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Installation
2–22
1780R-Series Service Manual
7. Touch <TRACE ROTATION> to obtain a test axis, then use the large knob
to adjust trace rotation on the Vectorscope CRT. Align the horizontal lines of
the electronic graticule parallel with the Vectorscope CRT graticule.
8. Touch <CAL OSC> until <ON> is outlined. While the cal oscillator is on,
the V axis switcher is enabled and 75% bars are selected (with 7.5% setup
for NTSC).
a. For 1780R (NTSC) only: Touch <GAIN 1 CAL (SETUP)> on the
Waveform CRT. See Figure 2–14. The large knob will now adjust
vectorscope gain. Use the large knob to match the circle to the compass
rose. Touch <GAIN 2 CAL (NO SETUP)>. Use the large knob to match
the circle to the compass rose. Touch <GAIN 1 CAL (SETUP)> to return
to this mode.
b. For 1781R (PAL) only: Touch <GAIN CAL> on the Waveform CRT.
See Figure 2–15. The large knob will now adjust vectorscope gain. Use
the large knob to match the circle to the compass rose.
9. Touch <CAL OSC> until <OFF> is outlined.
10. Push the front-panel PHASE SHIFT button to On. Turn the large knob to
properly position the burst and color vectors to their graticule marks on the
Vectorscope CRT. Press the PHASE SHIFT button to exit this mode.
a. For 1780R (NTSC) only: Check that <GAIN 1 CAL (SETUP)> is
selected. Verify that the color vector dots are in their boxes. Then, set the
NTSC generator Setup button to 0%. Select <GAIN 2 CAL (NO
SETUP)> and verify that the color vector dots are in their boxes. Set the
NTSC generator Setup button to 7.5%.
b. For 1781R (PAL) only: Check that <GAIN CAL> is selected. Verify that
the color vector dots are in their boxes.
11. Push the front-panel CALIBRATE button to exit the menu.