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1-8 SERVICE STRATEGY This paragraph provides an overview of the 373XXA VNA service strat
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egy and available service facilities. It also provides references to the infor
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mation in various locations in this manual needed to accomplish the serv
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ice functions required for the 373XXA VNA.
Appendices - Refer to the Appendices at the rear of this manual for de
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tailed descriptions of the following:
q
Diagnostics Menus and GPIB Commands.
q
Error Messages.
q
System Block Diagrams.
q
Parts Locator Diagrams.
Functional Assembly
Level Troubleshooting
The 373XXA modular design, extensive built-in diagnostics, and auto
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mated service tools are designed to support fast exchange of functional as
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sembly level repairs.
Failed assemblies are not field repairable. Once an assembly is found
to be faulty, it should be returned to an authorized ANRITSU Service
Center for exchange. Refer to the description of the Exchange Assem-
bly Program in Chapter 2, Replaceable Parts.
The procedures for troubleshooting a failed 373XXA VNA are de-
scribed in this manual in Chapter 5, Troubleshooting.
Internal Hardware
Adjustments and
Calibrations
There are five automated internal hardware field calibrations. Two of
them are used to characterize the 373XXA frequency and power genera
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tion sub-systems. These calibrations insure fast, consistent phase lock of
system frequencies and proper compensation, leveling, and flatness of
system power at the front panel test ports.
To conduct these calibrations, you need only connect the appropriate
test equipment (counter or power meter) to the 373XXA and initiate
the calibration. The 373XXA will control itself and the externally con
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nected test equipment to perform measurements and store calibration
constants in its internal battery backed RAM (BBRAM).
The procedures for adjusting the 373XXA VNA are described in this
manual in Chapter 6, Adjustments.
Internal Service Log The 373XXA continuously monitors itself for proper operation. Should a
failure occur, it notifies the user via a failure message on the display
screen. (In remote-only operation, it also sets the GPIB Status Byte, if
enabled.) It also writes the error message along with some data pertinent
to the failure to an internal service log stored in battery backed memory.
The service log can be checked at any time to view (without erasing)
all error messages that were written into it. It is capable of storing
GENERAL INFORMATION SERVICE STRATEGY
373XXA MM 1-5