Keysight N9038A MXE Service Guide 149
Input Selection & Level Control
Input Selection & Level Control Section Troubleshooting
A23 Limiter Assembly
There are two functions of the A23 Limiter assembly that need to be verified,
the signal path loss and the control for the front panel input selection LEDs, as
seen in Figure 4-15.
Figure 4-15 A23 Limiter Assembly
Verifying Signal Path Loss
1. Remove the instrument dress cover (MP24) and the top brace (MP10).
Refer to Chapter 18, “Assembly Replacement Procedures.” for instructions
on removing these covers.
2. Remove the hardware that attaches the front frame assembly to the
chassis and slide it away from the rest of the instrument, but do not
disconnect W8 which connects it to the A8 Motherboard assembly. Refer
to Chapter 18, “Assembly Replacement Procedures.” for instructions on
removing the front frame assembly.
3. Referring to Figure 4-16, disconnect W27 from the A23 Limiter assembly
Output (J103).
Refer to Chapter 15, “Block Diagrams.”.
If there is a particular frequency of interest use that instead of the 100 MHz used in this example
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