Name: Keysight N9038A
Brand: Keysight
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Keysight N9038A MXE Service Guide 309

Reference Assembly

A16 Reference Assembly Troubleshooting

While there are many outputs from the A16 Reference assembly not all are

currently used by the instrument and the ones that are will be verified in this

section. There are also a number of status LEDs that can be monitored to get

an indication of the status of the different functions of the assembly.

Assembly Initialization

Before the A16 Reference assembly will function properly it needs to initialize

itself when the instrument is turned on and be recognized by the instrument

software. The first step in verifying that this has happened is to look at the

instrument Hardware Information screen. To view this information press

System, Show, Hardware. Once you do this you will see a listing of instrument

hardware assemblies that are installed. The A16 Reference assembly should

identify itself on this list as Reference. If this assembly does not identify itself

the cause for this will need to be determined before any other troubleshooting

is performed. The most probable causes for this type of a problem would be:

— FPGA Code on the assembly is corrupt

Solution: Reload the FPGA code. See“FPGA Synchronization” on

page 655.

— An instrument power supply voltage is not operating properly

Solution: Verify all instrument power supply voltages. See Chapter

12, “Power Supply & Midplane”.

— A16 Reference assembly is defective

Solution: Replace the A16 Reference assembly

Assembly Status LEDs

As illustrated in Figure 9-2, there are two sets of diagnostics LEDs on the A16

Reference Assembly. Six LEDs are on the right side of the A16 Reference board

and five LEDs are on the A16A1 Reference Daughter board. Table 9-2 lists the

diagnostic LEDs and what their status indicates.

A blinking red LED typically indicates that an unleveled condition exists. The

number of blinks indicates what circuitry is unleveled, as indicated in Table

9-2.

Refer to Chapter 15, “Block Diagrams”.

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Model

N9038A

Keysight N9038A Service Guide

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