Fluke II Series - UUT Connection Guide (cont.); Amplified Current Output Connection

Maintenance
TROUBLESHOOTING
1.
Turn meter
on
Does meter power up?
NO
YES
2.
Meter powers
up, but
does not come out
of
self-test.
YES
NO
1
3.
Meter
comes
up with
missing segments.
YES
NO
X
4. Switch meter
to
V
and
NO
-
apply
3V dc. Does
meter display
3 VDC?
YES
r-J
5. Does
meter
autorange
NO
correctly?
YES
CHECK:
a
Power supplies
TP1 -3.1Vdc+/-0.1V
TP3-
1.5V dc
U1
pin 48
-
-6V
dc
(Battery voltage
-
TP
IV)
(If
any of
these voltages are high,low. or missing,
replacement of
U1
is usually
necessary)
b.
For
loose pins on U1/U2
c.
Battery Voltage
d.
SI for
bad
contacts
e.
VR1 lor 1.2Vdc
f. Shield
for short
to
Q3
g.
For solder debris/shorts
CHECK:
a.
For Loose pins
on
U1.
U2
b. For shorted C5,
6,
7,
or
8
c.
Contacts of SI
d. For
shorted pins on U1/U2
e. Y1
Frequency
@
32.768 kHz
CHECK:
a LCD
for cracks
b. For
contaminated display interconnects
or display
contact areas
c.
For loose pins on
U2
d.
For cracks in U2 package
e.
Junction of
R11 &
12 for 1.6V
dc.
PROBABLE
CAUSE:
a
R1
open
b.
RV1 or
RV2
shorted
c.
SI
Contacts bad
d.
Z1
Open or
out of
tolerance
e. U1
bad
f. U1
locsa'sborted
pins
PROBABLE
CAUSE:
a U1 bad
b. SI bad
PROBABLE CAUSE:
Apply 3V@ 500
Hz.
Does
meter
display
3 VAC?
NO
a U1
bad (also check for loose or shorted pins)
b.
SI bad
c. C9. C11 shorted
—-J
7. Switch meter to
£HK
Apply 100
ohms. Does
the
meter display
100&?|
NO
YES
x
8. Switch meter
to
A.
NO
-
Apply 300 mA dc. Does
meter display
300DC?
YES
i
9. Switch meter to
Does beeper sound
when leads
are shorted?
NO
PROBABLE
CAUSE:
a R1 open
b. El shorted
c.
Si
bad
d. Q1.
02
shorted
e.
Loose pins on
U1
,
U2
f.
U1
bad
PROBABLE CAUSE:
a FI, F2 open
b.
Si bad
c. R7open
d. Open
land patterns in current path
CHECK:
a
Connector contact
points
b.
For
correct signal at contact
points. Should
be
4.1 kHz
waveform. (If above
checks are good. LSI replacement
is
necessary.)
Figure
3-3.
Troubleshooting
Tree
3-10