JVC 340 SC - Manual (Page 36)

Chapter 2—Functional Descriptions
2-24 Model 330. 340SC, and 370SC Service Manual
/Hx112 112 times the horizontal frequency for convergence and Z axis
correction address generator clocking. (TP 20)
/CORSTRT Signal used to start the convergence and overlay address
generators during each horizontal sweep. (TP 4)
/FRAMEST Indicates the beginning of a frame. Used in the SCB for
counting vertical frequency. (TP 5)
INTI Indicates when input source signal is interlaced. (TP 2)
/VSYNCSC Regenerated vertical sync signal, pulse shaped to 3 horizontal
lines 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 address
generators to reset for a new frame. (TP 12)
I/O Description
IICDATA IIC data line. Bi-directional serial line for synchronous data
transfer between SCB and other circuit boards. See detailed
description for list of signals transferred and data direction.
Video Processor Board
Inputs Description
SGSYNC 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 Description
DCRSTR 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 Board
Inputs Description
/HVFLBCK Signal representing horizontal flyback from the HDB. Used for
determining H phase. (TP 17)
Outputs Description
/VFBST Signal to start the vertical retrace. (TP 11)
/HSYNCRE Selected HSYNC signal. (TP 14)
Vertical Deflection Board
Outputs Description
/PCST Signal to time the start of T/B pincushion and linearity
correction. (TP 31)