HP 8340B Manual page 207

Section
V.
Adjustments
INTRODUCTION
This section provides adjustment procedures for the
HP 8340B/41B
Synthesized Sweepers. These
procedures should not be performed as routine maintenance but should be used (1) after replacement
of
a
part or component, or
(2)
when performance tests show that
the instrument's specifications
cannot be met. Before attempting any adjustment, allow
1
hour warm-up time for the instrument. Table
5-1 lists
the adjustment procedures by test number
in
the
order they appear
in this Section. Table 5-2
lists all
factory selected components.
Table 5-3 lists
adjustment procedures that interact between
assemblies. This table lists the
adjustment paragraphs
that must be checked when an assembly
is
adjusted, parts replaced, or the assembly replaced.
SAFETY CONSIDERATIONS
Although this
instrument has been designed
in accordance with international safety standards,
this
manual contains information, cautions,
and warnings which must be followed to ensure safe opera¬
tion and to retain the instrument
in safe condition.
Service and adjustments should be
performed only
by
qualified
service personnel.
WARNING
Adjustments in this section are performed with power supplied to the instrument while
protective covers are removed. There are voltages at many points in the instrument
which can, if
contacted, cause
personal injury or
death.
Be
extremely careful. Adust-
merits should be
performed only by trained service personnel.
Power
is still
applied to this instrument with
the LINE switch set
to
STANDBY. There
is
no
OFF
position on
the LINE
switch.
Before removing or installing any assembly or printed
circuit board, remove the power
cord from
the rear of the instrument.
Capacitors inside the instrument may
still
be charged, even
if
the instrument has been
disconnected from its source of ac power. Use
a
non-metallic adjustment tool
whenever
possible.
EQUIPMENT REQUIRED
Table
4-1 lists the equipment required for
the adjustment
procedures.
If
the test equipment
recom¬
mended
is
not available, other equipment may be
used
if its
performance meets the "Critical
Specifi¬
cations" listed
in the table. The test setup
used for an
adjustment procedure is
referenced
in
each
procedure.
HP 8340B/41B
Adjustments 5-1