Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 265
Baseband Generators
A7A1 Real-Time Aux. Power Supply Troubleshooting
A7A1 Real-Time Aux. Power Supply Troubleshooting
The following troubleshooting procedure assumes that A7 DS11, as shown in
Figure 12-12, is not on when AC power is applied to the instrument. If it is, see
the “A7 Real-Time BBG Assembly Troubleshooting” procedure.
1. Turn the instrument off, but do not remove the AC power from the rear
panel of the instrument.
2. Referring to Figure 12-13, verify that LED1 is on:
— If LED1 is on there is either a problem with W12 or its connection at
either end.
— If LED1 is off, proceed to step 3.
3. Remove the power cord from the rear of the instrument.
4. Inspect the connections at both ends of W10 to verify that it is properly
connected. Remove W10 and inspect it, as well as inspecting the
connectors on both power supplies if necessary.
If there is no problem with W10 or the connections, replace the A7A1
Real-Time Aux. Power Supply. If the problem persists after replacing it,
replace the A1 Power Supply assembly.
The AC power source from the A1 Power Supply assembly that
powers the A7A1 Real-Time Aux. Power Supply is on whenever
there is AC power supplied to the instrument, whether it is turned
on or not. Do not attempt to remove any of the cables to or from
either supply when an AC power cord is attached to the instrument.
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