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LG Electronics GSA-4165B, GSA-4168B, GSA-4167B 2 2st Method Using Blocked Write Strategy

Models: GSA-4167B GSA-4165B GSA-4168B

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2) 2st Method : Using Blocked Write Strategy

NRZI

2Tw

Channel bits

dTtop

Tlp

Ttop

Tmp

dPp
	dTle	1.25Tw
Pp	dTle
Pp
0mW	Pb	Pc
0mW

3T mark

dTtop,3

dTle Ttop,3

dTtop,4

dPp3 1.25Tw

Pb Pc

dPp4

1.25Tw 4T mark

Ttop,4 Tlp

5T mark

Etc.

1.25Tw

Ttop,4

Tmp Tlp

1.25Tw

Ttop,4

Tmp

Tmp Tlp

N = 3 : Ttop (cm = 3) can be optimized individually.

N >	4 : T	(cm > 4) + (N-3) x T	+ T	lp	,	T	w	= Tmp
	top	w		lp			w
Pc	shall be < 0.1mW

Pp : Actual write power

Pb : Bias Power

dPp : Additional power ( Only be applied for the 3T and 4T marks)

Pc : Cooling power (Especially at higher recording speeds, optimum cooling down of the recording layer after writing a mark may be needed.)

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LG Electronics GSA-4165B, GSA-4168B, GSA-4167B service manual 2 2st Method Using Blocked Write Strategy

Contents

P/NO 3828HS1047G August Printed in Korea SERVICE MANUALSuper Multi DVD Drive MODEL GSA-4165B GSA-4167B GSA-4168BTABLE OF CONTENTS CAUTION - INVISIBLE LASER RADIATION WHEN OPEN AVOID EXPOSURE TO BEAMINTRODUCTION 1. Support feature and writable discFEATURES 1 General2. Supported disc formats 3. Supported write method5. Audio 4. Performance1x CD = 150 kB/s SPECIFICATIONS Operating SystemRecording tool 2.1 Applicable disc formats2.5 RPC Regional Playback Control Phase2, No Region 3. DRIVE PERFORMANCE2.4 Data capacity 3.2 Read/Write & Rotational speed3.3 Data transfer rate 3.4 Access time 1/3 stroke2.77, 5.54 Mbytes/s 5. POWER REQUIREMENTS 8. Dimensions4. Quality and Reliability 6. AUDIO PERFORMANCELOCATION OF CUSTOMER CONTROLS Front Pane lDrive Activity Indicators Drive activity indicatorRear Pane l Analog Audio Output ConnectorIDE Interface Connector Jumper Connector Digital Audio Output ConnectorDISASSEMBLY 1. CABINET and CIRCUIT BOARD DISASSEMBLY2. MECHANISM ASSY DISASSEMBLY Emergency Eject Hole2-2. Pick-up EXPLODED VIEW PBM00 MAIN C.B.APBF00 FRONT C.B.A LightScribe onlyLogical Erase GLOSSARYMulti session 2. Disc Specification The differences of CD-R/CD-RW discs and General CD-ROM1. Recording Layer a=30nm3. Disc Materials 1 CD-ROM disc2 CD-R disc PigmentFocusing 4. Reading process of Optical DiscLens Groove6. Writing process of CD-RW Disc 5. Writing Process of CD-R DiscAmorphous 1 Layout of CD-ROM disc 7. Organization of the PCA, PMA and Lead-in Area2 Layout of CD-R/RW disc 1 PCA Power Calibration Area 1 OPC Optimum Power Control8. Function of PCA and PMA area 9. OPC and ROPC10. Writing Process of DISC The differences of DVD-R/RW, DVD+R/RW discs and DVD-ROM 0.4 umDVD-R/RW Disc LPP Land Pre-Pit DVD+R/RW Disc 1. Recording Layer2. Disc Specification 3. Disc Materials1 DVD-ROM Single LayerDisc structure 2 Recording format using organic dye material DVD-R/DVD+RDisc structure Recording principles Disc structureData erased state 4. Writing Pulse Wave Form of DVD+R NRZIN = 3 only the top pulseTtop , first pulse lead-time dT top , dTle NRZI2 2st Method Using Blocked Write Strategy 5. Writing Pulse Wave Form of DVD+RW NRZIChannel bits TtopDisc Center Diameter 120 mm1 Layout of DVD-ROM disc 2 Layout of DVD+R discDisc Center 3 Layout of DVD+RW discDiameter 120 mm DiscOD Label Zone Control Feature Zone Clamping/Logo Zone Center Hole LightScribe Media1. LightScribe Media Screen Printed Imaging Layer Clear Protective Coating2. Hardware Block Diagram Label PrintingLaser Power Reference Write Strategy Control SERVO SignalsOptical Encoder Unit 3. MD Assy For LightScribeOPU ID Movement Range L=21um Schematic of Enc PCB 4. Optical Encoder AssyEncoder PCB Optical Encoder IC FFC 3PINData Processing Flow CD DATA PROCESSINGP-up Unit HOP-7632TS 2. Copy Protection and Regional Code Management Block Block DiagramR8J32007 HOST DVD PLAYER EMPEG2 B/DIn case of a disc enhanced movie of 3 titles 3. About Prevention the DVD-ROM from to be copyIf you want to play the disc prevented from the copy Regional code 4. About the DVD-ROM Regional CodeExample The disc manufactured in the U.S.A, has the number one 1. Block Diagram of the PICK-UPHOP-7632TS INTERNAL STRUCTURE OF THE PICK-UPSignal Name 2. Pick up Pin AssignmentSignal Description 3. Signal detection of the P/U Track CenterTp/2 MainCIRCUITDESCRIPTION OF 1. ALPC Automatic Laser Power Control Circuit IC301 R8J32007CN101 IC101 R2S350021-2. ALPC Automatic Laser Power Control Circuit 2. Focus Circuit IC101R2S35002 Disc3. Tracking & Sled Circuit IC101R2S35002 DiscIC101 R2S35002Disc Optical3-2-1. Tracking Servo 3-2-2. Sled Servo4. Spindle Circuit 4-1-1. Block DiagramFGCAV ServoOptical Pick-up4-2-1. Block Diagram Wobble CLV Servo 4-2-2. Wobble CLV Servo CD-R 4x, 8x, 16x, 24x, 32xCD-RW 4x, 10x, 16x, 24x DVD-R 2x, 4x, 8x, 16xPCAV DVD-R DL 2x DVD-RW 1x, 2x, 4x DVD+R 2.4x, 4x, 8x, 12x, 16xPCAVIC101 R2S35002 RF AMP Analog Signal Processor MAJOR IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTIONR2S35002 TOP VIEWPick BALANCEPin Functions pin Namepin No TypeEqualizer fc auto-adjustment control clock input terminal pin Namepin No Typepin Name pin NoType max. voltageTop View IC301 R8J32007FPV Encoder, Decoder & DSP Singal ProcessorR8J32007 Demodulate 1.2 Block DiagramDescramble 1.3 Pin Table Pin noPin Name Pin noData PLL/PRML Pin List Pin NamePin No destinationServo Pin List Pin NamePin No destinationATAPI Interface Pin List Pin NamePin No destinationEncoder Interface Pin List Pin NamePin No destinationAudio Interface Pin List Pin NamePin No destinationLSI/TEST Control Pin List Pin NamePin No destinationPower Supply/GND Pin List Pin NamePin No FunctionPackage outline 42 PIN POWER SSOP 42P9R-K IC601 R2S30202FP SPINDLE MOTOR AND 6CH ACTUATOR DRIVERR2S3 0202FP Page Input/Output circuit diagram TROUBLESHOOTING GUIDE 01 Laser Power Adjust using RD Power/WR Power/Erase Power02 High Frequency/NRZI skew Adjust 03 Data Slice/Equalizer Boost/Raw Slice/ Equalizer Frequency Adjust07 Tracking Amp. Adjust 06 Focus Amp. and Total Amp. Adjust08 Servo Loop Gain Adjust 09 Unwritten Slice Level Adjust for DVD-RAM 10 Focus Offset Adjust for DVD-ROM, CD-R/RW11 Focus Offset Adjust for DVD-RAM PID Amp 12 Focus Offset Adjust for DVD-RAM Data Error pulse13 Tilt Adjust for DVD-RAM 14 Tilt Adjust for DVD-R/RW, DVD+R/RW, CD-R/RW15 Focus Deviation Adjust 16 Focus Offset Adjust for DVD-R/RW, DVD+R/RW, CD-R/RW17 Lens Sensitivity Adjust 18 Spindle Offset Adjust19 ADIP BPF/Read Timing Adjust for DVD+R/RW 20 Focus Offset Adjust for DVD-R/RW, DVD+R/RWDID21 RTZ TimeOut Fail 22 Focus Servo/Tracking Servo FailAll Disc Slider#6,8-10Detail Error Code & Fail Analysis 1. Laser Power Initial Adjust SSB Byte8,92. Adjusting Error during Disc Load Sequence Lead in Error SSB Byte21,22SSB Byte21,22 SSB Byte21,22 SSB Byte21,22 3. Loading Sequence Error Lead in Error SSB Byte21,22JR6 Power Supply System Diagram 5V in SW702SW701 IC701PCB Poor Analysis - Check list HW Self- Diagnostic function 1. Self-Diagnostic Function by LED Blink 3 Is the clock of MPU in DSP oscillated correctly? 2 Does the power supply circuit operate normally?4 The defect of Flash-ROM A control mode setup by the control terminal 3. Motor, Abnormalities in Actuator System1 IC601R2S30202FP 7ch driver A motor & actuator and its correspondence pinBLOCK DIAGRAM Host IDE12V GND 5V OPUHOP-7632TS HITACHI ME