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Adjustment Procedures
1780R-Series Service Manual
5–39
k. Adjust the Precision Measurement control so that the CURSOR 1 and
CURSOR 2 dots are exactly 10 divisions apart (The bright-up dots
should coincide with the 2nd and 12th major graticule marks when the
DT readout is exactly 100.000 ms.)
NOTE. The dots may have to be set slightly short (1/8 to 1/4 of a minor division
so that the X5, X10, and X20 sweep timing will meet their performance
requirements.
l. Push the CALIBRATE button to exit the HORIZ CAL mode.
m. Set 1780R-Series MAGNIFIER for a readout of 0.40 ms/DIV.
n. Use the technique described in parts e. through i. to position CURSOR 1
and CURSOR 2 bright-up dots on the 2nd and 12th major graticule
marks. Then, slowly turn the Comparison Voltage control until the DT
readout is exactly 4.000 ms.
o. Adjust X25 Mag (A2R471) so that the CURSOR 1 and CURSOR 2 dots
are exactly 10 divisions apart while the DT readout is 4.000 ms.
p. Set 1780R-Series MAGNIFIER for a readout of 0.20 ms/DIV.
q. Use the technique described in parts e. through i. to position the dots
while maintaining a DT readout of exactly 2.000 ms.
r. Adjust X50 Mag (A2R474) so that the CURSOR 1 and CURSOR 2 dots
are exactly 10 divisions apart while the DT readout is 2.000 ms.
s. Set 1780R-Series MAGNIFIER for a readout of 0.10 ms/DIV.
t. Use the technique described in parts e. through i. to position the dots
while maintaining a DT readout of exactly 1.000 ms.
u. Adjust X100 Mag (A2R476) so that the CURSOR 1 and CURSOR 2
dots are exactly 10 divisions apart while the DT readout is 1.000 ms.
v. Set the TIME CURSORS and MAGNIFIER to OFF.
33. Adjust Horizontal Magnifier Registration
a. Connect the television test signal generator Color Bar signal through a
75 W feed-through terminator to the CH A INPUT. Check that the
generator Black Burst signal is connected to the EXT REF connector and
terminated into 75 W.
b. Set the 1780R-Series button selection to WFM HORIZONTAL-TWO-
FIELD sweep. Check that INPUT-CH A is selected.
c. Set the WFM HORIZONTAL-MAGNIFIER to ON and to X100.