MN469xC Series Multiport Test Set MM
PN: 10410-00730 Rev. D
4-1
Chapter 4 — Troubleshooting
4-1
Introduction
This chapter provides information about troubleshooting tests that can be used to check the MN469xC
Multiport Test Set for proper operation. These tests are intended to be used as a troubleshooting tool for
checking the functionality of the components and sub-assemblies in the test set.
4-2
General Safety Warnings
Many of the troubleshooting procedures presented in this chapter require the removal of instrument covers to
gain access to subassemblies and modules. When using these procedures, please observe the warning and
caution notices.
4-3
Troubleshooting Strategy
The VectorStar Multiport VNA System consists of two instruments:
•
The 2-Port VectorStar MS4640A/B Series VNA
•
The VectorStar Multiport MN469xC Test Set
A good understanding of the VectorStar Multiport VNA System operation is an important aid to
troubleshooting system failures. Refer to the descriptions of system operation, and block diagrams located in
Section 1-5 “VectorStar Multiport VNA System Overview” on page 1-4
and
Section 1-6 “MN469xC Multiport
Test Set Functional Description” on page 1-5
It is also imperative to isolate whether the system fault is in the VectorStar VNA or the MN469xC Test Set.
Suggested Troubleshooting Steps
The suggested troubleshooting steps for MN469xC Test Set are as follows:
•
Identify whether the fault is unique to the MN469xC Test Set (e.g. Unable to power on, etc.).
•
Verify whether the fault is related to system setup and installation (e.g. GPIB cable, GPIB Address,
inter-connect RF cable condition and connection and etc). Refer to
VectorStar MN469xC Series Multiport
Test Set Installation Guide – 10410-00288.
•
Verify whether the 2-Port VectorStar VNA is in good condition by itself. Refer to the
MS4640A Series
VNA Maintenance Manual – 10410-00268, or the MS4640B Series VNA Maintenance Manual –
10410-00320
.
•
Perform the troubleshooting tests in this chapter.
•
If possible, swap the suspected faulty component or PCB with the component or PCB from the known
working switching signal path.
•
For example, if you suspect that Port 1/Port 2 Low Band Switch is faulty, swap it with the
Port 3/Port 4 Low Band Switch.
Warning
Hazardous voltages are present inside the instrument when AC line power is connected. Before
removing any covers, turn off the instrument via the Main power switch on the front panel and unplug
the AC power cord.
Caution
Many assemblies and modules in the MN469xC contain static-sensitive components. Improper
handling of these assemblies and modules may result in damage to the assembly and modules.
Always observe the static-sensitive component handling precautions.