E8257D/67D, E8663D PSG Signal Generators Service Guide 69
Troubleshooting
Troubleshooting Assembly–Level Problems
— If all the signals at J1 are good, continue with Step 3.
2. If any signal measured in Step 1 is bad, check the signal out of the
A6 Frac–N output port on the A29 20 GHz Doubler.
— If the signal out the A29 20 GHz Doubler is good, replace the cable.
— If the signal out the A29 20 GHz Doubler is bad, replace the A29
20 GHz Doubler.
3. If all of the signals at J1 are good, turn the signal generator off and
reinstall the A6 Frac–N.
4. Check J4 at the A8 Output (shown on page 95):
a. Power the signal generator on and remove the A8 Output.
b. Use an extender cable to connect a spectrum analyzer to J4.
c. Tune the spectrum analyzer to the first frequency in column one of
Table 1-13, and check for approximately +10 dBm.
— If an RF signal is present on J4, replace the A8 Output.
— If an RF signal is not present on J4, replace the A6 Frac–N.
705 F/2 Test
1. Using an oscilloscope, check the 10 MHz Synthesis line on P33–15. The
signal period should be 100 ns with an amplitude of approximately 3V
pp
.
— If the signal is good, replace the A6 Frac–N.
2. If the signal is bad, turn the signal generator power off, remove the A6
Frac–N, and measure P33–15 again.
— If the signal is good, replace the A6 Frac–N.
3. 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.
Table 1-13
Center Frequency
(GHz)
J1 Frequency
(GHz)
Power at J1
(dBm)
0.300 4.771
> –6
0.500 7.969
0.750 5.971
1.25 4.976
2.0 7.969
3.0 5.971
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