Instruction manual

Checks and Adjustments
5-24
1720/1721
b. Hold the REF switch in until the TEST indicator lights.
c. Set the front-panel GAIN CAL to midrange.
d. Position the center dot directly under the graticule center mark (+).
e. Adjust C453 (Quad Phase) and R453 (+V Bal) for the best overlay of
the test circles.
13. Adju st R--Y and B--Y Gains
a. Check to see that the center dot is directly under the graticule center
mark (+).
b. Adjust R460 (R--Y Gain) to place the outer circle directly over the RED
and CYAN (R and CY) targets.
c. Adjust R655 (B--Y Gain) to place the inner bright circle directly through
the BLUE and YELLOW (B and Y) targets.
14. Adju st 100% Gain
a. Select 100% Amplitude Color Bars from the Television Test Signal
Generator.
b. Push the 1720/1721 100% BARS button.
c. Adjust R178 (100% Gain) s o that the test circle passes through the
center of the RED and CYAN tar gets.