LG Electronics GSA-4167B, GSA-4168B, GSA-4165B Alpc Automatic Laser Power Control Circuit

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1-2. ALPC (Automatic Laser Power Control) Circuit

ALPC function DVD/CD anlaog front-end IC(IC101 R2S35002) is for constant power control purpose. Based on the accurate power sensor(FMON) in P/U, ALPC feedback loop maintains constant power level against laser diode’s temperature variation.

The ALPC loop amplifies(10x) the FMON signal to enhance the accuracy of read power level control. Swithching of amplification is made by combination of a logical WGATE signal and a logical RWAPC signal.

There are two set of APCDAC, which are used at different term to monitor different power level. Generally, the one is used at reading and the other one is used at writing. The logical WGATE signal which is switched between reading and writing changes the two APCDAC.

The ALPC loop supplies same currency (IAPC) to Laser Diode Driver(LDD) during reading and writing.

There is another ALPC which controls Full-Scale-DAC (FsDAC). FsDAC determines scale of WDAC of Laser Diode Driver. MPU monitors write-power level of FMON signal and changes FsDAC directly to maintain constant write-power level. There are two write power signal. The one is based on S/H signal and the other one is based on B/H(Bottom-Hold) signal. The write power levels are monitored as digital levlels which are converted by built-in Anlog-Digital Converter in DSP. The MPU monitors each write power level and calculates proper setting of FsDAC, and changes value through serial interface between LDD and DSP.

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Contents Super Multi DVD Drive Model GSA-4165B/GSA-4167B/GSA-4168BTable of Contents Support feature and writable disc Introduction4165B 4167BFeatures GeneralSupported disc formats Supported write methodPerformance AudioSpecifications Operating System Recording toolApplicable disc formats Writing methodRead/Write & Rotational speed RPC Regional Playback Control Phase2, No RegionData capacity Access time 1/3 stroke Data transfer ratePcav CLVAcoustic noise DimensionsQuality and Reliability Drive activity indicator Location of Customer ControlsDisc tray Emergency Eject Hole Stop/Eject buttonAnalog Audio Output Connector Power Connector Jumper ConnectorIDE Interface Connector Disassembly Cabinet and Circuit Board DisassemblyPick-up Exploded View Glossary Disc Specification Recording LayerCD-R and CD-RW Disc ~0.5 umDisc Materials CD-ROM discCD-R disc Pigment Reflective Layer ColorCD-RW Disc Itop Laser Spot Position TimeCrystal phase Writing Process of CD-R DiscWriting process of CD-RW Disc AmorphousLayout of CD-R/RW disc Organization of the PCA, PMA and Lead-in AreaLayout of CD-ROM disc Function of PCA and PMA area OPC and RopcWriting Process of Disc PCA Test Area Lead-In AreaPCA C ount Area Lead -out Area Recording Capacity of CD-R/RW 74Minute Recording mediaDifferences of DVD-R/RW, DVD+R/RW discs and DVD-ROM DVD-ROM DVD-RW DVD+R DVD+RW Single LayerDual Layer Recording format using organic dye material DVD-R/DVD+R Disc structureDVD-R DVD+R Laser beamRecording principles DVD-RW DVD+RWCrystalline status Amorphous status High reflection coefficient Low reflection coefficientWriting Pulse Wave Form of DVD+R 2Tw2st Method Using Blocked Write Strategy Shall be 0.1mWDTera Writing Pulse Wave Form of DVD+RWTtop OUT PSN Layout of DVD-ROM discLayout of DVD+R disc Layout of DVD+RW disc LightScribe Media LightScribe MediaPower CIrcuitProcessor EncoderMD Assy For LightScribe Optical Encoder UnitOptical Encoder Assy CodewheelGND OFGData Processing Flow DVDCD Data Processing Block Diagram R8J32007 Copy Protection and Regional Code Management BlockKEY Management Control Brief Process Regional Code for DVD DiscIf you want to play the disc prevented from the copy About Prevention the DVD-ROM from to be copyCase of a disc enhanced movie of 3 titles About the DVD-ROM Regional Code Regional codeBlock Diagram of the PICK-UPHOP-7632TS Internal Structure of the PICK-UPSignal Name Signal Description Pick up Pin AssignmentSignal detection of the P/U Focus Error Signal == A+C-B+DRF Signal == A+B+C+D +D B+C kF+H E+GBlock Diagram Pick-upAlpc Automatic Laser Power Control Circuit Focus Circuit Focus ServoBlock Diagram Tracking Following Tracking & Sled CircuitHOP-7632TS Block Diagram SeekUnit Tracking Servo Sled ServoOptical Pick-up Disc HOP-7632TS Motor unit Spindle CircuitFG CAV Servo Block Diagram Wobble CLV Servo IC101 R2S35002 RF AMP Analog Signal Processor Pin AssignmentPick Function Pin FunctionsPin Name Pin No Type Blank WobsigIP2/MIRR IP1/LPPOUTPin Name Pin No Type Max. voltage Function IC301 R8J32007FPV Encoder, Decoder & DSP Singal Processor Pin LayoutVinp ADC Pin Table Pin no Pin NameData PLL/PRML Pin List Pin Name Pin No Destination Function Wpll Pin List Pin Name Pin No Destination FunctionServo Pin List Pin Name Pin No Destination Function Hrstb Atapi DA2 AtapiDA1 DA0 5IO AtapiIP1LPPIN IP2MIRRWobsig LowzbFlash/SRAM Pin List Pin Name Pin No Destination Function H8S Micro-Processor Pin ListPin Name Pin No Destination Function SEL30 Power Supply/GND Pin List Pin Name Pin No Function Pin name Function Package outline 42 PIN Power Ssop 42P9R-KPin Function Loading Input/Output circuit diagram Spgs ACTFLG,FG Actrst CommonTroubleshooting Guide Laser Power Adjust using RD Power/WR Power/Erase PowerHigh Frequency/NRZI skew Adjust Circuit Offset AdjustServo Loop Gain Adjust Focus Amp. and Total Amp. AdjustTracking Amp. Adjust Unwritten Slice Level Adjust for DVD-RAM Focus Offset Adjust for DVD-ROM, CD-R/RWFocus Offset Adjust for DVD-RAM PID Amp Focus Offset Adjust for DVD-RAM Data Error pulseTilt Adjust for DVD-RAM Tilt Adjust for DVD-R/RW, DVD+R/RW, CD-R/RWFocus Deviation Adjust Focus Offset Adjust for DVD-R/RW, DVD+R/RW, CD-R/RWLens Sensitivity Adjust Spindle Offset AdjustAdip BPF/Read Timing Adjust for DVD+R/RW Focus Offset Adjust for DVD-R/RW, DVD+R/RWDIDSlider Spindle RTZ TimeOut FailFocus Servo/Tracking Servo Fail Detail Error Code & Fail Analysis Laser Power Initial Adjust SSB Byte8,9Adjusting Error during Disc Load Sequence Lead in Error SSB Byte21,22DVD-ROM,CD-R/RW DVD-R/RW, +R/RWSSB Byte21,22 SSB Byte21,22 Loading Sequence Error Lead in Error 8586 DSP PCB Poor Analysis Check listXRD Page Does the power supply circuit operate normally? CS0BWCK RCK Is the clock of MPU in DSP oscillated correctly?Control mode setup by the control terminal Motor, Abnormalities in Actuator SystemIC601R2S30202FP 7ch driver Motor & actuator and its correspondence pinBlock Diagram MBM29LV160BEFujitsu DVD/CD DSP

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.
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