LG CM4520 Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Stereo System
  5. CM4520
  6. Service manual

LG CM4520 Service Manual

Hide thumbs Also See for CM4520:
Table of Contents

Advertisement

Quick Links

Download this manual
Internal Use Only
Website http://biz.lgservice.com
Mini Hi-Fi System
SERVICE MANUAL
MODEL: CM4520
(CM4520, CMS4520F/W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN75734055
FEBRUARY, 2012

Advertisement

Table of Contents
loading

Related Manuals for LG CM4520

Summary of Contents for LG CM4520

  • Page 1 Internal Use Only Website http://biz.lgservice.com Mini Hi-Fi System SERVICE MANUAL MODEL: CM4520 (CM4520, CMS4520F/W) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN75734055 FEBRUARY, 2012...
  • Page 2 CONTENTS SECTION 1 ..GENERAL SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..REPLACEMENT PARTS LIST...

  • Page 3: Table Of Contents

    SECTION 1 SUMMARY CONTENTS SERVICING PRECAUTIONS ........................1-3 ESD PRECAUTIONS ..........................1-5 SERVICE INFORMATION FOR EEPROM ..................1-6 PROGRAM DOWNLOAD GUIDE ......................1-7 1. AUDIO PROGRAM ........................... 1-7 2. CD PROGRAM ............................1-8 3. EQ PROGRAM ............................1-9 SPECIFICATIONS ............................. 1-10...

  • Page 4: Servicing Precautions

    SERVICING PRECAUTIONS 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 5 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 6: Esd Precautions

    ESD PRECAUTIONS 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 integrated 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 7: Service Information For Eeprom

    SERVICE INFORMATION FOR EEPROM POWER ON FLD no disc status or AUX status. Remote control ‘Fwd skip’ + Front ‘STOP’ DETECT NEW EEPROM push same timing during 5 seconds. (OPTION EDIT SCREEN) NAME OPT0 FLD ‘OP-0…. OPT1 OPT2 OPT3 OPT4 Move to appropriate position and OPT5 make changes with remote control...

  • Page 8: Program Download Guide

    PROGRAM DOWNLOAD GUIDE 1. AUDIO PROGRAM Download program file name must be CM4320_***.HEX If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device.

  • Page 9: Cd Program

    2. CD PROGRAM Download program file name must be HE001_DATE_00.BIN If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Caution: When downloading the file, you should neither unplug the usb device, change to the other function, nor power off the device.

  • Page 10: Eq Program

    3. EQ PROGRAM Download program file name must be EQ_PRG_CM4520_CMS4520_201111240_31B0.BIN If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Caution: When downloading the file, you should neither unplug the usb device, change to the other function, nor power off the device.

  • Page 11: Specifications

    SPECIFICATIONS • GENERAL Power requirements Refer to main label Power consumption Refer to main label Dimensions (W x H x D) 202 X 300 X 297 mm Net Weight (Approx.) 2.85 kg Operating temperature 5 °C to 35 °C (41 °F to 95 °F) Operating humidity 5 % to 90 % Bus Power Supply (USB)
  • Page 12 SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ............................. 2-3 1. CABINET AND MAIN FRAME SECTION (CM4520) ................2-3 2. MECHANISM DECK SECTION (DP-12AM) ..................... 2-5 3. PACKING ACCESSORY SECTION ......................2-7 4. SPEAKER SECTION ..........................2-8...
  • Page 13 MEMO...

  • Page 14: Exploded Views

    EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION (CM4520) NOTES) THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE 260L LITERATURE. SMPS CABLE2 FRONT 260R MAIN...

  • Page 15: Mechanism Deck Section (Dp-12Am)

    MEMO 2. MECHANISM DECK SECTION (DP-12AM) 015B 015A 012A...

  • Page 16: Packing Accessory Section

    3. PACKING ACCESSORY SECTION 801 Instruction Ass'y 824 AM Loop Antenna 808 Battery 900 Remote Control 825 FM Wire Antenna 803 Packing 804 Bag 803 Packing 802 Box...

  • Page 17: Speaker Section

    4. SPEAKER SECTION 4-1. FRONT SPEAKER (CMS4520F)
  • Page 18 4-2. SUBWOOFER (CMS4520W)
  • Page 19 MEMO 2-10...
  • Page 20 SECTION 3 ELECTRICAL CONTENTS ONE POINT REPAIR GUIDE ........................3-2 1. NO POWER ............................3-2 2. NO BOOTING WHEN POWER ON THE SET ..................3-4 3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET ..............3-5 4. NO OPERATION OF MD ........................3-6 5.

  • Page 21: One Point Repair Guide

    ONE POINT REPAIR GUIDE 1. NO POWER If the unit doesn’t work by no power problem, repair the set according to the following guide. 1-1. FUSE & BRIDGE DIODE 1-1-1. Solution Please check and replace F901, BD901, TH901 on SMPS board. 1-1-2.
  • Page 22 ONE POINT REPAIR GUIDE NO POWER If the unit doesn’t work by no power problem, repair the set according to the following guide. 1-2. D929 1-2-1. Solution Please check and replace D929 on SMPS board. 1-2-2. How to troubleshoot (Countermeasure) 1) Check the Anode-Cathod Voltage of D929 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.

  • Page 23: Booting When Power On The Set

    ONE POINT REPAIR GUIDE 2. NO BOOTING WHEN POWER ON THE SET The set doesn’t work when press the power button on the front board or the remote control. 2-1. FLASH MEMORY 2-1-1. Solution Please check and replace IC102 on MAIN board. 2-1-2.

  • Page 24: Vfd Is Not Displayed When Power On The Set

    ONE POINT REPAIR GUIDE 3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET When power on the set, any icons or characters on VFD are not displayed. 3-1. VFD 3-1-1. Solution Please check and replace DIG502 on FRONT board. 3-1-2.
  • Page 25 ONE POINT REPAIR GUIDE 4. NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the SPINDLE MOTOR among them.

  • Page 26: Operation Of Md

    ONE POINT REPAIR GUIDE NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the SLED MOTOR among them.
  • Page 27 ONE POINT REPAIR GUIDE NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the TRAY OPEN / CLOSE MOTOR among them.
  • Page 28 ONE POINT REPAIR GUIDE NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the LASER TRACKING ACTUATOR.
  • Page 29 ONE POINT REPAIR GUIDE NO OPERATION OF MD When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the LASER FOCUSING ACTUATOR.
  • Page 30 ONE POINT REPAIR GUIDE 5. NO SOUND There is no sound output in the CD FUNCTION, repair the set according to the follow- ing guide. 5-1. IN THE CD FUNCTION 5-1-1. Solution Please check and replace IC601, IC801 on MAIN board. 5-1-2.

  • Page 31: Sound

    5-2. BY DIGITAL AUDIO AMP DAMAGE (IN ALL FUNCTIONS) 5-2-1. Solution Please check and replace IC701, IC702(CM4520) on MAIN board. 5-2-2. How to troubleshoot (Countermeasure) 1) Check FL±, FR± & SW± signals from IC601 to IC701 & 702 each input function.
  • Page 32 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the USB FUNCTION, repair the set according to the fol- lowing guide. 5-3. IN THE USB FUNCTION 5-3-1. Solution Please check and replace IC801 on MAIN board & IC502 on USB board. 5-3-2.
  • Page 33 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the AUX FUNCTION, repair the set according to the fol- lowing guide. 5-4. IN THE AUX FUNCTION 5-4-1. Solution Please check and replace IC401 on MAIN board. 5-4-2. How to troubleshoot (Countermeasure) 1) Check AUX_L/R signals to IC401 (Pin7, 8).
  • Page 34 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the TUNER FUNCTION, repair the set according to the following guide. 5-5. IN THE TUNER FUNCTION 5-5-1. Solution Please check and replace IC401, TU100 on MAIN board. 5-5-2. How to troubleshoot (Countermeasure) 1) Check if TUNER_LR is entered from Pin1,3 of TU100 to IC401(Pin23, 24).

  • Page 35: Audio Electrical Troubleshooting Guide

    AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE 1. POWER (SMPS) No 3.7 VA F901 normal? Replace F901 (Use the same fuse). BD901 normal? Replace BD901. TH901 normal? Replace TH901. Is Vcc (10 V ~ 18 V) supplied to D904 normal? IC901 Pin7? Check or replace D904. D922 normal? Replace D922.
  • Page 36 AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE No PVDD F901 normal? Replace F901 (Use the same fuse). BD901 normal? Replace BD901. TH901 normal? Replace TH901. Is Vcc (10 V ~ 18 V) supplied to D905 normal? IC902 Pin7? Check or replace D905. Q910 base "H"? •...
  • Page 37 AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE No 12 V Is Vcc Check or replace D921. (15 V) supplied to Q953 collector? Is the Check P-CTRL “H” signal 13 V Supplied to Q953 from μ-COM. base? Check or replace Q953. No 5 V Is Vcc Check or replace D923.
  • Page 38 AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE No VFD Check or replace D925. D925 normal? Check or replace ZD951. ZD951 normal? Q951 normal? Check or replace Q951. Check or replace VFD. 3-19...

  • Page 39: Μ-Com Part Check

    AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE 2. μ-COM PART CHECK μ-COM PART CHECK Check if Refer to voltage of CN105 Pin10 SMPS troubleshooting. is 3.7 VA. Check Check if output of both end voltage of D105(MBR0540) is 3.7 V. D102, D105. Check if IC102_Pin49 and Check D102, D105.

  • Page 40: Fld Display Check

    AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE 4. FLD DISPLAY CHECK FLD DISPLAY CHECK Check CN105 Pin1,2,3 input Refer to SMPS troubleshooting. voltage. Check if both end voltage of FL+, FL- are over 2.9 V VKK : over 25.6 V. Check CN501 connection and power Check CN501 connection.

  • Page 41: Pwm Modulation Check

    AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE 5. PWM MODULATION CHECK PWM MODULATION PART CHECK Check Refer to CN105 Pin11 3.7 VA. SMPS troubleshooting. • Check IC601(PS9854) VDD 3.3 V (Pin16, 25, 30, 33, 37, 42, 50, 64, 67) • Check VDD Core 1.2 V (Pin1, 22, 45, 60,63) •...
  • Page 42 AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE Check Check IC601(PS9854) Refer to CD Assy communication input data CD troubleshooting. Pin4, 5, 6. Pin4, 5, 6 PWM wave. Check Check each line IC601(PS9854) input resistor output. data. Check Check modulator output Replace IC601(PS9854). IC601(PS9854). FL: Pin26(-),27(+) FR: Pin28(-),29(+) and others.

  • Page 43: Power Amp Part Check

    AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE 6. POWER AMP PART CHECK POWER AMP PART CHECK Check CN105 Pin6: +12 V Refer to SMPS troubleshooting. Pin14,15: 26 V. Check IC701, IC702 Pin29, 30, 31, 36, 37, 38 input voltage. Check IC701, IC702 Check each line resistor output voltage. Pin2: +12 V input.

  • Page 44: Tuner / Aux Function Check

    AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE 7. TUNER / AUX FUNCTION CHECK FUNCTION CHECK Check IC401 (CS5346) Pin7, 8, Check JK401,TU100. 23, 24 input. Check IC401 Check IC401 Check CN105 Pin7: +5 V Pin5: +5 V (CS5346) Pin9 output Pin9, 10: +3.3 V. Pin46: +3.3 V.

  • Page 45: Tuner Function Check

    AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE 8. TUNER FUNCTION CHECK TUNER FUNCTION CHECK Check tuner Check tuner module voltage module(TU100) (Pin4: +3.3 V). operation. Check IC102 Pin21, 22, 23, 24, 25 data in/output. Check tuner module data. Refer to function check. 3-26...

  • Page 46: Cdp Electrical Troubleshooting Guide

    CDP ELECTRICAL TROUBLESHOOTIHG GUIDE 1. CD FUNCTION CD FUNCTION Can the Is Motor_open/close Is load +,- ok? disc insert? OK? (IC301 Pin10,11) Check IC301. Is Motor ok? Check loading motor. (about 12 Ω) Focus/ Check IC301 OPU driving (Focus Disc reading tracking/sled signal (Motor drive IC).

  • Page 47: Double Usb Function

    CDP ELECTRICAL TROUBLESHOOTIHG GUIDE 2. DOUBLE USB FUNCTION USB FUNCTION Plug-in usb device. Display “NO USB”. Check USB_5V. Check CN502. Check USB_D+/D- Display “READ”. Check usb jack (JK501/ JK502). (R501,R502). Display “NO FILE”. Check IC801(Pin116, 117). Replace IC801. Check usb audio fi le in usb device (MP3, WMA fi...

  • Page 48: Waveforms

    WAVEFORMS 1. SDRAM IC802 Pin38 DATA IC802 Pin53 ADDRESS IC802 Pin35 IC803 Pin1 2. SERVO IC801 Pin63 CD-16M 3-29...
  • Page 49 IC302 Pin61 IC302 Pin62 IC302 Pin13 IC302 Pin63 3. AUDIO PATH CD_BCK IC801 Pin100 IC801 Pin102 CD_LRCK CD_DATA IC801 Pin101 3-30...
  • Page 50 DAC_MCLK IC801 Pin86 DAC_BCK IC801 Pin87 DAC_LRCK IC801 Pin88 DAC_DATA IC801 Pin83 4. USB USB_5V IC801 Pin116 IC801 Pin117 3-31...
  • Page 51 MEMO 3-32...

  • Page 52: Wiring Diagram

    WIRING DIAGRAM SPK TERMINAL JACK CD MD CN301 CN303 SMPS PCB MAIN + CD PCB CN102 CN101 CN502 CN501 2EA +FRONT PCB 3-33 3-34...

  • Page 53: Block Diagrams

    BLOCK DIAGRAMS 1. OVERALL BLOCK DIAGRAM 16.93MHZ 12.288MHZ A,B,C,D,E,F DECK MECHANISM BU9543KV DAC-BCK/LRCK/MCLK RF+ SERVO DSP TAS5612L DAC-DATA PS9854 P/UP SLED ,F ,T SLDO SPDO SPINDLE LOAD S3050 EEPROM 9.8304MHZ OP/CL SPI-DO/DI/CLK/ CS RESET; M ADC-RST I2S CLK MICOM MLC9800 OP/CL LI MIT ADC-DAT CS5346...

  • Page 54: Smps Block Diagram

    2. SMPS BLOCK DIAGRAM SMPS On/Off Snubber Block On/Off 5V LDO 5.6VA CN901 Main SMPS IC Regulation Block On/Off Block 3.7VA Noise Y-Cap Feedback Filter Photo coupler CD P.CTL Block (X-cap P.CTL Y-Cap Photo coupler On/Off Line Filter) Snubber Block PVDD SMPS IC With FET...

  • Page 55: Circuit Diagrams

    MODIFIED OR ALTERED WITHOUT PERMISSION IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. FROM THE LG CORPORATION. ALL COMPONENTS PERFORMANCE IMPROVEMENT CHANGES INTO SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL THE SET IS NOT DELAYED UNTIL THE NEW SERVICE TO THOSE IN THE ORIGINAL CIRCUIT.

  • Page 56: Main - Dsp Circuit Diagram

    2. MAIN - DSP CIRCUIT DIAGRAM : WAVEFORM NUMBER EAX64628501_SD(#1) 2012.01.06 3-41 3-42...

  • Page 57: Main - Micom Circuit Diagram

    3. MAIN - MICOM CIRCUIT DIAGRAM MICOM EAX64628501_SD(#2) 2012.01.06 3-43 3-44...

  • Page 58: Main - Amp Circuit Diagram

    4. MAIN - AMP CIRCUIT DIAGRAM EAX64628501_SD(#3) 2012.01.06 3-45 3-46...

  • Page 59: Main - Servo Circuit Diagram

    5. MAIN - SERVO CIRCUIT DIAGRAM SERVO : WAVEFORM NUMBER EAX64628501_SD(#4) 2012.01.06 3-47 3-48...

  • Page 60: Front Circuit Diagram

    6. FRONT CIRCUIT DIAGRAM FRONT EAX64628401_SD 2012.01.06 3-49 3-50...

  • Page 61: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART 1. IC Location Pin No. Specifi cation EE Mode (V) Margin Playback Mode (V) Margin Location Pin No. Specifi cation EE Mode (V) Margin Playback Mode (V) Margin IC101 EEPROM(M24C16) 22(GVDD_CD) 10.8~13.2 11.7 1.03 11.7 1.06 8(VCC) 1.8~5.5 29(PVDD_CD) 18~38...
  • Page 62 MEMO 2. CAPACITORS EEMode Play back Rec voltage Location Value (uF) Spec Margin Margin Margin C118 6.3V 3.5V 3.5V 2.8V 3.44V 3.44V 2.86V 3.39V 3.39V 2.91V 1000uF C302 100uF 0.22V 0.22V 15.78V 3.31 3.31 12.69V 3.26 0.03 3.23V 12.77V C304 100uF 1.65V 1.65V...

  • Page 63: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. SMPS P.C.BOARD (TOP VIEW) (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 3-55 3-56...

  • Page 64: Main P.c.board

    2. MAIN P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-57 3-58...

  • Page 65: Front P.c.board

    3. FRONT P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-59 3-60...

This manual is also suitable for:

Cms4520f/w

Table of Contents