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LG LPC-LM340X Service Manual

Mp3/cd cassette
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MP3/CD CASSETTE
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL.
P/NO : AFN32840831
JANUARY, 2007
MODEL: LPC-LM340X

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  • Page 1 MP3/CD CASSETTE SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN32840831 JANUARY, 2007 MODEL: LPC-LM340X...

  • Page 2: Table Of Contents

    [CONTENTS] ❍ SECTION 1. GENERAL • SPECIFICATIONS ............1-2 ❍...

  • Page 3: Specifications

    SECTION 1. GENERAL ❏ SPECIFICATIONS Remote Control Operation Range Point 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. MODEL LPC-LM340A/X, LPC-BM340A/X SECTION...

  • Page 4: Adjustments

    SECTION 2. ELECTRICAL ❏ ADJUSTMENTS 1. TAPE DECK ADJUSTMENT DECK MODE TEST TAPE TEST POINT ADJUSTMENT ADJUST FOR DECK ADJUST STOP FWD: LEFT PLAY BACK MTT-114 SPEAKER Output Azimuth adjusting screw L/R Maximum RVS FWD: RIGHT RVS: LEFT 2. RECORD BIAS ADJUSTMENT DECK MODE TEST TAPE TEST POINT ADJUSTMENT...
  • Page 5 ❏ TROUBLESHOOTING GUIDE 1. CD - 2-2 -...
  • Page 6 • OPEN COLOSE NG CONNECTOR LOCKING CHECK CHECK THE(SW502) CHECK LOING CHECK (CN605, CN302) CHECK POWER SUPPLY CIRCUIT (CN603, CN302) DEFECTIVE MAIN PN508 PIN8 = 6.2V, PIN7 = 5V, PN507 PIN1=5V POWER SUPPLY DEFECTIVE IC503 CHECK VOLTAGE CHANGE LO+, LO- OF IC503 DEFECTIVE MICOM MECHANISM - 2-3 -...
  • Page 7 • “READING” DISPLAY CHECK (=ONLY “CD” DISPLAY) - 2-4 -...
  • Page 8 • READING OK CHECK (= “ NO DISC ” DISPLAY) CONNECTOR LOCKING CHECK(PN501 ,PN503) DOES SLED MOVE? DEFECTIVE PICKUP OR CHECK PN503 PIN3, 4 IC503 OR IC501 OR IC502 (SL+,SL-) DOSE LENSE MOVE? (UP&DOWN) DEFECTIVE PICKUP OR CHECK PN501 PIN 15, 16 IC503 OR IC501 (FA-,FA+) DOSE LASER LIGHT?
  • Page 9 • READING OK CHECK #A(=“NO DISC” DISPLAY) DOSE SL+ WAVEFORM APPEAR AT(IC503 PIN 14 AND PN503 PIN3)WAVEFORM #2 SLED MOTOR WAVE DOSE SLIN WAVEFORM APPEAR AT (IC503 PIN5) DEFECTIVE IC501 WAVEFORM #2 SLED DRIVE WAVE DEFECTIVE IC503 DEFECTIVE PN503 CHECK PN503 CONNECTOR LINE CONNECTOR DEFECTIVE PICUP SLED MOTOR...
  • Page 10 • READING OK CHECK #B(=“NO DISC” DISPLAY) DOSE FA+ WAVEFORM APPEAR AT(IC503 PIN 1 5 AND PN50 1 PIN 16)WAVEFORM #3 FOCUS COIL DRIVE WAVE DOSE FAIN WAVEFORM APPEAR AT (IC503 PIN26) DEFECTIVE IC50 1 WAVEFORM #3 FOCUS DRIVE WAVE DEFECTIVE IC503 DEFECTIVE PN501 CHECK PN50 1 CONNECTOR LINE...
  • Page 11 • READING OK CHECK #C(=“NO DISC” DISPLAY) IC ?V APPLIED TO PIN 10 OF PN501 LASER SUPPLY VOLTAGE CHECK IS 3.3V APPLIED TO PIN3 OF IC502 DEFECTIVE IC501 RF IC SUPPLY VOLTAGE CHECK IS 2.0V PIC2 OF IC502 LASER CONTROL DEFECTIVE IC501 VOLTAGE CHECK DEFECTIVE IC503...
  • Page 12 • READING OK CHECK #D(=“NO DISC” DISPLAY) DOSE SP+ WAVEFORM APPEAR AT(IC503 PIN 12 AND PN503 PIN6)WAVEFORM #4 SPINDLE MOTOR DRIVE WAVE DOSE SPIN WAVEFORM APPEAR AT (IC503 PIN6) DEFECTIVE IC501 WAVEFORM #4 SPINDLE DRIVE WAVE DEFECTIVE IC503 DEFECTIVE PN503 CHECK PN503 CONNECTOR LINE CONNECTOR DEFECTIVE PICUP...
  • Page 13 • READING OK CHECK #E(=“NO DISC” DISPLAY) DOSE TA+ WAVEFORM APPEAR AT(IC503 PIN17 AND PN503 PIN 15)WAVEFORM #5 TRACKING COIL DRIVE WAVE DOSE TAIN WAVEFORM APPEAR AT (IC503 PIN23) DEFECTIVE IC501 WAVEFORM #5 TRACKING DRIVE WAVE DEFECTIVE IC503 DEFECTIVE PN503 CHECK PN503 CONNECTOR LINE CONNECTOR DOSE ARF SIGNAL APPEAR?
  • Page 14 2. MAIN POWER Main 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 Fuse Replace the Fuse Check the D901,D902,D903,D904 Check the DC power output of IC801 Replace the ZD805 Check the ZD805 of +13V pin3 +5.2V...
  • Page 15 3. MUTING CIRCUIT(MUTE) Dose “ HIGH ” appear at Check the “HIGH” of the Check the IC601 Q305, Q306 “ B ” IC601 pin9 Check the pattern Check the “LOW ” of Q305, Q306 “E ” Replace the Q305, Q306 MUTE 4.
  • Page 16 5. IC301 Check the Power supplying to Check the +8.2V DC output ZD302 IC301 pin24 Check the CLK Data of Check the Data of Check the IC601 IC301 pin 21,22 IC601 pin 6, 7 (CD © TAPE Function) Check the Pattern Check the IC601 Function Selector Replace the IC301 - 2-13 -...

  • Page 17: Tuner Pack

    6. TUNER PACK Check the Tuner Power of Check the DC output of Check the “high” PN101 “Tu- B+” “HIGH” Q818 “C” Q819 “B ” Check the DC output Q802 “E”, pattern Check the PN301 of CE, DI, DO, CLK (PLL) CE : Chip Emable DI : Data Input(From u-com) DO : Data Output(to u-com)
  • Page 18 7. TAPE DECK [Play] Check the power supplying to Check the DC output Check the “high” Q815 “C” IC601 pin92 IC201 pin18 Check the pattern Replace Check the signal output of Check the Deck Mecha the Deck Mecha IC201 pin5,20 Replace the IC201 Check the “LOW”...
  • Page 19 [REC] Check the “LOW ” of Check signal supplied to Check the “LOW ” of Q208, 209 ”B” IC201 pin 11, 14 IC601 pin32 Replace Q208, 209 Check the Oscillation of L201 pin1, 3 Replace the deck Check the power supplying to C245(+) Check the “LOW ”...
  • Page 20 ❏ VOLTAGE SHEET • IC201 1.3V 1.3V 1.4V 1.7V 4.5V 1.3V 0.8V 1.3V 1.4V 7.8V 7.5V 1.3V 1.3V • IC202 7.8V • IC301 3.9V 4.1V 4.1V 4.1V 4.1V 3.9V 4.1V 4.1V 4.1V 4.1V 4.1V 4.1V 4.1V 4.1V 4.1V 4.1V 4.1V 4.1V 8.2V 3.4V...
  • Page 21 • IC502 2.1V 3.2V 2.3V 1.6V 1.5V 1.5V 1.5V 3.2V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V • IC503 1.2V 3.5V 1.6V 1.5V 6.3V 6.3V 3.6V 3.3V 3.3V 2.9V 3.5V 3.2V 3.2V 6.3V 3.5V 1.6V 1.6V...
  • Page 22 • Q201 • Q202 • Q203 14.3V 14.3V 13.9V 0V 13.7V • Q204 • Q205 • Q206 14.4V 14.4V 13.6V 3.8V 14.4V 14.4V • Q207 • Q208 • Q209 0.6V 0.6V • Q210 • Q211 0.6V 0.6V • Q308 • Q309 •...
  • Page 23 • Q501 • Q502 • Q503 3.3V 3.3V 2.5V 3.3V 4.4V 1.9V 2.85V 2.2V • Q504 • Q505 • Q601 • Q602 • Q603 0.6V 0.2V 4.7V 4.8V • Q604 • Q605 • Q606 4.5V 5.5V 5.5V 3.9V 4.5V 4.5V •...

  • Page 24: Block Diagram

    ❏ BLOCK DIAGRAM 2-21 2-22...

  • Page 25: Schematic Diagram

    ❏ SCHEMATIC DIAGRAMS 1. MAIN SCHEMATIC DIAGRAM (POWER/EQ/AMP) 2-23 2-24...
  • Page 26 2. FRONT/MICOM SCHEMATIC DIAGRAM 2-25 2-26...
  • Page 27 3. DECK SCHEMATIC DIAGRAM 2-27 2-28...
  • Page 28 4. CDP SCHEMATIC DIAGRAM 2-29 2-30...
  • Page 29 ❏ PRINTED CIRCUIT DIAGRAM 1. MAIN P.C. DIAGRAM (SOLDER SIDE) 2-31 2-32...
  • Page 30 1. MAIN P.C. DIAGRAM (COMPONENT SIDE) 2-33 2-34...
  • Page 31 2. FRONT P.C. DIAGRAM (SOLDER SIDE) 2-35 2-36...
  • Page 32 2. FRONT P.C. DIAGRAM (COMPONENT SIDE) 2-37 2-38...
  • Page 33 3. BATTERY/POWER P.C. DIAGRAM 2-39 2-40...
  • Page 34 4. CD-MP3 P.C. DIAGRAM 2-41 2-42...

  • Page 35: Wiring Diagram

    ❏ WIRING DIAGRAM 2-43 2-44...

  • Page 36: Section 3. Exploded Views

    SECTION 3. EXPLODED VIEWS NOTE) Refer to “SECTION 4 REPLACEMENT PARTS LIST” in order to look for the part number of each part. MAIN FRONT...
  • Page 37 MEMO MEMO...

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