HP 8560A Service Manual page 373

22. Place jumper A14J23 in the NORMAL position and reconnect W34 to A15A2Jl.
23. Set the HP 8560A to the following settings:
CENTER FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300 MHz
SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz
24. Place jumper A14J23 in the TEST position.
25. Disconnect W32 from A15JlOl. Monitor the Sampler IF output (A15J101, SAMPLER
IF) with a synthesized spectrum analyzer such as an HP 8568A/B or HP 8566A/B.
26. The Sampler IF should measure between 74 MHz and 114 MHz at -15 dBm to +2 dBm.
If the signal frequency or amplitude is incorrect, refer to "Unlocked Offset PLL" in this
chapter.
27. Set jumper A14J23 in the NORMAL position. Reconnect W32 to A15JlOl.
Note
The All YTO has an initial pretune accuracy of f20 MHz. However,
when the Roller Oscillator frequency is <73 MHz, this is changed to
to +lO/-30 MHz. This is done by changing the Main Coil Coarse DAC to
keep the Sampler IF within the acquisition range of the YTO Loop. When
dealing with the Sampler IF and an unlocked YTO, the same frequency
differences apply to the Sampler IF.
28. Set the HP 8560A to the following settings:
CENTER FREQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300 MHz
SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OHz
29. Connect an RF signal-generator's output to A14J501. Set the signal generator to the
following settings:
Frequency
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...84 MHz
Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..OdBm
30. Monitor A14J17 pin 1 with a DVM or oscilloscope.
31. As the signal generator's frequency is increased to 104 MHz, the voltage at A14J17 pin 1
should change from f8.2 to -8.2 Vdc fl V.
32. Set the signal generator to the following settings and repeat step 23.
Frequency
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...84 MHz
Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -15 dBm
Synthesizer Section