Fluke 8010A User Manual

MAINTENANCE
TROUBLESHOOTING
4-60.
TROUBLESHOOTING
CAUTION
Static
discharge
can
damage MOS
components
contained
in
your instrument.
Observe
the
precautions
given
in
the
Static
Awareness
Sheet
at the
front of this
section.
4-61.
A
troubleshooting
guide for
your instrument is
give in
Table
4-8.
To
use
this
guide,
complete
the
Performance
Test
(given
earlier
in this
section) and
note
any
discrepancies.
If
your
Multimeter
fails
a
procedure,
locate
the
heading
of
that
procedure
under the Test
and
Symptom
column
of
Table
4-7.
Find the
symptom
that
describes
the
problem
which
occurred
during
the
procedure.
Note
the
possible
causes
of
the
malfunction
under
the
Possible
Cause
heading.
Details
necessary
to
isolate
a
particular
cause
can be
derived
from
the theory
'of
operation
in
Section 3
and
the
schematic
diagrams in
Section
7.
Table
4-9
lists
the
test
points
in the
instrument.
Table
4-8.
Troubleshooting
Guide
TEST AND
SYMPTOM
POSSIBLE
CAUSE
INITIAL
PROCEDURE
Display
blank
Power supply, power
switch, U3.
DISPLAY
TEST
One
or more
segments will not light through
entire test.
Display
interconnection,
display,
or
A/D Converter
U3.
Decade
inoperative
or one
or
more
segments
always
lit U3.
Improper
decimal
point
indication.
Range switches, U5,
U6, or
display.
(Check
signals at
U6
to isolate.)
Minus sign
improperly
displayed.
U3.
Display
lit
but
does
not
respond to
changes in
input.
Reference
U7,
crystal
U1
,
A/D
Converter U3,
Touch
and
Hold
signal
line
grounded,
Q3,
Q4.
RESISTANCE/CONDUCTANCE
TEST
Displayed
reading
is
out of
tolerance
on
at
least
one but not
all
ranges.
Range
resistor
U1 or
R3.
Readings are
noisy
on
all
ranges.
Thermistor
RTl.
Readings
are out of
tolerance on
high ohms.
RVl, RV2,
RV3 overheated
from
severe overload.
Residual
reading with test leads
open.
PCB
is
contaminated.
(See
cleaning
procedure
Section
4.)
DC
VOLTAGE
TEST
Display
reading
is
out
of
tolerance
on
200 mV
or
2V
range.
Out of
calibration
(DC),
Vref (U7,
in error,
R4, U3.)
Readings
are
out of
tolerance on
all
ranges
except 200
mV and 2V.
Range resistor U1
.
AC
VOLTAGE
TEST
Displayed
reading
is out of
tolerance on
200
mV range.
Out of
calibration
(AC),
AC
converter
defective.
Readings out of
tolerance on
all ranges except
200 mV.
.
Range
resistor
U1, Cl,
C4 out of
calibration.
DC
CURRENT
TEST
Input
does
not
affect display.
Fuse
FI,
F2,
CRl,
U4.
Displayed
reading
is
out
of
tolerance
on one or
more ranges.
R7, R8,
R9, U2,
RIO.
TEST
POINT
SIGNAL/CONNECTION
TEST
POINT
SIGNAL/CONNECTION
TP1
RMS
Converter
TPS
1
-VA
TP2
RMS Converter
Input
TP9
+VDD
TP3
Compensation
Network
Input
TPIO
+VA
TP4
A/D
Converter
HI Input
TP11
Range
control
input to
A/D
Converter
TPS
Digital
Reference for
A/D Converter
Range
TP12
DC
Reference
Voltage
TP6
COMMON
TP13
Used
with
the
-01
Option
(Battery
Charging
Circuit)
TP7
-vss
TP14
Used
with
the
-01 Option
(Battery
Charging Circuit)
4-10

Fluke 8010A Specifications

General

Brand	Fluke
Model	8010A
Category	Multimeter
Language	English