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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)