LG MCS902AW Service Manual Download Page 22

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3-4

MUTING TROUBLESHOOTING

(MUTE STATE)

MUTE

YES

EXPEND IC(IC305)

STATE CHECK

EXPEND IC(IC305)

FAULTY IS CHANGE

MICOM

IC302 57PIN HIGH

STATE CHECK

Q752(A102)

Emitter "HIGH"

Q701, Q751(D1302)

BASE "HIGH" CHECK

YES

Q752(A102) STATE CHECK

Q752(A102)

FAULTY IS CHANGE

EACH PART TR CHANGE

6. MUTING TROUBLESHOOTING (MUTE STATE)

EXPEND

IC(IC501/502) STATE

EXPEND IC OK

YES

D553/D551 (1SS133) CHANGE

D553/D551

(1SS133) CHECK

16PIN VDD

VOLTAGE CHECK

YES

PCB PATTERN CHECK

MICOM

(IC302) 39/44PIN CHECK

(CLK1/2)

3 "EXP-CLK" CHECK

YES

PCB PATTERN CHECK

MICOM (IC302)

72PIN CHECK

2 "EXP-DATA" CHECK

YES

EXPEND IC

FAULTY IS CHANGE

4PIN ~ 15PIN EACH

PORT STATE CHECK

7. EXPEND IC (IC501/502) STATE

Summary of Contents for MCS902AW

Page 1: ...ODEL MCV902 MCS902F MCS902S MCS902W MCS902AW CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL MCV902 MCS902F MCS902S MCS902W MCS902AW SERVICE MANUAL P NO AFN32840808 http biz lgservice com JANUARY 2007 ...

Page 2: ...OOTING 3 9 11 REC CHECK Q201 Q202 ON R276 R226 HIGH 3 10 12 DUBBING CHECK NORMAL OR REC HIGH 3 11 INTERNAL BLOCK DIAGRAM OF ICs 3 12 1 HA12237F 3 12 2 NJW1190 3 13 3 AF330W20FT 3 13 4 AF350W01FT 3 15 WIRING DIAGRAM 3 18 BLOCK DIAGRAM 3 20 SCHEMATIC DIAGRAMS 3 22 1 SMPS POWER SCHEMATIC DIAGRAM 3 22 2 SUB SMPS POWER SCHEMATIC DIAGRAM 3 24 3 AUDIO MAIN SCHEMATIC DIAGRAM 3 26 4 DECK SCHEMATIC DIAGRAM ...

Page 3: ...e 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 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 ca...

Page 4: ...ed 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 1MΩ 6 Care should be taken not to permit the laser pick up to come in contact with clothing in order to preve...

Page 5: ...harges sufficient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage 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 comparabl...

Page 6: ...VOLUME CONTROL KNOB EQ button SURROUND button USER EQ button MP3 OPT MP3 OPTIMIZER button MULTI JOG MANUAL TUNING CD SKIP CLOCK ADJUST 6 PHONES HEADPHONE JACK ø6 3mm 7 PUSH EJECT position TAPE 1 8 GAME LINK connector VIDEO IN AUDIO L R USB connector 9 CD DOOR 10 CLOCK button TIMER button ST MONO NOR DUBB button CD SYNC HI DUBB button 11 MIC1 MIC2 MIC JACK ø6 3 mm OPTIONAL MIC VOL MIC VOLUME KNOB O...

Page 7: ...1 6 REMOTE CONTROL ...

Page 8: ...3000 3 MTT 111 NORMAL SPEED Wow flutter 0 25 MTT 111 JIS WTD F F REW Time 120sec C 60 TAPE Frequency response 125 8000Hz Signal to noise ratio 43dB Channel separation 50dB P B 45dB R P Erase ratio 55dB MTT 5511 Speaker name Front speaker L R Surround speaker L R MCS902F MCS502F MCS902S Type Bass reflex 2 way 2 speaker Bass reflex 2 way 2 speaker Impedance 6Ω 24Ω Frequency response 60 20000Hz 70 20...

Page 9: ...1 8 MEMO ...

Page 10: ...47 A52 A51 453 456 450 450 450 291 270 303 452 450 450 450 450 279 280 454 454 305 455 278 285 454 457 FAN 450 CABLE2 CABLE1 CD MAIN FRONT SMPS SUB SVC purchase order caution MAIN board is array coming USB board Purchase order board separately supply incomprehensible Supply is possible in Location No A46 state in exploded views CABLE5 CABLE6 2 1 2 2 SECTION 2 EXPLODED VIEWS CABINET EXPLODED VIEW ...

Page 11: ...023 015 022 019 037 021 020 018 017 006 A01 008 007 001 002 003 009 009 011 013 A02 025 2 3 2 4 TAPE DECK MECHANISM EXPLODED VIEW 1 TAPE DECK MECHANISM A R A S A R DECK ...

Page 12: ...2 5 2 6 016 018 007 008 015 019 021 020 017 A03 009 003 011 013 009 022 025 023 2 TAPE DECK MECHANISM A R A S A S DECK ...

Page 13: ...7 2 8 416 151 159 165 164 417 166 417 167 416 177 175 172 170 419 417 418 418 190 189 188 A30 A32 A26 181 187 186 184 421 421 185 156 155 153 173 168 163 162 441 440 422 A35 417 CD MECHANISM EXPLODED VIEW ...

Page 14: ... 9 2 10 A80BL A80L A80A 858 857 856 855 854 851 850 852 853 860 859 857 862 WIRE81 861 A80BR A80R A80A 858 857 856 855 854 851 850 852 853 860 859 857 862 WIRE80 861 SPEAKER EXPLODED VIEW 1 MODEL MCS902F ...

Page 15: ...2 11 2 12 A60BR A60R A60A WIRE60 659 658 660 656 657 655 654 651 650 652 653 661 662 A60BL A60L A60A WIRE61 659 658 660 656 657 655 654 651 650 652 653 661 662 2 MODEL MCS902S ...

Page 16: ...2 13 2 14 A90A A90B WIRE92 959 958 957 960 951 952 950 A91 961 962 958 3 MODEL MCS902W ...

Page 17: ...2 15 2 16 A90AW A90BW 950A WIRE91 WIRE90 953 954 955 956 963 958 959 957 951 952 A90 961 962 958 960 4 MODEL MCS902AW ...

Page 18: ...2 17 PACKING ACCESSORY VIEW ...

Page 19: ...CE FUSE CHECK BD901 TO PIN IMPEDANCE LOW IMPEDANCE CHANGE ASSY CHECK C986 VOLT 5 6V CHECK LINE SHORT CHECK CONNECTION CN902 CN903 NO SOUND INSERT POWER CORD AFTER 10 SECONDS CHECK THE AMP MODULE SHORT CHECK C961 C951 VOLT OVER 40V CHANGE FR971 972 974 975 CHECK C958 C968 VOLT OVER 9V PORTECTION CHECK NO SOUND LISTS DISPLAY INSERT POWER CORD AFTER 1 MINUTE ...

Page 20: ...304 6PIN 5 1V CHECK MAIN PCB PATTERN CUTTING AND SHORT CHECK IC304 KIA7042 CHANGE µ COM IC302 1PIN 4 4V CHECK NO YES FRONT PN304 35 PIN 5 1V CHECK YES YES FRONT IC304 RESET IC STATE CHECK IC304 INPUT VOLTAGE 5V OVER STATE CHECK AND OUTPUT VOLTAGE 4V OVER STATE CHECK NO 3 VKK CHECK VKK CHECK YES YES CN710 10PIN DC 32V CHECK SMPS TROUBLESHOOTING CONSULT NO IC301 50PIN VOLTAGE CHECK ...

Page 21: ...2 CHANGE MICOM IC302 CHANGE IC302 CHANGE RESET IC302 10PIN CHECK LOW HIGH Q302 Q303 STATE CHECK NO NO YES YES YES YES P SENS CHECK NO P SENS TROUBLESHOOTING CONSULT X301 X302 CHANGE TR Q302 Q303 CHANGE IC302 VDD 19 20 59 PIN VOLTAGE CHECK PN304 34PIN 5 6V MI CHECK NO NO NO YES X301 9 8304MHz X302 32 768KHz VIBRATION SIGNAL CHECK NO YES YES MAIN CN710 6PIN CHECK SMPS TROUBLESHOOTI NG CONSULT ...

Page 22: ... FAULTY IS CHANGE EACH PART TR CHANGE 6 MUTING TROUBLESHOOTING MUTE STATE EXPEND IC IC501 502 STATE EXPEND IC OK YES YES D553 D551 1SS133 CHANGE D553 D551 1SS133 CHECK 16PIN VDD VOLTAGE CHECK NO NO YES YES YES PCB PATTERN CHECK MICOM IC302 39 44PIN CHECK CLK1 2 3 EXP CLK CHECK NO NO YES YES YES PCB PATTERN CHECK MICOM IC302 72PIN CHECK 2 EXP DATA CHECK NO NO YES YES EXPEND IC FAULTY IS CHANGE 4PIN...

Page 23: ...HANGE YES IC502 4PIN REC SW LOW STATE REC IC502 4PIN REC SW HIGH CHECK Q212 C HIGH CHECK NO YES Q213 C LOW CHECK YES IC502 13PIN REC BAIS HIGH CHECK YES L203 4 7mH COIL VIBRATION CHECK YES IC601 7 32 INPUT REC SIGNAL CHECK YES IC601 3 36PIN INPUT SIGNAL CHECK DECK HEAD WIRE CONNECTION STATE CHECK NO IC601 NJW1190 TROUBLESHOOTING CONSULT 8 FUNCTION MODE HAS NO SOUND NJW1190 IC601 YES IC601 17 22PIN...

Page 24: ...G CONSULT YES NO IC601 17 22PIN OUTPUT SIGNAL CHECK AUX OUTPUT JK601 SIGNAL INPUT CHECK CD YES YES IC601 NJW1190 TROUBLESHOOTING CONSULT YES NO IC601 17 22PIN OUTPUT SIGNAL CHECK MAIN PCB PATTERN CHECK YES NO IC601 4 35PIN SIGNAL INPUT CHECK CD OUTPUT PN709 6 8PIN SIGNAL CHECK and CD TROUBLESHOOTING CONSULT ...

Page 25: ...N CHECK YES IC601 17 22PIN OUTPUT SIGNAL CHECK NO MIC IC601 NJW1190 TROUBLESHOOTING CONSULT MIC YES YES JK401 JK402 CHECK JK401 JK402 4PIN OUTPUT CHECK IC302 31 34PIN MIC SENSE CHECK IC402 8PIN SIGNAL INPUT CHECK PN304 1PIN MIC SIGNAL CHECK NO NO NO YES YES YES IC402 6PIN 9V CHECK YES YES YES IC402 7PIN SIGNAL OUTPUT CHECK IC402 2PIN SIGNAL INPUT check IC402 3PIN SIGNAL OUTPUT CHECK YES YES IC601 ...

Page 26: ...NG NO IC601 19 20 SDA SCA PULSE WAVE CHECK VOL UP DOWN TURN CHECK IC601 CHANGE NO FUNCTION INPUT PORT SIGNAL CHECK NJW1190 TROUBLESHOOTING YES SMPS VOLTAGE CHECK CONSULT YES NO IC601 24PIN VOLTAGE INPUT CHECK IC601 17 22PIN WAVE OUTPUT CHECK YES IC601 OK 9 IC601 NJW1190 TROUBLUSHOOTING ...

Page 27: ...ECK PROTECTION HIGH SMPS VOLTAGE AND AMP ON OFF STATE CHECK YES NO PN702 3PIN PROTECTION CHECK HIGH LOW SMPS TROUBLESHOOTING CONSULT YES NO IC701 3 20 5 18 EACH 65V 65V CHECK SMPS TROUBLESHOOTING CONSULT YES NO IC701 9 14 9V CHECK IC701 11PIN AMP ON OFF HIGH CHECK IC701 6 17 OUTPUT SIGNAL CHECK IC701 12PIN PROTECTION LOW CHECK IC701 10 13 INPUT SIGNAL CHECK YES OK 10 AMP MODULE TROUBLESHOOTING ...

Page 28: ...E 0 6V OVER CHECK L203 2 3PIN OCSILLATION CHECK NO NO NO IC201 7 24PIN INPUT CHECK NO YES Q204 CHANGE Q204 COLLECTOR LOW NO YES L203 CHANGE Q203 CHANGE NO YES YES OK IC502 4PIN STATE CHECK YES Q213 212 STATE CHECK INPUT LINE CHECK IC201 10 21PIN OUTPUT CHECK NO IF NO SIGNAL CHANGE THE IC IC201 IC601 EACH INPUT TUNER 2 37 TAPE 3 36 CD 4 35 AUX 5 34PIN SIGNAL INPUT CHECK NO REC INPUT CHECK ...

Page 29: ... CHECK IC201 10 21PIN OUTPUT CHECK YES YES REC INPUT CHECK NO IC601 EACH INPUT TUNER 2 37 TAPE 3 36 CD 4 35 AUX 5 34PIN SIGNAL INPUT CHECK YES INPUT LINE CHECK NO IC201 7 24PIN INPUT CHECK 12 DUBBING CHECK NORMAL OR REC HIGH ...

Page 30: ...3 12 INTERNAL BLOCK DIAGRAM OF ICs 1 HA12237F ...

Page 31: ...3 13 2 NJW1190 3 AF330W20FT 3 1 PIN CONFIGURATION ...

Page 32: ...3 14 3 2 BLOCK DIAGRAM 3 3 PIN DESCRIPTION ...

Page 33: ...3 15 4 AF350W01FT 4 1 PIN CONFIGURATION 4 2 BLOCK DIAGRAM ...

Page 34: ...3 16 4 3 PIN DESCRIPTION ...

Page 35: ...3 17 MEMO ...

Page 36: ...3 18 3 19 WIRING DIAGRAM ...

Page 37: ...3 20 3 21 BLOCK DIAGRAM ...

Page 38: ...RIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED THIS WAY IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS PRINTED 1 Shaded parts are critical for safety Replace only with specified part number 2 Volta...

Page 39: ...ONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED THIS WAY IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS PRINTED IMPORTANT SAFETY ...

Page 40: ...3 26 3 27 3 AUDIO MAIN SCHEMATIC DIAGRAM ...

Page 41: ...3 28 3 29 4 DECK SCHEMATIC DIAGRAM ...

Page 42: ...3 30 3 31 5 USB AUX2 HEADPHONE AMP SCHEMATIC DIAGRAM ...

Page 43: ...3 32 3 33 6 I O JACK SCHEMATIC DIAGRAM ...

Page 44: ...3 34 3 35 7 AMP SCHEMATIC DIAGRAM ...

Page 45: ...3 36 3 37 8 WOOFER AMP SCHEMATIC DIAGRAM ...

Page 46: ...3 38 3 39 9 FRONT SCHEMATIC DIAGRAM ...

Page 47: ...3 40 3 41 1 MAIN P C BOARD PRINTED CIRCUIT DIAGRAMS ...

Page 48: ...3 42 3 43 2 SMPS POWER P C BOARD 3 SUB SMPS POWER P C BOARD ...

Page 49: ...3 44 3 45 4 FRONT P C BOARD ...

Page 50: ...3 46 3 47 5 AMP P C BOARD TOP VIEW BOTTOM VIEW ...

Page 51: ...3 48 3 49 6 WOOFER AMP P C BOARD MEMO ...

Page 52: ... NO READING DISPLAY CHECK CONNECTOR CHECK PN802 PN803 PN804 CN806 PN814 NO CHECK MICOM INTERFACE CIRCUIT PN805 CE BTL MUTE CD IN CD UT CLK WRQ FSEQ YES NO READING OK CHECK CONNECTOR CHECK PN801 PN802 NO YES IF PLAY AUDIO OUTPUT CHECK CHECK CN806 AUDIO SIGNAN CHECK PIN6 L_Ch IC801 PIN76 LCHO PIN8 R_Ch IC801 PIN78 RCHO NO CHECK PICKUP MOVEMENT NO CHECK AM5810FP IC802 NO CHECK LC78692 IC801 OK SECTIO...

Page 53: ...N806 PIN1 12V PIN2 6 3V PN805 PIN8 5V_AD DEFECTIVE MAIN POEWR SUPPLY NO YES CHECK VOLTAGE CHANGE LO LO OF IC803 PN805 PIN23 OPEN PIN22 CLOSE DEFECTIVE IC803 NO YES CHECK VOLTAGE CHANGE OF OPEN CLOSE IC803 INPUT VOLTAGE PIN6 12V PIN7 6 3V PN805 PIN2 BTL_MUTE 23 OPEN 22 CLOSE DEFECTIVE MICOM NO DEFECTIVE MECHANISM ...

Page 54: ...R OR MAIN POWER SUPPLAY DEFECTIVE IC804 NO YES CHECK MICOM INTERFACE CIRCUIT PN805 PN805 PIN1 3 4 15 19 26 SIGNAL CHECK 1 CE 3 DI 4 CLK 15 D0 19 RST 18 FSEQ 26 WRQ PIN3 DI From DSP to Micom PIN15 DO From Micom to DSP CHECK THE WAVE FORM 1 DEFECTIVE MICOM OR CONNECTOR NO DEFECTIVE IC801 CHECK VOLTAGE THE PIN 2 OF IC804 IC804 PIN2 3 3V NO YES DEFECTIVE MICOM OR CONNECTOR CHECK RESET SIGNAL OF PN805 ...

Page 55: ...NO DISC DISPLAY DOES LENSE MOVE UP DOWN YES A YES DEFECTIVE PICKUP OR IC802 OR IC801 NO NO CHECK PN801 PIN 13 16 FA FA B DEFECTIVE PICKUP OR IC801 DOES LASER LIGHT NO NO CHECK PN801 PIN10 LD YES C DEFECTIVE PICKUP OR IC802 OR IC801 DOES SPINDLE ROTATE NO NO CHECK PN802 PIN5 6 SP SP YES D DEFECTIVE PICKUP OR IC802 OR IC801 NO NO CHECK PN801 PIN14 15 TA TA E ...

Page 56: ...ISC DISPLAY YES NO A DEFECTIVE IC802 CHECK PN802 CONNECTOR LINE NO DEFECTIVE PN802 CONNECTOR YES DEFECTIVE PICKUP FOCUS ACTUATOR DEFECTIVE IC801 DOES FA WAVEFORM APPEAR AT IC802 PIN16 AND PN801 PIN13 WAVEFORM 3 FOCUS COIL DRIVE WAVE DOES FAIN WAVEFORM APPEAR AT IC802 PIN25 WAVEFORM 3 FOCUS DRIVE WAVE NO NO 1 5 READING OK CHECK B NO DISC DISPLAY YES NO B DEFECTIVE IC802 CHECK PN801 CONNECTO LINE NO...

Page 57: ... CHECK IS 3 3V APPLIED TO PIN30 36 39 41 61 68 75 OF IC801 RF IC SUPPLY VOLTAGE CHECK NO NO 1 6 READING OK CHECK C NO DISC DISPLAY YES YES DEFECTIVE IC801 IS 2 3V PIN18 LDO OF IC801 LASER CONTROL VOLTAGE CHECK NO YES C DEFECTIVE Q801 OR D801 CHECK PN801 CONNECTOR LINE NO DEFECTIVE PN801 CONNECTOR YES ...

Page 58: ...PEAR AT IC802 PIN11 AND PN802 PIN 5 WAVEFORM 4 SPINDLE MOTOR DRIVE WAVE DOES SPIN WAVEFORM APPEAR AT IC802 PIN6 WAVEFORM 4 SPINDLE DRIVE WAVE NO NO 1 7 READING OK CHECK D NO DISC DISPLAY YES YES D DEFECTIVE IC802 CHECK PN802 CONNECTOR LINE NO DEFECTIVE PN802 CONNECTOR YES ...

Page 59: ...14 WAVEFORM 5 TRACKING COIL DRIVEWAVE DOES TAIN WAVEFORM APPEAR AT IC802 PIN22 WAVEFORM 5 TRACKING DRIVE WAVE NO NO 1 8 READING OK CHECK E NO DISC DISPLAY YES YES E DEFECTIVE IC802 CHECK PN802 CONNECTOR LINE NO DEFECTIVE PN802 CONNECTOR YES DOES ARF SIGNAL APPEAR IC801 PIN 2 WAVEFORM 6 NO DEFECTIVE PICKUP OR IC801 YES NO DEFECTIVE PICKUP OR IC801 ...

Page 60: ...5 PIN13 RX IC805 PIN49 TXD PIN14 TX IC805 PIN33 RXD NO NO CHECK PN810 PIN2 D 3 D CHECK OTI6888 IC805 CONNECTOR CHECK CN806 OK YES CHECKING OR USB DISPLAY CHECK NO YES CHECK PN810 1PIN 5V READING OK CHECK NO CHECK SIGNAL STCK STREQ STDATA STCK IC805 PIN52 IC801 PIN55 STREQ IC805 PIN53 IC801 PIN54 STDATA IC805 PIN54 IC801 PIN56 IF PLAY AUDIO OUTPUT CHECK NO NO ...

Page 61: ... PIN15 DO IC801 PIN45 DATA IN 1 MICOM INTERFACE WAVEFORM PN805 PIN26 19 3 15 during normal play PIN26 WRQ PIN19 RESET PIN3 DI IC801 PIN46 DATA OUT PIN15 DO IC801 PIN45 DATA IN 1 MICOM INTERFACE WAVEFORM PN805 PIN4 1 18 during power on PIN4 CL PIN1 CE PIN18 FSEQ 1 MICOM INTERFACE WAVEFORM PN805 PIN4 1 18 during normal play PIN4 CL PIN1 CE PIN18 FSEQ ...

Page 62: ...WAVEFORM IC802 PIN5 13 during normal play PIN5 SLIN PIN13 SL 3 FOCUS DRIVE AND MOTOR WAVEFORM IC802 PIN25 IC802 PIN16 When focus search failed or there is no disc on tray PIN25 FAO PIN16 FA 3 FOCUS DRIVE AND MOTOR WAVEFORM IC802 PIN25 IC802 PIN16 There is disc on tray and focus search success PIN25 FAO PIN16 FA ...

Page 63: ...IN6 11 when TOC reading PIN6 SPIN PIN11 SP 5 TRACK DRIVE AND MOTOR WAVEFORM IC802 PIN22 IC802 PIN17 during normal play 6 RF FOCUS AND TRACKING ERROR WAVEFORM IC801 PIN2 10 16 during normal play PIN2 RFOUT PIN 16 TE PIN10 RFMON FE PIN22 TAO PIN17 TA ...

Page 64: ...4 13 4 14 SCHEMATIC DIAGRAMS 1 CD SCHEMATIC DIAGRAM ...

Page 65: ...4 15 4 16 2 USB SCHEMATIC DIAGRAM ...

Page 66: ...CD P C BOARD TOP VIEW BOTTOM VIEW PRINTED CIRCUIT DIAGRAM 4 17 4 18 ...

Page 67: ...4 19 4 20 MEMO MEMO ...

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