PORTABLE CD CASSETTE RECORDER SERVICE MANUAL
Contents
1. 5 ROMA S 106110109 11705 110104 Uioi COST RWS Ri RIO 1 5201 0 AM FM POP B 12 saisie er sw EE EE m yv im FMB X 22K X e D o 2 220 Ton L cH E RZ kg 82 C730 R729 dul ges E cni 7 gt He o 11 x FM ANT w9 10 mA 1 Ix js 525 fa E Y D GND 299880 7 om oma cus 204 l5 CD FM AM TA 55 L m sw702 8 9 470 FIT oon 4 T quo ooo 4 XP o da 799993 0 0 Eee dep e 1 L CD PART m 4 W 90 Sid Ld 2507 passo 12. Is rotation normal Is HF signal normal without dropout No Check the change of 2 17 18 Yes No A N Yes m connector defective No IC1 Defective No IC2 Defective PICK UP defective Yes IC1 defective PICK UP defective 2 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes No ad LGE Internal Use Only When laser does not light Is pin90 voltage about 2 5V Nol ae No No Has pick up returned to the Are data transferrd form 12 IC1 defective innermost position Yes Does voltage appear at 2 17 PP 2 Defective No NEED Yes Slide motor defective Connector defective Does pick up stop after Are input output detected naving moved to the Yes at CON1 pins No LMT SW defective innermost position Connector defective OPEN CLOSE Yes IC1 defective Has laser power source 9 returned to the QS Connector defective Q5 collector voltage about 1 7V Yes Yes Q5 defective 1 Flow laser current laser def
3. SPECIFICATIONS General Power supply Power consumption Net Weight External dimensions W x H x D Output Power T H D 10 Speakers Battery Operation Tuner FM Tuning Range Intermediate Frequency Antenna Telescopic antenna AM Tuning Range Intermediate Frequency Antenna CD Frequency response 100 18000 Hz Signal to noise ratio T H D Cassette tape player Recording System Frequency Response 125 8000 Hz Signal to Noise Ratio Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes E Refer to the back panel of the unit Refer to the back panel of the unit 2 3 kg 330 x 166 x 148 mm 1WX2 8 0X2 DC 9V six C R14 batteries not supplied 65 108 MHz 87 5 108 0 MHz 10 7 MHz 522 1620 kHz or 520 1720 kHz 455 kHz Ferrite bar antenna 55 dB 0 5 4 Tracks 2 channel stereo 40 dB LGE Internal Use Only LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes SECTION 2 EXPLODED VIEWS CABINET AND MAIN FRAME oh NOTES THE EXCLAMATION POINT WITHIN AN gt EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE Copyright 2008 LG Electronics Inc All right reserved Only for traini
4. SS SSP alle jr rer 8 Um mpm 718 ris m Tz TR iii 18 md bi 5 en He wel 18 0 550028059 0 5 75 gt os 15 5 4 D I wl H 7 18 FE ES mi om ii 5 5 H zu 47 50 5 1 Tee E dh 7 7 E E i Pi 38237 8225 8 DM ps 2 25 H ser SUI zs on tou M gs a cs af E 86 i E 4 5 Les o 4 Lem nuu 1 Dt 1 i 3 v jo 9 8 1 i L Qu add 1 X 77 156 7 2 585 77 RS uo dis 4 528 gin ow c Re MS 8 5 6 H i 4X la 812 584 e i ee wow T 1 s H H 2 2 H H E FRONT PART I d LA Fol u aX TS i Mir alle 2 3 or H m MEE m ud LL LLL TO GND lue H z H 4 4 4 1 480 i wa OP CLS SW d is 1 gis 1 Ey 7 E 2007 06 12 A B D E F G H J K I M N R 5 Copyright 2008 LG Electronics Inc All right reserved 3 19 3 20 LGE Internal Use Only Only for training and service purposes 3 PRINTED CIRCUIT DIAGRAM MAIN P C
5. 17 61 60 LCD LED Segment output 5 5 57 5 55 4 53 VDD3 59 8 3 510 8 2 S11 P8 1 S12 P8 0 S13 P7 3 S14 P7 2 S15 P7 1 S16 P7 0 S17 P6 3 S18 P6 2 S19 P6 1 S20 P6 0 001 VSS INTR3 SI2 P5 1 SDA SO2 P5 0 SCL SCK2 P4 3 INTR2 TX SCK1 RCK P4 2 RX SO1 RSD P4 1 INTR1 SI1 DCK P4 0 XVDD1 XO 18 19 20 21 22 23 AD1 P1 0 Key AD1 Key AD2 DOOR INNER AD2 P1 1 AD3 P1 2 INTR4 AD4 P1 3 PUH select LCD LED Slave INTR5 AD5 P2 0 USB POWER BUZZER AD6 P2 1 VREG MXO P3 0 SD SDDI USB GATE 3 12 MXI P3 1 VDD3 VSSP3 VCOI VDDP3 OSCin P3 2 RESET VDD1 VSS DVSS3 LO DVR CD POWER Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LEDS10 LEDS11 MUTE SYNC REC SD SDdet1 USB RESET USB REQ SD SDDO SD SDCK SD SDCS USB LRCK USB BCK USB AIN SDA SCL USB TX USB RX REMO UTC7312 BLOCK DIAGRAM G 5 4 gt 5 t Vcc e Rippli filter ALC input Ch2 Output 2 NFof CH2 Ripple Filter GND c 5 en 9 5 2 5r GE o6 2 885 5 28 d 55858 5 S UTC8227 TEST CIRCUIT SW Vcc2 O 1000uF Output 1 1000UF Output 2 Copyright 2008 LG Electronics Inc All right reserved 3 13 LGE Internal Use Only Only for training and service purposes LGE Internal Use Only Copyrig
6. 8V 0 250v 31 55122 1600 ol Option Table 5 Razo CD FM AM TA 9 2702 pu 8 7 H R ch i 4 lt gt 322 45 3888 828858 Qus 622 lt lt lt i BE 4 i H FT i RAS B 1 H 16 as i ie Ta 8 ERASE HEAD H Tor H 7 655 8 e 4m R242 za m 580 2X 65 z 5 E 7719771979 i 2 Mj 1 i 8 1 Ne Ix t 3 3 4 T POR th 4 NOS hs t3 A DECK PAR 1141111111 z HI omae z 0969900009 mss i mls 52 1 0969090909 t on ma 9 m Lus 14444445441 H1 ul me zs L H 25 6 m i 3 0 lso RY aK eT H 4 am a ft g c i H cos H cn TET uL TC94A77FG 1 T i 1 L201 t Tu 22 8 ER vss a E rm ur Rd m 5 9 FH rH M TEN H H mi E H mM cz R201 R232 m Lis 82 m Oe Pat om R PD mq 7 77
7. AY LCD501 LGE Internal Use Only CD B 3 18 12 3 2007 03 07 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes SCHEMATIC DIAGRAMS Option 5
8. BOARD DIAGRAM 0 9 el 8 oc r3 MANAULE N 0 000000 000000 8 UA O3 m o TT UL E VOSJ eos amp nq 408 099 LI 8555 lou 506711 9 1 12 2 6000 4 C G5 910 1 8 re V33bl n CF il ag 7 2 1 s o a 22 tM02 E 223 5 FJa 3 2 cn 555552 4 2 5 8 5 0 E hdi me 5 1118 82 U C23C2 Coma CD 2 SS 7 uaa e 1 GOA Only for training and service purposes Copyright 2008 LG Electronics Inc All right reserved 3 22 3 21 LGE Internal Use Only
9. P NO AFN62795896 LG NOVEMBER 2008 TWANVIN 39IAH3S 1991 XSSLIN Od71 TAGOW Website http biz lgservice com LG PORTABLE CD CASSETTE RECORDER CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL LPC M155X LPC12W CONTENTS O SECTION 1 GENERAL SERVICING PRECAUTIONS reece e ke ex E ESD PRECAUTIONS SPECIFICATION O SECTION 2 EXPLODED VIEWS O SECTION 3 ELECTRICAL SECTION TROUBLESHOOTING GUIDE INTERAL BLOCK DIAGRAM OF ICs WIRING DIAGRAM BLOCK DIAGRAM SCHEMATIC DIAGRAMS PRINTED CIRCUIT BOARD DIAGRAM O SECTION 4 REPLACEMENT PARTS Copyright 2008 LG Electronics Inc All right reserved 1 1 LGE Internal Use Only Only for training and service purposes SECTION 1 GENERAL 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 Repair notes 1 The pick up incorporates a strong magnet and so should never be brought close to magnetic materials 2 The pick up should always be handled correctly and carefully taking care to avoid external pressure and impact If it is subjected to strong pressure or impact the result may be an operational
10. ective Both voltage of R33 is Defective laser and or about 1 07 R33 1 0V LGE Internal Use Only 3 6 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes Whe laser light Yes 13 16 FC i No Does lenses move up and down 5 signal output at focus IC1 defective search ferminal Yes i N No Is signal output at CON3 deeds Yes Is pin95 FEI signal output No Yes Is IC1 pin94 SBAD signal output No Copyright 2008 LG Electronics Inc All right reserved 3 7 Only for training and service purposes Autuator short Connecter short Connecter short C1 defective Laser diode degraded Pick up defective LGE Internal Use Only 1 INTERAL BLOCK DIAGRAM OF ICs 24 32 BLOCK DIAGRAM WP VCC GND SCL SDA SERIAL CONTROL H V PUMP TIMING LOGIC pe DEVICE COMP DATA RECOVERY ADDRESS COMPARATOR DATA WORD Ag ADDR COUNTER SERIAL MUX Y DEC KIA278R33P1 BLOCK DIAGRAM VIN 1 Vo BANDGAP E REFERENCE ASO PROTECTION OUTPUT 0 CONTROL Cont1iol LGE Internal Use Only 3 8 Copyright 2008 LG Electronics Inc All right reserved ds Only for training and ser
11. efective Copyright 2008 LG Electronics Inc All right reserved 3 3 LGE Internal Use Only Only for training and service purposes CD PART Start Check power supply circuitry 4 1 4 7 2V 4 2pin 3 3V IC1 12 16 25 50 64 73 98 3 3V IC1 19 29 37 63 66pin 1 6V Power on No Check connector Check disc circuitry CON2 CON3 Does initial read work Yes Check laser circuitry Yes Check Focus circuitry Yes Check tracking servo circuitry Does it play Tracking servo check Is audio output gt PN702 1 4pin check supplied OK LGE Internal Use Only 3 4 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes IF INITIAL READING IS NOT CARRIED OUT WITH DISC Does disc motor Rotate Yes Is HF waveform output pin79 1111111111 Does laser light Yes Is waveform output at IC2 pin3 focus coil drive wareform Yes Is TE waveform output at IC1 pin96 TRACKING ERROR wareform Yes Does 1 pind voltage change when Limit S W ON OFF Yes Is IC1 pint voltage transmitted mu 2V 1 2V Yes SL SL Voltage ov 0 8V
12. ge ESD devices 6 Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparable conductive materials 7 Immediately before removing the protective material from the leads of a replacement ESD device touch the protective material to the chassis or circuit assembly into which the device will by installed CAUTION BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT AND OBSERVE ALL OTHER SAFETY PRECAUTIONS 8 Minimize bodily motions when handing unpackaged replacement ESD devices Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can gen erate static electricity sufficient to damage an ESD device CAUTION GRAPHIC SYMBOLS THE LIGHTNING FLASH WITH APROWHEAD SYMBOL WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED DAN GEROUS VOLTAGE THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved sque Only for training and service purposes
13. ht 2008 LG Electronics Inc All right reserved Only for training and service purposes L WIRING DIAGRAM 12 5 WIRING DIAGRAM FM ANT CONI CD MACHINE LPC 12MP3 RECTIFIER VER 01APR 06 2007 act 250V F901 2 94 0 5 9 TO DECK GND 0Av6 Co AC INPUT Copyright 2008 LG Electronics Inc All right reserved 3 15 3 16 Only for training and service purposes LGE Internal Use Only 4 BLOCK DIAGRAM FM ANT TUNER m POWER AMPLIFIER SPF B 2 SPEAKER MW_ANT o gt VR701 L CH REC OUT 50K gt lt Zz lt e C701 HEAD PHONE L108 BARANT TUNER Be 8227 8 SPEAKER Q701 702 a E R CH DECK MECH z lt gt 0901 ALC PBOUT SWITCH 5201 10201 IN 090170904 E Die 1 POWER TRANS ae IN5391 X 4 901 0903 a ERASE HEAD TAPE M cas L203 2 621 qe 55 cO i AC PWR CORD TC94A77FG CD VDD 405 MCU KIA278R33PI CD B t Ee t me i 1669 b d MOTOR DRIVER KEY DISPL
14. l 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 2 The pick up is composed of many optical components and other high precision components Care must be taken therefore to avoid repair or storage where the temperature of humidity is high where strong magnet ism is present or where there is excessive dust 2 Notes for repair 1 Before replacing a component part first disconnect the power supply lead wire from the unit 2 All equipment measuring instruments and tools must be grounded 3 The workbench should be covered with a conductive sheet and grounded When removing the laser pick up from its conductive bag do not place the pick up on the bag This is because there is the possibility of damage by static electricity 4 To prevent AC leakage the metal part of the soldering iron should be grounded 5 Workers should be grounded by an armband 1M Q 6 Care should be taken not to permit the laser pick up to come in contact with clothing in order to prevent sta tic electricity changes in the clothing to escape from the armband 7 The laser beam from the pick up should NEVER be directly facing the eyes or bare skin Armband Resistor 1 Mohm Resistor Conductive 1 Mohm Sheet Copyright 2008 LG Electronics Inc All right rese
15. malfunction and or damage to the printed circuit board 3 Each and every pick up is already individually adjusted to a high degree of precision and for that reason the adjustment point and installation screws should absolutely never be touched 4 Laser beams may damage the eyes Absolutely never permit laser beams to enter the eyes Also NEVER switch ON the power to the laser output part lens etc of the pick up if it is damaged AD NEVER look directly at the laser beam and don t let contact fingers or other exposed skin 5 Cleaning the lens surface If there is dust on the lens surface the dust should be cleaned away by using an air bush such as used for camera lens The lens is held by a delicate spring When cleaning the lens surface therefore a cotton swab should be used taking care not to distort this Pressure Conductive Sheet 6 Never attempt to disassemble the pick up Spring by excess pressure If the lens is extremely dirty apply isopropyl alcohol to the cotton swab Do not use any other liquid cleaners because they will damage the lens Take care not to use too much of this alcohol on the swab and do not allow the alcohol to get inside the pick up LGE Internal Use Only 1 2 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1 Preparations 1 Compact disc players incorporate a great many ICs as wel
16. ng and service purposes LGE Internal Use Only LGE Internal Use Only 2 3 2 4 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes PACKING ACCESSORY SECTION Instruction Ass y Power Cord Packing Packing Bag Box Copyright 2008 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes SECTION 3 ELECTRICAL SECTION TROUBLESHOOTING GUIDE MAIN PART 1 AUDIO OUT No power at IC701 pint 12 Is B applied to pn701 No No D901 904 Replace diode normal Y Yes Y Fuse change Transformer check Fuse open Yes Yes No 15 Q703 704 normal Replace Q703 704 SW 702 check 2 TUNER Tuner Abnormal Yes Does 4 5V come out at 101 pin6 Is Bt applied to Q102 No 0901 20901 check 0101 102 check Does signal come out at 13 14 101 check Yes SW 702 check Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 3 1 LGE Internal Use Only 3 CASSETTE DECK Deck ABNORMAL Is B
17. rved 1 3 LGE Internal Use Only Only for training and service purposes 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 1 Immediately before handling any semiconductor component or semiconductor equipped assembly drain off any electrostatic charge on your body by touching a known earth ground Alternatively obtain and wear a commercially available discharging wrist strap device which should be removed for potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ESD devices place the assembly on a conductive sur face such as aluminum foil to prevent electrostatic charge buildup or exposure of the assembly 3 Use only a grounded tip soldering iron to solder or unsolder ESD devices 4 Use only an anti static solder removal device Some solder removal devices not classified as anti static can generate electrical charges sufficient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to dama
18. t applied to LEAF Does B come out at Q901 collection CN701 ZD901 check CN202 check Does signal come out at 201 4 11 5 201 HEAD connector check Does output signal come out No from speaker CN202 check 4 Tape recode TAPE REC ABNORMAL Yes Does 201 pin4 11 signal come out CN202 pin3 4 check Does L203 depart Does B light at leaf switch Yes Does departure signal go into pn201 pint 3 R203 L204 L203 check HEAD connector check LGE Internal Use Only 3 2 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes e LCD CIRCUIT Is CD function selection proper Yes Dose display LCD then light Eee Supply power Supply circuitry defective in the power circuitry Yes Is reset circuit normal 3 3V No Supply circuitry defective VDD OV surrounding 3 3V circuit defective Reset OV i Yes Is pin27 28 normal osc No 39 e X1 defective 0 125usec Yes 59 60 61 62 output wareform normal Pattern defective Yes LCD light d
19. vice purposes 1669 BLOCK DIAGRAM LEVEL SHIFT Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 3 9 LGE Internal Use Only 2111 BLOCK DIAGRAM AM ANTENNA FM ANTENNA FM RF IN RF GND m AM LOW CUT 3 AM IF IN LGE Internal Use Only 1 H 3 10 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes TC94A77FG SYSTEM BLOCK DIAGRAM Optical Pickup LCD Display RPT ALBUM ALL SYNC MP3 WMA RANDOM PROG gt 4ch Driver with MUTE MM1469 Analog CD processor MP3 WMA decoder Audio Output audio DAC and system controlling MCU TC94A77FG 203 16 9MHz Panel keys Copyright 2008 LG Electronics Inc All right reserved 3 11 LGE Internal Use Only Only for training and service purposes PIN ASSIGNMENT RFRPI RFGO AGCI RFO EQSET VRO MDI LDO RVSS3 FNI2 12 TNI AVSS3 RFZI RFRP BAD FTE FEI TEI TEZI AVDD3 FOO TRO LGE Internal Use Only 4 5 6 7 8 9 10 TC94A77FG 203 11 HOLD 12 P11 3 COM1 P11 2 COM2 P11 1 COM3 P11 0 COM4 10 3 51 10 2 52 10 1 53 10 0 54 9 3 55 9 2 56 9 1 87 9 0 58 14 15 16
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