Fluke 8024B - Page 81

8024B
Table
4-6.
Troubleshooting
Guide
TEST
AND
SYMPTOM
POSSIBLE
CAUSE
INITIAL
PROCEDURE
BT
is
displayed
when
unit
is
turned
on
|
Low
battery
voltage,
U18C,
U7,
(see
BT
procedure
also).
Note,
BT
will
}
U8
normally
be
displayed
for
some
line
voltages
when
the
A81
line
eliminator
accessory is used.
Display
blank.
Dead
battery,
POWER
switch
(S9),
VR2
shorted,
U8,
J5A
DISPLAY TEST
One
or
more
segments
will
not
light
through
entire
test.
Display
interconnection,
Display
(U9)
U8
U8
Decade
inoperative
or
one
or
more
seg-
ments
always
lit.
improper
decimal
point
indication.
Check
signals
at
U7.
Are
they
OK?
YES:
Display
(U9).
NO:
Range
switches
or
intercon-
nect.
U8
PEAK
HOLD
switch
is
at
the
ON
position
(if
you
pushed
toward
the
left
to
set
the
PEAK
HOLD
switch
to
the
OFF
position,
the
switch
is
still
at
the
ON
position),
VR1,
U8,
Y1,
C6
shorted,
or
inter-
connect.
Minus
sign
improperly
displayed.
Display
lit
but
does
not
respond
to
changes
in
input.
VOLTAGE TEST
DC:
Display
reading
is
out
of
tolerance
on
200
mV
range.
DC
CAL
(R6)
out
of
calibration,
VR1
U5,
U8,
S8
U1, U2, U3
Display
readings
out
of
tolerance
on
all
ranges
except
200
mV.
AC: Display
reading
out-of
tolerance
onthe
2V
range
with
1.9V
acrms,
5
kHz,
input.
AC
CAL
(R4)
out
of
calibration,
AC
Converter
Display
readings
out
of
tolerance
on
j}
U1
all
ranges
except
the
200
mV
range.