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Preface
This manual provides assembly-level service information for the
Symmetricom 5071A Primary Frequency Standard.
Repair Strategy
The Symmetricom 5071A Primary Frequency Standard can be returned to
Symmetricom for all service work, including troubleshooting, and verifying
specifications. Contact Symmetricom for more details.
If you decide to service the instrument yourself, use the operational
verification procedure in Chapter 1, “Performance Tests,” in this manual to
define the type of problem. For more complete tests, use the full performance
tests in Chapter 1. After a repair, re-check the Standard's operation with the
verification or full-performance test procedures.
This service manual is designed to isolate failures to the assembly or module
level only. If a failure occurs, you can isolate the faulty assembly or module
by using the procedures in Chapter 2 “Service.” The procedures in Chapter 4
“Replacing Assemblies” enable you to remove and replace defective
assemblies or modules.
Text Conventions used in this manual
Throughout this manual there are symbols used to denote special meanings.
These are explained below:
< > These separators mark where information may be any value or text (otherwise
known as “wild cards”). The actual value in these cases is not critical to the process.
Instrument Identification
Instrument identification is made from the serial number located on the rear
panel of the 5071A. Symmetricom uses a two-part serial number with the first
part (prefix) identifying a series of instruments and the second part (suffix)
identifying a particular instrument within a non-repeating series. A
Symmetricom assigned alpha character within the serial number identifies the
country in which the instrument was manufactured. The letters “A” or “US”
denote manufacture in the United States of America.
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