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LG RZ-20LA70 Service Manual Download Page 7

- 7 -

1. Application Object

This instruction is for the application to the LCD TV.

2. Notes

(1) This set uses an adapter, so connect the adapter and the

set correctly before adjustment.   

(2) The adjustment must be performed under the correct

sequence.

(3) The adjustment must be performed in the circumstance of

25

!

5

c

C of temperature and 65

!

10% of relative humidity if

there is no specific designation.

(4) The set must be operated for 15 minutes preliminarily

before adjustment if there is no specific designation.

[

‘Heat Run’ must be performed with the full white signal or TV

noise signal in the internal part of the set.

[ 

The time for ‘Heat Run’ can be changed owing to production
plan. 

[ 

Line Test condition (TV): standard color signal 65

!

1dBuV

ADJUSTMENT INSTRUCTION

Summary of Contents for RZ-20LA70

Page 1: ...TION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS ML 024D MODEL RZ 20LA70 website http biz LGservice com e mail http www LGEservice com techsup html Oct 2003 Printed in Korea P NO 3828VD0168C ...

Page 2: ...ENTS 2 PRODUCT SAFETY 3 DESCRIPTION OF CONTROLS 4 ADJUSTMENT INSTRUCTION 7 TROUBLE SHOOTING 13 PRINTED CIRCUIT BOARD 14 BLOCK DIAGRAM 17 EXPLODED VIEW 18 EXPLODED VIEW PARTS LIST 19 REPLACEMENT PARTS LIST 20 SVC Sheet ...

Page 3: ... on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna terminals phone jacks etc If the exposed metallic part has a return path to the chassis the measured resistance should be between 1MΩ and 5 2MΩ When the exposed metal has no return path to the chassis the reading must be infinite Any o...

Page 4: ... programme table 4 Q VIEW returns to the previously viewed programme selects a favourite programme 5 D E Programme Up Down selects a programme or a menu item switches the set on from standby F G Volume Up Down adjusts the volume adjusts menu settings OK accepts your selection or displays the current mode 6 NUMBER BUTTONS switches the set on from standby or directly select a number 7 SSM Sound Stat...

Page 5: ...our preferred picture setting 13 TELETEXT BUTTONS option These buttons are used for teletext For further details see the Teletext section No function COLOURED BUTTONS These buttons are used for teletext only TELETEXT models or programme edit POWER MUTE TV AV I II LIST PR PR VOL OK 1 2 3 4 5 6 7 8 9 SSM PSM 0 VOL Q VIEW MENU SLEEP TEXT UPDATE TIME SIZE MIX HOLD REVEAL INDEX MODE i M 1 9 10 11 12 13...

Page 6: ...tches the set on from standby 7 POWER STANDBY INDICATOR O illuminates red in standby mode illuminates green when the set is switched on 8 REMOTE CONTROL SENSOR 9 HEADPHONE SOCKET Connect the headphone plug to this socket 10 AUDIO VIDEO IN SOCKETS AV2 Connect the audio video out sockets of exter nal equipment to these sockets S VIDEO AUDIO IN SOCKETS SAV Connect the video out socket of an S VIDEO V...

Page 7: ...rmed in the circumstance of 25 5cC of temperature and 65 10 of relative humidity if there is no specific designation 4 The set must be operated for 15 minutes preliminarily before adjustment if there is no specific designation Heat Run must be performed with the full white signal or TV noise signal in the internal part of the set The time for Heat Run can be changed owing to production plan Line T...

Page 8: ...RT 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 OPTION Data 200PR TEXT I II SV TOP A2 ST SYS 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...

Page 9: ... 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 OPTION Data 200PR TEXT I II SV TOP A2 ST SYS 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...

Page 10: ... 0 1 SCART 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 OPTION Data 200PR TEXT I II SV TOP A2 ST SYS 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 01 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

Page 11: ...0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 OPTION Data ACMS VOL BBACK LANG 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...

Page 12: ...4 25 26 27 28 29 30 31 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 ...

Page 13: ... Check signal of R G B output 3 Re soldering 1 No screen Input error of inverter connector 1 Bend the pin legs of P802B connector recheck them 2 Check and repair IC805 SI4925 P1 and Pin 50 connector 1 Check and fix P1 connector being slipped out Cracked components and 1 Check and repair tuner board and main board soldering at tuner board 2 Solder Q403 2 Dark screen 1 Defective LCD lamp 1 Replace t...

Page 14: ... 14 PRINTED CIRCUIT BOARD MAIN TOP ...

Page 15: ... 15 MAIN BOTTOM ...

Page 16: ... 16 POWER CONTROL ...

Page 17: ...BLOCK DIAGRAM 17 ...

Page 18: ... 18 EXPLODED VIEW 400 310 120 560 530 250 340 360 380 370 330 350 210 300 112 520 230 430 ...

Page 19: ... HINGE ASSY NON 20LA70 340 4810V00767A BRACKET STAND 20LA60 ML012B NON HINGE FRONT 350 4810V00768A BRACKET STAND 20LA60 ML012B NON HINGE COVER 360 4810V00924A BRACKET STAND RZ 20LA70 NON ABS 370 4950V00193A METAL STAND SPCC CR BASE 20LA70 380 4950V00194A METAL STAND SPCC CR SUPPORTER LA70 400 3809V00407A BACK COVER ASSEMBLY RZ 20LA70 NON STUH LGEIS 3809V00407C BACK COVER ASSEMBLY RZ 20LA70 1SCART ...

Page 20: ...01 IC702 PC1 PC2 Q101 Q102 IC1102 IC1103 IC1104 IC1105 IC1223 IC1224 IC2 Q1 Q100 Q1101 Q1101 Q1102 Q1103 Q1200 Q200 Q202 Q353 Q402 Q403 0ISM555000B 0IAL241610B 0IFA752700A 0IMCRO2001A 0IMCRRH005A 0IMCRRH005A 0IMCRRH005A 0IMCRMZ001A 0IMCRMZ001A 0IMCRFA010A 0ISO204000A 0IMCRTW001B 0ICTMMO005A 0IMCRMN011D 0IKE704200J 0IMCRFA009A 0IMCRTI022D 0IPMGSK012A 0IMCRFA007A 0ILI817000G 0ILI817000G 0IFA270000A ...

Page 21: ...2UF STD 16V M FL TP5 0 1000UF STD 50V M FL TP5 100UF STD 16V M FL TP5 LOCA NO PART NO DESCRIPTION C351 C353 C354 C356 C357 C362 C364 C380 C381 C383 C403 C404 C408 C410 C412 C413 C499 C501 C523 C526 C541 C581 C613 C614 C616 C617 C617 C620 C621 C624 C625 C629 C633 C643 C700 C701 C703 C704 C706 C707 C708 C709 C710 C717 C718 C719 C720 C725 0CE227DF618 0CE475DK618 0CE476DF618 0CE106DF618 0CE106DF618 0C...

Page 22: ...L505 L506 L507 L518 R702 R703 R704 R705 R706 R706 R711 R712 R714 R715 R727 R736 SW1101 SW1102 SW1103 SW1104 SW1105 SW1106 SW1107 SW1108 L101 L1101 L1101 L119 L1200 L1205 L1206 L200 L200 L201 L201 L202 L202 L204 L205 L206 L207 L208 L209 0RRZVTA001A 0RRZVTA001A 0RRZVTA001A 0RRZVTA001A 0RRZVTA001A 0RKZVTA001C 0RKZVTA001K 0RS5602K619 0RS5602K619 0RS5602K619 0RS1203K607 0RS5602K619 0RS5602K619 0RS5602K...

Page 23: ...MM R TP HH 1M3216 501 3216MM R TP HH 1M3216 501 3216MM R TP HH 1M3216 501 3216MM R TP OR 14 7 7 5H SMC BK 6 0 11 0MH MLB 201209 1000L N2 MLB 201209 1000L N2 MLB 201209 1000L N2 MLB 201209 1000L N2 MLB 201209 1000L N2 MLB 201209 1000L N2 MLB 201209 1000L N2 MLB 201209 1000L N2 MLB 201209 1000L N2 HB 1S2012 080JT 2012MM CHIP BEAD FERRITE 1UH TAPING RESONATOR CRYSTAL HC49U 6 000MHZ RESONATOR CRYSTAL ...

Page 24: ...P NO 3854VA0135A S1 2003 10 13 ...

Page 25: ...SVC SHEET 3854V A0135A S1 ...

Page 26: ...G THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS ML 041B MODEL RZ 20LA70 RZ 20LA70 Rev A website http biz LGservice com e mail http www LGEservice com techsup html ID LABEL Model No Same looking with new chassis Issue Date 2004 06 ...

Page 27: ...TS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 10 TROUBLE SHOOTING 12 BLOCK DIAGRAM 17 WIRING DIAGRAM 19 EXPLODED VIEW 20 EXPLODED VIEW PARTS LIST 21 REPLACEMENT PARTS LIST 22 SVC SHEET ...

Page 28: ...t such as antennas terminals etc to be sure the set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in...

Page 29: ...ely obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge buildup or exposure of the assembly 3 Use only a grounde...

Page 30: ...t shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replaced component and adjacent components and the circuit board...

Page 31: ...ical Interface Color Depth Size mm Surface Treatment Operating Mode Back light Unit R T Typ Maker Type ActiveDisplay Area Pixel Pitch mm Electrical Interface Color Depth Size mm Surface Treatment Operating Mode Back light Unit R T Typ LPL TFT Color LCD Module 20 1 inches 380 16mm diagonal Aspect 4 3 0 6375mm H x0 6375mm V xRGB TTL 8BIT 16 777 216 colors 450 H x 348 7 V x20 D Glare Hard Coating 3H ...

Page 32: ...1 1 NO YES BG DK BG I LL BG DK BG I LL X X X X X X X X X X X X X Item Specification Remark No Top option PAL NTSC Rear Rear Rear option NT Rear option EU Rear 5 Optical Character Item Remark Specification Viewing Angle CR 10 Luminance Contrast Ratio CIE Color Coordinates Typical MAX MIN ALL white All black R L U D Luminance cd Variation LPL 85 85 85 85 400 1 3 400 0 289 0 335 0 692 0 335 0 289 0 5...

Page 33: ...ync 15 SCL 1 Contrast Brightness 2 H Position V Position 3 Tracking Clock Phase 4 Auto Configure RESET 1 Y 3 Pb 5 Pr 1 Y GND 2 Pb 5 Pr 7 LINE1 Ready 9 Line2 11 Line3 13 Line3 ready 2 Green 4 ID2 GND 6 RED GND 8 Blue GND 10 D GND 12 SDA 14 V Sync Shell GND 2 Y GND 4 Pb GND 6 Pr GND 8 LINE1 10 Line2 Ready 12 SWITCH GND 14 SWITCH Remark 10 Digital GND Middle east NTSC Area JAPAN Only Video Active Off...

Page 34: ...on Audio Input Dynamic Range Video Output Level Video Output Frequency Response Video Output S N Audio Output Level Audio Output Frequency Response Audio Output S N Audio Output Distortion Video Input Level R G B Video Input Level Component Y PB PR RGB Input Resolution Vertical RGB Input Resolution Horizontal RGB Input Horizontal Frequency RGB Input Frame Rate 0 85 0 4 0 1 40 2 0 85 3 8 40 0 4 0 1...

Page 35: ...anually 2 2 Auto Gain Offset adjustment 2 2 1 RF Mode adjustment 2 2 1 1 Adjustment preparation Conduct Heat Run at the RF fog signals for more than 30 minutes 2 2 1 2 Auto Gain Offset adjustment Press IN START Key to convert to the adjustment mode using the adjustment SVC remote controller and press VOL Key at the Auto Gain menu Once the adjustment is completed press the Enter Key to save and fin...

Page 36: ...the front AV To move channel up down or to select a function displayed on the screen To adjust the volume or accurately control a specific function To set a specific function or complete setting To move the channel down in the PIP screen To use as a red key in the teletext mode To move the channel in the PIP screen To use as a green key in the teletext mode To switch between the main and sub scree...

Page 37: ... short of main B D or Change Lips Change IC1107 IC1104 Change LED Assy Check 15V or 5V of Lips Check Output of IC1107 IC104 Check LED Assy Check P1100 P210 Connector Fail Fail Change Q1100 Check Output of Q1100 Fail Pass Fail Pass Pass Pass A Process ...

Page 38: ...eck inverter Connector or inverter Check input source cable and jack Repeat A PROCESS Fail Change L900 L901 L902 L903 Fail Change IC901 Fail Change inverter connector or inverter Fail Change panel link cable or module Fail Change module Fail Check panel link Cable or module Pass Pass Pass Pass B Process ...

Page 39: ... Check the input output of IC1 Check the input output of IC901 Check input source cable and jack Fail Re soldering or Change the defect part Check X11 Fail Re soldering or Change the defect part Check X900 Fail Pass Pass Pass Check the input output of IC800 IC851 Re soldering or Change the defect part Fail Pass ...

Page 40: ...e input output of IC1 Check the input output of IC800 IC851 Check input source cable and jack Fail Fail Fail Fail Re soldering or Change the defect part Chek X11 Fail Re soldering or Change the defect part Check 5V 33V of TU1000 Re soldering or Change the defect part Pass Pass Pass Check the input output of IC901 Fail Re soldering or Change the defect part Check X900 Pass Pass ...

Page 41: ... Check the input source Fail Pass Re soldering or Change the defect part Check X11 Check the input output of IC1 Fail Pass Re soldering or Change the defect part Check the input output of IC100 IC101 Fail Pass Change speaker Check the speaker Fail Pass ...

Page 42: ...851 LA7222 IC2 TC90A65F IC500 14066 IC202 D SUB AT24C16 IC4 DIGITAL SIGNAL SOUND INPUT IF INPUT ANALOG SIGNAL SOUND OUTPUT ML 041B Block Diagram POWER IF PC SIDE_AV L R SIDE_L R PC L R L R AUDIO S A W Z1000 SCART V L R S VHS H P V SCART R G B SIDE V Y P b P r RGB OUT TTL 1 OUT TTL 2 OUT LVDS 1 O UT PC RGB COMPONENT ...

Page 43: ...nt to the LCD module as a TTL output VCTi is the main microprocessor that handles video signal processing and sound signal processing It also manages the RF signals received from the tuner The scaler can control timing to fit into the LCD panel and can also control the size and position of the input signal 2 Power Supply Unit The power supply unit provides 15V and 5V DC power to the mainboard The ...

Page 44: ... 220MM 1 20P LVDS 200MM 2 41P TTL 3 50P TTL 145MM 4P_2 5MM SHIELD RECEPTERCLE GND 2PIN 4PIN 500MM 750MM 1 6 7 5 2 3 4 8 9 P904 P902 P901 WIRING DIAGRAM No Part No 1 2 3 4 5 6 7 8 9 Wiring Part List 6631T25019Y 6631T11017P CMO 6631T11017Q AUO 6631T11021A 6631T11012R 6631T20028G 6631T20029X 6631T25021A 6620K00007C or 6620K00007A 6631T11017R ...

Page 45: ...EXPLODED VIEW 1 2 3 5 5 6 8 7 4 10 9 11 13 14 12 15 16 17 18 19 20 22 21 ...

Page 46: ...SSY 8 4951TKS175C METAL ASSEMBLY FRAME METAL ASSY 20LA70 CMO 4951TKS175A METAL ASSEMBLY FRAME METAL ASSY 20LA70 AUO 4951TKS175E METAL ASSEMBLY FRAME METAL ASSY 20LA70 AUO CKD 4951TKS175G METAL ASSEMBLY FRAME METAL ASSY 20LA70 CMO CKD 9 3313TP2029A MAIN TOTAL ASSEMBLY RZ 20LA70 CMO BRAND ML 041B 10 6871TPT280A PWB PCB ASSEMBLY POWER RM 20LA77 POWER TOTAL LIEN CHANG LIPS FOR CMO AUO 11 6871TST615A P...

Page 47: ...ION C930 0CH3104K946 100000PF 50V Z F 2012 R TP C934 0CH3104K946 100000PF 50V Z F 2012 R TP C935 0CH3104K946 100000PF 50V Z F 2012 R TP C936 0CH3104K946 100000PF 50V Z F 2012 R TP C937 0CH3104K946 100000PF 50V Z F 2012 R TP C938 0CH3104K946 100000PF 50V Z F 2012 R TP C939 0CH3104K946 100000PF 50V Z F 2012 R TP C940 0CH3104K946 100000PF 50V Z F 2012 R TP C943 0CH3104K946 100000PF 50V Z F 2012 R TP ...

Page 48: ... 22PF 1608 50V 5 R TP NP0 C53 0CC102CK41A 1000PF 1608 50V 5 R TP NP0 C56 0CC221CK41A 220PF 1608 50V 5 R TP NP0 DATE 2004 06 16 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C57 0CC221CK41A 220PF 1608 50V 5 R TP NP0 C58 0CC221CK41A 220PF 1608 50V 5 R TP NP0 C74 0CC102CK41A 1000PF 1608 50V 5 R TP NP0 C83 0CC102CK41A 1000PF 1608 50V 5 R TP NP0 C85 0CC102CK41A 1000PF 1608 50V 5 R TP NP0 C86 0CC102CK41...

Page 49: ... C3216 1 L15 0LC1032101A 10UH 10 3216 R TC FI C3216 1 L2 0LC1032101A 10UH 10 3216 R TC FI C3216 1 L8 0LC1032101A 10UH 10 3216 R TC FI C3216 1 L888 0LC0233002A 3 3UH CERATECH R TP L889 0LC0233002A 3 3UH CERATECH R TP L890 0LC0233002A 3 3UH CERATECH R TP DATE 2004 06 16 S AL LOC NO PART NO DESCRIPTION SPECIFICATION IC1107 0TF492509AA SI4925DY TP TEMIC 30V 6 1A S Q1150 0TR322809AB KTC3228 Y KTC2383 T...

Page 50: ... 1 10 W 5 1608 R TP R226 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R23 0RJ2701D677 2 7K OHM 1 10 W 5 1608 R TP DATE 2004 06 16 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R24 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R240 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R25 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R28 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R29 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R3 0RJ4700D677 470...

Page 51: ...217 0CH3104K946 100000PF 50V Z F 2012 R TP C1201 0CH6221K416 220PF 50V J NP0 2012 R TP C1202 0CH6101K416 100PF 50V J NP0 2012 R TP C1207 0CH6471K416 470F 50V J NP0 2012 R TP C1208 0CH6471K416 470F 50V J NP0 2012 R TP C1221 0CH6331K416 330PF 50V J NP0 2012 R TP C1223 0CH6471K416 470F 50V J NP0 2012 R TP C1224 0CH6471K416 470F 50V J NP0 2012 R TP C1210 0CH6471K416 470F 50V J NP0 2012 R TP C1212 0CH6...

Page 52: ...0RH0752D622 75 1 10W 5 D R TP R1212 0RH0752D622 75 1 10W 5 D R TP R1214 0RH0752D622 75 1 10W 5 D R TP R1216 0RH5102D622 51K 1 10W 5 D R TP R1226 0RH0472D622 47 1 10W 5 D R TP R1227 0RH0752D622 75 1 10W 5 D R TP R1228 0RH0752D622 75 1 10W 5 D R TP R1229 0RH0752D622 75 1 10W 5 D R TP R1201 0RH0222D622 22 OHM 1 10 W 2012 5 00 D R1205 0RH0222D622 22 OHM 1 10 W 2012 5 00 D R1224 0RJ1000H680 100 OHM 1 2...

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Page 55: ...Jun 2004 Printed in Korea P NO 3828TSL103L ...

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