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SECTION VIII
SERVICE
WARNING
LINE
VOLTAGE
IS
EXPOSED
WITHIN
THE 5315A/B EVEN
WHEN
THE POWER SWITCH
IS IN
THE STBY
POSITON.
8-1.
INTRODUCTION
8-
2.
This section conta
ins
the
information need
to service the 531SA/B Universa
l
Counter. The
information includes
recommended test
equipment,
a theory
of operation, and
troubleshooting
information which
includes
safety
considerations, service aids,
block
diagrams,
and schematic
diagrams.
This
sed
ion
also includes
a
cro!>s-reference
table,
Table 8-1,
to
aid
the
co
rrelation of
assembly
reference
designations
with
their
HP part
numbe rs.
8-3.
THEORY OF OPERATION
8-4. The overa
ll
theory
of operation
begins
with
paragraph 8-28 and references
the
Overall
Functional Block
Diagram,
Figure
8-2. Immediately
following
is the detailed
circu
it
theory,
presented in
numerical
order by assemb
ly
reference designator
(Le.,
A
1, A2,
A3,
etc.
)
and refer-
encing the
respective sche
matic diagrams.
8-5. TROUBLESHOOTING
8-6.
Troub leshooting
fo
r
the
5315A/
B
is
performed
by
selectively isolating and
verifying
the
proper operation
of the
various circuit sections. This is accomplished
in
a
n
indicated seq
uence,
through
a
series of seven test
procedures,
keyed.to
troubleshoot
ing block
diagram,
Figure
8-4.
6-7.
The
schematic diagrams for
all
of the assemblies
are located at the
end
of
this
section, in
Figures
8-7
th rough
8-9.
8-8.
RECOMMENDED
TEST
EQUIPMENT
8-9.
The test
equipment and accessories
required
to
maintain
the
5315
A/B
are listed
in
Table
1-4.
Equipment other than that
listed
may
be
used
if it
meets or
exceeds
the critica
l
specifications.
8-10.
SCHEMATIC
DI AGRAM
NOTES
8-11.
Figure 8-1
shows
the
symbols used on
the
schematic diagrams, Figure 8-1 also shows the
method for
assigning reference
designators, assembly numbers,
and
subassembly numbers.
8-12. Reference
Designations
6-13.
Assemblies
such as
printed circuit
boards
are
ass
igned numbers
in
sequence,
A
1,
A2,
etc.,
as
shown
in
Table
8-1.
As
shown in
Figure
8-1,
subassemb lies
within
an assembly are given a
sub-
ordinate
A numbe r.
For
example,
rectifier
subassembly
Al, has
the complete designator A
15Al
.
For
individual
components,
the complete designator
is
determined by adding the assembly
number
and subassembly number,
if
any.
For
e xamp le, CRl on the
rect
ifier
asse mbly
is desig-
nated
A2SA lCR1.
8-1
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