LG LM-U360 Service Manual
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LG LM-U360 Service Manual

3cd changer mini hi-fi system
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3CD CHANGER
MINI Hi-Fi SYSTEM
SERVICE MANUAL
MODEL : LM-U360/LMS-U360,
LM-U365/LMS-U365
P/NO : AFN31223617
JULY,2006

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Summary of Contents for LG LM-U360

  • Page 1 3CD CHANGER MINI Hi-Fi SYSTEM SERVICE MANUAL MODEL : LM-U360/LMS-U360, LM-U365/LMS-U365 P/NO : AFN31223617 JULY,2006...

  • Page 2: Table Of Contents

    [CONTENTS] SECTION 1. GENERAL • SERVICING PRECAUTIONS ..........1-2 •...

  • Page 3: Section 1. General

    SECTION 1. 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. Storage in conductive bag Drop impact 2.
  • Page 4 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 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.

  • Page 5: Esd Precautions

    ❏ 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 Devices (ESD). Examples of typical ESD devices are integrat- ed 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.
  • Page 6 Signal to Noise Ratio 30 dB Frequency Response 140 - 1800 Hz [AMP]MPLIFIER(LH-W96’s) Output Power 100W +100W+150W [LM-U1560+LMS-U1560W(SUB WOOFER)] 100W+100W [LM-U1060] 50W +50W [LM-U560] 30W + 30W [LM-U360] T.H.D 0.5% Frequency Response 40 - 20000 Hz Signal-to-noise ratio 75 dB [TAPE] Tape Speed 4.75cm/sec...
  • Page 7 - 1-6 -...

  • Page 8: Section 2. Electrical

    SECTION 2. ELECTRICAL ❏ ELECTRICAL TROUBLESHOOTING GUIDE(AUDIO PART) I MICOM PART CHECK I Refer to SMPS P7904 6PIN P-SENS check Troubleshooting IC101 KIA7042? Check if IC101 KIA7042 input is over 5V IC101 KIA7042 relevant parts check Check if IC101 KIA7042 IC100 78KO/KF2 1 PIN input is over 4.3V Power Check...
  • Page 9 I MICOM PART CHECK II P7904 5PIN 5.6V check Refer to SMPS Troubleshooting D101 1SR35 both terminal power check Output 5V operation check D101 1SR35 relevant parts relevant parts check replacement Q101 EMITTER 5V check and COLLECTO normal Q102 BASE PIN 0.6V HIGH check Check if IC101 KIA7042 output...
  • Page 10 I IC103 KS4CD21CS CHECK IC100 78KOKF2 22,24 PIN Check Refer to MICOM 22 PIN DATA MICOM power 5V check Troubleshooting relevant parts check relevant parts replacement normal normal I FLD DISPLAY CHECK P7904 1,2,3 power check Refer to SMPS Troubleshooting F1+, F2 both terminal: 5V and above VKK: power is over 26V P7302 connection status...
  • Page 11 If 5V defective D321 SR35 input and output power check IC100 © IC301 DATA Communication check relevant parts check (ST8)75 PIN © 3PIN(STB) relevant parts (DO) 76 PIN © 2PIN(DO) replacement (DI) 77 PIN © 4PIN(DI) (CLK)78 PIN © 1PIN(CLK) normal IC100 (STB)75 PIN ©...
  • Page 12 I PWM ALTERATION PART CHECK Refer to SMPS P7905 9PIN 3.3V check Troubleshooting IC604 PS9829 VDD PIN Power check (3.10.22.29.39.47.56.65.72. 87. 94) X601 12.288MHz operation check relevant parts check X604 12.288MHz relevant parts IC604 PS9829 replacement 86 PIN CLK input check normal R668(470Ω) output check relevant parts...
  • Page 13 I POWER AMP PART CHECK P7905 3 PIN+12 13.14.15 PIN [ LM-U1560 : 32V/LM-U1060 : 32V/LM-U560 : 22V/LM-U360 : 16V ] Refer to SMPS Troubleshooting Each IC700,701 34, 29, 26, 21 PIN input power check Each IC700, 701 1, 36.17,...
  • Page 14 I AUX FUNCTION Check whether JK800 contacts or not IC200 (BU4052)4,11PI N input waveform check IC200 (BU4052)16PINVDD, 8PIN VSS power check IC200 (BU4052)3,13PIN output µ-COM (IC100) 3, 6PIN waveform check Communication check relevant parts replacement IC801 (MC4580) 3, 5 PIN input waveform check IC801 (MC4580)4PIN VSS,8PIN VDD power check...
  • Page 15 I TUNER FUNCTION CHECK Tuner module (TUN800) operation check TUNER MODUEL power check (2PIN 9Vcheck) IC200(BU4052)1, 12PIN input waveform check IC200 (BU4052)3,13PIN output waveform check IC601(BU4052)2,15PIN input waveform check IC200 (BU4052)16PIN- relevant parts replacement VDD,8PIN VSS power check IC801 (MC4580)2,6PIN input waveform check.
  • Page 16 I TAPE PLAY PART CHECK P2707:4 PIN © 12V Refer to SMPS Troubleshooting IC201 (HA12237)16 PIN 12V input waveform check IC201:5.26 PIN Signal Output check DECK HEAD input check HEAD WIRE or Mecha replacement DECK HEAD input IC201 32.39 PIN check relevant parts check IC20114 PIN MUTE operation check...
  • Page 17 I TAPE REC PART CHECK IC604 PS9829 #49,#52 PWM Refer to PWM modulation output check part Q601 Collector waveform check P7207 #2.#4 output check Board to Board cantact check P2707 #5.#7 input check IC203 MC4580 #1,#7 check IC203 8 PIN +12V check Refer to SMPS IC201 7.24 PIN REC input Troubleshooting...
  • Page 18 I SMPS POWER CIRCUIT *MAIN PART Check the fuse F901 Replace the fuse Check the DC V of C905. Check BD901, LF901,902 If DC V is over 400V Chcek the DC V Of C909, Check IC901 ,902 Replace IC 901,902 C903,C921 If DC V is in 14~19V and it is steady.
  • Page 19 *P-SENS PART (OPTIONAL PART) Check the PIN6 OF P9702 Check power circuit Trouble If DC V is over 5.6V shooting *VKK PART Check the PIN3 OF P9702 Check power circuit If DC V is over -28V ±2 Trouble shooting - 2-12 -...

  • Page 20: Internal Block Diagram Of Ics

    ❏ INTERNAL BLOCK DIAGRAM of ICs • UTC MC4580 PIN CONFIGURATION TEST CIRCUIT - 2-13 -...
  • Page 21 • FAN8082D Internal Block Diagram - 2-14 -...
  • Page 22 • BU2090 Block diagram - 2-15 -...
  • Page 23 • BA3308 / BA3308F BLOCK DIAGRAM BA3308 BA3308F - 2-16 -...
  • Page 24 • HT1200-4 SYSTEM BLOCK DIAGRAM - 2-17 -...
  • Page 25 • HT1200-4 FUNCTIONAL BLOCK DIAGRAM - 2-18 -...
  • Page 26 • CS5340 BLOCK DIAGRAM • BU4052 BLOCK DIAGRAM - 2-19 -...
  • Page 27 • HA12237F BLOCK DIAGRAM - 2-20 -...
  • Page 28 • PT6324 BLOCK DIAGRAM - 2-21 -...

  • Page 29: Electrical Troubleshootihg Guide & Waveform(Cd Part)

    ❏ ELECTRICAL TROUBLESHOOTIHG GUIDE & WAVEFORM(CD PART) I POWER CHECK GUIDE POWER ON POWER ON PUSH KARAOKE CD BUTTON DOES CD DOES AUX,FM 87.5 APPEAR AT FLD? APPEAR AT FLD? DOES IT DOES DISK1 APPEAR CD APPEAR AT FLD? ERROR AT FLD? CHECK DOES NO DISC OR CONNECTOR (P4703,P4004,...
  • Page 30 I CD PART TURN ON CD CONNECTOR CHECK OPEN CLOSE CHECK ( PN803, PN804 ) CHECK Voltage CN806 PIN1:12, PIN2:6.3V CHECH Vtg PN805 PIN22 : CLOSE,PIN23:OPEN “ READING ” CONNECTOR CHECK (PN802, DISPLAY CHECK PN803, PN804, CN806,PN814 ) CHECK MICOM INTERFACE CIRCUIT( PN805 ) (CE,BTL-MUTE,CD-IN,CDOUT,CLK,WRQ,FSEQ) CONNECTOR READING OK CHECK...
  • Page 31 I OPEN CLOSE NG CONNECTOR LOCKING CHECK ( PN803, PN804, PN814 ) CHECK POWER SUPPLY CIRCUIT ( PN805, CN806) DEFECTIVE MAIN POEWR SUPPLY CN806 PIN1:12V, PIN2:6.3V, PN805 PIN8:+5V_AD CHECK VOLTAGE CHANGE OF OPEN CLOSE IC803 INPUT VOLTAGE DEFECTIVE MICOM PIN6:12V, PIN7:6.3V (PN805 PIN2:BTL_MUTE, 23:OPEN, 22:CLOSE) CHECK VOLTAGE CHANGE LO+, LO- OF DEFECTIVE IC803 IC803 (PN805 PIN23:OPEN, PIN22:CLOSE)
  • Page 32 I “ READING ” DISPLAY CHECK (= ONLY “CD” DISPLAY) CONNECTOR LOCKING CHECK (PN802, PN803,PN804,PN805,CN806 ) CHECK POWER SUPPLY PORT( PN805, DEFECTIVE CONNECTOR OR CN806) CN806 PIN1: 12V, PIN2: 6.3V, MAIN POWER SUPPLAY PIN4: 5V PN805 PIN8 = 5V_AD CHECK VOLTAGE THE PIN 2 OF IC804 DEFECTIVE IC804 IC804 PIN2 : 3.3V CHECK RESET SIGNAL OF PN805...
  • Page 33 I READING OK CHECK (= “NO DISC” DISPLAY) CONNECTOR LOCKING CHECK(PN801,PN802) CHECK PN802 DEFECTIVE PICKUP OR DOES SLED MOVE ? PIN 3,4( SL+,SL-) IC802 OR IC801 DOES LENSE MOVE ? CHECK PN801 DEFECTIVE PICKUP OR (= UP & DOWN) PIN 13,16 ( FA+,FA-) IC802 OR IC801 DEFECTIVE PICKUP OR DOES LASER LIGHT ?
  • Page 34 I READING OK CHECK #A (= “NO DISC” DISPLAY) DOES SL+ WAVEFORM DOES SLIN WAVEFORM DEFECTIVE IC801 APPEAR AT ( IC802 PIN13 APPEAR AT ( IC802 PIN5) AND PN 802 PIN3) WAVE- WAVEFORM #2 SLED FORM #2 SLED MOTOR DRIVE WAVE WAVE DEFECTIVE IC802 CHECK PN802...
  • Page 35 I READING OK CHECK #B (= “NO DISC” DISPLAY) DOES FA+ WAVEFORM DOES FAINWAVEFORM DEFECTIVE IC801 APPEAR AT ( IC802 PIN16 APPEAR AT ( IC802 PIN 25) AND PN801 PIN13) WAVE- WAVEFORM #3 FOCUS FORM #3 FOCUS COIL DRIVE WAVE DRIVE WAVE DEFECTIVE IC802 CHECK PN801...
  • Page 36 I READING OK CHECK #C (= “NO DISC” DISPLAY) IS 3.3 V APPLIED TO PIN30, IS ?V APPLIED TO PIN10 OF DEFECTIVE IC804 36, 39, 41, 61, 68, 75 OF PN801 IC801 LASER SUPPLY VOLTAGE RF IC SUPPLY VOLTAGE CHECK CHECK IS 2.3 V PIN18(LDO) OF DEFECTIVE IC801...
  • Page 37 I READING OK CHECK #D (= “NO DISC” DISPLAY) DOES SP+ WAVEFORM DOES SPIN WAVEFORM DEFECTIVE IC801 APPEAR AT ( IC802 PIN11 APPEAR AT (IC802 PIN6) AND PN802 PIN 5) WAVE- WAVEFORM #4 FORM #4 SPINDLE MOTOR SPINDLE DRIVE WAVE DRIVE WAVE DEFECTIVE IC802 CHECK PN802...
  • Page 38 I READING OK CHECK #E (= “NO DISC” DISPLAY) DOES TA+ WAVEFORM DOES TAINWAVEFORM DEFECTIVE IC801 APPEAR AT ( IC802 PIN17 APPEAR AT ( IC802 PIN 22) AND PN801 PIN14) WAVEFORM #5 TRACKING WAVEFORM #5 TRACKING DRIVE WAVE COIL DRIVE WAVE DEFECTIVE IC802 CHECK PN802 DEFECTIVE PN802...
  • Page 39 I USB PART TURN ON USB CONNECTOR CHECK “ CHECKING ” OR “USB” DISPLAY CHECK ( PN805, CN806, PN810 ) CHECK POWER SUPPLY CIRCUIT( CN806 ) CHECK MICOM INTERFACE CIRCUIT( PN805 ) PIN13: RX (IC805 PIN49 :TXD) PIN14: TX (IC805 PIN33 : RXD) READING OK CHECK CHECK PN810 1 PIN : 5V CHECK PN810 PIN 2(D-), 3(D+)
  • Page 40 I WAVEFORMS OF MAKOR CHECK POINT #1. MICOM INTERFACE WAVEFORM #2. MICOM INTERFACE WAVEFORM (PN805 PIN 26, 19, 3, 15) DURING POWER ON (PN805 PIN 26, 19, 3, 15) DURING NORMAL PLAY PIN 26 : WRQ PIN 26 : WRQ PIN 19 : RESET PIN 19 : RESET PIN 3 : DI (IC801 PIN46 DATA OUT)
  • Page 41 I WAVEFORMS OF MAKOR CHECK POINT #2. SLED DRIVE AND MOTOR WAVEFORM #2. MICOM INTERFACE WAVEFORM (IC802 PIN 5, 13) WHEN FOCUS SEARCH (PN805 PIN 26, 19, 3, 15) DURING NORMAL PLAY PIN 26 : WRQ PIN 5 : SLIN PIN 5 : SLIN PIN 13 : SL+ PIN 13 : SL+...
  • Page 42 I WAVEFORMS OF MAKOR CHECK POINT #4. SPINDLE DRIVE AND MOTOR WAVEFORM #5. TRACK DRIVE AND MOTOR WAVEFORM (IC802 PIN 6, 11) WHEN TOC READING (IC802 PIN 22 , IC802 PIN 17) DURING NORMAL PLAY PIN 22 : TAO PIN 6 : SPIN PIN 17 : TA+ PIN 11 : SP+ #6.

  • Page 44: Wiring Diagram

    ❏ WIRING DIAGRAM FRONT MAIN DECK SMPS EAD30732401 561-7150 561-711C 561-844G 6631R-F039K EAD30731701 6630XE00130 561-711E 561-715C 6631R-E108H 561-7073 561-711H 6630XE00130 6630XF00415 6630XF00429 561-715D 561-715H 561-843G 561-711F 6630XE00816 3 CHANGER MECHANISM 6850R-H020A 561-715H DECK MECHANISM 3PIN 8PIN 8PIN 563-935H 8PIN 8PIN 29PIN 29PIN 6850R-H322A...

  • Page 45: Block Diagram

    ❏ BLOCK DIAGRAM LM-U1560 : 2.1CH (100W X 2Ch + 150W) LM-U1060 : 2CH (100W X 2Ch ) LM-U560 : 2CH (50W X 2Ch) LM-U360 : 2CH (30W X 2Ch) FLD (DISPLAY) VFD DRIVE IC PT6324 VFD DATA.CLK MAIN BOARD AMP BOARD 9.8304 MHz...

  • Page 46: Schematic Diagrams

    ❏ SCHEMATIC DIAGRAMS • MAIN SCHEMATIC DIAGRAM 2-40 2-41...
  • Page 47 • AMP SCHEMATIC DIAGRAM 2-42 2-43...
  • Page 48 • FRONT SCHEMATIC DIAGRAM 2-44 2-45...
  • Page 49 • DECK SCHEMATIC DIAGRAM 2-46 2-47...
  • Page 50 • CD SCHEMATIC DIAGRAM 2-48 2-49...
  • Page 51 • USB SCHEMATIC DIAGRAM 2-50 2-51...
  • Page 52 2. Voltages are DC-measured with a digital voltmeter MODIFIED OR ALTERED WITHOUT PERMISSION IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. FROM THE LG ELECTRONICS CORPORATION. ALL PERFORMANCE IMPROVEMENT CHANGES INTO • SMPS SCHEMATIC DIAGRAM COMPONENTS SHOULD BE REPLACED ONLY WITH...

  • Page 53: Printed Circuit Diagrams

    ❏ PRINTED CIRCUIT DIAGRAMS • MAIN P.C. BOARD (TOP VIEW) 2-54 2-55...
  • Page 54 • MAIN P.C. BOARD (BOTTOM VIEW) 2-56 2-57...
  • Page 55 • FRONT P.C. BOARD 2-58 2-59...
  • Page 56 • SMPS P.C. BOARD • DECK P.C. BOARD (TOP VIEW) (BOTTOM VIEW) 2-60 2-61...
  • Page 57 • CD P.C. BOARD (TOP VIEW) 2-62 2-63...
  • Page 58 • CD P.C. BOARD (BOTTOM VIEW) 2-64 2-65...

  • Page 60: Section 3. Exploded Views

    SECTION 3. EXPLODED VIEWS ❏ CABINET AND MAIN FRAME SECTION...

  • Page 61: Tape Deck Mechanism (A/R & A/S : Left A/S Deck)

    ❏ TAPE DECK MECHANISM (A/R & A/S : LEFT A/S DECK) LOCA. NO. LG PART NO. DESCRIPTION SPECIFICATION 6720AG0013A Audio Deck CWN42FR605 TOKYO PIGEON L-DOUB 6768RZUP01A Deck Mechanism Parts 50-093-4XXXX PIGEON UNIT PCB A 6768R-EP05A Deck Mechanism Parts 50-093-41234 PIGEON HEAD ASSY...
  • Page 62 ❏ TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK) LOCA. NO. LG PART NO. DESCRIPTION SPECIFICATION 6720AG0013A Audio Deck CWN42FR605 TOKYO PIGEON L-DOUB 6768RZHP02A Deck Mechanism Parts ASSY B-DECK PIGEON HEAD 6768R-PP03A Deck Mechanism Parts 33-160-4309 PIGEON PRESS CASSE...
  • Page 63 ❏ DECK MECHANISM EXPLODED VIEWS...

  • Page 64: Speaker

    ❏ SPEAKER (MODEL:LMS-U1060/LMS-U560/LMS-U360) RIGHT LEFT 861 RIGHT LEFT RIGHT LEFT - 3-9 -...
  • Page 65 - 3-10 -...

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