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1、MODEL : LX-U150X(LXU-150)SERVICE MANUAL MICRO COMPONENT SYSTEM SERVICE MANUAL MODEL : LX-U150X (LXS-U150) RadioFans.CN 收音机爱 好者资料库 - 1-1 - SECTION 1. GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . .
2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 SECTION 2. ELECTRICAL ADJUSTMENTS . . . . . . . . . . . . . .
3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 WAVEFORMS OF MAJOR CHECK POINT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、 . . . . . . . . . . . . 2-5 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25 WIRING DIAGRAM. .
5、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 INTERNAL BLOCK DIAGRAM OF ICs . . . . . . . . . . . . . . . . . . . .
6、 . . . . . . . . . . . . . . . . . . . . 2-43 SECTION 3. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 SECTION 4. SPEAKER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7、. 4-1 SECTION 5. REPLACEMENT PARTS LIST REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 CONTENTS RadioFans.CN 收音机爱 好者资料库 - 1-2 - NOTES REGARDING HANDLING OF THE PICK-UP 1.Notes for transport and storage 1) The pick-up should al
8、ways 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-up incorporates a strong magnet, and so should never be brought close to magnetic materials. 2) The pick-up should always be handled
9、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 malfunction and/or damage to the printed-circuit board. 3) Each and every pick-up is already individually adjusted to a high degree of precisi
10、on, 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 laser 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)
11、 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 a delicate spring. When cleaning the lens surface, therefore, a cotton swab should be used, taking care not to distort this. 6) Ne
12、ver 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 liquid 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 al
13、cohol to get inside the pick-up. SERVICING PRECAUTIONS SECTION 1. GENERAL RadioFans.CN 收音机爱 好者资料库 - 1-3 - 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 easil
14、y 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 rep
15、air or storage where the temperature of humidity is high, where strong mag- netism 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 b
16、e 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 t
17、he 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 static electricity changes in the clothing to escape from the armband. 7) The laser beam from the pick-
18、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 more
19、 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. - 1-4 - Electrostatically S
20、ensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components com- monly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated cir- cuits and some field-effect transistors and semiconductor
21、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 semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known e
22、arth ground. Alternatively, obtain and wear a com- mercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ESD devices, place the assembly on a condu
23、ctive 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. 4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static can gen
24、erate 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 remove a replacement ESD device from its protective package until immediately before you are ready to install it. (Mos
25、t replacement ESD devices are packaged with leads electrically shorted together by conduc- tive foam, aluminum foil or comparable conductive materials). 7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the protective material to the chassis or
26、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 motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion such as the brushing together of
27、 your clothes fabric or the lifting of your foot from a carpeted floor can gener- ate static electricity sufficient to damage an ESD device). CAUTION. GRAPHIC SYMBOLS THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE
28、 OF UNINSULATED “DANGER- OUS 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 THE SER- VICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERA- TURE. ESD PRECAUTIONS
29、 - 1-5 - SPECIFICATIONS SECTIONMODELLX-U150A/D/X Power supplyRefer to the back panel of the unit General Power consumption20W Mass3kg External dimensions(WxHxD)146x238x251mm Frequency Response40 18000Hz CDSignal-to-noise ratio60dB Dynamic Range60dB Tuning Range87.5 108.0MHz or 65 74MHz, 87.5 108.0MH
30、z FM Intermediate Frequency10.7MHz Signal-to-noise ratio55/50dB(Mono/Stereo) Frequncy Response60 1000Hz Tuning Range522 1620kHz or 520 1720kHz AM Intermediate Frequency450kHz Signal-to-noise ratio35dB Frequency Response100 1800Hz Output Power5W + 5W AMP T.H.D0.5% Frequncy Response60 20000Hz Signal-t
31、o-noise ratio60dB Tape Speed4.75cm/sec Wow Flutter0.3%(MTT-111, JIS-WTD) F.F/REW time120sec(C-60) TAPEFrequency Response250 8000 Hz Signal-to-noise ratio40dB(P/B)/38dB(R/P) Channel Separation32dB(P/B)/30dB(R/P) Erase Ratio50dB(MTT-5511) MODELLXS-U150 Type1Way 1 Speaker Impedance4 Frequency Response1
32、00 18000Hz SPEAKERSound Pressure Level86dB/W(1m) Rated Input Power5W Max.Input Power10W Net Dimension(WxHxD)146x238x185mm Net weight1.4kg TUNER NOTE : Specification are subject to change without notice in the course of product improvement. - 1-6 - MEMO This set has been aligned at the factory and no
33、rmally will not require further adjustment. As a result, it is not recommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tampers with the adjustment, realignment may be necessary. IMPORTANT 1. Check Power-source voltage. 2. Set the function switch to
34、band being aligned. 3. Turn volume control to minimum unless otherwise noted. 4. Connect low side of signal source and output indicator to chassis ground unless otherwise specified. 5. Keep the signal input as low as possible to avoid AGC and AC action. TAPE DECK ADJUSTMENT TUNER ADJUSTMENT ItemTest
35、 FrequencyTest PointAdjustmentAdjust forRemark DC VoltageFM 98MHz 60dBuVOscilloscopeL1040V 50mVR145 AM IFAM 603kHz 80dBuSpeaker outL103MaximumMaximum Waveform - 2-1 - ADJUSTMENTS SECTION 2. ELECTRICAL AzimuthMTT-114Speaker out Azimuth Maximum Screw Bias FrequencyTape RecTape RecL20165V 5kHz ItemTest
36、 TapeTest PointAdjustmentAdjust forRemark 1 2 1 2 - 2-2 - PIN?9?:?FSEQ PIN?8?:?CE PIN?7?:?CL PIN?9?:?FSEQ PIN?8?:?CE PIN?7?:?CL PIN?6?:?DI PIN?6?:?DO PIN?4?:?RESET PIN?14?:?WRQ PIN?6?:?DI PIN?6?:?DO PIN 4?:?RESET PIN?14?:?WRQ #1. MICOM INTERFACE WAVEFORM (PN805 PIN 3, 4, 5, 6) during power on #1. MI
37、COM INTERFACE WAVEFORM (PN805 PIN 3, 4, 5, 6) during normal play #1. MICOM INTERFACE WAVEFORM (PN805 PIN 7, 8, 9) during power on #1. MICOM INTERFACE WAVEFORM (PN805 PIN 7, 8, 9) during normal play WAVEFORMS OF MAJOR CHECK POINT - 2-3 - PIN 25 : FAO PIN 16 : FA+ PIN 25 : FAO PIN 16 : FA+ PIN 5 : SLI
38、N PIN 13 : SL+ PIN 5 : SLIN PIN 13 : SL+ #2. SLED DRIVE AND MOTOR WAVEFORM (IC802 PIN 5, 13) when focus search #2. SLED DRIVE AND MOTOR WAVEFORM (IC802 PIN 5, 13) during normal play #3. FOCUS DRIVE AND MOTOR WAVEFORM (IC802 PIN 25, IC802 PIN 16) When focus search failed or there is no disc on tray #
39、3. FOCUS DRIVE AND MOTOR WAVEFORM (IC802 PIN 25, IC802 PIN 16) There is disc on tray and focus search success - 2-4 - PIN 2 : RFOUT PIN 10 : FE PIN 16 : TE PIN 22 : TAO PIN 17 : TA+ PIN 6 : SPIN PIN 11 : SP+ #5. TRACK DRIVE AND MOTOR WAVEFORM (IC802 PIN 22 , IC802 PIN 17) during normal play #4. SPIN
40、DLE DRIVE AND MOTOR WAVEFORM (IC802 PIN 6, 11) when TOC reading #6. RF, FOCUS AND TRACKING ERROR WAVEFORM (IC801 PIN 2, 10, 16) during normal play - 2-5 - AUDIO PART TROUBLESHOOTING P-SENS PART Does +5V appear at ZD902? YES NO POWER CIRCUIT Check the DC output Of C914(+) Check the DC 9V Output of IC
41、903 END NO YES NO NO YES YES NO YES NO YES NO YES NO YESNO YES IC300 PIN 26 Check Check the Fuse Check the DC 6.02V Output of IC902 Check the 5V of Q9011 C (CD FUNCTION) Replace the fuse Check the DC voltage of CN901 Pin3,4 Replace the Transformer Replace the Transformer Replace the D908,909 910,911
42、 Check the DC voltage of CN901 Pin 8 , Pin 9 Replace the D908,909, 910,911 Replace the D902,903 Check the High of Q902 B Replace the Q901 Check the High Of CN601 pin7 D920 , CN901 Check - 2-6 - MUTING CIRCUIT(MUTE) YES NO NO NO AUDIO ABNORMAL YES NO YES NO YES NO YES NO YES Check the LOW of Q701 Q90
43、1, C Check the Output of IC701 Pin 8,12 Check the waveform Of D920(+) Replace ZD902 Check the Signal Output of IC701 pin2,4 Check the DC 10V of IC601 Pin1 Check the DC 9V of IC903 Check the Power Circuit Check the speaker connection Check the High of IC701 pin5 Check the FUNC input Normal Does High
44、appear at Q701, Q702 B MUTE Replace the TR - 2-7 - FUNCTION MODE AUDIO ABNORMAL NO YES NO NO YES NO YES NO YES Check the signal input of IC601 pin3, 26 TAPE Check the signal input of IC601 pin4, 25 Check the signal input of IC601 pin6, 23 Check the signal input of IC601 pin5, 24 IC601 pin12, 17 outp
45、ut IC601 pin12, 17 output IC601 pin12, 17 output CN201, PN201 check IC201 pin4, 11 check Check signal input JK602 Check the signal input of CN601 pin 1, 3 and refer to CD troubleshooting IC102 pin17, 18 check CD TUNER AUX IC601 pin12, 17 output - 2-8 - IC301 TROUBLESHOOTING NO YES IC601 TROUBLESHOOT
46、ING NO YES NO YES NO YES NO YES NO YES NO YES NO YES Check the power supplying IC300 pin17,54,90 Check the P-SENS HIGH of IC300 pin26 Check the oscillation of X301 When power supplying to IC300 pin11. (Low High) Refer to Power Circuit Troubleshooting Check the P-SENS Replace the X301 Check the RESET
47、 circuit Check the power supplying To IC601 pin1 Check the CLK Data of IC601 pin14, 15 Check the Control function END Refer to Power Circuit Troubleshooting Check the Data of IC300 pin6, 7 (CD TAPE FUNCTION) Replace the IC201 Check the pattern of IC300, IC601 Refer to IC300 Troubleshooting Replace t
48、he IC300 - 2-9 - IC103 TROUBLESHOOTING NO YES NO YES NO YES AM COIL TROUBLESHOOTING YES NO YES NO YES Check the Power input of IC103 Pin 17 X104 oscillation Check CE,DI,DO,CLK Check the Operation END Check the High L102 Pin 2 Replace X104 D107 ,D108 ,IC902 Check CE : Chip Enable DI : Data input (fro
49、m Micom) DO : Data output (to Micom) CLK : Tuner mode clock Check the oscillation the L102 Pin 13 Refer to IC103 Troubleshooting Check the IC102 Troubleshooting Replace to L102 - 2-10 - FM(TU101) TROUBLESHOOTING YES IC 102 TROUBLESHOOTING NO NO YES YES NO NO YES NO YES NO YES YES YES NO YES YES NO Check the 10V input of TU101 Pin 6 Check the High of TU101 Pin5 Check the Power input of IC102 pin8 Check the 10V of Q102 E Check the OSC waveform of TU101 pin8 Refer to IC102 Troubleshooting Check the waveform of
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