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General Information
This HP
8562E
Spectrum Analyzer Service Guide contains information required to adjust and
service the HP 85623 to the assembly level.
Serial Numbers and Repair Information
Hewlett-Packard makes frequent improvements to its products to enhance performance,
usability, or reliability. Hewlett-Packard service personnel have access to complete records of
design changes to each type of equipment, based on the equipment serial number. Whenever
you contact Hewlett-Packard about a product, have the complete serial number available to
ensure obtaining the most complete and accurate information possible.
The serial number label is usually attached to the rear of the product. The serial number has
two parts: the prefix (two letters and the first four numbers), and the suffix (the last four
numbers).
Serial Number Label Example
The two letters identify the country in which the unit was manufactured. The four numbers of
the prefix are a code identifying the date of the last major design change incorporated in your
Hewlett-Packard product. The four-digit suffix is a sequential number and, coupled with the
prefix, provides a unique identification for each unit produced. Whenever you list the serial
number or refer to it in obtaining information about your Hewlett-Packard product, be sure to
use the complete number, including the full prefix and the suffix.
Units which were produced before the serial number format was changed may also be covered
by this documentation. On earlier serial number labels, the prefix consists of the first four
numbers and a single letter. The suffix is a five-digit sequential number.
General Information
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