Ch1 PrecautionsSafety Precautions .......................................1-1Servicing Precautions ..................................1-2Precautions for ElectrostaticallySensitive Device (ESDs ...............................1-3Special Precautions and WarningLables for Laser Products ............................1-4Special Precautions for HDD .......................1-5INDEXCh2 Product DescriptionFeatures . . . . . . . . . . . . . . . . . . . . . . . . . .2-1Specifications . . . . . . . . . . . . . . . . . . . . . .2-2Accessories . . . . . . . . . . . . . . . . . . . . . . .2-3Specification Comparison . . . . . . . . . . . . .2-4Ch3 Product FunctionsSPK connection ...........................................3-1Main Functions.............................................3-2New Functions .............................................3-3Ch4 AdjustmentsDVD flash Initialization & Update .................4-1Ch5 How to disassembleSeparate CABINET-TOP ..............................5-1Separate REAR-COVER..............................5-2Separate CHASSIS-BACK...........................5-3Separate PCB ..............................................5-5Ch6 TroubleShootingMain .............................................................6-1Output ..........................................................6-2In case of Power Protection .........................6-3AMP Pre-Inspection relating to Power Protection ..6-4Ch7 Exploded Views and Parts ListHT-X250 Exploded View ..............................7-1HT-X250 Parts List .......................................7-2Ch9 Block DiagramBlock ............................................................9-1Ch10 Wiring DiagramWiring Diagram ..........................................10-1GND ...........................................................10-2VDD............................................................10-3SMPS .........................................................10-4Ch11 PCB DiagramMAIN PCB..................................................11-1MAIN PCB Description ..............................11-2SMPS-PCB ................................................11-4Ch12 Schematic DiagramMAIN ..........................................................12-1KEY ............................................................12-9SMPS .......................................................12-10Ch13 Circuit Board DescriptionPCB Assy. Layout 1 (HT-X250/X200).........13-1Functional Description (SMPS) .............13-2Functional Description (Main,Front) ........13-4Functional Description (Amp)................13-4Ch14Definition of Home Theater ........................14-1Concept of Sound .............................14-2Home Theater Sound Format ...............14-3Home Theater Components .................14-4Ch8 Electrical Parts ListElectrical Parts Lis .......................................8-1