JVC 330 Service Manual

Contents

Chapter 2—Functional Descriptions2-24 Model 330. 340SC, and 370SC Service Manual/Hx112 112 times the horizontal frequency for convergence and Z axiscorrection address generator clocking. (TP 20)/CORSTRT Signal used to start the convergence and overlay addressgenerators during each horizontal sweep. (TP 4)/FRAMEST Indicates the beginning of a frame. Used in the SCB forcounting vertical frequency. (TP 5)INTI Indicates when input source signal is interlaced. (TP 2)/VSYNCSC Regenerated vertical sync signal, pulse shaped to 3 horizontallines in width. (TP 7)/FIELD1 Low during field #1 of an interlaced input source. (TP 8)/MAPST Pulse signal to signal the overlay and correction addressgenerators to reset for a new frame. (TP 12)I/O DescriptionIICDATA IIC data line. Bi-directional serial line for synchronous datatransfer between SCB and other circuit boards. See detaileddescription for list of signals transferred and data direction.Video Processor BoardInputs DescriptionSGSYNC Stripped Green Sync is Sync-on-Green composite sync signal.(TP 10)HCSYNC Horizontal/Composite Sync. (TP 9)VSYNC Vertical Sync used only for separate H and V sync. (TP 21)Outputs DescriptionDCRSTR Pulse for DC restore timed to correspond to ST, BP, or TL.(TP 1)VIDBLNK Signal for image blanking from adjustment counters. (TP 6)/VSYNCSC Vertical sync signal pulse for ILA bias sync. (TP 7)Horizontal Deflection BoardInputs Description/HVFLBCK Signal representing horizontal flyback from the HDB. Used fordetermining H phase. (TP 17)Outputs Description/VFBST Signal to start the vertical retrace. (TP 11)/HSYNCRE Selected HSYNC signal. (TP 14)Vertical Deflection BoardOutputs Description/PCST Signal to time the start of T/B pincushion and linearitycorrection. (TP 31)