SECTION
VIII
SERV
IC
E
WARNING
LINE
VOLTAGE
IS
EXPOSED
WITHIN
THE
5315A/B
EVEN
WHEN
THE
POWER SWITCH
IS
IN
THE
STBY
POSITON.
8-1. INTROD
UCTION
8-
2.
This section contai
ns
the
information
need
to
service
the
531SA/B Universal
Counter.
The
information
includes
recommended
test
equipment
, a
theory
of
operation,
and
troubleshooting
information which includes safety considerations, service aids, block diagrams, and
schemat
ic
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
numb
er
s.
8-3. THEORY OF OPERATION
8-
4.
The overall t
heor
y of operation begins w
it
h paragraph 8-28 and references
the
Overall
Functional Block Diagram, Figure 8-2.
Immed
iately following
is
the
detailed
circuit
theory
,
presented
in
numerical
order
by
assembly reference designator (
Le.
, A 1,
A2
,
A3,
etc.) and refer-
encing
the
respective schematic diagrams.
8-5. TROUBLESHOOTING
8-
6.
Troubles
hoo
ting
fo
r the 5315A/ B
is
performed by selectively isolating and ve
rif
ying
the
proper
operation of
the
various circuit sections. This
is
accomplished
in
an indicated sequence,
through
a series of seven test procedures, k
eyed
.to troubleshooting block diagram, Figure
8-4.
6-
7.
Th
e schematic diagrams for a
ll
of
the
assemblies are l
ocated
at
the
end
of this secti
on,
in
Figures 8-7 thr
ough
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
excee
ds the critical
specifications.
8-10. SCHEMATIC DIAG
RAM
NOTES
8-11.
Fi
gu
re 8-1
shows
the
sy
mbo
ls
used
on
th
e
schematic
diagrams,
Figure 8-1 al
so
shows
the
method
for assigning reference designators, assembly numbers, and subassembly
numbe
r
s.
8-12. Reference Designati
ons
6-13. Assemblies such
as
printed circuit
board
s are
ass
igned numbers
in
sequence,
A 1,
A2,
etc.,
as
shown
in
Table 8-1.
As
shown
in
Figure 8-1, subassemblies within an assembly are given a s
ub-
ordinate A
numb
er. For example, rectifier subassembly
Al,
h
as
the
complete designator A 15Al.
For indivi
dua
l
compo
nents, the
complete
designator is
determined
by
adding
the
assembly
number
and subassembly number,
if
any. For example, CRl
on
the rectifier assemb
ly
is
desig-
nated
A2SA
lCR1.
8
-1
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