LG CRD-8480M, Service Manual

Page 1: ...verage Access Time Max 7 200KB sec Sustained Transfer rate Photo CD Multisession Disc Spec compliant Multimedia MPC 3 Spec compliant Power Tray Loading Ejection Mechanism 3 Way Eject support Software O C Button Emergency Eject Closed Enclosure Built in ATAPI Interface Controller Software Volume Control 8 Times Digital Filter for CD Audio Front panel Volume Control for Headphone Output Built in MOD...

Page 2: ...MPACT 1 2 5 4 6 7 3 Figure 1 Front View 1 Digital Audio Output Connector This is a digital audio output connector or Video CD output connector You can connect this to the digital audio system or Video CD Board 2 Analog Audio Output Connector The Audio Output Connector connects to a sound card The supplied audio cable is a SoundBlaster type cable If you have a different sound card you will need to ...

Page 3: ...flickers but Speaker is silent 20 TROUBLESHOOTING GUIDE 1 Initial Lead in Operation Reset or Power On LED Flickers Pick Up moves to the inner Track Laser on the Pick Up lights Focus Search through moving up and down the lens of Pick Up Focus Servo On FEO IC501 Pin 12 signal generation Rotate disc Tracking Servo On TEO IC501 Pin 15 Signal generation Spindle Servo On DMSO TP25 Signal generation Read...

Page 4: ...ND Does H output in IC501 pin Check and replace R705 R706 Q701 and LED701 LED703 for DELL Is the CLOCK Frequency of IC501 pin 33 86MHz Check the power input pattern Check IC501 Check and replace X501 33 86MHz Is the CLOCK Frequency of IC501 pin 33 86MHz Check and replace IC501 YES OK NG YES YES NO NO NO 37 54 54 A 1 A 1 ...

Page 5: ...H output at IC201 pin Is the 1 3V at IC201 pin Check the pattern from IC501 pin to IC201 pin Check IC501 Check IC501 Check the PN301 and then replace the Sled Motor YES YES YES YES NO NO Replace IC201 NO NO 173 41 25 174 165 41 CH1 PIN174 FMO CH2 PIN173 FMO2 CH1 TP4 CH2 TP5 CH3 TP6 CH4 TP7 Fig B 1 FMO and FMO2 Signals Fig B 2 TP4 TP5 TP6 and TP7 Signals ...

Page 6: ...102 and then replace IC101 YES NO 10 181 Does the focus search signal appear at F0S0 TP9 Refer to Fig D 1 Is the 1 3V at IC201 pin Check IC501 YES YES YES NO NO Replace IC201 NO 25 Does the focus search signal appear between F TP10 and F TP11 Refer to Fig D 2 C The Laser of Pick Up doesn t light D The Pick UP lens doesn t move up and down D 1 ...

Page 7: ...ttern from pin of IC201 to pin of PN101 Check the PN101 Pick Up FFC Replace the Pick Up Replace PN101 or Pick Up FFC OK OK NG 34 35 1 4 CH1 TP9 FAO CH1 TP10 F TP11 F Fig D 1 F0S0 Signal Fig D 2 Focus Search Signal D 1 ...

Page 8: ...201 pin to PN201 YES OK 12 13 14 13 12 11 Check Spindle Motor FFC and then replace the Spindle Motor Does the signal appear at FEO IC501 pin when the R126 opened Refer to Fig E 1 YES YES YES NO NO Replace IC501 Replace IC501 Replace Pick Up NO Do the signal appear at FEO IC501 pin Refer to Fig E 2 Does the signal appear at F TP10 during focus search E Disc doesn t rotate 12 12 ...

Page 9: ...26 Fig E 2 FEO Signal CH1 TP15 FEO Fig E 3 DMS0 Signal CH1 TP25 DMS0 Fig E 1 S Curve CH1 TP15 S Curve ...

Page 10: ... 8 YES Is TOC area on the disc read Does LED flicker Does the other disc operate normally Normal Disc is defective YES YES NO 9 NO Does RFAC signal IC501 Pin appear Is Spindle Servo ON Does DMS0 signal TP25 appear YES YES NO NO NO Does RFI signal appear at IC501 pin 1 20 Replace IC101 Replace IC501 Replace IC501 Replace Main Circuit Board or MD Ass y NO Refer to C The Laser of Pick Up doesn t ligh...

Page 11: ... 25 Check the IC501 pin and then replace IC501 108 Check C702 YES YES YES Are L ch R ch signals appear at JK701 and Audio Line out connector each NO Check JK701 and L701 L703 Does Audio signal appear at IC701 pin NO 1 7 Is the voltage of IC701 pin 6 NO Replace IC701 G During Audio CD play LED flickers but Speaker is silent G 1 ...

Page 12: ...K801 or Audio Line out connector and Line or Jack normal NO Check the JK801 and Audio line pattern YES Check your sound card Audio Cable Speaker Volume and Headphone Jack Fig G 1 Audio Signal CH2 PIN3 of IC601 CH2 PIN12 of IC601 G 1 ...

Page 13: ... Circuit Board A Remove the Cabinet in the direction of arrow 4 See Fig 1 3 B Release 2 hooks a and remove the CD Tray C Remove the Soldering of the LD and LD B for the Loading Motor and then remove the Main Circuit Board D At this time be careful not to damage the 3 connectors of the Main Circuit Board 2 MECHANISM ASSY A Separate the Pick Up Unit from the Mechanism Assy B Release 1 screws C and t...

Page 14: ...ck up s left and right shift to find the track on the Disc 3 RF Signal A B C D RF Signal is converted to Data Signal in One Chip IC IC501 Three signals Focus Error Signal Tracking Error Signal and RF Signal above are I V converted and amplified at the IC501 and generated the Servo Control Signal and Data Signal Red laser Pick Up module Tracking Focusing B C E F D A ...

Page 15: ...sense 2 5 SL2 Slide non inverted output 2 6 SL2 Slide inverted output 2 7 GND GND 8 RSL1 Slide current sense 1 9 SL1 Slide non inverted output 1 10 SL1 Slide inverted output 1 11 GND GND 12 W Motor drive output W 13 V Motor drive output V 14 U Motor drive output U 15 RSP Spindle current sensie 16 HW HW sensor amp input 17 HW HW sensor amp input 18 HV HV sensor amp input 19 HV HV sensor amp input 2...

Page 16: ...26 IO3 37 LED 38 EJECT_ 39 PLAY_ 35 DVDD 36 TEST_EN 27 URD_ IO4 28 UP3_5 UT1 29 UP3_4 UT0 30 DGND 31 UNIT1_ IO5 32 UP3_2 UNIT0_ 33 UP3_1 UTXD 34 UP3_0 URXD 40 ICEMODE 41 UWR_ IO6 42 UALE 08 43 UP1_0 UA16 44 UP2_7 UA15 45 UP2_5 UA14 46 UP2_5 UA13 47 UP2_4 UA12 48 UP2_3 UA11 49 UP2_1 UA9 50 UPSEN_ 09 51 UP2_0 UA8 52 53 UP2_ UA10 DVDD3 19 RFON 1 RFI 206 205 OSN OSP 204 RVDD 203 V20 202 V13 201 V26 20...

Page 17: ...utput 13 FEP Analog Input Positive input of focusing error amplifier 14 TEN Analog Input Negative input of tracking error amplifier 15 TEO Analog Output Tracking error output 16 SBAD Analog Output Sub beam adder signal output 17 CSO Analog Output Central Servo control output 19 RFON Analog Output Negative RF output 20 RFOP Analog Output Positive RF output 206 OSN Analog Output RF offset loop integ...

Page 18: ... Alternate function Programmable GPIO 28 UP3_5 UT1 TTL I O Slew rate 50K pull_up Programmable bi directional I O Alternate function T1 Timer 1 input 29 UP3_4 UT0 TTL I O Slew rate 50K pull_up Programmable bi directional I O Alternate function T0 Timer 0 input 30 DGND Ground Ground pin for internal digital circuitry 31 UINT1_ IO5 TTL Output Host interrupt output connected to INT1_ pin of ICE low ac...

Page 19: ...pin for digital circuitry 69 UXI O19 TTL Output Slew rate P clock output for external system clock connected to X1 of ICE output 3 3V 70 71 72 73 74 75 76 77 UA 7 0 O 17 10 TTL Oouput Slew rate Lower address bus output for external device Alternate function Programmable output output 3 3V Xtal Interface 54 XTALI Input Xtal input The working frequency is 33 8688 MHz 55 XTALO Output Xtal output DRAM...

Page 20: ...try Audio Interface 117 ADGO VIO0 TTL I O Slew rate SMT 50K pull_up Digital Audio Output Versatile I O 0 The signal is either the Digital Audio Output which supplies the IEC 958 digital audio data when A0SEL00h RW7 1 and ADOE2Eh RW0 1 or the Versatile I O 0 pin otherwise Internal Audio DAC Interface 109 DACVSS Ground Ground pin for internal DAC circuitry 110 RO Analog Output Right channel of audio...

Page 21: ...l is negated pulled low during PIO to extend the host transfer cycle of any host register access Read or Write when the MT1199 is not ready to respond to a data transfer request When IORDY is not negated it is in a high impedance state In Ultra DMA transfers the signal becomes either DDMARDY_ Device Ultra DMA Ready that is asserted by the MT1199 to indicate to the host that it is ready to receive ...

Page 22: ...IPLL VCO circuitry 157 IPLLVSS Ground Ground pin for IPLL VCO circuitry Extended GPIO Interface 24 25 26 IO 3 1 TTL I O Slew rate 50K pull_up Programmable GPIO 58 IO7 CS_ TTL I O 50K pull_up Programmable GPIO Alternate function Chip select signal for flash ROM selection active low 165 IO0 TTL I O 50K pull_down Programmable bi directional I O Alternate function Serial bus reserved for MT1136 Mega I...

Page 23: ...tal circuitry 177 TEBC Analog Output Tracking error balance control PWM output 178 DGND Ground Ground pin for digital circuitry 179 PDMVSS Ground Ground for PDM circuitry 180 TRO Analog Output Tracking servo output PDM output of tracking servo compensator 181 FOO Analog Output Focus servo output PDM output of focus servo compensator 182 PDMVDD Analog Power for PDM circuitry Power 3 3V Signal Ampli...

Page 24: ...9E FLASH MEMORY RF DSP Decoder System controller SPINDLE MOTOR FOCUS COIL SLED MOTOR LOADING MOTOR 33 86MHz I F Cable R ch L ch Line out DRAM H O S T TRACKING COIL Disc Motor unit Optical Pick up MOTOR DRIVE GND GND 12V 5V GND GND 12V 30 BLOCK DIAGRAM ...

Page 25: ...002 003 030 020 A02 A01 020 051 032 050 029 434 021 434 434 413 413 413 001 413 430 028 027 026 025 033 435 013 010 009 008 011 012 005 034 014 420 434 031 016 015 004 006 431 431 A B C D E F G H 1 2 3 4 5 EXPLODED VIEW 7 8 ...