Model 5315A/ B
Service
6·2
3-14. Identification Markings
on
Printed Circuit Boards.
8-15.
HP
printed circuit boards (see Figure
8-1
)
ha
ve four identification numbers; an assembly
part number, a series number, a revision letter, and a production
code.
The assembly part num-
ber has
10
d
ig
its
(such
as
05315-60002) and
is
the
primary identification.
All
assemb
li
es
with the
same part
number
are interchangeable. When a production change
is
made on an assembly that
makes
it
incompatible with
pre
vious assemblies, a change
in
part
number
is
required. The series
number
(such
as
1832)
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 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 V
II
for
backdating information.
If
it
is high
er,
ref
er
to
the
yellow looseleaf manual change sheets for this
manual.
If
the manual change sheets are missing, contact y
our
local
HP
Sa
les and Service Office.
See
the
listing
on
the
back cover of this manual.
8-16. Revison letters (
A,
B,
etc.) de
no
te changes
in
printed circuit layout. For example,
if
a
capacitor type
is
changed (electrical
va
lu
e
ma
y remain
the
same) and requires
di
ffe r
ent
spacing
for
its
leads,
the
printed circuit
board
layout
is
changed and the re
vis
ion lett
er
is
incremented
to
the
next letter. When a revision letter changes,
the
series
numb
er
is
also usually changed. The
production co
de
is
the
four-digit, seven-segment
number
used for production purposes.
8-17.
SAFETY
CONSIDERATIONS
8-18. Although the 5315A/ B has
been
deSigned
in
accordance wit h international safety sta
nd-
ards, this manual
co
ntains information, cautions, and warnings which must
be
followed to insure
safe operation and to retain
the
5315A/8
in
safe operating condition (also see Section
II,
III,
V).
Service and adjustments should
be
performed only
by
qualified service personnel.
WARNING
ANY INTERRUPTION OF
THE
PROTECTIVE
(GROUNDING)
CONDUCTOR
(INSIDE
OR
OUTSIDE
THE
5315A/B)
OR
DIS-
CONNECTION OF
THE
PROTECTIVE
EARTH
TERMINAL
IS
LIKELY
TO
MAKE
THE
5315A/B DANGEROUS.
8-19.
Any
adjustment, maintenance, and repair of the
opened
5315A/ 8
under
voltage should
be
avoided
as
much
as
possible and, when inevitable, should
be
carried
out
only by a skilled
person who is aware of
the
hazard
in
vo
lved. Capacitors inside the 5315A/B
ma
y
sti
ll
be
charged
even
if
the
5315A/ 8
ha
s
been
disconnected from its
source
of
po
we
r.
WARNING
LINE VOLTAGE
IS
EXPOSED
WITHIN
THE
5315A/B
EVEN
WHEN
THE
POWER
SWITCH
IS
IN
STBY.
REMOVAL OF
THE
POWER
CORD
IS
NECESSARY
TO
FULLY
UNPOWER
THE
5315A/B.
8-20. Make sure that only fuses with the required rated
current
and of
the
specified type
(normal blow, t
im
e delay, etc.) are used for replacement. The use of repaired fuses and the short-
circuiting of fuseholders must
be
avoided. Whenever
it
is
likely that this protection has
been
impaired,
the
5315A/B must
be
made inoperative and
be
secured
against any uni
ntended
operation.
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