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more than 30 pages of service messages and data. The 373XXA will
automatically remove the oldest errors first to make room for new er
-
rors, if necessary. To check the contents of the service log, use the pro
-
cedure described in Chapter 3, Operational Tests.
NOTE
A printed or disk file copy of the Service Log (with the fail
-
ure in question) must be made available to ANRITSU
when exchanging a failed assembly, or when requesting
service support. Refer to Chapter 2, Replaceable Parts, for
further information.
System
Test/Certification
Quick operational checkout of the system may be accomplished by the
system user or for incoming inspection purposes using the “Operational
Checkout” chapter in the 373XXA Operations Manual. Those procedures
are useful in quickly verifying that the instrument’s primary measure
-
ment functions are operational and stable.
Full operational testing of the system is detailed in Chapter 3, Opera-
tional Tests. These tests should be performed annually, or more often
depending on system use.
Verification of the system’s measurement accuracy and other key per-
formance parameters may be done using the procedures in Chapter 4,
Performance Verification. This should be performed annually, or more
often depending on system use.
Preventive Service The 373XXA A9 Processor PCB contains a battery backed memory/real
time clock chip (BBRAM) and a static memory (SRAM) backup battery.
These have a finite life span and should be replaced periodically per the
procedures in Chapter 8, Removal and Replacement Procedures.
The BBRAM chip has a rated life span of 4 years. The SRAM backup
battery has a worst case elapsed time for SRAM battery protection of
200 days. The SRAM battery life span will vary according to how the
system is used; that is, how often the system is powered off for ex
-
tended periods of time.
Servicing Specially
Modified Instruments
Instruments with customer requested special modifications performed by
ANRITSU will have an identifying Specials Modification number printed
on the rear panel. This number will be preceded with the letters SM, i.e.,
SM1234 is special modification number 1234.
Special instruments may have service requirements different from
those specified in this manual. Contact your local Service Center if you
need more information when servicing such instruments.
1-9 SERVICE SUPPORT The following paragraphs briefly describe the various service support
services and aids available to you to help you maintain your 373XXA.
SERVICE SUPPORT GENERAL INFORMATION
1-6 373XXA MM