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Adjustment Procedures
2715 Spectrum Analyzer Service Manual
5-41
7. Adjust R640 on the Sweep board (Figure 5--15) to move the bottom of the
scan to the bottom graticule line.
R640
R740
J750
C781
R290
R280
TP8
J480
Figure 5- 15: Adjustm ent and Test Point Locations on the Sweep Board
8. Adjust the FM detector as follows:
a. Select the following settings on the test Spectrum Analyzer:
FREQUENCY 100 MHz
REF LEVEL --30 dBm
SPAN/DIV 10 MHz
b. Enable the calibrator by pressing INPUT 9.
c. Center the signal by pressing CTR MEAS/TRKG.
d. Disconnect the 110 MHz IF cable from J750 on the Sweep board.
e. Monitor TP8 with a Multimeter and adjust R740 (FM Video Offset) on
the Sweep board (Figure 5--15) for 0.7 VDC.
f. Reconnect the 110 MHz IF cable to J750 on the Sweep board.
g. Set the oscilloscope to 0.5 V/Div and 1 ms/Div sweep.