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Adjustment Procedures
5–54
1780R-Series Service Manual
Figure 5–21: Properly adjusted xy input gains
42. Adjust RGB/YRGB
a. Connect a Color Bar signal from the television test signal generator,
through a 75 W feed-through terminator, to the 1780R-Series CH A
INPUT.
b. Check that a Black Burst signal is applied to the 1780R-Series EXT REF
connector and this connector is terminated into 75 W.
c. Select 1780R-Series RIGHT DISPLAY-WFM and REF-EXT. Check that
INPUT-CH A and WFM HORIZONTAL-ONE-LINE are selected.
d. Press the button below the Waveform CRT. Use the 1780R-Series
HORIZ POS and VERT POS controls to center the display on the
Waveform CRT.
e. Connect the RGB Parade Display Test Connector fixture (see Figure
5–5) to the 1780R-Series rear-panel REMOTE connector.
f. Note that the color bar display (or sweep) has shortened to 3.2 to 3.7
divisions when jumper A2J585 is set to its factory-set 4-Step YRGB
Parade position (pins 2 & 3 are jumpered).
g. Adjust RGB/YRGB Staircase Offset (A5R194) to horizontally position
the color bar waveform so that it ends at the last major division mark on
the right side of the Waveform CRT graticule baseline.