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LG LPC-LM340X, Service Manual

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LG LPC-LM340X Service Manual Download Page 12

- 2-9 -

• READING OK CHECK #D(=“NO DISC” DISPLAY)

DEFECTIVE IC501

DEFECTIVE IC503

DEFECTIVE PN503

CONNECTOR

DEFECTIVE PICUP
SPINDLE MOTOOR

CHECK PN503 CONNECTOR LINE

D

NO

NO

NO

NO

DOSE SP+ WAVEFORM

APPEAR AT(IC503 PIN 12 AND

PN503 PIN6)WAVEFORM #4

SPINDLE MOTOR DRIVE WAVE

DOSE SPIN WAVEFORM

APPEAR AT (IC503 PIN6)

WAVEFORM #4

SPINDLE DRIVE WAVE

YES

YES

Summary of Contents for LPC-LM340X

Page 1: ...L LPC LM340X SERVICE MANUAL P NO AFN32840831 JANUARY 2007 MP3 CD CASSETTE SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL LPC LM340X http biz lgservice com ...

Page 2: ... 1 2 SECTION 2 ELECTRICAL ADJUSTMENTS 2 1 TROUBLESHOOTING GUDIE 2 2 IC VOLTAGE SHEET 2 17 BLOCK DIAGRAM 2 21 SCHEMATIC DIAGRAM 2 23 PRINTED CIRCUIT DIARGAMS 2 31 WIRING DIAGRAM 2 43 SECTION 3 EXPLODED VIEWS 3 1 SECTION 4 REPLACEMENT PARTS LIST 4 1 ...

Page 3: ...e 65 74MHz 87 5 108MHz or 87 5 108MHz Intermediate Frequency 10 7MHz Antenna Telescopic antenna Tuning Range 522 1611kHz or 530 1610kHz Intermediate Frequency 450kHz Antenna Ferrite bar antenna Recording System 4 Tracks 2 channel stereo Frequency Response 125 8000Hz Signal to Noise Ratio 40 45dB REC PLAY General CD TAPE TUNER AM MW FM Designs and specifications are subject to change without notice...

Page 4: ... ADJUSTMENT ADJUST FOR DECK ADJUST PLAY BACK MTT 114 SPEAKER Output Azimuth adjusting screw STOP FWD LEFT L R Maximum RVS FWD RIGHT RVS LEFT 2 RECORD BIAS ADJUSTMENT DECK MODE TEST TAPE TEST POINT ADJUSTMENT DECK ADJUST FOR REC MODE MTT 5511 C241 L201 AUTO RVS 85kHz 5kHz AUTO STOP 60kHz 5kHz ...

Page 5: ... 2 2 TROUBLESHOOTING GUIDE 1 CD ...

Page 6: ...ECTIVE MAIN POWER SUPPLY CHECK THE SW502 DEFECTIVE IC503 DEFECTIVE MICOM MECHANISM CHECK LOING CHECK CN605 CN302 CHECK VOLTAGE CHANGE LO LO OF IC503 CHECK POWER SUPPLY CIRCUIT CN603 CN302 PN508 PIN8 6 2V PIN7 5V PN507 PIN1 5V YES YES YES NO NO NO NO ...

Page 7: ... 2 4 READING DISPLAY CHECK ONLY CD DISPLAY ...

Page 8: ...K CHECK PN501 PIN 14 15 TA TA CHECK PN503 PIN5 6 SP SP CHECK PN501 PIN 10 LD CHECK PN501 PIN 15 16 FA FA CHECK PN503 PIN3 4 SL SL DEFECTIVE PICKUP OR IC503 OR IC501 OR IC502 DEFECTIVE PICKUP OR IC503 OR IC501 DEFECTIVE PICKUP OR IC502 DEFECTIVE PICKUP OR IC503 DEFECTIVE PICKUP OR IC503 OR IC501 OR IC502 A B C D E NO NO NO NO NO NO NO NO NO NO YES YES YES YES YES ...

Page 9: ...EAR AT IC503 PIN 14 AND PN503 PIN3 WAVEFORM 2 SLED MOTOR WAVE DOSE SLIN WAVEFORM APPEAR AT IC503 PIN5 WAVEFORM 2 SLED DRIVE WAVE CHECK PN503 CONNECTOR LINE DEFECTIVE IC501 DEFECTIVE IC503 DEFECTIVE PN503 CONNECTOR DEFECTIVE PICUP SLED MOTOR A YES NO NO NO NO NO ...

Page 10: ...503 PIN 1 5 AND PN50 1 PIN 16 WAVEFORM 3 FOCUS COIL DRIVE WAVE DOSE FAIN WAVEFORM APPEAR AT IC503 PIN26 WAVEFORM 3 FOCUS DRIVE WAVE CHECK PN50 1 CONNECTOR LINE DEFECTIVE IC50 1 DEFECTIVE IC503 DEFECTIVE PN501 CONNECTOR DEFECTIVE PICUP FOCUS ACTUATOR B YES NO NO NO NO NO ...

Page 11: ...Y VOLTAGE CHECK IS 3 3V APPLIED TO PIN3 OF IC502 RF IC SUPPLY VOLTAGE CHECK CHECK PN501 CONNECTOR LINE DEFECTIVE IC501 IS 2 0V PIC2 OF IC502 LASER CONTROL VOLTAGE CHECK DEFECTIVE IC501 DEFECTIVE IC503 DEFECTIVE PICUP FOCUS ACTUATOR DEFECTIVE PN501 CONNECTOR C YES YES NO NO NO NO NO NO ...

Page 12: ...503 DEFECTIVE PN503 CONNECTOR DEFECTIVE PICUP SPINDLE MOTOOR CHECK PN503 CONNECTOR LINE D NO NO NO NO DOSE SP WAVEFORM APPEAR AT IC503 PIN 12 AND PN503 PIN6 WAVEFORM 4 SPINDLE MOTOR DRIVE WAVE DOSE SPIN WAVEFORM APPEAR AT IC503 PIN6 WAVEFORM 4 SPINDLE DRIVE WAVE YES YES ...

Page 13: ...PPEAR AT IC503 PIN23 WAVEFORM 5 TRACKING DRIVE WAVE CHECK PN503 CONNECTOR LINE DEFECTIVE IC501 DEFECTIVE IC503 DEFECTIVE PN503 CONNECTOR DEFECTIVE PICKUP OR IC502 DEFECTIVE PN503 CONNECTOR DEFECTIVE PICUP SPINDLE MOTOOR DOSE ARF SIGNAL APPEAR IC502 PORT8 WAVEFORM 6 DOSE FE TE SIGNAL APPEAR IC502 PORT FE 23 RE 21 WAVEFORM 6 NO NO NO NO NO NO NO YES YES YES ...

Page 14: ...ace the IC801 Check the D602 D604 D605 Check the ZD803 Q807 Check the Q601 Replace the X601 X602 Check the Q810 E DC Power output Check the D901 D902 D903 D904 Check the DC power output of IC801 pin3 5 2V Check the power output IC601 pin17 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 Replace the IC601 NO NO NO NO NO NO NO NO NO Y...

Page 15: ...e signal input of IC301 pin2 5 Check the signal input of IC301 pin1 6 Check the signal input of IC301 pin3 4 Refer to Tuner Pack Trouble Shooting Check the signal input of PN302 R CH L CH Refer to TAPE Trouble Shooting Check the HIGH of the IC601 pin9 Check the pattern Replace the Q305 Q306 Check the IC601 NO NO NO YES YES YES YES YES YES YES YES ...

Page 16: ...tor Check the Pattern Replace the IC301 Check the IC601 END Check the Power supplying to IC301 pin24 Check the 8 2V DC output ZD302 Check the Data of IC601 pin 6 7 CD TAPE Function Check the CLK Data of IC301 pin 21 22 NO NO NO NO YES YES YES YES ...

Page 17: ... DC output of HIGH Q818 C Check the high Q819 B Check the DC output Q802 E pattern Replace Tuner pack CE Chip Emable DI Data Input From u com DO Data Output to u com CLK Tuner Mode Clock Check the PN301 of CE DI DO CLK PLL Is the normal END YES YES YES YES NO NO NO ...

Page 18: ... IC201 pin18 Check the signal output of IC201 pin5 20 Check the LOW of Q210 211 B Check the DC output Q815 C Check the high IC601 pin92 Replace the Deck Mecha Check the pattern Check the Deck Mecha Replace the IC201 YES YES YES YES NO NO NO NO Play ...

Page 19: ...on of L201 pin1 3 Replace the deck Check the power supplying to C245 Check the LOW Q813 C Check the IC601 pin87 Check the DC output of Q811 C Check the Oscillation of Q202 E Check the signal of R239 R240 Check the pattern Check the 0 6V of Q203 B Replace the L201 Replace Q208 209 YES YES YES YES YES YES YES NO NO NO NO NO NO NO ...

Page 20: ... 13 14 15 16 17 18 19 20 21 22 23 24 0V 3 3V 3 3V 0V 0V 0V 0V 0V 0V 0V 0V 0V 25 26 27 28 29 30 31 32 33 34 35 36 0V 0V 0V 1 5V 1 5V 0V 0V 0V 0V 0V 1 6V 0V 37 38 39 40 41 42 43 44 45 46 47 48 1 7V 0V 3 3V 1 6V 1 6V 1 6V 1 6V 1 6V 1 6V 3 2V 0V 0V 49 50 51 52 53 54 55 56 57 58 59 60 0V 3 2V 0 8V 1 6V 1 6V 3 2V 1 4V 1 4V 0V 1 6V 0V 1 6V 61 62 63 64 65 66 67 68 69 70 71 72 3 2V 0V 0V 0V 0V 0V 1 5V 0V 0...

Page 21: ...2V 3 2V 3 2V 3 2V 0V 0V 0V 0V 0V 0V 25 26 27 28 29 30 31 32 33 34 35 36 3 2V 0V 0V 0V 0V 0V 0V 0V 0V 3 2V 0V 3 2V 37 38 39 40 41 42 43 44 45 46 47 48 0V 3 2V 0V 0V 0V 0V 0V 3 2V 0V 0V 0V 0V 49 50 0V 0V IC504 1 2 3 4 5 6 7 8 9 10 11 12 4 4V 4 8V 4 8V 4 7V 4 7V 5 4V 0V 4 8V 4 8V 4 8V 2 3V 2 5V 13 14 15 16 17 18 19 20 21 22 23 24 0V 2 3V 2 4V 4 8V 4 8V 4 8V 0V 4 8V 4 8V 4 8V 0 3V 0 3V 25 26 27 28 29 ...

Page 22: ...803 E C B 6 5V 9 9V 7V Q804 E C B 0V 0V 0 6V Q807 E C B 5 2V 5 2V 4 6V Q808 E C B 10V 13V 10 6V Q810 E C B 11 6V 12 3V 12 3 Q811 E C B 0V 0V 0 6V Q813 E C B 8 8V 9 5V 11 8V Q814 E C B 8 2V 8 9V 8 9V Q815 E C B 8 3V 9V 9V Q818 E C B 0V 0V 4 3V Q819 E C B 8 7V 9V 8V Q820 E C B 0V 14 4V 14 4V Q204 E C B 14 4V 14 4V 13 6V Q205 E C B 0V 0V 3 8V Q206 E C B 0V 14V 0V Q207 E C B 0V 0V 0 6V Q208 E C B 0V 0...

Page 23: ...V Q502 E C B 3 3V 0V 4 4V Q503 E C B 0V 4 8V 0V Q601 E C B 0V 0V 0 6V Q602 E C B 0V 0 2V 4 7V Q603 E C B 3 9V 4 5V 4 5V Q604 E C B 0V 0V 4 5V Q605 E C B 5 5V 5 5V 0V Q606 E C B 0V 0V 0V Q504 E C B 0V 0V 0V Q505 E C B 0 0 0 6V Q607 E C B 0 2V 10V 5V Q801 ...

Page 24: ... BLOCK DIAGRAM 2 21 2 22 ...

Page 25: ...2 23 2 24 SCHEMATIC DIAGRAMS 1 MAIN SCHEMATIC DIAGRAM POWER EQ AMP ...

Page 26: ...2 25 2 26 2 FRONT MICOM SCHEMATIC DIAGRAM ...

Page 27: ...2 27 2 28 3 DECK SCHEMATIC DIAGRAM ...

Page 28: ...2 29 2 30 4 CDP SCHEMATIC DIAGRAM ...

Page 29: ...2 31 2 32 PRINTED CIRCUIT DIAGRAM 1 MAIN P C DIAGRAM SOLDER SIDE ...

Page 30: ...2 33 2 34 1 MAIN P C DIAGRAM COMPONENT SIDE ...

Page 31: ...2 35 2 36 2 FRONT P C DIAGRAM SOLDER SIDE ...

Page 32: ...2 37 2 38 2 FRONT P C DIAGRAM COMPONENT SIDE ...

Page 33: ...2 39 2 40 3 BATTERY POWER P C DIAGRAM ...

Page 34: ...2 41 2 42 4 CD MP3 P C DIAGRAM ...

Page 35: ...2 43 2 44 WIRING DIAGRAM ...

Page 36: ...55 A41 450 268 A26 268 268 268 267 270 A43 280 253 252 251 250 271 254 255 256 257 A00 258 270 263 399 262 266 264 260 261 261 A48 265 FRONT CD POWER 305 MAIN NOTE Refer to SECTION 4 REPLACEMENT PARTS LIST in order to look for the part number of each part ...

Page 37: ...MEMO MEMO ...

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