Keysight N5224B, Service Manual

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4-32 Keysight N5224B/25B Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
EEPROM Headers
The network analyzer application uses the firmware revision information stored
in the PC board header EEPROM. If the information stored in any EEPROM is
incorrect, the network analyzer may not operate properly.
The following link lists the pc boards in your network analyzer that contain
EEPROM headers. The pc boards are listed by name and part number and the
correct firmware revision code is given for each. Refer to:
A: EEPROM Address Assignments and Location(N5224/5A&B PNA and
N5244/5A&B PNA-XInstruments)
.
press UTILITY , then , then , then
. Refer to Figure 4-7 .
If the information is incorrect for any of the PC boards, contact Keysight
Technologies. Refer to “Contacting Keysight” on page 2-7 .
Figure 4-7 EEPROM Header Info Dialog Window
Error Messages
SOURCE UNLEVELED:
The source ALC circuit on the A23 test set motherboard
is running open-loop. Check the cable connections for the A25 HMA26.5 and
the A23 test set motherboard.
Verifying the A, B, C, D, and R Traces (Standard S-Parameter Mode)
The first step is to verify that the A, B,C, D, and R traces are present and that
they are approximately level:
System
Service Utilities
View EEPROM Headers
To view this EEPROM header information on the network analyzer display: