Tektronix 067-0892-00, Инструкция по эксплуатации, Страница: 57 / 110

MicroLab
|
Instruction
Section 7
MAINTENANCE AND TROUBLESHOOTING
Introduction
This
section
describes procedures
for preventing or
reducing equipment
malfunction,
and includes
techniques
and aids
for troubleshooting.
Preventive
maintenance
improves equipment
reliability. Should
the
equipment
fail
to operate
properly, corrective measures should
be taken
immediately;
otherwise, additional problems may develop
within
the equipment.
statics
Sensitive Devices
10.
Minimize the
handling
of
static-sensitive parts.
Transport
and
store
static-sensitive parts
in
their
original
containers,
on
a metal
rail,
or on conductive
foam.
Label
any
container
having
a
static-sensitive
assembly
or device.
Discharge
the
static
charge on yourself
by using
a
wrist
strap
before handling
these
devices.
It
is
recommended
that
servicing
of
static-sensitive
assemblies
or
devices
be
performed
only
ata
static-
free
work
station
by
qualified
personnel.
Do
not allow anything capable of
generating or
holding a
static charge onto the work
station
surface.
Keep
the
leads
shorted
together
whenever
possible.
Pick
up
the
part
by
the
body, never
by
the
leads.
Do
not
subject the
part to sliding
movements
over
any
surface.
Avoid
handling parts
in areas
having
a
floor
or
work
surface
covering
that
contributes
to
the generation
of
a
static
charge.
Use
a
soldering
iron
that
has
a
connection
to
earth
ground.
Use
a
special anti-static
suction-type
desoldering
tool,
such as
the Silverstat
Soldapulit,
or a
wick-
type desoldering
aid.
Reducing
ee
cepaniltty
To
Static
Discharge
The
following
safeguards have
been
provided
to
reduce the
change
of
static
discharge
damage:
1.
The ground
(earth)
wire
of
the
primary power cable
is
connected
to
the chassis
where
the
cable
enters
the
unit.
2.
The
shields
of
interconnecting EIA
cables are
grounded
to
the
chassis
at the cable entrance
or
egress of
each
unit.
3. All interconnecting
ribbon cables have
a
built-in
ground plane
which
is
grounded to
the chassis
at
the cable
entrance
or
egress
of
each
unit.
4.
Ground loops have been avoided
by
installing
a
common ground between
all
units. Grounding
straps are
utilized
where necessary.
3
CAUTION
3
Violation or
modification
of
the
preceding safeguards
can result
in
ground loops
and/or
static discharge
problems.
Preventive Maintenance
Preventive
maintenance consists
of
cleaning, visual
inspection,
and performance
checks. The preventive
maintenance schedule established
for
the equipment
should
be
based
on
the amount
of
use,
and
on
the
environment
in
which
the
equipment
is
operated.
Cleaning
Clean
the
equipment
often
enough
to
prevent
dust
or
dirt
from
accumulating
in
or
on
it. Dirt acts as
a
thermal
insulator and prevents
efficient
heat
dissipation.
It
also
provides high-resistance
electrical
leakage paths between
conductors
or
components
in a
humid environment.
7-1