154 Keysight N9038A MXE Service Guide
Input Selection & Level Control
Input Selection & Level Control Section Troubleshooting
8. Switch the instrument to RF Input 2 by pressing Input / Output, RF Input,
RF Input Port, RF Input 2.
9. Referring to Figure 4-18, verify that the DC voltage levels on the 4 pins of
the A23 Limiter assembly front panel LED Drive Output (P2) are as outlined
in Table 4-3 when the RF Input Port is RF Input 2.
If the voltage levels are incorrect verify that the A23 Limiter control
voltages coming from the A21 RF Preselector Input assembly are correct
before replacing the A23 Limiter assembly. This can be verified in the A21
RF Input Assembly section of this chapter.
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