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Adjustment Procedures
1780R-Series Service Manual
5–51
Figure 5–19: Z-Axis circuit board (A4) adjustment and test point locations
e. Disconnect the probe from A4TP108.
f. Connect a 10X probe from the test oscilloscope vertical input to
A4TP100. Set the test oscilloscope vertical deflection factor to 2 V/ Div
and the sweep rate to 2 ms/Div.
g. Adjust Cursor Clock Centering (A4L115) for a DC level of +8 V at
ambient room temperature.
h. Disconnect the 10X probe from the test point.
i. Select CONFIGURE-On and PAGE 3. Touch the VERSION pad on the
Vectorscope CRT menu and then quickly press the TIME CURSORS
button. The Vectorscope CRT should display the following messages:
"INTERNAL TIMING CURSORS CAL"
"TOUCH HERE TO EXIT"
j. Turn the Precision Measurement control to place the cursors on the
rising edge of the white bar as displayed on the Waveform CRT.
k. Adjust Analog Delay (A4R110) so the timing cursors overlay each other
on the rising edge of the white bar.
l. Touch the indicated location on the Vectorscope CRT menu to exit this
mode. Press the CONFIGURE button to Off.
m. Disconnect the Color Bar signal.
40. Adjust Chrominance/Luminance