LG Electronics GSA-4168B, GSA-4165B, GSA-4167B service manual Writing Pulse Wave Form of DVD+R, 2Tw

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4. Writing Pulse Wave Form of DVD+R

For different speed ranges, different write strategies can be used. This document specifies 2 options:

-a pulsed write strategy, where each single mark is created by a number of subsequent separated short pulses.

-a blocked write strategy, where each single mark is created by one continuous pulse.

1) 1st Method : Using Pulsed Write Strategy

	* 3T :
		T = 3
	NRZI	2Tw
	Channel bits	2Tw
	Channel bits
		Ttop
		dTtop
	Pp	dTle
	Pb

N = 3 : only the top pulse(Ttop ), first pulse lead-time dT top , dTle

* > 4T :
		T > 4
NRZI	2Tw		Tw
Channel bits	2Tw		Tw
Channel bits
	Ttop	Tmp	Tmp	Tlp
	dTtop		Tmp
	dTtop
Pp	dTle
Pb

N > 4 : the top pulse (Ttop ), multi-pulse (Tmp ) and last pulse (Tlp ), first pulse lead-time dTtop, dTle

Pp : Actual write power

Pb : Bias Power

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Contents Model GSA-4165B/GSA-4167B/GSA-4168B Super Multi DVD DriveTable of Contents 4167B Support feature and writable discIntroduction 4165BSupported write method FeaturesGeneral Supported disc formatsAudio PerformanceWriting method SpecificationsOperating System Recording tool Applicable disc formatsRPC Regional Playback Control Phase2, No Region Data capacityRead/Write & Rotational speed CLV Access time 1/3 strokeData transfer rate PcavDimensions Quality and ReliabilityAcoustic noise Stop/Eject button Drive activity indicatorLocation of Customer Controls Disc tray Emergency Eject HolePower Connector Jumper Connector IDE Interface ConnectorAnalog Audio Output Connector Cabinet and Circuit Board Disassembly DisassemblyPick-up Exploded View Glossary ~0.5 um Disc SpecificationRecording Layer CD-R and CD-RW DiscPigment Reflective Layer Color Disc MaterialsCD-ROM disc CD-R discItop Laser Spot Position Time CD-RW DiscAmorphous Crystal phaseWriting Process of CD-R Disc Writing process of CD-RW DiscOrganization of the PCA, PMA and Lead-in Area Layout of CD-ROM discLayout of CD-R/RW disc OPC and Ropc Function of PCA and PMA areaRecording Capacity of CD-R/RW 74Minute Recording media Writing Process of DiscPCA Test Area Lead-In Area PCA C ount Area Lead -out AreaDifferences of DVD-R/RW, DVD+R/RW discs and DVD-ROM Single Layer Dual LayerDVD-ROM DVD-RW DVD+R DVD+RW Laser beam Recording format using organic dye material DVD-R/DVD+RDisc structure DVD-R DVD+RHigh reflection coefficient Low reflection coefficient Recording principlesDVD-RW DVD+RW Crystalline status Amorphous status2Tw Writing Pulse Wave Form of DVD+RShall be 0.1mW 2st Method Using Blocked Write StrategyWriting Pulse Wave Form of DVD+RW TtopDTera Layout of DVD-ROM disc Layout of DVD+R discOUT PSN Layout of DVD+RW disc LightScribe Media LightScribe MediaEncoder PowerCIrcuit ProcessorOptical Encoder Unit MD Assy For LightScribeOFG Optical Encoder AssyCodewheel GNDDVD CD Data ProcessingData Processing Flow Regional Code for DVD Disc Block Diagram R8J32007Copy Protection and Regional Code Management Block KEY Management Control Brief ProcessAbout Prevention the DVD-ROM from to be copy Case of a disc enhanced movie of 3 titlesIf you want to play the disc prevented from the copy Regional code About the DVD-ROM Regional CodeInternal Structure of the PICK-UP Block Diagram of the PICK-UPHOP-7632TSPick up Pin Assignment Signal Name Signal Description+D B+C kF+H E+G Signal detection of the P/UFocus Error Signal == A+C-B+D RF Signal == A+B+C+DPick-up Block DiagramAlpc Automatic Laser Power Control Circuit Focus Servo Focus CircuitTracking & Sled Circuit Block Diagram Tracking FollowingBlock Diagram Seek UnitHOP-7632TS Sled Servo Tracking ServoSpindle Circuit FG CAV ServoOptical Pick-up Disc HOP-7632TS Motor unit Block Diagram Wobble CLV Servo Pin Assignment IC101 R2S35002 RF AMP Analog Signal ProcessorPick Pin Functions Pin Name Pin No TypeFunction IP1/LPPOUT BlankWobsig IP2/MIRRPin Name Pin No Type Max. voltage Function Pin Layout IC301 R8J32007FPV Encoder, Decoder & DSP Singal ProcessorVinp ADC Pin no Pin Name Pin TableWpll Pin List Pin Name Pin No Destination Function Data PLL/PRML Pin List Pin Name Pin No Destination FunctionServo Pin List Pin Name Pin No Destination Function 5IO Atapi Hrstb AtapiDA2 Atapi DA1 DA0Lowzb IP1LPPINIP2MIRR WobsigH8S Micro-Processor Pin List Pin Name Pin No Destination FunctionFlash/SRAM Pin List Pin Name Pin No Destination Function SEL30 Power Supply/GND Pin List Pin Name Pin No Function Package outline 42 PIN Power Ssop 42P9R-K Pin FunctionPin name Function Loading Spgs ACTFLG,FG Actrst Common Input/Output circuit diagramCircuit Offset Adjust Troubleshooting GuideLaser Power Adjust using RD Power/WR Power/Erase Power High Frequency/NRZI skew AdjustFocus Amp. and Total Amp. Adjust Tracking Amp. AdjustServo Loop Gain Adjust Focus Offset Adjust for DVD-RAM Data Error pulse Unwritten Slice Level Adjust for DVD-RAMFocus Offset Adjust for DVD-ROM, CD-R/RW Focus Offset Adjust for DVD-RAM PID AmpFocus Offset Adjust for DVD-R/RW, DVD+R/RW, CD-R/RW Tilt Adjust for DVD-RAMTilt Adjust for DVD-R/RW, DVD+R/RW, CD-R/RW Focus Deviation AdjustFocus Offset Adjust for DVD-R/RW, DVD+R/RWDID Lens Sensitivity AdjustSpindle Offset Adjust Adip BPF/Read Timing Adjust for DVD+R/RWRTZ TimeOut Fail Focus Servo/Tracking Servo FailSlider Spindle SSB Byte8,9 Detail Error Code & Fail Analysis Laser Power Initial AdjustSSB Byte21,22 Adjusting Error during Disc Load Sequence Lead in ErrorDVD-R/RW, +R/RW DVD-ROM,CD-R/RWSSB Byte21,22 SSB Byte21,22 Loading Sequence Error Lead in Error 8586 PCB Poor Analysis Check list XRDDSP Page Is the clock of MPU in DSP oscillated correctly? Does the power supply circuit operate normally?CS0B WCK RCKMotor & actuator and its correspondence pin Control mode setup by the control terminalMotor, Abnormalities in Actuator System IC601R2S30202FP 7ch driverDVD/CD DSP Block DiagramMBM29LV160BE Fujitsu

GSA-4167B, GSA-4165B, GSA-4168B specifications

LG Electronics has been a prominent name in the electronics industry, particularly known for its innovative optical storage solutions. Among its noteworthy products are the GSA-4167B, GSA-4165B, and GSA-4168B DVD writers, each showcasing a blend of advanced technology and user-friendly features tailored to meet diverse consumer needs.

The LG GSA-4167B stands out for its versatility and performance. This model supports a wide range of disc formats, including DVD-R, DVD+R, DVD-RW, DVD+RW, and dual-layer DVDs, enhancing its usability for various applications. With a generous writing speed of up to 16x for DVD+R and 8x for dual-layer DVDs, users can create and backup data efficiently. This device is equipped with LG’s Super Multi technology which allows it to read and write multiple formats, making it a perfect choice for users who wish to maximize their media experience without being restricted to a single format.

The GSA-4165B, though slightly older, remains popular due to its reliable performance and ease of use. This model also supports a wide array of formats and achieves impressive speeds comparable to its counterparts. With features such as Buffer Under Run Technology, the GSA-4165B minimizes interruptions during the burning process, reducing the risk of damaging data. Additionally, its sleek design makes it appealing for desktop setups, offering both aesthetics and practicality.

On the other hand, the LG GSA-4168B is known for its advanced capabilities, particularly in terms of burning dual-layer DVDs. Supporting speeds up to 16x for standard DVDs and 4x for dual-layer formats, it combines speed with efficiency. This model incorporates LightScribe technology, enabling users to etch labels directly onto specially coated discs, adding a personal touch to data storage. Its efficient cooling system helps maintain performance during extensive usage, ensuring longevity and reliability.

All three models represent LG's commitment to quality and innovation in optical storage technology. With features such as Power Burn technology and Seamless Link, they provide users peace of mind during high-speed data transfers. Their compatibility with different operating systems further enhances their versatility, making them suitable for both home users and professionals. Overall, the GSA-4167B, GSA-4165B, and GSA-4168B are exemplary models that reflect LG Electronics' dedication to advancing technology and enhancing user experience in the realm of optical drives.