208 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
RF Assembly
A3 RF Assembly Troubleshooting
— Span = 10 MHz
— Reference Level = +10 dBm
9. Since A3 J2002 is before the output attenuator on the A7 Micro-Deck
assembly the output level at A3 J2002 should be equal to the ALC Level.
To find the ALC Level press AMPTD, Atten/ALC Control, Atten Hold On and
read the Set ALC Level listed on the fourth softkey.
10.The power level of the signal at A3 J2002 should be equal to the ALC Level
displayed, +/-3dB.
— If the power level measured is not equal to the ALC Level, +/-3 dBm,
the problems is with the A3 RF assembly. Proceed to step 11.
— If the power level measured is equal to the ALC Level, +/-3 dB, the
power level at the output of the RF Output section is correct. The
issue is somewhere farther down the signal path on the A7
Micro-Deck assembly. See Chapter 11, “Micro-Deck Assembly,” for
further troubleshooting.
11.Verify the power supply voltages by seeing the “Power Supply Status
Quick-Check” section in Chapter 8, “Power Supply”
12.Verify that the instrument is using the factory calibration data by restoring
the data. See “Calibration Data Restore” in Chapter 3, “Instrument
Information and Calibration Data”
13.Run the “RF Output Related Adjustments” listed later in this section.
14.If the failure persists, replace the A3 RF assembly.
Unlevel
If there are any ALC issues, see “Unleveled Issues” in Chapter 6,
“Troubleshooting”
Amplitude Modulation
If there are any amplitude modulation issues, see “Amplitude Modulation
Issues (Option UNT)” in Chapter 6, “Troubleshooting”
Pulse Modulation
If there are any pulse modulation issues, see “Pulse Modulation Issues (Option
UNW)” in Chapter 6, “Troubleshooting”
Self Tests
There is a series of Self Tests related directly to the RF Output section. They are
the 400 series tests. See Chapter 4, “Self Test,” for a description of each of the
tests. If there are Self Test failures, see Table 4-1 for instructions on how to
proceed with determining a resolution for the failure.
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