LG CRD-8483B Service Manual Download Page 25 | Manualshive

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Summary of Contents for CRD-8483B

Page 1: ...st 75ms Average 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 Bui...

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: ...lay LED flickers but Speaker is silent 22 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 TP15 signal generation Rotate disc Tracking Servo On TEI TP14 Signal generation Spindle Servo On DMSO TP25 Signal generation Read TOC Are...

Page 4: ... and GND 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 21 54 54 A 1 A 1 ...

Page 5: ...H output at IC201 pin Is the 2V at IC201 pin Check the pattern from IC501 pin to IC201 pin Check IC501 Replace IC101 Check the PN301 and then replace the Sled Motor YES YES YES YES NO NO Replace IC201 NO NO 150 41 25 151 145 41 CH1 PIN150 FM0 CH2 PIN151 FMS0 CH1 TP4 CH2 TP5 CH3 TP6 CH4 TP7 Fig B 1 FM0 and FMS0 Signals Fig B 2 TP4 TP5 TP6 and TP7 Signals ...

Page 6: ...01 C102 and then replace IC101 Replace IC501 YES YES NO NO 4 160 11 Does the focus search signal appear at F0S0 TP9 Refer to Fig D 1 Is the 2V at IC201 pin Replace IC101 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: ... IC201 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 TP15 when the IC501 pin opened Refer to Fig E 1 YES YES YES NO NO Replace IC501 Replace IC501 Replace Pick Up NO Do the signal appear at TP15 FEO Refer to Fig E 2 Does the signal appear at F TP10 during focus search E Disc doesn t rotate 166 ...

Page 9: ...28 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: ... YES Is TOC area on the disc read Does LED flicker Does the other disc operate normally Normal Disc is defective YES YES NO 10 NO Does RFAC signal TP16 appear Is Spindle Servo ON Does DMS0 signal TP25 appear YES YES NO NO NO Does PDA signal appear at IC101 pin 43 Replace IC101 Replace IC101 Replace IC501 Replace Main Circuit Board or MD Ass y NO Refer to C The Laser of Pick Up doesn t light F TOC ...

Page 11: ... 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 2 5V 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: ... 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 IC101 and then are transmitted to One Chip IC IC501 to generate the Servo Control Signal and Data Signal Red laser Pick Up module Tracking Focusing B C E F D A ...

Page 15: ...atic Laser Power Control Central Servo Control Focusing Error Signal Generator SBAD Sub Beam Adder REF and 2VREF Voltage Generator Power Down Control Power Down Tracking Error Signal Generator MUX IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION IC101 MT1136AE RF Amplifier IC I V converts and amplifies the signal received from the pick up and then applies to DSP part of one chip IC IC501 Block Diagra...

Page 16: ...nalog Input Positive input of focusing error amplifier 23 FEN Analog Input Negative input of focusing error amplifier 24 TEST Test pin No connect 25 TEST Test pin No connect 26 TEST Test pin No connect 27 FEO Analog Output Focusing error output 28 VREFO Analog Output A reference voltage output Typical value is 2 0v 29 CKIN Input 10KHz clock input for TEO FEO SBAD offset adjustment 30 VCC power Pos...

Page 17: ... 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 20 HU HU sensor amp inpu...

Page 18: ...CLOSE TROPEN TRAYOUT_ TRAYIN_ DGND IPLLVSS IPLLVDD HRST_ DD7 DDS DD6 DVDD DD9 DD5 DD10 DD4 DD11 DD3 DD12 DGND DD2 DD13 DD1 DD14 DD0 DD15 DMARQ_ DIOW_ DIOR_ IORDY DMACK_ INTRQ IOCS16_ DVDD DA1 PDIAG_ DA0 DA2 DGND CSIFX_ CS3FX_ DASP_ DEVSEL VPVSS VCOCIN VPVDD DACVDD LO DACVREF RO DACVSS ADGO VIO0 DGND Data Slicer and Data PLL RFRP Circuit Servo ADC Servo DSP PDM PWM DAC Reset Circuitry Host Data FIF...

Page 19: ...ogrammable bi directional I O Alternate function A 15 8 Upper address bus input output WR_ Data write signal The pin is dedicated for WR_ function and the programmable I O function is removed Programmable store enable output active low PSEN_ enables the external ROM output port Alternate function Programmable output Ground pin for internal digital circuitry Address latch enable output active high ...

Page 20: ...riting the lower bytes of a two WE_16 bit DRAM Row Address Strobe This output is the Row Address Strobe signal to the buffer DRAM Power pin for internal digital circuitry Buffer RAM Address These pins are the address bus to the external buffer DRAM Ground pin for internal digital circuitry Digital Audio Output Versatile I O 0 The signal is either the Digital Audio Output which supplies the IEC 958...

Page 21: ...e MT1198 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 MT1198 to indicate to the host that it is ready to receive data or DSTROBE Device Ultra DMA Data Strobe whose rising edge and falling edge latch the data from DD0 DD15 into the ...

Page 22: ...indicates the tray is in Feedback flag from tray connector Tray_is_out input A logical low indicates the tray is out Feedback flag from tray connector Tray open output Controlled by µP Tray close output Controlled by µP Sledge inner limit input active low Power pin for internal digital circuitry Ground pin for internal digital circuitry Motor Hall sensor input Laser diode control A logical high en...

Page 23: ... error input RF ripple detect output RF ripple slice level output High frequency RF ripple zero crossing RF ripple bias adjustment input RF ripple input RF signal input Ground pin for ADC circuitry RF data slicer level output Analog slicer current output Power pin for ADC circuitry FMO2 ENDM DMO TEBC RFGC PWMVREF PWM2VREF PDMVSS TRO FOO PDMVDD SBAD TEZILP TEZI TEI FEI RFRO RFRPSLV HRFZC RFBIAS RFI...

Page 24: ...ASH MEMORY RF Amp 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 32 BLOCK DIAGRAM MODEL CRD 8483B ...

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