LFE 2000 Series - Page 100

953-3
I
REV
SECTION
1O
-
TROUBLESHOOTING
GUIDE
10. i
GENERAL
Thls
sectlon
along
wlth
the
calrbration
rnforrnatlon
in
the
prevrous sectfons
ls
intended
to
provide
information
to
ald
in
dlaBnosing
the
cause
of farlure
in
the
controller
as
well as a
checkout
guide
after
repairs
have
been
performed'
Many failures
may
result
from
misoperation
rather
than
actual
equi-pment
failure'
All
conrrections
and
settings
should
be carefully
evaluated
prior
to any
troubleshootrng,
on the
controller
itself.
t,
WARNING
'',
INADVERTENT
EXPOSURE
TO
LINE
POTENTIAL
IS POSSIBLE.
TO
INSURE
SAFETY
]N TROTJBLESHOOTING,
REMOVE
ALL
POWER
PRIOR
TO
MAKING
CONNECTIONS
L]F
TEST
EQUIPMENT
OR BEFORE
TRACING
WIRING
ITSEt,F.
;-;;;;;;;-;
MOS STATIC
DISCHARGE
HANDLING
PRECALITIONS
MUST
BE
TAKEN
IN
THE
WORK
AREA
TO PREVENT
STATIC
DISCHARGES
EROM
CAUSING
DEVICE
FAII,URES.
NO
MODIFICATION
OR REPAIR
SHOULD
BE
PERFORMED
UNTIL
PROPER
PRECAUTITJNS
HAVE BEEN
TAKEN.
(See
Sect,ion
1.13
-
MOS
handling
precautiorrs)
It
is recommelded
that the
electronics
package
be
retnovecl
f t-orn
the control
ler case
for
t.roubleshooting.
The use
of a
calrbration
connector
(l,FF,
P/N
345-826)
avarl;rble
from
the factory
ls recommended
for easy
access
to
printed
cir-cuit
board
surlaces
and
conponel-lts.
Further
disassembly
nray be
requirecl
for removal/
replacenrerrt
of
some
components.
The
test equiprnerrt required
for
troubleshooting
should
include
arl oscllloscrlpe
Lcl
monitor
wave forrns
up to 20
MHz,
a hrgh
rmpedance
digital
voltmeter,
aud a
varrable
AC
power
source
(variac)
of 120!15
VAC.
Thi-s is
rn addition
to
the
test
eqttlpnretlt
prescrrbed
for unit
calibration.
The
Series 2000
cont-rol ler
inc ludes
a
ditrtal
conrputer
containr-ne
hieh
speed lnemory
devices. If a
controller
begins
actlng
abnorrnally,
the
cause
may be
alr
erroneous
data
pattern
set into a nemory
devrce
by a static
dtscharge,
electro-magrretlc
field,
or other
factor.
Such an occurance
may
damage
the
data
in a
controller
wlthout
actually
darnagrnB the
control ler hardware.
The melnory
clear
pr-ocedtrre
described
jn
Section 9.3
will erase all
data and
start
the controller
in
a
precalibratron nrode.
This
procedure
should
be
attempted
on
units
that act
abnormally
before-'
trouble-
shooting
begrns.
-93 -
LFE
Instruments
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