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HP 5384A and HP 5385A
Service
SECTION VIII
SERVICE
8-1.
INTRODUCTION
8-2.
This section provides service information and
symbol descriptions, component locators, and sche-
matic diagrams. The arrangement of the content of
this section is described in detail below. Refer to the
Table of Contents for specific page and paragraph
numbers.
a.
SCHEMATIC DIAGRAM SYMBOLS AND REFER-
ENCE DESIGNATIONS. Describes the symbols used on
schematic diagrams and reference designators used for
parts, subassemblies and assemblies.
b.
IDENTIFICATION MARKINGS. Describes the
method used by Hewlett-Packard for identifying
printed circuit boards and assemblies.
c.
SAFETY
CONSIDERATIONS.
Describes the
safety considerations applicable during maintenance,
adjustments, and repair.
d.
SAFETY SYMBOLS. Lists and describes the
safety symbols used on equipment and in manuals.
e.
RECOMMENED TEST EQUIPMENT. Refers to
test equipment specified in
Table 1-2.
f.
SERVICE AIDS. Information provided to assist
service personnel.
g.
LOGIC SYMBOLS. Description of logic symbols
used on schematics.
h.
THEORY OF OPERATION. Presents the theory
of operation for the HP 5384A and HP 5385A on two
levels.
1.
First, the Overall Counter Operation is de-
scribed using the block diagram. This discussion
introduces the major functional circuits and
briefly explains their purpose and operation
during normal measurements.
2.
Second, the Detailed Theory of Operation gives
an in-depth explanation of each assembly; its
function and operation with respect to measure-
ment cycles. These paragraphs reference the
schematic diagrams.
i.
TROUBLESHOOTING. Provides the trouble-
shooting information for the HP 5384A and HP 5385A
in the following forms:
1.
DIAGNOSTICS, which are built into the instru-
ment. They serve to verify, by self-check, various
functional subsections of the counters' circuitry.
2.
MANUAL TESTS, which refer to block diagrams,
a flowchart and schematics. Schematic diagrams
for all assemblies are provided at the end of this
section. They are arranged in numerical order
according to the assembly number.
8-3.
SCHEMATIC DIAGRAM SYMBOLS
AND REFERENCE DESIGNATORS
8-4.
Figure 8-1
shows the symbols used on the
schematic diagrams. At the bottom of the
Figure 8-1,
the system for reference designators, assemblies, and
subassemblies is shown.
8-5.
Reference Designations
8-6.
Assemblies such as printed circuits are assigned
numbers in sequence, A1, A2, etc. As shown in
Fig-
ure 8-1,
subassemblies within an assembly are given a
subordinate A number. For example, rectifier sub-
assembly A 1 has the complete designator of A25A 1.
For individual components, the complete designator
is determined by adding the assembly number and
subassembly number if any. For example, CR1 on the
rectifier assembly is designated A25A1CR1.
8-7.
IDENTIFICATION MARKINGS ON
PRINTED CIRCUIT BOARDS
8-8.
HP printed circuit boards (see
Figure
8-1) have
four identification numbers: an assembly part number,
a series number, a revision letter, and a production
code.
8-9.
The assembly part number has 10 digits (such as
05384-60001) and is the primary identification. All
assemblies with the same part number are inter-
changeable. When a production change is made on
an assembly that makes it incompatible with previous
assemblies, a change in part number is required. The
series number (such as 2312A) is used to document
minor electrical changes. As changes are made, the
series number is incremented. When replacement
boards are ordered, you may receive a replacement
with a different series number. If there is a difference
between the series number marked on the board and
the schematic in this manual, a minor electrical
difference exists. If the number on the printed circuit
board is lower than that on the schematic, refer to
Section VII for backdating information. If it is higher,
refer to the looseleaf manual change sheets for this
8-1
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Table of Contents
Troubleshooting
