Introduction; Pca Access And General Maintenance - Fluke II Series Service Manual

Maintenance
WARNING
THESE
SERVICE INSTRUCTIONS
ARE
FOR USE BY
QUALIFIED
PERSONNEL
ONLY.
TO
AVOID ELECTRIC SHOCK,
DO NOT
PERFORM ANY
SERVICING
OTHER THAN THAT
CONTAINED
IN
THE OPERATOR'S MANUAL
UNLESS YOU ARE
QUALIFIED
TO
DO
SO.
INTRODUCTION
3-1.
This
section contains
maintenance
information for the
performance
testing, calibration,
general maintenance,
and
troubleshooting
of
the 70, 73, 75, 77, 21, and 23
Series
II
Multimeters
(collectively called the
Series
n
meters).
For
operator maintenance and
instrument
specifications, refer to the
Users Manual.
The
performance
tests
are
recommended
as a
preventive
maintenance
tool to verify
proper instrument
operation.
A
one
year
calibration
cycle
is
recommended
to
maintain
the specifications
given
in the
Users Manual. Test equipment
required for
the perfor-
mance
tests
and
calibration
is
listed in
Table
3-1. If the
recommended
equipment
is
not
available, instruments with equivalent
specifications
may
be
used.
PCA ACCESS AND GENERAL MAINTENANCE
3-2.
WARNING
TO
AVOID ELECTRICAL SHOCK,
REMOVE
THE TEST LEADS
BEFORE OPENING THE
CASE,
AND CLOSE
THE CASE BEFORE
OPERATING THE
METER.
TO PREVENT
FIRE,
INSTALL FUSES
WITH THE RATING
SHOWN ON
BACK OF
THE
METER.
CAUTION
To
avoid contaminating the pea
with
oil
from the
fingers,
handle
it
by the edges
or
wear
gloves.
PCA
contamination
may
not
cause immediate
instrument
failure
in
controlled
environments.
Failures
typically
show
up
when
contaminated
units are oper-
ated
in
humid
areas.
Use
the following procedure
for
removing
the
pea
(printed
circuit
assembly) from
its
case:
1.
Set the function switch
to
OFF,
and disconnect
test
leads
if
they are
installed.
2.
Remove
the four
Phillips
screws
from
the
bottom
cover.
3.
Turn
the
meter
face up,
grasp
the
top cover, and
pull the top
cover from
the meter.
4.
Some
Series
II
meters have
a
fuse
on
the
lower
portion
of
the pea.
This
fuse
must
be
removed
to access the
screw
that
holds
the pea to the case bottom.
NOTE
Be
careful not
to lose the
spring located
directly
under
the
screw on
the
back
side of the pea.
5.
The
pea
may now
be removed from
the
bottom
cover.
3-3