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Adjustment Procedures
1780R-Series Service Manual
5–31
Figure 5–15: Test equipment connections for adjusting CH A frequency response
t. Adjust A2C527 for 100 IRE (700 mV for PAL) signal amplitude on the
Waveform CRT.
u. Recheck the amplitudes at 3.58 MHz (4.43 MHz for PAL) and 5 MHz.
Readjust A2C611 and A2C527 if necessary.
v. Set the generator frequency to 10 MHz and the proper amplitude as
noted in part p. of this step.
w. Adjust A2C418 for a 101 IRE (707 mV for PAL) signal amplitude as
displayed on the Waveform CRT.
NOTE. A2C418 is set for slightly higher amplitude to allow for thermal
variations in frequency response when the instrument cover is installed.
x. Set the generator frequency to 3.58 MHz (4.43 MHz for PAL). Set the
amplitude to obtain the same DMM reading as noted in part p. of this
step.
y. Readjust A2C611, if necessary, for 100 IRE (700 mV for PAL).