HP 8566B Adjustment Manual page 285

If the power level of the displayed fundamental below 20 MHz is too
low, decrease the value of factory-select component AllA5C22. If
the power level of the displayed fundamental between 20 MHz and
30 MHz is too low, decrease the value of factory-select component
30 MHz is too high, increase the value of factory-select component
for AllA5C22, AllA5R22, AllA5L10, and to 'Ihble 3-4 for HP part
numbers. See Figure 3-73 for the location of AllA5C22, AllA5R22,
and Al lA5LlO.
52. Set the Spectrum Analyzer (DUT) LINE switch to STANDBY.
Disconnect the second spectrum analyzer from the RF Section
AllJ5 IF OUT. Disconnect the synthesized sweeper from the RF
Section AllJ2 M/N IN.
53. Replace the cover on AllA YTO Loop Sampler Assembly. Loosen
the Servicing Support Screw holding the All YTO Loop Assembly
in the Service Position. Grasp the two metal extractors on the
All YTO Loop Assembly and slide the assembly back into the RF
Section, mating the two guide pins with the corresponding guide
sleeves on the A23 Motherboard Assembly. Replace the three
screws (marked with the letter A) securing the All YTO Loop
Assembly in the RF Section.
54. Reconnect cable 8 (gray) to Al 1Jl PHASE DET OUT, cable 93
(white/orange) to Al 152 M/N IN, and the cable 5 (green) to Al 153
IF OUT.
55. Remove the SMA 50 ohm termination from the YTO OUT
connector of AllAl CIA Assembly. Install the termination on the
RF Section front-panel 1ST LO OUTPUT connector.
56. Reconnect semi-rigid coax cable W 11 to the YTO OUT connector
of AllAl CIA Assembly. Reconnect the opposite end of Wll to
AT2 (for RF Sections 2526A and below, Wll connects to cable
57. Remove the jumper from between A21TP2 and ground. Remove
the jumper between A12TP2 and A12TP3 (LOCK INDICATOR
DISABLE).
58. Replace the RF Section's bottom cover.
16. YTO Loop Adjustments
Adjustments 3-145