HP 8559A Operation And Service Manual page 198

5-21. BANDWIDTH FILTER ADJUSTMENTS (SERIAL PREFIX 1909A) (Cont'd)
16. Adjust A13C15 SYM and A13C25 CTR for a centered and symmetrical bandpass. Adjust A13C25
for minimum signal amplitude,
17. Remove crystal short from A1 lTP4/TPS..
18. Adjust A11C38 SYM and AllC54 CTR for a centered and symmetrical bandpass. Adjust AllC54 for
minimum signal amplitude.
19. Remove crystal short from A1 1TP 1/TP2.
20. Adjust AllC15 SYM and AllC25 CTR for a centered and symmetrical bandpass. Adjust AllC25 for
minimum signal amplitude.
21. Remove the crystal shorts.
LC Alignment
22. Perform preliminary LC filter adjustments as follows:
When Bandwidth Filter Assemblies A1 1 and A13 are installed with covers in
place, midget copper alligator clips (HP Part Number 1400-0483) can be used
to short test points to the cover.
a. Install A13 on extender board.
b. Short to ground the following test points: A13TP6, AllTP3, and AllTP6. Jumper A9TPl to
c. Adjust A13C73 lor minimum signal amplitude.
d. Disconnect short from A1 3TP6 and short to ground A1 3TP3.
e. Adjust A13C74 for minimum signal amplitude.
f. Reinstall A13 and install A1 1 on extender board.
g. Disconnect short from A13TP3 and short to ground A1 1TP6.
h. Adjust A1 1C73 for minimum signal amplitude.
i. Disconnect short from A1 1TP6 and short to ground A1 1TP3.
j. Adjust A1 1C74 for minimum signal amplitude.
k. Disconnect shorts from test points and reinstall A1 1. Replace covers on A1
Remove jumper from A9TP 1 /A9TP2.
ADJUSTMENTS
NOTE
and A13 assemblies.