LG CM7420 Service Manual
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LG CM7420 Service Manual

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Internal Use Only
Website http://biz.lgservice.com
Mini Hi-Fi System
SERVICE MANUAL
MODEL: CM7420
(CM7420, CMS7520F)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P
N /
O
:
A
F
N
75814469
JULY
,
2
0
1
2

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  • Page 1 Internal Use Only Website http://biz.lgservice.com Mini Hi-Fi System SERVICE MANUAL MODEL: CM7420 (CM7420, CMS7520F) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. 75814469 JULY...
  • 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 HIDDEN KEY MODE ........................... 1-6 SERVICE INFORMATION FOR EEPROM ..................1-7 PROGRAM DOWNLOAD GUIDE ......................1-8 1. AUDIO PROGRAM ........................... 1-8 2. CD PROGRAM ............................1-9 3. EQ PROGRAM ............................1-10 SPECIFICATIONS .............................

  • 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: Hidden Key Mode

    HIDDEN KEY MODE Push both Front key and RCU key to activate it for 5 seconds. 1. Disc Lock On/Off (CD Function Only Active) Front Key : STOP RCU Key : STOP 2. Check Version and Option code Front Key : STOP RCU Key : PLAY/PAUSE You can change [Audio MCU Version <->...

  • Page 8: Service Information For Eeprom

    SERVICE INFORMATION FOR EEPROM POWER ON FLD no disc status Remote control ‘ ’ + Front ‘STOP’ DETECT NEW EEPROM push at a time for 5 seconds (OPTION EDIT SCREEN) NAME FLD ‘OP-0…. Move to appropriate position and make changes with remote control. /■...

  • Page 9: Program Download Guide

    PROGRAM DOWNLOAD GUIDE 1. AUDIO PROGRAM Download program file name must be CM7520_YYMMDDX.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 10: Cd Program

    2. CD PROGRAM Download program file name must be HE003_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 11: Eq Program

    3. EQ PROGRAM Download program file name must be EQ_PRG.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 12: Specifications

    SPECIFICATIONS • GENERAL Power requirements Refer to main label Power consumption Refer to main label Dimensions (W x H x D) 285 x 349 x 370 Net Weight (Approx.) 5.6 kg Operating temperature 5 °C to 35 °C (41 °F to 95 °F) Operating humidity 5 % to 90 % Bus Power Supply...
  • Page 13 MEMO 1-12...
  • Page 14 SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ............................. 2-3 1. CABINET AND MAIN FRAME SECTION (CM7420) ................2-3 2. MECHANISM DECK SECTION (DP-12A) ....................2-5 3. PACKING ACCESSORY SECTION ......................2-7 4. SPEAKER SECTION ..........................2-8...
  • Page 15 MEMO...

  • Page 16: Exploded Views

    EXPLODED VIEWS NOTES) THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED 1. CABINET AND MAIN FRAME SECTION (CM7420) TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. CABLE6 CABLE4 CABLE5 CABLE7 VOLUME SMPS...

  • Page 17: Mechanism Deck Section (Dp-12A)

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

  • Page 18: Packing Accessory Section

    3. PACKING ACCESSORY SECTION 801 Owner’s Manual 808 Battery 824 AM Loop Antenna 825 FM Wire Antenna 900 Remote Control 803 Packing 804 Bag 803 Packing 802 Box...

  • Page 19: Speaker Section

    4. SPEAKER SECTION . FRONT SPEAKER (CMS7520F)
  • Page 20 SECTION 3 ELECTRICAL CONTENTS TRAINING MASTER ........................... 3-2 1. NO SOUND FROM SPEAKERS ......................3-2 2. NO SOUND IN AUX FUNCTION ......................3-3 3. NO SOUND IN PORT. IN FUNCTION ....................3-4 4. NO SOUND IN AM/FM FUNCTION ....................... 3-5 5.

  • Page 21: Training Master

    TRAINING MASTER 1. NO SOUND FROM SPEAKERS Make sure to connect the cables to each specified Are the speaker cables connected correctly connector tightly on the unit. between the speaker terminals on the unit Connect the woofer cables to the WOOF SYSTEM and the speakers? connectors on the rear panel.

  • Page 22: Sound In Aux Function

    TRAINING MASTER 2. NO SOUND IN AUX FUNCTION Make sure to connect some cables Does the customer select correctly between the AUX IN jacks of the unit the AUX function he or her wants to listen to? and the Audio output jacks of a external Audio device. After pressing the FUNCTION, Make sure to select the AUX IN function is “AUX”...

  • Page 23: Sound In Port. In Function

    TRAINING MASTER 3. NO SOUND IN PORT. IN FUNCTION Make sure to connect a cable Does the customer select correctly between the PORT. IN jack of the unit and the Audio the PORT. IN function he or her wants to listen to? output jack of a portable device like a MP3 player.

  • Page 24: Sound In Am/Fm Function

    TRAINING MASTER 4. NO SOUND IN AM/FM FUNCTION Does the customer select correctly Make sure to connect AM/FM antennas the AM/FM function he or she wants to listen to? on the rear panel of the unit. Make sure to select AM or FM function Is “AM or FM”...

  • Page 25: Sound In Cd Function

    TRAINING MASTER 5. NO SOUND IN CD FUNCTION Does the customer select correctly Make sure to put on a CD disc on the tray. the CD function he or she wants to listen to? Is a CD disc put on the tray correctly? Make sure to insert the CD disc upside down.
  • Page 26 TRAINING MASTER TRAINING MASTER Maker sure to connect the cables Are the speaker cables connected correctly to each specified connector tightly on the unit. between the speaker terminals on the unit Connect the woofer cables to the WOOF SYSTEM and the speakers? connectors on the rear panel.

  • Page 27: Sound In Usb Function

    TRAINING MASTER 6. NO SOUND IN USB FUNCTION Does the customer select correctly Make sure to insert a USB into the USB ports. the USB function he or she wants to listen to? Make sure to select the USB function Is “USB”...

  • Page 28: Power

    TRAINING MASTER The sound is output from the speakers. Sound OK 7. NO POWER Is the power cord plugged Make sure to plug the power cord of the unit into a electrical outlet? into a electrical outlet. If the customer can not see the red light Does the Standby LED light on the front panel, the SMPS might have any problem.

  • Page 29: 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, TH902 on SMPS board. 1-1-2.
  • Page 30 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. D951 / D952, ZD951 1-2-1. Solution Please check and replace D951 / D952, ZD951 on SMPS board. 1-2-2.

  • Page 31: 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 (IC101) 2-1-1. Solution Please check and replace IC101 on MAIN board. 2-1-2.

  • Page 32: 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 DIG301 on FRONT board. 3-1-2.
  • Page 33 ONE POINT REPAIR GUIDE 4. NO BOOTING IN CD/USB FUNCTION After you turn on power key and displayed message in the following order (HELLO --> VOL XX --> CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally. 4-1.

  • Page 34: Booting In Cd/Usb Function

    ONE POINT REPAIR GUIDE NO BOOTING IN CD/USB FUNCTION After you turn on power key and displayed message in the following order (HELLO --> VOL XX --> CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally. 4-2.
  • Page 35 ONE POINT REPAIR GUIDE NO BOOTING IN CD/USB FUNCTION After you turn on power key and displayed message in the following order (HELLO --> VOL XX --> CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally. 4-3.
  • Page 36 ONE POINT REPAIR GUIDE NO BOOTING IN CD/USB FUNCTION After you turn on power key and displayed message in the following order (HELLO --> VOL XX --> CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally. 4-4.
  • Page 37 ONE POINT REPAIR GUIDE NO BOOTING IN CD/USB FUNCTION After you turn on power key and displayed message in the following order (HELLO --> VOL XX --> CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally. 4-5.
  • Page 38 ONE POINT REPAIR GUIDE 5. 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 39: 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 40 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 41 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 42 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 43 ONE POINT REPAIR GUIDE 6. NO SOUND There is no sound output in the CD FUNCTION, repair the set according to the follow- ing guide. 6-1. IN THE CD FUNCTION 6-1-1. Solution Please check and replace IC501, IC602, IC801 on MAIN board. 6-1-2.

  • Page 44: Sound

    ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the USB FUNCTION, repair the set according to the fol- lowing guide. 6-2-1. IN THE USB FUNCTION 6-2-1-1. Solution Please check and replace IC501, IC504 on MAIN board & IC3U01 on USB board. 6-2-1-2.
  • Page 45 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the USB FUNCTION, repair the set according to the fol- lowing guide. 6-2-2. IN THE USB FUNCTION 6-2-2-1. Solution Please check and replace IC501, IC504 on MAIN board & IC3U01 on USB board. 6-2-2-2.
  • Page 46 ONE POINT REPAIR GUIDE NO SOUND There is no sound output by DIGITAL AUDIO AMP DAMAGE, repair the set according to the following guide. 6-3. BY DIGITAL AUDIO AMP DAMAGE (IN ALL FUNCTIONS) 6-3-1. Solution Please check and replace IC701, IC702, IC703 on MAIN board. 6-3-2.
  • Page 47 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the AUX FUNCTION, repair the set according to the fol- lowing guide. 6-4. IN THE AUX FUNCTION 6-4-1. Solution Please check and replace IC202 on MAIN board. 6-4-2. How to troubleshoot (Countermeasure) 1) Check AUX_L/R signals to IC202 (Pin7, 8).
  • Page 48 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the PORT. IN FUNCTION, repair the set according to the following guide. 6-5. IN THE PORT. IN FUNCTION 6-5-1. Solution Please check and replace IC202 on MAIN board. 6-5-2.
  • Page 49 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the TUNER FUNCTION, repair the set according to the following guide. 6-6. IN THE TUNER FUNCTION 6-6-1. Solution Please check and replace IC202, TU101 on MAIN board. 6-6-2. How to troubleshoot (Countermeasure) 1) Check if TUNER_LR is entered from Pin1 &...
  • Page 50 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the MIC IN FUNCTION, repair the set according to the following guide. 6-7. IN THE MIC IN FUNCTION 6-7-1. Solution Please check and replace IC603, IC605 on MAIN board. 6-7-2.

  • Page 51: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER SUPPLY ON SMPS BOARD No output 5.7 VA Replace F901 (same fuse). F901 normal? Replace BD901. BD901 normal? D904 normal? Replace D904. Replace D933, D937. D933, D937 normal? Power line of MAIN PCB is short. 3-32...
  • Page 52 ELECTRICAL TROUBLESHOOTING GUIDE No output 12 V F901 normal? Replace F901 (same fuse). Replace BD901. BD901 normal? Replace D904. D904 normal? Replace D934, D935. D934, D935 normal? Replace IC931. IC931 normal? Power Line of Main PCB is short. 3-33...
  • Page 53 ELECTRICAL TROUBLESHOOTING GUIDE No output FL+ / FL- P-CTRL OK? Check 12 V output & P-CTRL. D931, D932 Replace D931, D932. Replace ZD931. ZD931 OK? Replace FR931. FR931 short? Check soldering of PN901. 3-34...
  • Page 54 ELECTRICAL TROUBLESHOOTING GUIDE No AMP Output Is the P-CTRL OK? VCC supplied to Check 3.3 V & P-CTRL. IC911 Pin7? Q901,D904 Replace D904, Q901, PC911. ZD912, ZD913 Replace ZD912, ZD913. OK ? D951, D952 Replace D951, D952. OK ? Check soldering of CN902. 3-35...

  • Page 55: System Part

    ELECTRICAL TROUBLESHOOTING GUIDE 2. SYSTEM PART Power on. CN301 “HELLO” cable connection Display on FLD Check FFC cable (17P). CN301 Pin15, 16, 17 power Check SMPS board. CN301 Pin8, 9, 10 data signal Check MAIN board. Port P1~G15 of Replace IC301. DIG301 is OK? Replace DIG301.

  • Page 56: Audio Part

    ELECTRICAL TROUBLESHOOTING GUIDE 3. NO AUDIO PART CD FUNCTION Is motor_open/ close OK? LOAD +- OK? disc insert? (IC408 Pin9,10) Check IC501. Is motor impedance Check Loading motor. about 12 Ω? Check IC408. Focusing/ OPU driving Tracking/ Sled Signal Disc reading OK? (Focusing &...
  • Page 57 ELECTRICAL TROUBLESHOOTING GUIDE USB play IC501 Check IC501. Pin16,18 USB_HUB_D output signal OK? IC3U01 When insert USB power +5 VU Replace IC3U01. USB,IC504 Pin1,2,3,4 USB_D signal OK? IC202 Pin7,8 AUX input signal Check audio cable. IC202 Check IC501. Pin42,43,44 I2S input signal IC202 Replace IC202.
  • Page 58 ELECTRICAL TROUBLESHOOTING GUIDE POT. IN IC202 Pin21,22 POT. IN input signal Check MIC board. IC202 Check IC501. Pin42,43,44 I2S input signal IC202 Replace IC202. Pin41 ADC data output signal TUNER TU101 IC202 TUNER_L/R output Pin23,24 TUNER_L/R input Check +3.3 V of TU101. signal OK? signal OK? IC202...
  • Page 59 ELECTRICAL TROUBLESHOOTING GUIDE IC501 Replace IC501. Pin4, 5, 6 I2S data output signal OK? IC507 Check IC507. Pin2, 17 DAC_BCK/LRCK input signal OK? IC507 Replace IC507. Pin7,14 BEAT_LRCK/BCK output signal OK? IC501 Check IC501. Pin6 BEAT_DAC_DATA output signal OK? IC801 Check IC501.

  • Page 60: Digital Audio Amp Check

    ELECTRICAL TROUBLESHOOTING GUIDE 4. DIGITAL AUDIO AMP CHECK IC602 I2S input signal Check IC801 & IC501. IC602 PWM data output signal Replace IC602. IC701 IC702 FL± / FR± input signal SW1± input signal Check IC602. +12 VA, +50 V Check SMPS. Power voltage OK? IC701 IC702...

  • Page 61: Waveforms

    WAVEFORMS 1. SERVO WAVEFORM Figure 1-1. CD-16M Figure 1-2. Servo - FE, TE, FOD, RF IC407 pin31 IC407 pin61, pin62, pin63 / IC408 pin1 3-42...
  • Page 62 2. MOTOR DRIVE WAVEFORM Figure 2-1. SP- & SP+ for driving Spindle motor Figure 2-2. SL- & SL+ for driving Spindle motor IC408 pin17, pin18 IC408 pin11, pin12 Figure 2-3. LO- & LO+ for driving Tray motor IC408 pin9, pin10 3-43...
  • Page 63 3. AUDIO PATH WAVEFORM LRCK LRCK DATA DATA Figure 3-1. CD-I2S Figure 3-2. IC407 pin34, pin35, pin36 IC501 pin95, pin96, pin97 AUDIO_L LRCK AUDIO_R DATA Figure 3-3. Figure 3-4. AUDIO_L/R IC602(PWM IC) pin4, pin5, pin6, pin9 3-44...
  • Page 64 4. ADC WAVEFORM LRCK DATA DATA Figure 4-1. ADC I2C Figure 4-2. ADC I2S IC202 pin1, pin2 IC202 pin41, pin42, pin43, pin44 3-45...
  • Page 65 5. USB WAVEFORM 6. CRYSTAL WAVEFORM Figure 5. USB D+/D- Figure 6. 12 MHz crystal CN502 pin1, pin2 & pin4, pin5 IC501 pin27, pin28 3-46...

  • Page 66: Wiring Diagram

    WIRING DIAGRAM P/UP 3-47 3-48...

  • Page 67: Block Diagrams

    BLOCK DIAGRAMS 1. SMPS BLOCK DIAGRAM MAIN STR-A6053 for Main Power TRANS Rectifier Circuit (Bridge, CAPACITOR) Filter Section (Varistor, Resistor, Line Filter Snubber Thermistor) Digital TRANS AMP Power & Power MAIN NCP1252 Control IC & 3-49 3-50...

  • Page 68: Main System Block Diagram

    2. MAIN SYSTEM BLOCK DIAGRAM A,B,C,D,E,F,PD USB1 USB2 IC407 16.9344MHz 15pF BU9543KV SPDO/SLDO/FOD/TRD RF+ SERVO P/UP IC504 USB2512 LOAD ,SLED , USB HUB SPIN ,TR ,F IC408 MOT_MUTE,CLOSE,OPEN S3053 USB_HUB_DP/DN Motor Drive USB_RESET/SCL/SDA OP_SW,CL_SW,UP_SW,DN_SW,D_SE NSE DRM_WEN/CAS/RAS/SEL/CLK/CKE IC501 IC502 MLC3700 M00_15/A00_16 M12L6464A MCS LOGIC ADC_PWM_CLK/BCK/LRCK/DAT,...

  • Page 69: 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 70: Main - Micom Circuit Diagram

    2. MAIN - MICOM CIRCUIT DIAGRAM MICOM EAX64550401_Rev1.2-SD(#1) 2012. 01. 09 3-55 3-56...

  • Page 71: Main - Pwm / Filter Circuit Diagram

    3. MAIN - PWM / FILTER CIRCUIT DIAGRAM EAX64550401_Rev1.2-SD(#2) 2012. 01. 09 3-57 3-58...

  • Page 72: Main - Ir Amp Circuit Diagram

    4. MAIN - IR AMP CIRCUIT DIAGRAM EAX64550401_Rev1.2-SD(#3) 2012. 01. 09 3-59 3-60...

  • Page 73: Main - Dsp / Usb / Ipod Circuit Diagram

    5. MAIN - DSP / USB / IPOD CIRCUIT DIAGRAM EAX64550401_Rev1.2-SD(#4) 2012. 01. 09 3-61 3-62...

  • Page 74: Main - Rf Servo Circuit Diagram

    6. MAIN - RF SERVO CIRCUIT DIAGRAM RF SERVO EAX64550401_Rev1.2-SD(#5) 2012. 01. 09 3-63 3-64...

  • Page 75: Main - Adc Circuit Diagram

    7. MAIN - ADC CIRCUIT DIAGRAM EAX64550401_Rev1.2-SD(#6) 2012. 01. 09 3-65 3-66...

  • Page 76: Main - Beat Box Circuit Diagram

    8. MAIN - BEAT BOX CIRCUIT DIAGRAM BEAT BOX EAX64550401_Rev1.2-SD(#7) 2012. 01. 09 3-67 3-68...

  • Page 77: Front - Vfd Circuit Diagram

    9. FRONT - VFD CIRCUIT DIAGRAM EAX64632201_Rev1.3(2)-SD 2012. 02. 23 3-69 3-70...

  • Page 78: Front - Volume Circuit Diagram

    10. FRONT - VOLUME CIRCUIT DIAGRAM VOLUME EAX64632301_Rev1.3(2)-SD 2012. 02. 23 3-71 3-72...

  • Page 79: Front - Mic & Portable Circuit Diagram

    11. FRONT - MIC & PORTABLE CIRCUIT DIAGRAM MIC & PORTABLE EAX64632401_Rev1.3(2)-SD 2012. 02. 23 3-73 3-74...

  • Page 80: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART 1. ICs IC Sym IC Name / Type Vcc/Vdd IC Sym IC Name / Type Vcc/Vdd IC Sym IC Name / Type Vcc/Vdd 74AHC244FT Spec: TYPE:20P LC87F5NC8A Spec: Spec: VIN: 2~5.5V Spec: IC408 S3053 IC803 VENDER: TOSIBA IC101 (SANYO) VCC1,2: 4.3 ~...
  • Page 81 MEMO 2. CAPACITORS Value Value Voltage Measured Voltage Measured Location Capacitor Location Capacitor Spec voltage Spec voltage (uF) (uF) <MAIN> C244 100uF 5.61 C122 100uF 3.31 C231 47uF 5.08 C151 47uF 3.43 C236 10uF 5.19 C124 1000uF 3.41 <VFD> C601 100uF 3.32 C243...

  • Page 82: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. SMPS P.C.BOARD (TOP VIEW) 3-79 3-80...
  • Page 83 SMPS P.C.BOARD (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 3-81 3-82...

  • Page 84: Main P.c.board

    2. MAIN P.C.BOARD (TOP VIEW) 3-83 3-84...
  • Page 85 MAIN P.C.BOARD (BOTTOM VIEW) 3-85 3-86...

  • Page 86: Front_Vfd P.c.board

    3. FRONT_VFD P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-87 3-88...

  • Page 87: Front_Mic & Portable P.c.board

    4. FRONT_MIC & PORTABLE P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-89 3-90...
  • Page 88 5. FRONT_VOLUME P.C.BOARD (TOP VIEW) 3-91 3-92...

  • Page 89: Front_Volume P.c.board

    FRONT_VOLUME P.C.BOARD (BOTTOM VIEW) 3-93 3-94...

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