LG-LPCBM340-pr-sm 维修电路原理图.pdf

上传人：cc518

文档编号：154059

上传时间：2022-07-09

格式：PDF

页数：36

大小：4.23MB

《LG-LPCBM340-pr-sm 维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《LG-LPCBM340-pr-sm 维修电路原理图.pdf（36页珍藏版）》请在收音机爱好者资料库上搜索。

1、- 1-1 -CONTENTS SECTION 1. GENERAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 SECTION 2. ELECTRICAL ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、. . . . . . 2-1 TROUBLESHOOTING GUDIE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 IC VOLTAGE SHEET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 BLOCK DIAGRAM . . . . . . . . . . . . .

3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . 2-31 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43 SECTION 3. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 SECTION 4. REPLACEMENT PARTS LIST . . . .

5、. . . . . . . . . . . . . . . . . . . . . . . 4-1RadioFans.CN 收音机爱好者资料库- 1-2 -SECTION 1. GENERAL SPECIFICATIONSMODELLPC-LM340A/X, LPC-BM340A/XSECTIONLPC-LM345A/X, LPC-BM345A/XPower supplyRefer to the back panel of the unit.Power consumption13WMass3.24kgExternal dimensions (W x H x D)360 x 170 x 260

6、mmOutput Power 2.5W x 2Speakers8 x 2Battery OperationDC 12V, eight “C”(R14) and four “AA”(R6) batteries (not supplied)Fequency response100 18000HzSignal-to-noise ratio59dBT.H.D0.7%Tuning Range 6574MHz, 87.5108MHz or 87.5 108MHzIntermediate Frequency 10.7MHzAntennaTelescopic antennaTuning Range522161

7、1kHz or 530 1610kHzIntermediate Frequency450kHzAntennaFerrite bar antennaRecording System4 Tracks 2 channel stereoFrequency Response125 8000HzSignal to Noise Ratio40/45dB (REC/PLAY)GeneralCDTAPETUNERAM (MW)FM* Designs and specifications are subject to change without notice.Remote Control Operation R

8、angePoint the remote control at the remote sensor and press the buttons.Distance: About 23 ft (7 m)from the front of the remote sensor.Angle: About 30 in each direction of the front of the remote sensor.RadioFans.CN 收音机爱好者资料库- 2-1 -SECTION 2. ELECTRICAL ADJUSTMENTS1.TAPE DECK ADJUSTMENTDECK MODE TE

9、ST TAPE TEST POINTADJUSTMENTADJUST FORDECKADJUSTPLAY BACKMTT-114SPEAKER Output Azimuth adjusting screwSTOPFWD: LEFTL/R MaximumRVSFWD: RIGHTRVS: LEFT2. RECORD BIAS ADJUSTMENTDECK MODE TEST TAPETEST POINTADJUSTMENTDECKADJUST FORREC MODEMTT-5511C241L201AUTO-RVS85kHz5kHzAUTO-STOP60kHz5kHz- 2-2 - TROUBLE

10、SHOOTING GUIDE1. CD- 2-3 - OPEN COLOSE NGCONNECTOR LOCKING CHECKDEFECTIVE MAINPOWER SUPPLYCHECK THE(SW502)DEFECTIVE IC503DEFECTIVE MICOMMECHANISMCHECK LOING CHECK (CN605, CN302)CHECK VOLTAGE CHANGE LO+, LO- OF IC503CHECK POWER SUPPLY CIRCUIT (CN603, CN302)PN508 PIN8 = 6.2V, PIN7 = 5V, PN507 PIN1=5VY

11、ESYESYESNONONONO- 2-4 - “READING” DISPLAY CHECK (=ONLY “CD” DISPLAY)- 2-5 - READING OK CHECK (= “ NO DISC ” DISPLAY)CONNECTOR LOCKINGCHECK(PN501 ,PN503)DOES SLED MOVE?DOSE LENSE MOVE?(UP&DOWN)DOSE LASER LIGHT?DOES SPINDLE ROTATE?IS READING OK?CHECK PN501 PIN 14,15(TA+,TA-)CHECK PN503 PIN5.6(SP+,SP-)

12、CHECK PN501 PIN 10(LD)CHECK PN501 PIN 15, 16(FA-,FA+)CHECK PN503 PIN3, 4(SL+,SL-)DEFECTIVE PICKUP ORIC503 OR IC501 OR IC502DEFECTIVE PICKUP ORIC503 OR IC501DEFECTIVE PICKUP ORIC502DEFECTIVE PICKUP ORIC503DEFECTIVE PICKUP ORIC503 OR IC501 OR IC502ABCDENONONONONONONONONONOYESYESYESYESYES- 2-6 - READIN

13、G OK CHECK #A(=“NO DISC” DISPLAY)DOSE SL+ WAVEFORMAPPEAR AT(IC503 PIN 14 ANDPN503 PIN3)WAVEFORM #2SLED MOTOR WAVEDOSE SLIN WAVEFORMAPPEAR AT (IC503 PIN5)WAVEFORM #2 SLEDDRIVE WAVECHECK PN503 CONNECTOR LINEDEFECTIVE IC501DEFECTIVE IC503DEFECTIVE PN503CONNECTORDEFECTIVE PICUPSLED MOTORAYESNONONONONO-

14、2-7 - READING OK CHECK #B(=“NO DISC” DISPLAY)DOSE FA+ WAVEFORMAPPEAR AT(IC503 PIN 1 5 ANDPN50 1 PIN 16)WAVEFORM #3FOCUS COIL DRIVE WAVEDOSE FAIN WAVEFORMAPPEAR AT (IC503 PIN26)WAVEFORM #3 FOCUSDRIVE WAVECHECK PN50 1 CONNECTOR LINEDEFECTIVE IC50 1DEFECTIVE IC503DEFECTIVE PN501CONNECTORDEFECTIVE PICUP

15、FOCUS ACTUATORBYESNONONONONO- 2-8 - READING OK CHECK #C(=“NO DISC” DISPLAY)IC ?V APPLIED TO PIN 10 OF PN501LASER SUPPLY VOLTAGE CHECKIS 3.3V APPLIED TOPIN3 OF IC502RF IC SUPPLY VOLTAGECHECKCHECK PN501 CONNECTOR LINE DEFECTIVE IC501IS 2.0V PIC2 OF IC502LASER CONTROLVOLTAGE CHECKDEFECTIVE IC501DEFECTI

16、VE IC503DEFECTIVE PICUPFOCUS ACTUATORDEFECTIVE PN501CONNECTORCYESYESNONONONONONO- 2-9 - READING OK CHECK #D(=“NO DISC” DISPLAY)DEFECTIVE IC501DEFECTIVE IC503DEFECTIVE PN503CONNECTORDEFECTIVE PICUPSPINDLE MOTOORCHECK PN503 CONNECTOR LINEDNONONONODOSE SP+ WAVEFORMAPPEAR AT(IC503 PIN 12 ANDPN503 PIN6)W

17、AVEFORM #4SPINDLE MOTOR DRIVE WAVEDOSE SPIN WAVEFORMAPPEAR AT (IC503 PIN6)WAVEFORM #4SPINDLE DRIVE WAVEYESYES- 2-10 - READING OK CHECK #E(=“NO DISC” DISPLAY)EDOSE TA+ WAVEFORMAPPEAR AT(IC503 PIN17 ANDPN503 PIN 15)WAVEFORM #5TRACKING COIL DRIVE WAVEDOSE TAIN WAVEFORMAPPEAR AT (IC503 PIN23)WAVEFORM #5

18、TRACKING DRIVE WAVECHECK PN503 CONNECTOR LINEDEFECTIVE IC501DEFECTIVE IC503DEFECTIVE PN503CONNECTORDEFECTIVE PICKUP ORIC502DEFECTIVE PN503CONNECTORDEFECTIVE PICUPSPINDLE MOTOORDOSE ARF SIGNAL APPEAR?(IC502 PORT8)WAVEFORM#6DOSE FE, TE SIGNAL APPEAR?(IC502 PORT FE:23,RE:21)WAVEFORM#6NONONONONONONOYESY

19、ESYES- 2-11 -2. MAIN POWERMain Power input (AC-cord in)LCD Display “Hello”Check the Voltage-selector 110V/230V(Duble Voltage only)Check the DC out of C813(+)Check the FuseReplace the FuseReplace the ZD805Replace the Q810Check the ZD805 of +13VReplace the IC801Check the D602, D604, D605Check the ZD80

20、3, Q807Check the Q601Replace the X601, X602Check the Q810 “E ”DC Power-outputCheck theD901,D902,D903,D904Check the DC power output of IC801pin3 +5.2VCheck the power-output IC601pin17,54,90?Check the DC +5.2V output of Q808 “C”Check the Reset of IC601 pin11, Q601 “C”Check the Oscillation of X601,X602

21、Replace the IC601NONONONONONONONONOYESYESYESYESYESYESYESYESYESYESYES- 2-12 -3. MUTING CIRCUIT(MUTE)4. FUNCTION MODE AUDIO ABNORMALDose “ HIGH ” appear atQ305, Q306 “ B ”Check the “LOW ” of Q305, Q306 “E ”MUTETAPECDTUNERCheck the signal input of IC301 pin2, 5Check the signal input of IC301 pin1, 6Che

22、ck the signal input of IC301 pin3,4Refer to “Tuner Pack Trouble Shooting ”Check the signal input of PN302 “R-CH ”“L-CH”Refer to “TAPE Trouble Shooting ”Check the “HIGH” of theIC601 pin9Check the patternReplace the Q305, Q306Check the IC601NONONOYESYESYESYESYESYESYESYES- 2-13 -5. IC301 Check the IC60

23、1 Function SelectorCheck the PatternReplace the IC301Check the IC601ENDCheck the Power supplying to IC301 pin24Check the +8.2V DC output ZD302Check the Data ofIC601 pin 6, 7(CD TAPE Function)Check the CLK Data of IC301 pin 21,22NONONONOYESYESYESYES- 2-14 -6.TUNER PACK Check the Tuner Power of PN101

24、“Tu- B+”Check the DC output of“HIGH” Q818 “C”Check the “high”Q819 “B ”Check the DC output Q802 “E”, patternReplace Tuner packCE : Chip EmableDI : Data Input(From u-com)DO : Data Output(to u-com)CLK :Tuner Mode ClockCheck the PN301 of CE, DI, DO, CLK (PLL)Is the normal?ENDYESYESYESYESNONONO- 2-15 -7.

25、TAPE DECKCheck the power supplying to IC201 pin18Check the signal output ofIC201 pin5,20Check the “LOW” of Q210, 211 “B ”Check the DC output Q815 “C”Check the “high”IC601 pin92Replace the Deck MechaCheck the patternCheck the Deck MechaReplace the IC201YESYESYESYESNONONONOPlay- 2-16 -RECCheck signal

26、supplied to IC201 pin 11, 14Check the “LOW ” of Q208, 209 ”B”Check the “LOW ” ofIC601 pin32Check the Oscillation of L201 pin1, 3Replace the deckCheck the power supplying to C245(+)Check the “LOW ”Q813 “C”Check the IC601pin87Check the DC outputof Q811 “C”Check the Oscillation ofQ202 “E ”Check the sig

27、nal of R239, R240Check the patternCheck the 0.6V of Q203 “B ”Replace the L201Replace Q208, 209YESYESYESYESYESYESYESNONONONONONONO- 2-17 - VOLTAGE SHEET 1 2 3 4 5 6 7 8 91011120V 0V 1.3V 1.3V 1.4V 1.7V 0V 4.5V 2V 1.3V 0V 0V13 14 15 16 17 18 19 20 21 22 23 240.8V 0V 1.3V 2V 1.4V 7.8V 7.5V 4V 1.3V 1.3V

28、 0V 0V1 2 3 4 5 6 7 80V 0V 0V 5V 0V 7.8V0V 0V IC2011 2 3 4 5 6 7 8 91011123.9V 4.1V 4.1V 4.1V 4.1V 3.9V 4.1V 4.1V 4.1V 4.1V 4.1V 4.1V13 14 15 16 17 18 19 20 21 2223 244.1V 4.1V 4.1V 0V 0V 4.1V 4.1V 0V 0V 0V 4.1V8.2V25 26 27 280V 3.4V 3.4V 4.1V IC3011 2 3 4 5 6 7 8 91011120V 0V 0V 0V 3.3V 0V 0V 0V 0V

29、 0V 0V 0V13 14 15 16 17 18 19 20 21 22 23 240V 3.3V 3.3V 0V 0V 0V 0V 0V0V 0V 0V 0V25 26 27 28 29 30 31 32 33 34 35 360V 0V 0V 1.5V 1.5V 0V 0V 0V 0V 0V 1.6V 0V37 38 39 40 41 4243 44 45 46 47 481.7V 0V 3.3V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 3.2V0V 0V49 50 51 52 53 54 55 56 57 58 59 600V 3.2V 0.8V 1.6V 1.6

30、V 3.2V 1.4V 1.4V 0V 1.6V 0V 1.6V61 62 63 64 65 66 67 68 69 70 71 723.2V 0V 0V 0V 0V 0V 1.5V 0V0V 0V 0V 2.5V73 74 75 76 77 78 79 80 81 82 83 840.25V 2.7V 0.25V 0V 0V 0V 1.6V 0V 2.7V 3.2V 0V 1.2V85 86 87 88 89 90 91 92 93 94 95 961.6V 3.2V 1.6V 0V 0V 0V 0V 0V 0V 0V 0V 0V97 98 99 1000V 3.2V 0V 0V IC501

31、1 2 3 4 5 6 7 8 910111210.7V 6.1V 11V 5.8V 0.4V 0V 0V 0.7V 0V 9.1V 10.8V 12V IC302 IC202- 2-18 -1 2 3 4 5 6 7 8 91011120V 2.1V 3.2V 0V 2.3V2V 1.6V 1.5V 1.5V 1.5V2V 1V13 14 15 16 17 18 19 20 2122 23 240V 0V 0V 3.2V 0V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 0V25 26 2728 29 30 31 321.6V 1.6V 1.6V 1.6V 1.6V 1.6V

32、 1.6V 1.6V IC5021 2 3 4 5 6 7 8 91011120V 0V 1.2V 3.5V 1.6V 1.5V 6.3V6.3V 0V 0V 3.6V 3V13 14 15 16 17 18 19 20 21 22 23 243.3V 3.3V 2.9V 3.5V 3.2V 3.2V 0V 6.3V 3.5V 1.6V 1.6V 1.6V25 26 27 281.6V 1.6V 1.6V 1.6V IC5031 2 3 4 5 6 7 8 91011123.2V 0V 0V 0V 0V 0V 3.2V 0V 0V 0V 0V 0V13 14 15 16 17 18 19 20

33、 21 22 23 243.2V 3.2V 3.2V 3.2V 3.2V 3.2V 0V 0V 0V 0V 0V 0V25 26 2728 29 30 31 3233 34 35 363.2V 0V 0V 0V 0V 0V 0V 0V 0V 3.2V 0V 3.2V37 38 39 40 41 42 43 44 45 46 47 480V 3.2V 0V 0V 0V 0V 0V 3.2V 0V 0V 0V 0V49 500V 0V IC5041 2 3 4 5 6 7 8 91011124.4V 4.8V 4.8V 4.7V 4.7V 5.4V 0V 4.8V 4.8V 4.8V 2.3V 2

34、.5V13 14 15 16 17 18 19 20 21 22 23 240V 2.3V 2.4V 4.8V 4.8V 4.8V 0V 4.8V 4.8V 4.8V 0.3V 0.3V25 26 27 28 29 30 31 32 33 34 35 360V 0.4V 0V 0V 0V 0V 0V 4.9V 0.1V 4.8V 0V 4.9V37 38 39 40 41 42 43 44 45 46 47 480V 0V 0V 4.7V0V 0V 0.4V 4.9V 0V 4.9V 0V 0V49 50 51 52 53 54 55 56 57 58 59 604.7V 0V 0V 4.8V

35、0V 0V 4.9V 0V 0V 0V 0V 0V61 62 63 64 65 66 67 68 69 70 71 720V 4.8V 4.8V 0V 0V 0V 0V 0V 0V 0V 4.8V 0V73 74 75 76 77 78 79 800V 0.2V 0.7V0.1V 0V 0V 0V 4.8V IC601- 2-19 -E CB0V 0V 13.7V Q201E CB14V 14.3V 14.3V Q202E CB0V 13.9V0V Q203E CB12.5V 12.5V 11.6V Q308E CB0V 3.8V 11.7V Q309E CB1.4V 6.4V 6.4V Q8

36、02E CB12.5V 12.5V 11.6V Q307E CB0V 4.9V 0V Q310E CB0V 4.9V 4.9V Q311E CB0V 6.4V 4.3V Q803E CB6.5V 9.9V 7V Q804E CB0V 0V 0.6V Q807E CB5.2V 5.2V 4.6V Q808E CB10V 13V 10.6V Q810E CB11.6V 12.3V 12.3 Q811E CB0V 0V 0.6V Q813E CB8.8V 9.5V11.8V Q814E CB8.2V 8.9V 8.9V Q815E CB8.3V 9V 9V Q818E CB0V 0V 4.3V Q8

37、19E CB8.7V 9V8V Q820E CB0V 14.4V 14.4V Q204E CB14.4V 14.4V 13.6V Q205E CB0V 0V 3.8V Q206E CB0V 14V 0V Q207E CB0V 0V 0.6V Q208E CB0V 0V 0.6V Q209E CB0V 0V 0.6V Q210E CB0V 0V 0.6V Q211- 2-20 -E CB1.9V 2.85V 2.2V Q501E CB3.3V 3.3V 2.5V Q502E CB3.3V 0V 4.4V Q503E CB0V 4.8V 0V Q601E CB0V 0V 0.6V Q602E CB

38、0V 0.2V 4.7V Q603E CB3.9V 4.5V 4.5V Q604E CB0V 0V 4.5V Q605E CB5.5V 5.5V 0V Q606E CB0V 0V 0V Q504E CB0V 0V 0V Q505E CB0 0 0.6V Q607E CB0.2V 10V 5V Q801 BLOCK DIAGRAM2-212-222-232-24 SCHEMATIC DIAGRAMS1. MAIN SCHEMATIC DIAGRAM (POWER/EQ/AMP)2-252-262. FRONT/MICOM SCHEMATIC DIAGRAM2-272-283. DECK SCHE

39、MATIC DIAGRAM2-292-304. CDP SCHEMATIC DIAGRAM2-312-32 PRINTED CIRCUIT DIAGRAM1. MAIN P.C. DIAGRAM (SOLDER SIDE)2-332-341. MAIN P.C. DIAGRAM (COMPONENT SIDE)2-352-362. FRONT P.C. DIAGRAM (SOLDER SIDE)2-372-382. FRONT P.C. DIAGRAM (COMPONENT SIDE)2-392-403. BATTERY/POWER P.C. DIAGRAM 2-412-424. CD-MP3 P.C. DIAGRAM 2-432-44 WIRING DIAGRAM3-13-2SECTION 3. EXPLODED VIEWSA46282290291351355A41450268A26268268268267270A43280253252251250272254255256257A00258271263262266264260261261260265NOTE) Refer to “SECTION 4 REPLACEMENTPARTS LIST” in order to look for the part number of each part.MEMOMEMO