Table of Contents
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Model
8672A
Adjustments
SECTION
V
ADJUSTMENTS
5-1.
INTRODUCTION
5-2. This section contains adjustments and checks
that
assure
peak performance
of
the Synthesizer.
This instrument should
be readjusted
after
repair
or failure
to
pass
a
performance test.
Allow
a
30
minute warm-up
prior to
performing the
adjustments.
5-3.
The
order in which the adjustments
are
made
is
critical.
Prior to making any adjustments, refer
to the paragraph entitled Related Adjustments.
5-4. Determining the adjustments to
be
performed
after
a
component failure
and subsequent repair
or
a
performance test failure
is
important.
This
will
help keep the adjustment
time to
a
minimum.
After
the repair
and/or
adjustment,
performance
tests
are usually required
to verify proper perform¬
ance.
Refer to the
paragraph entitled Related
Adjustments.
5-5.
SAFETY CONSIDERATONS
5-6. This
section contains
information,
cautions
and warnings which
must
be
followed for your
pro¬
tection
and
to
avoid damage to
the equipment.
WARNINGS
Maintenance
described in this section
is
performed with power
supplied to the
instrument and
with
protective
covers
re¬
moved.
Maintenance
should
be
per¬
formed
only by service trained personnel
who
are aware
of
the hazard involved
(for
example, fire and electrical shock).
Where maintenance can
be
performed
without power
applied, the
power
should
be
removed.
A
pin-to-pin
voltage difference
of 60
Vdc
may
be
found on many
of
the
Synthe¬
sizer's circuit
board connectors. Be
care¬
ful while working on
the
circuit
boards
with power
supplied
to
the instrument.
If
a
circuit
board
is
placed on an
exten¬
der board, the possibility
of
coming in
contact
with 60 Vdc
is
greatly increased.
Be
careful while working on
the
circuit
boards
with power
supplied.
Work with
one hand.
Do not touch
the
extender
board.
5-7.
EQUIPMENT REQUIRED
5-8. Each adjustment procedure contains
a
list
of
required
test
equipment
and accessories.
The
test
equipment
is
identified
by
callouts in the test setup
diagrams included
with
each
procedure.
5-9.
If
substitutions must be made
for the
speci¬
fied
test
equipment, refer to Table 1-2
for
the
minimum
specifications.
It
is
important that
the
test equipment
meet the critical
specifications
listed in the table
if
the Synthesizer
is
to meet
its
performance requirements.
5-10. The HP
11712A
Service
Kit
is
an accessory
item
available
from Hewlett-Packard for
use
in
maintaining the Synthesizer.
5-11.
FACTORY SELECTED COMPONENTS
5-12. Factory
selected components
are
identified
on the schematics and parts list
by
an asterisk
which follows the reference designator. The normal
value
or
range
of
the components
are
shown.
The
manual
change sheets
will
provide updated
infor¬
mation pertaining to the
selected components.
Table
5-1
lists
the
reference designator,
the
criter¬
ion used for selecting
a
particular value, the normal
value range, and the
service sheet
where the
com¬
ponent part
is
shown.
5-13.
RELATED ADJUSTMENTS
5-14.
If
all
the adjustments
are
to
be performed,
they
should
be
done in order
with
the exception
of
the
A2
Assembly Adjustments. These adjustments
should be
performed after the
M/N
Loop
Adjust¬
ments and before the
YTO
Sampler Adjustments.
5-15.
In the
event
of
a
performance
test or compo¬
nent failure, it must
be
determined
if
an
adjust¬
ment procedure
should be
performed
or
if
the
in¬
strument
should be repaired. Tables 5-2 and 5-3
indicate the required action in either
case.
5-16.
After
the instrument
is
repaired
and/or
ad¬
justed, performance test(s),
a
frequency check
and
verification
of
phase
lock or
all
of
these things
must be done to
verify proper performance
of
the
5-1
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