HP 8560A, Service Manual

Page: 350 / 450

BNC CABLE
F R E Q U E N C Y C O U N T E R
I ED
FREOUENCY
STANDARD
E X T
C A B L E
TEST CABLE
A
S K 1 1 0 2
Figure 10-2. Sampler and Sampling Oscillator Test Setup
24. At each combination, the frequency counter should measure a sampler IF of 100.2 MHz
Hz. (The Offset sampling oscillator tunes to the frequencies listed in the
table.) If the frequency counter does not read a sampler IF of 100.2 MHz, suspect the Al5
RF Assembly.
25. Reconnect W34 to and W32 to
26. If YTO unlocks only with certain center frequency and span combinations, terminate the
LO OUTPUT in 50 ohms.
27.
Set the HP
CENTER FREQ
and to generate the unlock conditions.
Set the HP trigger to
SINGLE.
29. Move jumper to the TEST position.
30. Disconnect W34 from and measure the power of the signal at the end of W34.
31. If the power is less than -6.5 suspect W34, A7 LODA, or All YTO.
32. Move jumper A14J23 to the NORM position.
Synthesizer Section