114 E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Unlevels
— If the voltages are bad, go to step 7.
b. If Option 540, measure the signal going into J3 and out of J2 on the
A27 40 GHz Doubler. If the loss is greater than 2.5 dBm, replace the
A27 40 GHz Doubler.
c. If Option 550 or 567, measure the signal going into J3 and out of J2
on the A27 40 GHz Doubler. If the loss is greater than 2.5 dBm,
replace the A36 Quadraplier.
d. If Option 532 or 544, measure the signal going into J1 and out of J2
on the A37 Upconverter. The loss should be less than 5 dBm. If the
loss is 5 dBm or greater, replace the A37 Upconverter.
9. Unleveled only between 20 GHz and 40 GHz or 44 GHz. If the unleveled
condition occurs between 20 GHz and 40 GHz, the problem is either with
the A27 40 GHz Doubler or the A25 Highband Coupler/Detector.
a. Checking the A25 Highband Coupler/Detector:
— Using a spectrum analyzer, check at the RF output signal
level to the level shown in the Maximum Leveled Power table.
The RF output level must be greater than the maximum
specified power level.
— If the maximum power level is not greater than the maximum
power level specified, troubleshoot the RF path starting with
the signals out of the A30 Modulation Filter to the A27
40 GHz Doubler.
— If Option 550 or 567, replace the A36 Quadraplier.
— If Option 532 or 544, replace the A37 Upconverter.
— If the signal is greater than the maximum specified power
level, replace the A25 Highband Coupler/Detector.
10.Unleveled from >3.2 GHz to the maximum frequency.
Option 540 – Using the RF path block diagram, check the output levels of
the A29 20 GHz Doubler, the A30 Modulation Filter, and the A27 40 GHz
Doubler.
Options 550 and 567 – Using the RF path block diagram, check the output
levels of the A29 20 GHz Doubler, the A30 Modulation Filter, and the A36
Quadraplier.
Option 532 and 544 – Using the RF path block diagram, check the output
levels of the A35 20 GHz IQ Modulator, the A27 40 GHz Doubler, and the
A37 Upconverter.
11.Unleveled at all frequencies.
If the signal generator is unleveled at all frequencies, the problem is most
likely the A10 ALC.
a. Checking the A10 ALC:
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