HP 8566B Adjustment Manual page 312

20. Last Converter Adjustments
3-172 Adjustments
15. Move the probe to the access hole above A6A3AlC8 (the
rightmost access hole). Adjust A6A3AlC9 (second access hole
from the right) to minimize the amplitude of the 321.4 MHz signal
displayed on the second spectrum analyzer.
16. With the probe still in
32 1.4 MHz signal displayed on the second spectrum analyzer.
17. Adjust A6A3AlCll (second access hole from the left) to minimize
the amplitude of the 321.4 MHz signal displayed on the second
spectrum analyzer.
18. Adjust A6A3AlC12 (left-most of
the amplitude of the 321.4 MHz signal displayed on the second
spectrum analyzer.
19. Remove the probe from the access hole above A6A3AlC8, and
disconnect the probe from the BNC to SMB snap-on test cable.
Use the BNC to SMB snap-on test cable to connect the RF INPUT
of the second spectrum analyzer to A6A3J3 (21.4 MHz OUT).
20. Set the spectrum analyzer controls as follows:
CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.7 MHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . .500 kHz
REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30 dBm
21. On the synthesized sweeper, key in
-40 dBm.
22. Locate the 10.7 MHz Notch Filter adjustment, visible through the
remaining unlabeled access hole near the center of the bottom
cover of the A6A3 Last Converter Assembly (refer to Figure 3-88).
Adjust A6A3AlC23 to minimize the amplitude of the 10.7 MHz
signal displayed on the second spectrum analyzer.
23. Set the RF Section LINE switch to STANDBY.
24. Disconnect the synthesized sweeper from A6A3Jl 321.4 MHz IN.
Disconnect the second spectrum analyzer from A6A3J3 (21.4 MHz
OUT).
Disconnect cable 2 (red) from A6A3J2 300 MHz IN.
25. Disconnect cable 2 (red) from A6A9Jl 300 MHz OUTPUT and
cable 85 (gray/green) from A6A9J3 100 MHz INPUT. Remove the
Driver Assembly, the A6All Slope Generator Assembly, and the
26. Reinstall the A6A3 Last Converter Assembly in the RF Section,
and replace the two screws attaching the A6A3 Last Converter
Assembly to the RF Section chassis. Replace
side cover.
27. Reconnect cable 1 (brown) to A6A3Jl 321.4 MHz IN, cable 2 (red)
to A6A3J2 300 MHz IN, and cable 81 (gray/brown) to A6A3J3
(21.4 MHz OUT) on the A6A3 Last Converter Assembly.
28. Reinstall the A6A9 Phase Lock Assembly, the A6AlO
Miscellaneous Bias/Relay Driver Assembly, the A6All Slope
the access hole above A6A3AlC8, adjust
the five access holes) to maximize
310.7 MHz,
the
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POWER LEVEL
RF Section right