Fluke 415B - Page 39

Section 4
Maintenance
4-1. INTRODUCTION
4-2. This section
contains
information
concerning
maintenance
and
calibration
of the
Model
415B.
Gen-
eral and
unique
maintenance
procedures
are
given in
paragraphs
4-6
through
4-14. Test
equipment
required
for
maintenance is
given
in
paragraph
4-15. Perform-
ance
tests are
given in
paragraph 4-17;
calibration
procedures
are given in
paragraphs
4-29 through
4-34.
Troubleshooting
information is
contained
in
paragraph
4-35.
4-3.
SERVICE
INFORMATION
4-4. Each
instrument
manufactured
by
the
John
Fluke
Mfg. Co.
,
Inc.
is
warranted for
a
period of
one
year
upon
delivery
to the
original
purchaser.
Complete
warranty
information is
contained
in the
warranty
page
located in
the
rear of
this
manual.
4-5.
Factory
authorized
calibration
and
repair
service
for all
Fluke
instruments
are
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
repair
work is
begun on
instruments
beyond
the
warranty
period.
4-6. GENERAL
MAINTENANCE
4-7. Maintenance
of
the
Model
41 5B
consists
primarily
of
occasional
cleaning,
tube
replacement
and
calibration.
Removal
of the
top
cover
opens
the
inter-
lock switch.
To
have high
voltage
applied, the
interlock
must be
disabled.
DANGERI
Hazardous
voltages
exist in
this instrument!
The
metal shells of some
electrolytic capacitors
may
be
elevated to 3185
volts above ground.
Before
servicing
or removing
tubes,
short
all
electrolytic
capacitors and
plate caps
to the
chassis.
Use a
1
,000
ohm 2 watt resistor
in
the
shorting
lead.
4-8.
Cleaning
4-9.
Periodic
cleaning
of
the
Model 415B is
desirable.
Any
contamination,
particularly
on
the high
voltage
capacitors,
will cause
corona
discharge which
will
appear as
noise
in the
output
voltage.
Removal of
dust
with low
pressure
compressed
air
or a vacuum
cleaner
should be
all
that is
normally
required.
4-10.
Components
may be
cleaned using
Freon TF
Degreaser
(Miller-Stephenson
Chemical Co.), or with
a
cloth
saturated
with
denatured
alcohol.
4-11. Circuit
Board
Sealant
4-12.
The
land
pattern
side
of
all
printed circuit
boards
in the
Model 415B
has
been
treated
with Epocast (a
poly-
urethane
resin) to
inhibit
fungus
growth and
moisture'
absorption.
When soldering
to
a
printed circuit
land,
the
heat from the
soldering
iron
decomposes
the
Epocast
resin,
leaving
a charred
residue.
Upon
completion
of
soldering,
this residue
should
be
removed with a sol-
vent, such
as
toluol.
CAUTION!
When using
toluol,
avoid inhaling
the
vapors,
.
avoid
excessive contact
with the skin, and keep
away from
open flames.
Insure that plastic
components do not
come in
contact with toluol,
since it
will dissolve
most types of
plastics.
After
removal
of Epocast
residue, the
affected area
should be
recoated
with a
sealent. A spray
can of Cir-
cuit Coat
(Furane
Plastic
Inc.
,
4516
Brazil Street,
Los
Angeles,
California
or 16 Spielman
Road,
Fairfield,
New
Jersey)
may be
used for
recoating.
4-13. Fuse
Replacement
4-14. Listed
below
is
the
correct
replacement for the
line power
fuse.
Use only the
correct
rating
as
a re-
placement.
LINE
VOLTAGE
TYPE
115
vac
3
amp,
slow blow
230 vac
1.
5 amp,
slow
blow
4-15. TEST
EQUIPMENT
REQUIRED
FOR
MAINTENANCE
4-16. The
test
equipment
required
for maintenance
is
listed in Figure
4-1.
Equivalent
or
similar
units
may
Rev. 1
4-1