Chapter 2—Functional Descriptions
/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) |
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I/O | Description |
IICDATA | IIC data line. |
| transfer between SCB and other circuit boards. See detailed |
| description for list of signals transferred and data direction. |
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| Video Processor Board |
Inputs | Description |
SGSYNC | Stripped Green Sync is |
| (TP 10) |
HCSYNC | Horizontal/Composite Sync. (TP 9) |
VSYNC | Vertical Sync used only for separate H and V sync. (TP 21) |
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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) |
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| Horizontal Deflection Board |
Inputs | Description |
/HVFLBCK | Signal representing horizontal flyback from the HDB. Used for |
| determining H phase. (TP 17) |
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Outputs | Description |
/VFBST | Signal to start the vertical retrace. (TP 11) |
/HSYNCRE | Selected HSYNC signal. (TP 14) |
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| Vertical Deflection Board |
Outputs | Description |
/PCST | Signal to time the start of T/B pincushion and linearity |
| correction. (TP 31) |
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Model 330. 340SC, and 370SC Service Manual |
