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Summary of Contents for LG CM2520
- Page 1 Internal Use Only Website http://biz.lgservice.com Micro Hi-Fi System SERVICE MANUAL MODEL: CM2520 (CM2520, CMS2520) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN75734072 APRIL, 2012...
- Page 2 CONTENTS SECTION 1 ..GENERAL SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..REPLACEMENT PARTS LIST...
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Page 3: Table Of Contents
SECTION 1 SUMMARY CONTENTS SERVICING PRECAUTIONS ........................1-3 ESD PRECAUTIONS ..........................1-5 SERVICE INFORMATION FOR EEPROM ..................1-6 PROGRAM UPDATE GUIDE ........................1-7 SPECIFICATIONS ............................1-8... -
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.
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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 Display "NO DISC" status Set Front ‘STOP’ Key + Remote control ‘FWD SKIP’ Key DETECT NEW EEPROM push same timing during 5s NAME 00000 (FM) 00001 (FM-NO IPOD) FLD ‘OPT-XXXX’ 01000 (FM_RDS) 10100 (FM_AM) D1000 (FM_DAB) Press SET Front "Play"... -
Page 8: Program Update Guide
PROGRAM UPDATE GUIDE HOW TO UPDATE MCS PROGRAM (1) Change the file name to download as “(MODEL NAME)__(function)_(Version).mcs”. ex) CM2520_XXXX_XX.mcs (2) Copy the file to the root folder of USB storage. (3) Put the USB into the set. Change set function to USB function. Then the upgrade process will be started with the upgrade intormation. -
Page 9: Specifications
SPECIFICATIONS • GENERAL Power supply 100 - 240 V, 50 / 60 Hz or 200 - 240 V, 50 / 60Hz Power consumption 35 W Net Weight 2.3 kg External dimensions (W x H x D) 230 x 125 x 243 mm Operating conditions Temperature 5 °C to 35 °C (41 °F to 95 °F) Operating humidity... - Page 10 SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ............................. 2-3 1. CABINET AND MAIN FRAME SECTION (CM2520) ................2-3 2. PACKING ACCESSORY SECTION ......................2-7 3. SPEAKER SECTION (CMS2520) ......................2-8...
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Page 12: Exploded Views
EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION (CM2520) NOTES) THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. CABLE10 CABLE12 IPOD CABLE11 SMPS FRONT... - Page 13 MEMO MEMO...
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Page 14: Packing Accessory Section
2. PACKING ACCESSORY SECTION 801 Instruction Ass'y 900 Remote Control 808 Battery 803T Packing 804 Bag 803B Packing 802 Box... -
Page 15: Speaker Section (Cms2520)
3. SPEAKER SECTION (CMS2520) A60L A60R... - Page 16 SECTION 3 ELECTRICAL CONTENTS ELECTRICAL TROUBLESHOOTING GUIDE ..................3-2 1. SMPS PART ............................3-2 2. MUTE CIRCUIT ............................3-4 3. AMP ABNORMAL ........................... 3-5 4. FUNCTION MODE AUDIO ABNORMAL ....................3-6 5. CD PART ..............................3-7 6. CD READING CHECK..........................3-8 7.
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Page 17: Electrical Troubleshooting Guide
ELECTRICAL TROUBLESHOOTING GUIDE 1. SMPS PART +3.3 VA C912, IC903 Replace C912, IC907. normal? D908, C910 Replace D905, C916, C917. normal? IC909, PC902 Replace IC902, PC901. normal? Is VCC (130V-340V) Is VCC (9.5V-26V) supplied to IC901 Pin2? supplied to IC901 Pin5? Replace C953, C926, ZD904, R907, D902. - Page 18 ELECTRICAL TROUBLESHOOTING GUIDE +PVDD (20.5 V) C918, C916, C902, Replace C918, C916, C902, C905, C917. C905, C917 normal? D913, D914 Replace D913, D914. normal? IC908, PC901 Replace IC908, PC901. normal? Is VCC (130V-340V) supplied to IC901 Pin1? Is VCC (9.5V-26V) supplied to IC901 Pin3? Replace ZD903, C923, Q907, D906, C909.
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Page 19: Mute Circuit
ELECTRICAL TROUBLESHOOTING GUIDE 2. MUTE CIRCUIT Mute abnormal Check output signal Check the speakers connection. IC704 Pin31. Check input signal Replace FB314. of FB314. Check output signal Replace IC107. IC107 Pin90. Mute... -
Page 20: Amp Abnormal
ELECTRICAL TROUBLESHOOTING GUIDE 3. AMP ABNORMAL AMP abnormal Check output signal Check the speakers connection. L700 ~ L703. Check input signal of Check L700 ~ L703, C777, C778. IC704 Pin6, 9 ,10,13. Replace L700 ~ L703,C777, C778. Check the "High" PWR Check the "PWM"... -
Page 21: Function Mode Audio Abnormal
ELECTRICAL TROUBLESHOOTING GUIDE 4. FUNCTION MODE AUDIO ABNORMAL AUX abnormal Check the input signal of IC700 Check the input signal of CON102 Pin6, 8. Pin11, 4. Check the input signal R317, R318. Check the input signal JK302 Pin2, 4. Tuner abnormal Check the input signal of IC700 Pin12, 1. -
Page 22: Cd Part
ELECTRICAL TROUBLESHOOTING GUIDE 5. CD PART Turn on CD Check IC107 Pin127. Check Open / Close. (Open 3.3 V, Close 0 V) Check IC107 Pin127. Check "READING " display. (Open 3.3 V, Close 0 V) Check Check connector CON801. Reading OK. Check the pick-up movement. -
Page 23: Cd Reading Check
ELECTRICAL TROUBLESHOOTING GUIDE 6. CD READING CHECK Connector locking check (CON800,CON801,CON802) Does Check CN1 Pin1, 2 (SL-, SL+). Check IC800 Pin48, 49 signal. sled motor move? Defective Check IC800 pick-up or IC801(Pin11,12). Pin41 “DAC_MCLK”, Check IC800 Pin18 “CD_MCK”, Pin36“CD_BCK”, Pin35“CD_LRCK” Pin19 “CD_DIN_OUT”, Pin21 “CD_BUSY”... -
Page 24: Usb Part
ELECTRICAL TROUBLESHOOTING GUIDE 7. USB PART Turn on USB Check Check power supply circuit "CHECKING" or "USB" display check. connector CON102. (CON102 Pin1, USB +5 V). Check IC107 (Pin116, 117) circuit. Check Check Check reading OK. CON102 Pin3, 2 (D+, D-) signal. IC107 (Pin116, 117) circuit. -
Page 25: Lcd Display Check
ELECTRICAL TROUBLESHOOTING GUIDE 8. LCD DISPLAY CHECK LCD abnormal Replace IC301. Check Check IC301 IC301 Pin1 “LCD-CS”,Pin3 “LCD-WR” IC301 Pin7 VCC normal? Pin4 “LCD-DATA” (3.3V). signal. Normal. Check Check chip bead FB313. CON301 Pin9. Check SMPS part. Check CON301 Pin4 “VFD_CLK”, Check R310 ~ R312. -
Page 26: Ipod Part
ELECTRICAL TROUBLESHOOTING GUIDE 9. IPOD PART Turn on IPOD Check CON200. Check Check the "High" DET Check the IP +5 V, CON200 of CON200 Pin1. display. Pin7, 8 Check JK200. Check Check Check CON200, IC101(Pin5, 76, 77) reading OK. CON200 Pin3, 4 (RX, TX) signal. Normal. -
Page 27: Waveforms
WAVEFORMS 1. CD SEARCHING WAVEFORM IC800 PIN61 EE IC800 PIN62 TE IC800 PIN60 FE 2. SPINDLE DRIVE & MOTOR WAVEFORM IC801 PIN12 SL- IC801 PIN11 SL+ IC801 PIN18 SP- IC801 PIN17 SP+ 3-12... -
Page 28: Cd Playing Waveform
3. CD PLAYING WAVEFORM IC800 PIN62 TE IC800 PIN61 EE IC800 PIN60 FE IC801 PIN17 SP+ IC801 PIN14 TD IC801 PIN13 FD 3-13... -
Page 29: Cd Stop Action Waveform
4. CD STOP ACTION WAVEFORM IC801 PIN17 SP+ IC801 PIN11 SLE+ IC801 PIN16 T+ IC801 PIN14 F+ 5. CD READING WAVEFORM IC800 PIN18 MCK IC800 PIN19 DIN IC800 PIN20 RW IC800 PIN21 BUSY 3-14... -
Page 30: Cd Playing Rf Waveform
IC800 PIN35 LRCK IC800 PIN36 BCK IC800 PIN18 MCK IC800 PIN34 DATA 6. CD PLAYING RF WAVEFORM IC800 PIN63 RF 3-15... -
Page 31: Usb Operating Waveform
7. USB OPERATING WAVEFORM CON102 PIN3 D- CON102 PIN1 +5V CON102 PIN2 D+ 8. RADIO OPERATING WAVEFORM TU400 PIN2 DA TU400 PIN8 RST TU400 PIN1 SCK 3-16... -
Page 32: Wiring Diagram
WIRING DIAGRAM CON700 FFC, 6P MAIN CON800 FFC, 24P CON802 WIRE, 5P SMPS WIRE, 15P WIRE, 3P WIRE, 8P WIRE, 10P IPOD CN903 CN902 CON102 CON105 WIRE, 13P WIRE, 12P FRONT CON301 3-17 3-18... -
Page 33: Block Diagram
BLOCK DIAGRAM 16.93MHZ R/L, A,B,C,D,E,F ANALOG L-CH/ R-CH P/UP R/L, SLDO SPDO CLASS-D AMP STA339BW TDA7492 USB CON 3.3V +6.2V +12V SMPS +24V POWER F+/F- 3-19 3-20... -
Page 34: 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 35: Main - Mcu Circuit Diagram
2. MAIN - MCU CIRCUIT DIAGRAM : WAVEFORM NUMBER 2012. 02. 09 3-23 3-24... -
Page 36: Main - Dsp Circuit Diagram
3. MAIN - DSP CIRCUIT DIAGRAM 2012. 02. 09 3-25 3-26... -
Page 37: Main - Servo Circuit Diagram
4. MAIN - SERVO CIRCUIT DIAGRAM 19 20 21 12 13 : WAVEFORM NUMBER SERVO 2012. 02. 09 3-27 3-28... -
Page 38: Main - Amp Circuit Diagram
5. MAIN - AMP CIRCUIT DIAGRAM 2012. 02. 09 3-29 3-30... -
Page 39: Main - D/A Circuit Diagram
6. MAIN - D/A CIRCUIT DIAGRAM 2012. 02. 09 3-31 3-32... -
Page 40: Main - Tuner Circuit Diagram
7. MAIN - TUNER CIRCUIT DIAGRAM : WAVEFORM NUMBER TUNER 2012. 02. 09 3-33 3-34... -
Page 41: Display Circuit Diagram
8. DISPLAY CIRCUIT DIAGRAM VFD301 9-BT-200-NK FB301 300RH C301 C316 104PF R328 1R 0.5W R1206 FB302 300RH TO:MAIN PCB FB312 300RH FGND FB310 300RH VFD_CS SSTB FB311 300RH VFD_DATA CDAT IC3.3V FB309 300RH VFD_WR CCLK R400 C305 C315' FB308 C320 C319 300RH 0.1uF... -
Page 42: Ipod Circuit Diagram
9. IPOD CIRCUIT DIAGRAM FB206 300RH SET-GND MARK MARK JK200 MARK IPOD_JACK_DIP MARK CM2520(NC) DM2520(ADD) VIDEO CM2520(NC) VIDEO FB203 DM2520(ADD) 1K 100M C200 R218 R217 104P Q202 2SK3019 R215 IP-DET A_ACCDET IP-TX IP-RX R201=75K,CHARGE I=500mA R202=43.2K,CHARGE I=1A D_ACCCET ACC-POWER R210... -
Page 43: Circuit Voltage Chart
CIRCUIT VOLTAGE CHART 1. ICs 2. TRs Location Pin No. Spec. 80 Volt 288 Volt Location Pin No. Spec. 80 Volt 288 Volt Pin No. Spec. Voltage Input Voltage: 80 V / 60 Hz, 288 V / 50 Hz Input Voltage: 80 V / 60 Hz, 288 V / 50 Hz Q902 S8550 PNP IC101 S3F84I9 (MCU IC) IC701 MC4580 (SOUND AMP) - Page 44 3. DIODES 5. CONNECTORS Positive (+) Negative (-) Positive (+) Negative (-) Location No. Value (uF) Voltage_Spec. Positive (+) Connector No. Pin NO. SPEC Value (V) Type SPEC 80 V / 60 Hz 288 V / 50 Hz Input Voltage: 288 V /50 Hz Input Voltage: 240 V / 50 Hz D901 UF4007...
- Page 45 CONNECTORS Connector No. Pin NO. SPEC Value (V) Connector No. Pin NO. SPEC Value (V) Input Voltage: 240 V / 50 Hz Input Voltage: 240 V / 50 Hz Main 1PIN VFDPWR 0-3.3V 3.09 1PIN IP-DET 0-3.3V 3.25 2PIN MAINPWR 0-3.3V 3.23 2PIN A_ACC...
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Page 46: Printed Circuit Board Diagrams
PRINTED CIRCUIT BOARD DIAGRAMS 1. SMPS P.C.BOARD 3-45 3-46... -
Page 47: Main P.c.board
2. MAIN P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-47 3-48... -
Page 48: Display P.c.board
3. DISPLAY P.C.BOARD 5. IPOD P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 4. USB P.C.BOARD 3-49 3-50... - Page 49 MEMO MEMO 3-51 3-52...