Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 233
Micro-Deck Assembly
A7 Micro-Deck Assembly Troubleshooting
A7 Micro-Deck Assembly Troubleshooting
A7 Micro-Deck assembly faults could manifest themselves in a broad range of
failure symptoms. While there are many assemblies on the A7 Micro-Deck
assembly it can only be replaced as an assembly, so isolating the fault to one
of the lower level assemblies will not be necessary. The goal of the procedures
found in this section will be to determine if a fault is caused by this assembly or
not.
To provide access to the internal circuitry required to perform some of the
troubleshooting procedures in this section the instrument outer cover and
inner top cover will first need to be removed. Refer to Chapter 15, “Assembly
Replacement,” for instructions on how to remove and reinstall these covers.
Before replacing the A7 Micro-Deck assembly be sure to do the following:
1. Verify the power supply voltages by seeing the “Power Supply Status
Quick-Check” section in Chapter 8, “Power Supply”
2. 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”
3. Run the A7 Micro-Deck Related Adjustments listed later in this section.
If it has been determined that the A7 Micro-Deck needs to be replaced see the
“Pre Repair Procedures” section in Chapter 16, “Pre and Post-Repair
Procedures,” before removing the defective assembly.
Signal Path
Generally speaking, if an instrument has a power level issue only below 3.2
GHz, it will most likely be due to a problem with the A3 RF assembly. If the
problem exists only at 3.2 GHz or above, it will most likely be due to a problem
with the A7 Micro-Deck assembly. If the problem is both below and above 3.2
GHz, it could be due to a problem with either the A3 RF assembly or the A7
Micro-Deck assembly. Since a power level issue will almost always be
accompanied by an unleveled condition, the cause of a power level issue can
be verified by using the procedure for these instruments found in the
“Unleveled Issues” section of Chapter 6, “Troubleshooting”
If there is a power level issue and there is no unlevel error the most likely cause
will be the A7AT1 Attenuator, as it is outside of the ALC loop.
Automatic Leveling Control
If there are any ALC issues, see “Unleveled Issues” in Chapter 6,
“Troubleshooting”
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