Agilent Technologies PSG Series Service Manual page 46

3. If the signal out the A29 20 GHz Doubler is bad, replace the A29 20 GHz Doubler.
4. If the signal at J1 is good, turn power off and reinstall the A6 Frac-N.
5. Power the signal generator on and remove the A8 Output. Use an extender cable to connect a spectrum
analyzer to J4. Tune the spectrum analyzer to the first frequency in column one of
and check for an approximate power of +10 dBm.
6. If an RF signal is present on J4, replace the A8 Output.
7. If an RF signal is not present on J4, replace the A6 Frac-N.
705 F/2 Test
1. Check 10 MHz Synthesis line on P33-15 using an oscilloscope. The signal period should be 100 ns with an
amplitude of approximately 3 V
2. If the signal is good, replace the A6 Frac-N.
3. If the signal is bad, turn the signal generator power off and remove the A6 Frac-N. Measure the P33-15
again.
4. If the signal is good, replace the A6 Frac-N, if the signal is still bad, measure P41-5 on the A7 Reference. If
the signal is good, at P41-5, replace the A31 Motherboard.
5. If the signal is bad on P41-5, replace the A7 Reference.
706 FM Path Test
1. While monitoring P31-22 (FM_On_H), loop self-test 706. Using an oscilloscope, check for a TTL transition
from 0 Vdc to +5 Vdc. If the signal is not present, refer to A5 Sampler troubleshooting.
2. If the signal in step (1) is present, check P31-11 (FM) and loop self-test 706. Using an oscilloscope, check
for a 0 Vdc to 3.3 Vdc transition. If the signal is not present, refer to A11 Pulse/Analog Modulation
Generator troubleshooting.
3. If the signals in step (2) are present, replace the A6 Frac-N.
.
p-p
Troubleshooting Assembly Level Problems
Table 1-23 on page 1-32
Troubleshooting
1-33