Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 263
Baseband Generators
A7 Real-Time BBG Assembly Troubleshooting
Figure 12-11 A7 Real-Time BBG Assembly Partial Identification
If this is seen the assembly will not function properly or pass the associated
Self Tests. Determine which of the possible reasons listed above are causing
the assembly to not identify properly before continuing.
Power Supply Verification
The A7 Real-Time BBG assembly is powered by the A7A1 Real-Time Aux.
Power Supply. It receives +12 VDC from this supply and regulates it to multiple
other DC voltages needed by the different sections of the assembly.
To verify the power supply voltages:
1. Turn the instrument power on.
2. Referring to Figure 12-12, first verify that DS11 is on. This LED indicates
that the +12 VDC power supply to the assembly from the A7A1 Real-Time
Aux Power Supply is present.
— If DS11 is not on see the “A7A1 Real-Time Aux. Power Supply
Troubleshooting” section in this chapter.
— If DS11 is on proceed to step 2.
3. Verify that the rest of the power supply LEDs shown in Figure 12-12 are on.
LED DS17 is not a power supply LED, it is a lock indicator for the 100 MHz
reference on the assembly. It phase locks to a 100 MHz LVDS reference
signal from the A2 Vector BBG assembly. This LED should also always be
on.
— If any of the power supply LEDs are off, while DS11 is on, replace the
A7 Real-Time BBG assembly.
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