HP 8559A Operation And Service Manual page 132

ADJUSTMENTS
5-21. BANDWIDTH FILTER ADJUSTMENTS (Cont'd)
LC Alignment
Accidentally shorting the case of A9Q1 (directly below A9TP6) to ANY test
point will cause catastrophic failure to Sweep Generator Assembly A9.
24. Set RESOLUTION BW control to 100 kHz. Jumper A9TP6 to A9TP8. This forces the BW7 line to
+
When Bandwidth Filter Assemblies A l l 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.
25. Perform preliminary LC filter adjustments
It might be necessary to adjust the REF LEVEL FINE control to obtain an on-
screen display during the following adjustments.
Remove A! 3 cover and install A13 on extender board.
Short to ground the following test points: A13TP6, A1 1TP3, and A11TP6. (This widens a l l but one
LC pole).
Center signal on CRT with TUNING control. Adjust A13C73 for minimum signal amplitude.
Disconnect short from A13TP6 and short to ground A13TP3.
Adjust A13C74 for minimum signal amplitude. Remove shorts from A13TP3, A1 lTP3, and
Reinstall A13 and cover. Short A13TP3 and A13TP6 to ground. Remove A1 1 cover and install A l l
Short A1 1TP6 to ground.
Adjust A1 1C73 for minimum signal amplitude.
Disconnect short from A1 1TP6 and short to ground A1 lTP3.
Adjust A1 1C74 for minimum signal amplitude.
Disconnect shorts from test points and reinstall A1 1 and cover. Leave jumper from A9TP6 to A9TP8
in place.
ADJUSTMENTS
NOTE
as
follows:
NOTE
MODEL 8559A