CHECK IC601(NJW1190) TROUBLESHOOTING CONSULT MAIN PCB PATTERN CHECK IC601(NJW1190) TROUBLESHOOTING CONSULT AUX O
46、UTPUT CD CN709 1,3PIN SIGNALCHECK CD TROUBLESHOOTINGCONSULT IC601 4,35PIN SIGNALINPUTCHECK IC601 17,22 PIN OUTPUT SIGNAL CHECK CD OUTPUT YES YES YES YES YES YES YES YES NO NO NO NO - 2-6 - TUNER TU101 3 /5 SIGNAL CHECK IC601 2,37 PIN SIGNALINPUTCHECK IC601 17,22 PIN OUTPUT SIGNAL CHECK TU101 2 PIN +
47、9V VOLTAGE CHECK TU101 6,7,8,9 PIN CHECK (PLL-CE, PLL-DI, CLK, PLL-DO) TUNER MODULE CHANGE TUNER OUTPUT MIC CN303 7 PIN MIC-SIGNAL CHECK IC601 44 PIN SIGNAL CHECK(OW601 PATTERN) IC601 17,22 PIN OUTPUT SIGNAL CHECK CN303 4 MIC-SENSE CHECK PN400 3 PIN +12VCHECK TR CHANGE MIC MUTE CHECK(Q409/ Q408) IC4
48、02 8 PIN SIGNAL INPUT CHECK PN400 9 VOL-INCHECK IC402 2 PIN SIGNAL INPUT CHECK PN400 10 PIN VOL-OUTCHECK MIC OUTPUT YES YES YES YES YES YES YES YES YES YES YES YES NO NO NO NO NO - 2-7 - IC601(NJW1190) TROUBLESHOOTING IC601 24PIN VOLTAGE INPUT CHECK IC601 19,20 SDA, SCA PULSE WAVE CHECK (VOL UP, DOW
49、N TURN CHECK) IC601 17.22 PIN WAVE OUTPUT CHECK IC601 OK FUNCTION INPUT PORT SIGNAL CHECK(NJW1190 TROUBLESHOOTING) SMPS VOLTAGE CHECK CONSULT IC301 10,8PIN CHECK IC301 TROUBLESHOOTING IC601 CHANGE NO NO NO YES YES YES YES YES YES YES YES YES AMP MODULE TROUBLESHOOTING IC501 9 PIN(AMP-PWR)HIGH CHECK EXPEND IC TROUBLESHOOTING CONSULT PROTECTION HIGH SMPS VOLTAGE AND AMP ON/ OFF STATE CHECK AMP MODULE CHECK : MOS FET BOTH ARE READ SHORT AMP DEAD AMP MODULE CHANGE IC305 9 PIN(AMP-PWR) HIGH CHECK IC701 11 PIN A
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