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SECTION
4-1.
INTRODUCTION
4-2.
This
section
contains information concerning
pre-
ventive
and
remedial
maintenance
for
the
Model 341 A/
343A
Voltage
Calibrators.
Preventive
maintenance
consists
primarily
of
cleaning the instrument,
which
is
performed
periodically to sustain
the
instrument
in
peak
operating
condition.
Remedial
maintenance
consists
of
trouble-
shooting,
calibration,
and
performance
test
procedures,
which
are
designed
to aid in
maintaining instrument opera-
tion
within
specifications.
Section
III
of
the instruction
manual
is
an important
supplement
to
the
troubleshooting
section, since a
thorough knowledge
of instrument theory
is
indispensible
in
troubleshooting.
43.
SERVICE
INFORMATION
4-4.
Each
instrument
manufactured
by
the
John
Fluke
Manufacturing
Company
is
warranted
for a
period of
one
year
upon
delivery to
the
original
purchaser.
Complete
warranty information
is
contained
in
the
Warranty
page
located
at the rear
of
this
manual.
4-5.
Factory authorized
calibration
and
repair service
for
all
Fluke Instruments
is
available
at
various
world wide
locations.
A
complete
list
of
factory
authorized
service
centers
is
located
at
the
rear
of
the
manual.
If
requested,
an estimate
will
be provided
to the
customer before
any
re-
pair
work
is
begun on
instruments
which
are
beyond
the
warranty
period.
46.
TEST
EQUIPMENT
4-7.
Figure
4-1
lists
the
equipment
recommended
for
performance
testing,
troubleshooting,
and
calibration.
If
the
recommended
equipment
is
not
available,
other equip-
ment which
meets
the
required
specifications
may
be
used.
48.
GENERAL MAINTENANCE
4-9.
MAINTENANCE
ACCESS
4-10.
Main
circuit
board
components
are accessible
from
the
top of
the
instrument
after
removing
the
top
cover,
which
is
held
in
place
with
six
Dzus
fasteners.
4-1
1
.
The
reference
board and sample
string
assemblies
are
located
in
the
compartment
just
forward of
the
main
circuit
board.
The compartment
covers
are
each held
in
place
with
two machine
screws.
To
replace
components on
the reference
board
assembly,
sample
string
assembly,
or
front
panel assembly,
proceed
as
follows:
a.
Remove
top
and
bottom
instrument
covers.
b.
Remove
the reference
and sample
string
assembly
compartment
covers.
c.
Remove
the
narrow
front covers
just
above and below
the meter.
d.
Remove
the front panel
and
first
bulkhead
assem-
blies
as
a
unit
by
removing
the
eight
screws
which
hold
the assemblies to the side
rails,
disconnecting
the
leads
to pin
1
and 6
of
the
sample
string
assem-
bly,
and
sliding
the assemblies carefully forward,
away
from
the
main
unit, as
far
as
the wiring harness
will
permit.
NOTE
The
shafts
of
the
RANGE
and
first
decade
switches
will
disengage
from
the switch
rotors
as
the front
panel
is
removed.
To
ensure proper
shaft
orientation
when
replacing
the front
panel,
be
sure
to
note
the switch positions
before disassembly.
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