HP 8562E, Service Manual

Page: 386 / 482

BNC CABLE
FREQUENCY COUNTER
TEST CABLE
A 10
Figure 1 l-4. Sampler and Sampling Oscillator Test Setup
25. At each combination, the frequency counter should measure a sampler IF as shown in
Table 11-5. (The sampling oscillator of the offset PLL tunes to the frequencies listed in
the table.) If the frequency counter does not read the indicated sampler IF
suspect the Al5 RF assembly.
26. Reconnect W34 to and W32 to
27. The First LO OUTPUT, located on the front panel, must be terminated in 50 ohms. If
the YTO unlocks only with certain center frequency and span combinations, check that
the termination is in place.
28. Set the spectrum analyzer and (SPAN) to generate the unlock conditions.
29. On the spectrum analyzer press
30. Move jumper to the TEST position.
31. Disconnect W34 from and measure the power of the signal at the end of W34.
32. If the power is less than -6.5 suspect W34, A7 SLODA, or All YTO.
33. Move jumper to the NORM position.
1 I-12 Synthesizer Section