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.
To Next Page
Loading...
