Last Converter Adjustments Setup - HP 8566B Adjustment Manual

20. Last Converter Adjustments
3-170 Adjustments
Figure 3-87. Last Converter Adjustments Setup
4. Remove the RF Section right side cover (now on the left), and
remove the two screws attaching the A6A3 Last Converter
Assembly to the RF Section chassis.
5. Disconnect cable 1 (brown) from A6A3Jl 321.4 MHz IN, cable 2
(red) from A6A3J2 300 MHz IN, and cable 81 (gray/brown) from
Remove the A6A3 Last Converter Assembly from the RF Section.
6. Adjust the five variable capacitors A6A3AlC8, A6A3AlC9,
visible through five evenly-spaced, unlabeled access holes in the
bottom cover of the A6A3 Last Converter Assembly; position
each capacitor with its adjustment slot vertical and plates fully
meshed. Refer to Figure 3-88 for the location of A6A3AlC8,
7. Install the A6A3 Last Converter Assembly in the RF Section using
an extender board. Reconnect cable 2 (red) to ABA3J2 300 MHz
IN.
8. Reinstall the A6A9 Phase Lock Assembly, the A6AlO
Miscellaneous Bias/Relay Driver Assembly, the A6All Slope
Generator Assembly, and the A6A12 YTX Driver Assembly in the
RF Section.
9. Reconnect cable 2 (red) to A6A9Jl 300 MHz OUTPUT and cable 85
(gray/green) to A6A9J3 100 MHz INPUT.