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LG RD-JT30 Service Manual
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LG RD-JT30 Service Manual

LG RD-JT30 Service Manual

Service manual
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Summary of Contents for LG RD-JT30

  • Page 2: Table Of Contents

    Contents 1.Safety Precautions 2.Servicing Precautions 3.Specifications 4.Exploded View 5.Replacement Parts List 6.Block Diagram 7.Packaging Description 8.Appearance Description 9.Alignment Procedure 10.How to disassemble the set 11.FAQ (Frequently Asked Questions) 12.Trouble Shooting Guide 13.Service Adjustment Guide 14.Firmware upgrade procedure 15.RS232 Codes 16.Schematics...

  • Page 6: Exploded View

    4. Exploded View The top illustration shows the parts from the front of the projector. The illustration on the next page shows the parts visible from the rear of the projector. To see exploded views of the case parts, major components and optical engine. Upper case Lamp Module Main Board...
  • Page 7 Lamp Blower DC-DC Board Power Board Rear Fan Sensor Board Color Drum Optical Engine Chip Board...

  • Page 8: Replacement Parts List

    6871VSN256A PCBA CHIP/BD LG JT30 60.J4910.001 3680V00113A ASSY LENS C1,C2 JT30 PROT 60.J4911.001 5018V00071A ASSY FOLD MIRROR MODULE JT30 60.J4912.CL1 6912B22006A ASSY CSD RD-JT30 LAMP MODULE 35.81J49.001 3680V00111A Glass front UVAR JT30 PROT 55.J4922.001 6871VSN257A PCBA SENSOR/BD LG JT30 65.J4905.011 3680V00112B COLOR DRUM 35MM 90DEG JT30 65.J4901.011...
  • Page 9 COLOR DRUM 35MM 80DEG JT30 60.J4910.001 3680V00113A ASSY LENS C1,C2 JT30 PROT 60.J4911.001 5018V00071A ASSY FOLD MIRROR MODULE JT30 60.J4912.CL1 6912B220006A ASSY CSD RD-JT30 LAMP MODULE 35.81J49.001 3680V00111A Glass front UVAR JT30 PROT 65.J4901.011 3680V00116A CTION LENS ZOOM JT31 CO 71.08060.000 6871VSN271A IC DMD 0.6SVGA 8060-624C 12DD...
  • Page 10 CABLE D-SUB/RCA 1800MM/SL705X 50.J2403.501 6851V00021P SIGNAL/C 15/15P (-9) 2500MM 50.72918.001 6851V00021R CABLE A/V RCA(R,W,Y)1500MM 50.72920.011 6851V00021V C.A MIN-DIN 4P S-VIDEO W/S 15 98.J5501.001 6710V00086E REMOTE CONTROLLER LG 6710V008 34-1 3550V00341A BATTERY COVER FOR REMOTE CONTROL 98.J1302.041 3880VA0025A SOFT CASE SL705X LG...

  • Page 11: Block Diagram

    6. Block Diagram...

  • Page 12: Packaging Description

    7. Packaging Description...

  • Page 14: Appearance Description

    8. Appearance Description...

  • Page 16: Alignment Procedure

    9. Alignment Procedure 1.DMD Bias Voltage Alignment Equipment:None Procedure: Watch DMD “Bias Voltage Bin” Label (Example: 8060-7bbc DDDD XXXXXXX M) Switch the DIP switch (SW2) on Main board according to the red character on the DMD chip 3. 00:...
  • Page 17 2.Color Wheel Delay Alignment Equipment: Battery Biased Silicon PIN Detector Oscilloscope Probe Procedure: Probe impedance matches 50 ohm Open Factory OSD, and select color wheel delay item Leave the image pure red (DMD red curtain) Put the detector on the screen that red image was projected. Watch the oscilloscope and notice the square waveform Use the “...
  • Page 18 4.HDTV Color Adjustment Procedure Equipment: Pattern generator (VG-828) Lux meter ( CL-100) Procedure: (a). Offset adjustment: Black coordinate spec: Osram lamp Oshio lamp 0.281 0.01 0.313 0.01 0.311 0.01 0.329 0.01 The variance of color coordinate via Pb offset and Pr offset: Pb offset Pb offset Pr offset...
  • Page 20 5.Optical Engine Assembly Procedure Note: 1.Every operator must check the dust/chip on every optical component before assembly. 2.Dust remove procedure is defined in document 01. No. Stop Check Action Review Equipment Remove dust on ROD Assemble Clip Rod Btm Screw driver Put a little glue on ROD align surface glue CA064 Pull the clip backward by...
  • Page 21 Assemble Make sure TIR is exactly put glue 727 on 4 Hsg Datum Glue 727 TIR on Hsg contacted related datum of Put CA064 on bottom surface of Activator A649 Assemble TIR on Hsg Assemble Follow the screw Assemble color drum/ bd_sensor on Screw torgue 1kgf Color Drum torgue...
  • Page 22 6. Power Alignment PFC Output voltage Output voltage range: 340 ~ 410VDC Output current: 0.025 ~ 0.45ADC Input voltage: 110VAC or 220VAC, 50 or 60Hz DC/DC Output voltage Output voltage Output voltage range Output current +3.3V 3.20 ~ 3.55V 0.5 ~ 1.7A 4.75~ 5.25V 0.1 ~ 0.15A +12V...

  • Page 23: How To Disassemble The Set

    10. How to disassemble the set 1. Lamp Module The lamp module is located at bottom of the projector. The lamp module behinds the lamp cover with 1 captive screw. After you replace the lamp module, you should reset the lamp hour counter. The switch interrupts power supply output to the projector if you remove the lamp cover.
  • Page 24 3. Grasp the handle on the lamp module and pull the module out of the lamp box. 2. Covers 2.1 Side bezel 1. Remove 4 screws under the projector of left side bezel, then remove it out of projector. 2. Remove 4 screws under the projector of right side bezel, then remove it out of projector.
  • Page 25 2.2 Front bezel 1. Remove the 2 screws under the projector of front bezel, then remove front bezel out of projector. 2.3 Rear bezel 1. Remove 2 screws under the projector of bottom bezel. 2. Remove 8 screws and 2 jack screws on the rear bezel. 3.
  • Page 26 2.4 Upper case 1. Pull the upper case out of projector. 2. Be sure to remove wire of keypad board, then the upper case can be removed.
  • Page 27 3. Main board 1. Remove 5 screws and 10 wires. 2. Be sure to remove 1 wire, then the main board can be removed.
  • Page 28 4. DC-DC Board 1. Remove 2 screws, 2 jack screws and 1 wire. 2. Be sure to remove connector from the power board.
  • Page 29 5. Front Fan 1. Remove 2 screws, then the front fan can be removed. 6. Power Board 1. Remove 4 jack screws and 2 wires, then the power board can be removed. 7. Rear Fan 1. Remove 2 screws, then the rear fan can be removed.
  • Page 30 8. Ballast Module 1. Remove golden screw. 2. Remove 3 wires. 3. Be sure to remove 1 wire, then the ballast module can be removed.
  • Page 31 9. Lamp Blower 1. Remove 2 screws, then the lamp blower can be removed. 10. Optical engine 1. Remove 4 screws, then the optical engine can be removed.

  • Page 32: Faq (Frequently Asked Questions)

    11. Frequently Asked Questions 1. Why the unit doesn’t power on? 1) Make sure the power cord is inserted into the AC adapter socket. 2) Make sure the power cord is inserted into the power outlet. 3) Wait 90 seconds after the projector is turned off before turning the projector back on.

  • Page 33: Trouble Shooting Guide

    12. Trouble Shooting Guide Optical Engine trouble shooting guide Debug Item Trouble Shooting Guide 1. Brightness 1.Check EE setting / Follow up EE alignment procedure 2.Check fold mirror position / re-align fold mirror to be closer to design position. 3.Check Rod lens at datum surface / put rod lens at right datum surface 4.Check Green color / If too green and over spec., change color drum 5.Change lamp 2.
  • Page 34 JT31 Electrical Debug Guide 1.chk voltage input from DC/B : 3.3V(TP23),5V(TP24),12V(TP34) 2.chk oscillator Y4,Y5 output frequency (Y4:16.257MHz, Y5:10MHz)) 3.chk MCLK(U37-5,130MHz) and DCLK(U39-5,40MHz) 4.chk U38 whether S/W inside or bad soldering System no work 5.chk Reset IC (U40) 6. change U35(bad soldering) 7.chk Abnorm al signal 8.chk Resetz(RN40),PW RGO OD(RN40) ,VSYNCZ(R182), HSYNCZ(R183), ACTDAT A(R184), CLKIN(R181)
  • Page 35 DDP1000 Debug Guide...

  • Page 38: Service Adjustment Guide

    13. Service Adjustment Guide 1. How to enter factory menu: 1) Press keypad <Power> key, Enter Power Off check state (Fig-1). (Fig-1). 2) Press keypad <Source> <Auto> key simultaneously, enter “Lamp Hour Info” layer (Fig-2). (Fig-2) Lamp Hours Info 3) Press keypad <Source>...
  • Page 39 2.Factory layer: 1) DMD layer (Fig-3): (Fig-3) DMD layer 1.1) CW delay: adjust color wheel delay. (Note this value Before Upgrade Software) 1.2) White peak: adjust DMD white peak. In PC mode default value set 10, in Video mode is 0.Software auto set this value as source find. 1.3) DLP Brightness: adjust DLP Brightness.
  • Page 40 2) ADC layer (Fig-4): (only available when input source is analog RGB) (Fig-4) ADC layer 2.1) ADC Brightness: ADC brightness auto calibration black. 2.2) ADC Contrast: ADC contrast auto calibration white. 2.3) ADC Offset RGB: value to tell you calibrate result. 2.4) ADC Gain RGB: value to tell you calibrate result.
  • Page 41 3.1) FAN: enter system fan status info layer. Lamp Sensor: lamp sensor temperature Lamp Fan Speed: lamp fan speed in RPM Blower Speed: Blower fan speed in RPM Power Sensor: Power sensor temperature Power Fan Speed: Power fan speed in RPM Fixed Fan Speed: Disable auto fan speed control and fix fan speed 3.2) PbPr: enter PbPr color control Layer.
  • Page 42 4) Optic layer (Fig-5): (Fig-5) Optic layer 4.1) Test Pattern: system auto produce pattern for engineer test. 4.2) Spoke light: unit display full white. 4.3) Curtain Red: unit display full color red. 4.4) Curtain Green: unit display full color green. 4.5) Curtain Blue: unit display full color blue.
  • Page 43 6) Others layer (Fig-7): (Fig-7) YPbPr layer 6.1) Gamma index: system auto select DLP gamma index 6.2) Gray value: adjust here to check DMD fail pixel. 6.3) Blue value: adjust here to check DMD fail pixel. 6.4) Scaling: tell you what scaling mode is using now. 6.5) Pc/PbPr Mode: index of input timing 6.6) RS232: Enable / Disable RS232 control...

  • Page 44: Firmware Upgrade Procedure

    14. Firmware Upgrade Procedure Step 1 Setup Flashloader in computer. Step 2 a. Connect download cable with computer and projector b. Connect power cord with projector and check power switch is OFF. Step 3 Execute FLASH loder.exe Step 4 Setting COM Port & Baud Rate...
  • Page 45 Step 5 a. Turn on the power switch of the projector, then the Program will target the Flash. b. HEX File Format choose Intel Extended c. File Name choose d. Operation choose Program Step 6 Start download firmware...
  • Page 46 Step 7 Download finished. Step 8 Turn off the power switch.

  • Page 47: Rs232 Codes

    15. RS232 Codes Event Packet Type command: Command Packet Header (7 bytes) Packet Payload (6 bytes) Power BE EF 02 06 00 97 CF AE 00 00 00 00 00 Auto BE EF 02 06 00 AB CA 92 00 00 00 00 00 Source BE EF 02 06 00 98 CA 9B 00 00 00 00 00...
  • Page 48 S-Video / Composite Video Picture Controls Command Packet Header (7 bytes) Packet Payload (25 bytes) Brightness + BE EF 03 19 00 95 52 03 4B 02 CC CC 00 00 00 00 CC x16 Brightness - BE EF 03 19 00 FB F8 04 4B 02 CC CC 00 00 00 00 CC x16 Contrast + BE EF 03 19 00 BF C4...

  • Page 49: Schematics

    DMD DRIVER DD [0:6 3] DD [0:63] TP67 TP64 VCC2 SCTRL-L TP68 P3P3V TRC-L TP66 TP71 TP70 TP65 TP72 D D 10 TP75 D D 3 D D 23 D D 9 TP74 TP69 TP76 D D 18 TP79 D D 5 D D 12 TP78 TP73...
  • Page 50 FLDATA[0:15] U 1A P3P3V AD12 FLADDR19 FLADDR19 FLADDR18 AE13 FLADDR18 FLADDR17 AF12 FLADDR17 AF13 FLADDR16 FLDATA15 FLADDR16 DQ15/A-1 FLADDR15 FLDATA14 AD14 FLADDR15 DG14 FLADDR14 FLDATA13 AD13 FLADDR14 DG13 FLDATA0 AE23 AF14 FLADDR13 FLDATA12 FLDATA0 FLADDR13 DG12 FLDATA1 FLADDR12 FLDATA11 AE22 AE14 FLDATA1 FLADDR12...
  • Page 51 VTERM VDR C G VTERM VDR C G C DC R83 R EFCLK REFCLK U15-20 110F SCLKN SYNCLKN PCLKM PCLKM D QB[0:8] MULT0 MULT0 MULT1 56.2F MULT1 RQ [0: 7] RQ [0:7] U15-C76 K4R271669D-TCS8 R Q0 DQB8 10P J R Q1 DQB7 DQB7 P2P5V...
  • Page 52 P2P5V P3P3V U 1E AB21 P2P5V P3P3V AB17 AB20 P2P5V P3P3V AB16 AB19 P2P5V P3P3V DDP1000 BULK DECOUPLING CAPS DDP1000 DECOUPLING FOR +3.3V DDP1000 DECOUPLING FOR+2.5V AB15 P2P5V P3P3V AB12 P2P5V P3P3V P3P3V P3P3V P2P5V P2P5V P2P5V P2P5V P2P5V P2P5V AB11 P2P5V P3P3V...
  • Page 53 DD [0:6 3] DD [0:63] U 1C MBRST[0:15] MBRST[0:15] U 5DD63 DD63 U 5DD62 DD62 U 5DD61 DD61 U 5DD60 DD60 DMDKSR16C U 5DD59 DD59 U 5DD58 DD58 0.1U K U 5DD57 U5-M2 VDD1 DD57 SACBUS U 5DD56 U 5-N4 VDD2 DD56 SACCLK...
  • Page 54 P12V 80 OHM 0.1U K 0.1U K 0.1U K 0.1U K BAT54SW BAT54SW BAT54SW BAT54SW ALVDD 80 OHM ALVDD 0.1U K 0.1U K 1000P J 1000P J 1000P J CKMTR1 39.2F 74V1G14S A8902 TP14 TP15 BRAKE OUTA C W Y3 BRAKEZ OUTA TP16...
  • Page 55 P3P3V 120 OHM P3P3V C104 C105 0.1U K 0.1U K R606 CK60M 39.2F 3.3K C OSC C OSCEN 60MHz P3P3V 120 OHM P3P3V C106 C107 0.1U K 0.1U K R607 CK100M 39.2F 3.3K MOSC EN 100MHZ...
  • Page 56 VNEGRAIL VNEG1 C109 C110 MBR0540T1 4.7U Z 4.7U Z C111 1 U Z MBR0540T1 P12V VPOSRAIL VPOS1 VPOS2 22UH C112 C113 MBR0540T1 4.7U Z C114 4.7U Z IRFL9014PC C115 4.7U Z 100KF R 69 4.7P J UMT2907A VPOS3 SHDN C116 VPOS4 4.7U Z LT1613CS5...
  • Page 57 VREF5 P12V P12V C120 0.1U K MMBT2222A P12V 24.3F U 14 VCC2 VCC2N1 24.3F VCC2N2 V C C2N4 VCC2 OPA237 C121 C122 QP1A 0.1U K 4.7U Z MUN5215DW1T1 0805 1210 UMT2907A VCC 2EN Z VCC2N6 QP1B 4.99KF MUN5215DW1T1 P12V VREF5 VPOSRAIL VPOSRAIL FZT649...
  • Page 58 MAIN BOARD P3P3V C126 0.1U Z TP22 TP18 U 18 TP302 R107 TP19 D[0:15] TP20 P3P3V OPEN P3P3V K EY0 L202 TP21 K EY1 K EY2 80 OHM TP301 K EY3 R108 R109 L201 RESETQ 3.3K FRO NTLOC K TP23 OPEN 20K2170005 80 OHM...
  • Page 59 U111 IR R C V R R140 74LVC1G126 U 25 VUSB VR-A data C136 C137 C138 C139 RST-A R142 VUSB 0.1U K 4.7U TZMC5V1 0.1U K These parts of this portion should be connected closely. C140 0.1U K The trace width of this portion should be greater than 25 mils.
  • Page 60 A VD D PVD D VOUT VOUT CAREFULY LAYOUT C169 C173 C174 C175 C176 C177 C178 C170 C180 C181 C172 C179 PVD D LD1117-3.3V LD1117-3.3V 0.1U Z 6.3V 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 6.3V 0.1U Z...
  • Page 61 C222 10P J GFBK R D K R181 C LKIN DCLK R D V R182 VSYNCZ R D H R183 GCLK GCLK H SYNCZ R246 OPEN R180 R184 ACTDATA GPENSOG GFBK D EN GREF G HS GBLKSPL GBLKSPL RESET_PW RESET R N34 GCOAST RV[0:7]...
  • Page 62 P3P3V P3P3V L301 120 OHM C252 U 37 C251 0.1U Z R237 P3P3V 0.1U Z U 38 R578 OPEN RMCK R206 MCKEXT ROMOEn ROMOEn ROMWEn U18-X1 ROMWEn U18-X2 6240019001 16.257MHZ D[0:15] R207 ICS501 BYTE 820K C253 C254 10P J 10P J R208 R209 3.3K...
  • Page 63 SI2315DS Q106 P12V R637 C609 P12V R615 R616 0.1U K 2.2K 2.2K Q107 R638 10K FAN-SW Q112 2N3904 C262 R639 R220 SI4431DY-T1 R618 Q111 Q110 FAN1-P U 43 2N3904 2N3904 Q104 5.6K R631 SMBCLK C602 SMBDATA 10U Z R617 SI4431DY-T1 FAN1-B R602 R603...
  • Page 64 D N101 D N102 D N103 BAV99 BAV99 BAV99 J103 TP155 1N4148 D203 TP159 TP156 D N104 BAV99 TP165 R ED -G ND TP164 TP157 PC -RIN RAIN -B R A IN G REEN -GND TP161 TP166 PC -GIN G AIN-B G AIN TP167 BLUE-GND...
  • Page 65 L110 P3P3V V3P3 L111 1000 OHM 1000 OHM 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U U201 C511 R527 0.1U 0.1U 0.1U 0.1U 0.1U 0.1U VVS-IN C510 C512 C513 C514 C515 C584 R528 C517 VHS-IN VPC -STAND YBY R529 OPEN C516 C518 C519 C520 C521...
  • Page 66 P3P3V 3P3V L112 2P5V 2P5VJ1 2P5V 2P5VJ2 L113 L114 1000 OHM C544 C546 C547 C548 C549 C550 C551 C552 1000 OHM 1000 OHM C545 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z C560 C562 C563...
  • Page 67 P3P3V 3V3M L115 1000 OHM C569 C571 C572 C573 C574 C575 C576 C577 C578 C579 C570 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 0.1U Z 6.3V D-ADD R[ 0:10] 3V3M U 109C D -ADDR0...
  • Page 68 R624 R640 P3P3V U209A P3P3V D -FLIP U211 RESETZ SN 74HC74PWR 74AHC1G32GW U208 74V1G14S RESET R627 LAMPLIT LAMPLIT-PW R625 C603 0.1U K P3P3V P3P3V U210 RESET_PW R620 240K U206 U207 74AHC1G08 C605 1N4148 D202 74V1G14S 74V1G14S 1N4148 C606 C604 R621 0.1U K D204...
  • Page 69 HOLE-V8 HOLE-V8 HOLE-V8 HOLE-V8 MARK1 MARK2 MARK3 MARK4 MARK5 MARK6 MARK7 0.1U K 0.1U K 4.7U Z MARK9 MARK11 MARK12 MARK14 MARK17 MARK18 MARK20 FM-6038LM 20L1033003 MARK8 MARK10 MARK13 MARK15 MARK16 MARK19 MARK21 MARK22 MARK23 MARK24...
  • Page 71 PAD 1 G N D K EY_IN3 OPTION SOU RCE K EY_IN2 BLANK K EY_IN1 K EY_IN0 FPCF_5P ENTER POW ER AUTO MARK1 MARK2 MARK3 MARK4 MARK5 MARK6 MARK7 MARK9 MARK11 MARK12 MARK14 MARK17 MARK18 MARK20 MARK8 MARK10 MARK13 MARK15 MARK16 MARK19 MARK21...
  • Page 75 Chapter 1 Engineering Specification Tested under 60” (diagonal) image size unless other specified. 1.0 Optical Performance Measurement Details refer to Appendix A. 1.1 ANSI Brightness 1.1.2 Minimum 1.2 Brightness Uniformity 1.2.2 Minimum 1.3 Contrast Ratio 1.3.1 ANSI Contrast 250:1 1.3.2 FOFO Contrast 800:1 1.4 Light Leakage 1.4.1 Light Leakage in...
  • Page 76 (Clear level specified by limit sample) 1.5M and 8M X Visible all over screen ( Visible level specified by limit sample Focus condition: uniformly focused by oberver 2.7 Lateral Color <2/3 Pixel 2.8 DMD Image Quality See Appendix D 3.0 Mechanical Specification 3.1 Dimensions 248.7L x 170.5W x 59H major (mm) 3.2 Weight...
  • Page 77 7.0 Regulatory Safety UL Approved (UL 1950, CSA950), TUV-GS, CCC, CB Report FCC Class B requirements, BSMI, VCCI, C-Tick CE Marks Directive 73/23/EEC; Directive 89/336/EEC; Air 8KV, Contact 6KV, Criteria B 8.0 Reliability 8.1 General Failure Def. Adhere to Appendix B 8.2 MTBF 12000 hours except for DMD panel, Lamp and Fan 8.3 Lamp lifetime...
  • Page 78 12.2 Video Input RCA jack (Yellow) Video amplitude 1.0 V : Impedance 75 12.3 S-Video Input 4 pin Mini-Din (Female) Y: Luminance amplitude 1.0 V : Impedance 75 C: Chroma amplitude 0.268 V : Impedance 75 13.0 Control Interface 13.1 IR Receiver IR Receiver X 2 (Front, Rear) Angle: 7m at 15 13.2 Mouse Emulation...
  • Page 79 Appendix A Optical Measurement 1.Scope: This document describes critical optical related test definitions and Instructions for data or video projectors. The other general terminologies are specified in ANSI IT7.228-1997. 2.General Requirements The unit under test should be allowed to stabilize without further adjustment for a minimum of 5 minutes, at nominal ambient room temperature of 25 C, before making measurements.
  • Page 80 A2. BRIGHTNESS UNIFORMITY Brightness Uniformity = Minimum (L10,L11,L12,L13)/ Average (L1,L2,L3,L4,L5,L6,L7,L8,L9) A3. JBMA UNIFORMITY JBMA Uniformity = Average (L1,L3,L7,L9)/ L5 A4. ANSI CONTRAST ANSI Contrast = Average lux value of the white rectangles/Average lux value of the black rectangles Contrast Ratio shall be determined from illuminance values obtained from a black-and-white ”chessboard”...
  • Page 81 A9. THROW RATIO Throw ratio = projection distance / the width of the projected image A10. ZOOM RATIO Zoom ratio = maximum / minimum image diagonal size at a fixed projection distance A10. FOCUS RANGE The minimum/maximum focus distance is the minimum/maximum projection distance (The distance between the outermost element of projection lens and screen), expressed in meter, at which the image is still at its acceptable focus level.(acceptable focus level is specified by FOCUS LIMIT SAMPLE approved by customer)
  • Page 82 Appendix B Design Verification Test Procedure B1. Purpose This standard establishes the environmental specification for projector related products, which defines the level of product performance and reliability in the field. It is not necessary the intent of these specification to simulate a typical user environment, but rather to provide for a level of product robustness that when applied over a wide range of manufacturing variability and environmental usage conditions, which is recommended for product assurance testing reference.
  • Page 83 B4 Test Order Atmospherics, Dynamic, and Safety test sets require separate units and can be processed in parallel. EUT (EUT: Equipment under Test) testing shall be performed serially within each set. Set 1 (2 units) Set 2 (2 units) Set 3 Dynamics: Atmospherics: Safety/EMC:...
  • Page 84 Appendix C Noise Testing Standard Desk high is 75 cm Projector have to closed to the edge of desk Noise meter high is 150 cm & title 30 degree The distance between noise meter and projector is 100 cm Measured four surfaces and calculated the noise value by log average. We have designed excel files to calculate this value.
  • Page 85 Appendix D DMD Image Quality 1. SCOPE This document specifies the image quality requirements applicable to the DLPTM .6SVGA Component Set. The Component Set provides the DLPTM .6SVGA Projector with digital imaging functionality based on Digital Micromirror Device (DMD) technology. 2.
  • Page 86 2.8 Pond of Mirrors (POM) POM is a rectangular array of off-state mirrors surrounding the active area. 2.9 Eyecatcher Eyecatcher's are blemishes appearing in the area outside of the Active Area. These are due to particles and various DMD window or window aperture “defects” including: digs, voids, and scratches.
  • Page 87 NOTE: If linear degamma is not used then the Microsoft Paintbrush values must be adjusted to match the degamma table being used in order to generate an equivalent blue level on the test screen image. 2.13 Gray 30 Screen The Gray 30 screen is used to test for the reset boundary artifact. Refer to Figure 1 for configuration.
  • Page 88 Reset Gray 30 1. No reset boundary artifact will be visible on Microsoft boundary Gray 30 artifact Eyecatcher Gray 10 1. No Eyecatcher or border artifact will be lighter than Border Microsoft Gray 10 Artifacts 2. All Eyecatcher's and border artifacts > 5 inches from the POM are acceptable Streaks Blue 60...
  • Page 89 Appendix E Electrical Specification Content: 1. The Functions Of MICOM 1.1 General functions 1.2 System Control Functions 2. User Interface : Key Service 2.1 Local Keys 2.2 Remocon Keys 2.3 Features of Keys...

  • Page 90: The Functions Of Micom

    1. The Functions of MICOM 1.1 General function 1.1.1 Input Signals Terminology Input Signal Type Input Signal Format Signal Path In this Spec. (OSD Terminolgy) Analog RGB D-Sub YCbCr/YPbPr 480i,480p, 720p,1080i D-Sub Video Composite Video RCA (AV Interface Board) S-Video S-Video (A/V Interface Board) 1.1.2 Auto Detection of the Input Signal No signal detection : BLUE Background,...
  • Page 91 1024 x 768 43.479 Hz 35.522 kHz 1024 x 768 60.004 Hz 48.363 kHz 1024 x 768 70.069 Hz 56.476 kHz 1024 x 768 75.029 Hz 60.023 kHz 1024 x 768 84.997 Hz 68.677 kHz SXGA 1152 x 864 60.053 Hz 54.348 kHz 1152 x 864 70.016 Hz...

  • Page 92: System Control Functions

    LAMP TIME : display or initialize the lamp time. Language : selects OSD Language, according to MRS KEYSTONE : V Keystone correction Screen LOGO : displays the LG logo image for blanking the screen when system starts 1.2 System Control Functions 1.2.1 POWER CONTROL...
  • Page 93 *You can change Temperature range according to your temperature condition. 1.2.2.1 Lamp On Error state If Lamp is not lit normally, display the LEDs above , you have to turn the projector off. 1.2.2.2 Lamp Time over Error state Lamp Time Display : On OSD Menu Case 1: 1400 hours <...

  • Page 94: User Interface : Key Service

    1.2.2.5 Fan On Error state If Fan is not operated normally, displays Fan On Error LEDs & Display Fan on Error OSD.. 1.2.2.6 Lamp Case_Open state If Lamp case is opened abnormally or when you replace used lamp with a new one, it displays lamp case_open LEDs .

  • Page 95: Remocon Keys

    2.2 Remocon Key 2.2.1 Remocon Key Code & Structure 2.2.1.1 Remocon key code KEYS Function Code POWER SOURCE MENU MOUSE LEFT CLICK MOUSE RIGHT CLICK MOUSE DRAG ENTER BLANK STILL RESIZE MUTE VOLUME UP VOLUME DOWN AUTOTRACKING ZOOM UP ZOOM DOWN KEYSTONE UP KEYSTONE DOWN...
  • Page 96 LASER AUTO KEYSTONE ZOOM [ Front ] [ Rear ] 2.2.2 REMOCON & JOYSTICK IR Signal wave form 2.2.2.1 Remocon waveform : NEC format 2.2.2.1.1 Configuration of Flame START LG ID = Inverse LG ID = $FB Data Inverse Data...
  • Page 97 First code Repeat code Repeat code 108ms @ 2.2.2.2 Joystick waveform & directional pointing data 2.2.2.2.1 Configuration of Flame START LG ID = X DATA Y DATA SYSTEM : 0 = TV 1 = VCR 2 = Audio 3 = Direction 2.2.2.2.2 Bit Description...
  • Page 98 2.2.2.2.3 Flame interval 80ms @ 455kHz 2.2.2.2.4 Directional Pointing Data East South 2.2.2.2.4.1 Mouse Pointer When we control Mouse Pointer, we use all 16 directions code differently. But when we control Menu OSD, we only use 4 directions like below. Key code function Function Up...
  • Page 99 2.2.3 Operating ranges of the Keys Stand By Service Repeat Menu On No OSD No Sync GUI Builder keys State(SDK1.9) POWER...
  • Page 100 2.3.2 SOURCE Key (Local & Remocon) Be set in the last selected mode when projector is turned on. Source change order Case 1 : A/V Board connected. : RGB Video S-Video 2.3.3 Menu Key Main Menu On/Off be able to clear MENU OSD by pressing Menu key in the first step of MENU OSD. adjust items or select items by Volume +/ -, JOYSTICK be able to enter the lower level of menu by pressing Volume (-) key or pushing JOYSTICK right...
  • Page 101 case : AV ( VIDEO / S-VIDEO ) / HD VIDEO menu Range Contrast 0 ~ 100 Brightness 0 ~ 100 Color 0 ~ 100 Tint -50 ~ +50 Reset Press Enter to Reset Video sub-menu OSD Display time : Until being cleared. 2.3.3.2 POSITION Menu selected by pressing Volume (+) key or pushing JOYSTICK right on the position of POSITION Menu...
  • Page 102 Volume +/ - key : move to lower level of Menu or CANCEL JOYSTICK : select items (move Cursor ) or adjust items (in lower level of menu) Enter key : Save & Return Be set in the last selected mode when projector is turned on. Different MENU between RGB and AV SPECIAL Menu Selection...
  • Page 103 2.3.6 Mouse Drag Key Operates as a mouse drag on/off toggle key when remote mouse function is used. Once drag toggle key is pressed, moving joystick operates as mouse drag function. Drag function can be released by toggling the key 2.3.7 ENTER Key display the present source &...
  • Page 104 2.3.15-16 Zoom Up/Down Key Zoom: 25 steps Zooming up/down by Zoom Up/Down KEY Scrolling by Joystick Zoom OSD Display Time : 5 seconds. 2.3.18 JOYSTICK Mouse 16 directions, Volume + / - Moves cursor or adjusts selected item value when OSD menu is on. Scrolls the screen when zoom function is on.
  • Page 105 Appendix F Power Supply Specification F.1 Input Power Specification Specification Description Input Voltage Range The unit shall meet all the operating requirements with the range 90 ~ 264 Frequency Range The unit shall meet all the operating requirements with an input frequency range 47 ~ 63 Hz Power Consumption Normal operation: 240 W max.

  • Page 106: Chapter 2 Spare Parts List

    ASSY COLOR DRUM MODULE JT30 55.J4922.001 PCBA SENSOR/BD LG JT30 60.J4910.001 ASSY LENS C1,C2 JT30 PROT 60.J4911.001 ASSY FOLD MIRROR MODULE JT30 60.J4912.CG1 ASSY CSD RD-JT30 LAMP MODULE 65.J4901.011 PROJECTION LENS ZOOM JT31 CO 54.J4913.001 KEYPAD BD/JT30 55.J4905.001 PCBA DC-DC/BD LG JT30 55.J4908.001 PCBA IR/BD LG JT30 55.J4911.001...
  • Page 107 LG Projector RD-JT30 99.J4977.L31 PART NO DESCRIPTION 35.80J49.091 LENS ROD 6.1X4.4X40 JT30 55.J4906.001 PCBA CHIP/BD LG JT30 60.J4911.001 ASSY FOLD MIRROR MODULE JT30 35.81J49.001 Glass front UVAR JT30 PROT 55.J4922.001 PCBA SENSOR/BD LG JT30 65.J4905.011 COLOR DRUM 35MM 90DEG JT30 65.J4901.011...
  • Page 108 49.J5501.001 MANUAL USER LG JT31/30 49.J5502.001 QUICK START GUIDE LG JT31/30 27.01218.191 CORD H03VV-F3G(MI) 2500MM CEE 27.01418.011 CORD H05VV-F(MI*3)6A250V S-AF 27.02718.201 CORD H05VV-F(MI) 10A250V2500U 27.04318.031 CORD VCTF3G(MI)7A125V 1800 T- 50.73213.501 CABLE 4P USB A-B 1800MM BLACK 50.J2401.001 CABLE D-SUB/RCA 1800MM/SL705X 50.J2403.501...
  • Page 109 Chapter 3 Production Description and operation 1. Shipping Content...
  • Page 110 2. Product Description...
  • Page 112 3. Remote Control Description...
  • Page 115 4. Installation...
  • Page 117 5. Operation A. User OSD...
  • Page 122 6. Packing Description...
  • Page 125 7. Appearance Description...
  • Page 128 8. Lamp Replacement...
  • Page 129 9. Shutdown...
  • Page 130 Chapter 4 Circuit Operation Theory JT31 DMD projector being using the SVGA DMD Engine made by BenQ, it includes front end circuitry, DMD driver circuitry and other peripheral circuitry. The front end circuitry digitizes the input analog VGA and TV signals and make a scaling processes. The DMD driver circuitry is transferring the front-end circuitry to DMD chip.
  • Page 131 The video decoder VPC3230D process multi-standard TV video signal input. The TV video signal support both of composite and S-video input and output YUV format to de-interlace processor FLI2200. The FLI2200 is high performance to enhance video quality. The DDP1000 transfer signal from PW166 to DMD for driving DMD mirror operation. Direct Rambus Memory The DDP1000 utilizes a high speed Direct Rambus Memory.
  • Page 132 2. Frond end circuitry 2.1 Frond end block diagram...
  • Page 133 DDC interface – Providing Digital Display Channel , which include VCC(Pin9) , SCL(Pin15) , SDA(Pin12) . Analog Flat Panel Interface (ADC Converter) , AD9883 The ADC converter digitizes the input analog RGB data signal from D_SUB and output the digital data streams to Image Processor.The normal voltage level of analog RGB input signals is about 0.7V , while the ADC digital signal output to Image Processor is LVTTL level , about 3.3V.
  • Page 134 signal for DMD driver. DEN – Data enable signal output to DMD BD, provided as a valid data indicator signal for DMD driver. VCLK – V-port pixel clock . VPEN – V-port data enable . VVS – V-port Vertical Synchronization . VHS –...
  • Page 135 3. DMD driver circuitry 3.1 DMD driver block diagram...
  • Page 136 4.. JT31 Lamp on Sequence Signal Voltage Change Description PWRGOOD Low High After the power key pressed 3 second continuously, the POWERON signal will activate. RESETZ Low High DDP1000 will begin initialization. LAMPEN Low High Lamp lights up. LAMPLITZ High Low Lamp on indication for DDP1000 LAMPLIT Low High...
  • Page 137 6.2. general specification Input voltage : AC 90~264V Input Frequency: 47~63Hz Input power: 230W max The power circuit shall supply DC power outputs as followings: Output Voltage Typical load current 380V 0.45A 3.3V 1.8A 0.15A 0.8A 6.3. Circuit Operation Theory 6.3.1 EMI filter L653 R651A...
  • Page 138 6.3.3 Power Factor Correction...
  • Page 139 The Power Factor Controller IC is L6561 , The function of each pins described as follow. pin 1 : voltage feedback input pin 5 : zero current detect input pin 2 : compensation pin 6 : gnd pin 3 : multiplier input pin 7 : drive output pin 4 : current sense input pin 8 : vcc...
  • Page 140 6.3.6 Power module IC...
  • Page 141 The power supply adapt a single feedback circuit of 12.7V. It used IC701 for voltage regulation and IC691 for primary-secondary isolation. The output voltage will be controlled by IC690 pin 1 (feedback) ,the duty cycle of MOSFET will be decided to control the output voltage.
  • Page 142 Chapter 5 Alignment Procedure 1.DMD Bias Voltage Alignment Equipment:None Procedure: 1. Watch DMD “Bias Voltage Bin” Label (Example: 8060-7bbc DDDD XXXXXXX 2. Switch the DIP switch (SW2) on Main board according to the red character on the DMD chip 3. 00:...
  • Page 143 2.Color Wheel Delay Alignment Equipment: Battery Biased Silicon PIN Detector Oscilloscope Probe Procedure: Probe impedance matches 50 ohm Open Factory OSD, and select color wheel delay item Leave the image pure red (DMD red curtain) Put the detector on the screen that red image was projected. Watch the oscilloscope and notice the square waveform Use the “...
  • Page 144 3.PC Color Alignment Procedure Equipment: Pattern generator Procedure: 1. Connect power, D-sub, into projector. 2. Change pattern generator to pattern 43 5-DISC. 3. Light on projector 4. Enter factory mode. 5. Choose ADC Brightness item to Press. 6. Choose ADC Contrast item to Press. 7.
  • Page 145 4.HDTV Color Adjustment Procedure Equipment: Pattern generator (VG-828) Lux meter ( CL-100) Procedure: (a). Offset adjustment: 1. Black coordinate spec: Osram lamp Oshio lamp 0.281 0.01 0.313 0.01 0.311 0.01 0.329 0.01 2. The variance of color coordinate via Pb offset and Pr offset: Pb offset Pb offset Pr offset...
  • Page 147 5.Optical Engine Assembly Procedure Note: 1.Every operator must check the dust/chip on every optical component before assembly. 2.Dust remove procedure is defined in document 01. No. Stop Check Action Review Equipment Remove dust on ROD Assemble Clip Rod Btm Screw driver Put a little glue on ROD align glue CA064 surface...
  • Page 148 Assemble Assemble C3 module on hsg Screw Driver C3 module on hsg Assemble Make sure TIR is exactly put glue 727 on 4 Hsg Datum Glue 727 TIR on Hsg contacted related datum of Put CA064 on bottom surface of Activator A649 Assemble TIR on Hsg Assemble...
  • Page 149 6. Power Alignment PFC Output voltage Output voltage range: 340 ~ 410VDC Output current: 0.025 ~ 0.45ADC Input voltage: 110VAC or 220VAC, 50 or 60Hz DC/DC Output voltage Output voltage Output voltage range Output current +3.3V 3.20 ~ 3.55V 0.5 ~ 1.7A 4.75~ 5.25V 0.1 ~ 0.15A +12V...
  • Page 150 Chapter 6 Trouble Shooting...
  • Page 151 Optical Engine trouble shooting guide Debug Item Trouble Shooting Guide 1. Brightness 1. Chk EE setting / Follow up EE alignment procedure 2. Chk fold mirror position / re-align fold mirror to be closer to design position. 3. Chk Rod lens at datum surface / put rod lens at right datum surface 4.
  • Page 152 JT31 Electrical Debug Guide 1.chk voltage input from DC/B : 3.3V(TP23),5V(TP24),12V (TP34) 2.chk oscillator Y4,Y5 output frequency (Y4:16.257MHz, Y5:10MHz)) 3.chk MCLK (U37-5,130MHz) and DCLK(U39-5,40M Hz) 4.chk U38 whether S/W inside or bad soldering System no work 5.chk Reset IC (U40) 6.
  • Page 153 DDP1000 Debug Guide...
  • Page 156 POWER BOARD trouble shooting guide...
  • Page 157 DMD DRIVER DD [0: 63] DD [0: 63] TP67 TP64 V CC2 SCTRL-L TP68 P3P3V TRC-L TP66 TP71 TP70 TP65 TP72 DD 10 TP75 D D3 DD 23 TP74 TP69 D D9 TP76 DD 18 TP79 D D5 DD 12 TP78 TP73 DD 11...
  • Page 158 FLDATA[0:15] P3P3V AD12 FL A DDR19 FLADDR19 FL A DDR18 AE13 FLADDR18 FL A DDR17 AF12 FLADDR17 AF13 FL A DDR16 FLDATA15 FLADDR16 DQ15/A-1 AD14 FL A DDR15 FLDATA14 FLADDR15 DG14 FL A DDR14 FLDATA13 AD13 FLADDR14 DG13 FLDATA0 FL A DDR13 FLDATA12 AE23 AF14...
  • Page 159 VTERM V DRC G VTERM V DRC G CD CR 83 RE FCLK REFCLK 110F U15-20 S CLKN SYNCLKN PCLKM PCLKM DQ B[0:8] MULT0 MULT0 MULT1 56.2F MULT1 RQ [0: 7] RQ [0:7] GND:4,5,8,17,21 VDRCG:3,9,16,22 U15-C76 K4R271669D-TCS8 NC:19 R Q0 DQB8 10P J R Q1...
  • Page 160 P2P5V P3P3V AB21 P2P5V P3P3V AB17 AB20 P2P5V P3P3V AB16 AB19 P2P5V P3P3V DDP1000 BULK DECOUPLING CAPS DDP1000 DECOUPLING FOR +3.3V DDP1000 DECOUPLING FOR+2.5V AB15 P2P5V P3P3V AB12 P2P5V P3P3V P3P3V P3P3V P2P5V P2P5V P2P5V P2P5V P2P5V P2P5V AB11 P2P5V P3P3V P3P3V P3P3V...
  • Page 161 DD [0: 63] DD [0: 63] U 1 C MBRST[0:15] MBRST[0:15] U5 DD63 DD63 U5 DD62 DD62 U5 DD61 DD61 U5 DD60 DD60 DMDKSR16C U5 DD59 DD59 U5 DD58 DD58 0.1U K U5 DD57 U5-M2 VDD1 DD57 SACBUS U5 DD56 U 5-N4 VDD2 DD56...
  • Page 162 P12V 80 OHM 0.1U K 0.1U K 0.1U K 0.1U K BAT54SW BAT54SW BAT54SW BAT54SW A LVDD 80 OHM AL VDD 0.1U K 0.1U K 1000P J 1000P J 1000P J CKMTR1 39.2F 74V1G14S A8902 TP14 TP15 BRAKE OUTA C W Y 3 BRAKEZ OUTA TP16...
  • Page 163 P3P3V 120 OHM P3P3V C104 C105 0.1U K 0.1U K R606 CK60M 39.2F 3.3K CO S C CO S CEN 60MHz P3P3V 120 OHM P3P3V C106 C107 0.1U K 0.1U K R607 39.2F CK100M 3.3K MOSC MOSCEN 100MHZ Benq Corporation Project Code Model Name OEM/ODM Model Name...
  • Page 164 V NEGRAIL VNEG1 C109 C110 MBR0540T1 4. 7U Z 4. 7U Z C111 1 U Z MBR0540T1 P12V VPOSRAIL VPOS1 VPOS2 22UH C112 C113 MBR0540T1 4. 7U Z C114 4. 7U Z IRFL9014PC C115 4. 7U Z 100KF 4.7P J UMT2907A VPOS3 SHDN...
  • Page 165 VREF5 P12V P12V C120 0.1U K MMBT2222A P12V 24.3F V CC2 24.3F V CC2N1 V CC2N2 V CC2N4 V CC2 OPA237 C121 C122 QP1A 0.1U K 4. 7U Z MUN5215DW1T1 0805 1210 UMT2907A V CC2 ENZ V CC2N6 QP1B 4.99KF MUN5215DW1T1 P12V V CC2EN...

  • Page 166: Main Board

    MAIN BOARD P3P3V C126 0. 1U Z TP22 TP18 TP19 TP302 R107 D[0 :15] TP20 P3P3V OPEN P3P3V K EY0 L202 TP21 K EY1 K EY2 80 OHM TP301 K EY3 R108 R109 L201 RESETQ 3.3K FRONTLOCK TP23 OPEN 20K2170005 80 OHM P3P3V P3P3V...
  • Page 167 U111 USBSW I R RC V R R140 74LVC1G126 VUSB VR-A data C136 C137 C138 C139 RST-A R142 VUSB 0. 1U K TZMC5V1 4.7 U 0. 1U K These parts of this portion should be connected closely. C140 0. 1U K The trace width of this portion should be greater than 25 mils.
  • Page 168 AV DD PV DD VOUT VOUT CAREFULY LAYOUT C169 C173 C174 C175 C176 C177 C178 C170 C180 C181 C172 C179 PV DD LD1117-3.3V LD1117-3.3V 0. 1U Z 0. 1U Z 6.3V 0. 1U Z 0. 1U Z 0. 1U Z 0.
  • Page 169 C222 10P J GFBK R DK R181 C L KIN DCLK R DV R182 V S YN C Z R D H R183 GCLK H S Y NC Z GCLK R246 OPEN R180 R184 ACTDATA GPENSOG GFBK D EN GREF G HS GBLKSPL RESET_PW...
  • Page 170 P3P3V P3P3V L301 120 OHM C252 C251 0. 1U Z R237 P3P3V 0. 1U Z 130MHz OPEN R578 RMCK R206 MCKEXT ROMOEn ROMOEn ROMWEn U18-X1 ROMWEn 6240019001 U18-X2 16.257MHZ D[0 :15] R207 ICS501 BYTE 820K C253 C254 10P J 10P J R208 R209 3.3K...
  • Page 171 SI2315DS Q106 P12V R637 C609 P12V R615 R616 0. 1U K 2.2K 2.2K Q107 R638 FAN -SW Q112 2N3904 C262 R639 R220 SI4431DY-T1 R618 Q111 Q110 F AN1-P 2N3904 2N3904 Q104 R631 5.6K SMBCLK C602 SMBDATA 1 0U Z R617 SI4431DY-T1 F AN1-B R602...
  • Page 172 DN101 DN102 DN103 BAV99 BAV99 BAV99 J103 TP155 1N4148 D203 TP159 TP156 DN104 BAV99 TP165 RE D- GND TP164 TP157 P C -RIN RAI N-B R AI N G RE EN-GND TP161 TP166 PC- GIN GA IN-B G AIN TP167 BL UE-GND TP162 TP158...
  • Page 173 L110 P3P3V V3P3 L111 1000 OHM 1000 OHM 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U U201 C511 R527 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U VV S-IN C510 C512 C513 C514 C515 C584...
  • Page 174 P3P3V 3P3V L112 2P5V 2P5VJ1 2P5V 2P5VJ2 L113 L114 1000 OHM C544 C546 C547 C548 C549 C550 C551 C552 1000 OHM 1000 OHM C545 0. 1U Z 0. 1U Z 0. 1U Z 0. 1U Z 0. 1U Z 0. 1U Z 0.
  • Page 175 P3P3V 3V3M L115 1000 OHM C569 C571 C572 C573 C574 C575 C576 C577 C578 C579 C570 0. 1U Z 0. 1U Z 0. 1U Z 0. 1U Z 0. 1U Z 0. 1U Z 0. 1U Z 0. 1U Z 0.
  • Page 176 OPEN R624 R640 RESETQ P3P3V U209A P3P3V D- FLIP U211 RESETZ SN74 HC74PWR 74AHC1G32GW U208 74V1G14S RESET R627 LAMPLIT LAMPLIT-PW R625 C603 0.1U K OPEN P3P3V P3P3V U210 RESET_PW R620 240K U206 U207 74AHC1G08 C605 1N4148 D202 74V1G14S 74V1G14S 1N4148 C606 C604 R621...
  • Page 178 Form No: ACM0-0B-003-24 (010918)
  • Page 179 Form No: ACM0-0B-003-24 (010918)
  • Page 180 Form No: ACM0-0B-003-24 (010918)
  • Page 181 Form No: ACM0-0B-003-24 (010918)
  • Page 182 Form No: ACM0-0B-003-24 (010918)
  • Page 183 Form No: ACM0-0B-003-24 (010918)
  • Page 184 Form No: ACM0-0B-003-24 (010918)
  • Page 185 Form No: ACM0-0B-003-24 (010918)
  • Page 186 Form No: ACM0-0B-003-24 (010918)

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