ESI 250-DA - Troubleshooting Chart for Inaccurate Readings and Power Issues

6.2.2
TROUBLE
SHOOTING
CHART
(cont.
ii)
SYMPTOM
PROBABLE
CAUSE
PROCEDURE
Bridge
inoperative
for
inductance
and
capaci-
tance
measurements
(cont.
)
Open,
shorted,
or
defective
resistor
Check
resistors
R-4
through
R-lOandR-21,
R-24
for
open
and
shorted
circuits
,
and for rated values
Faulty
LRC
decade
-
rheostat
Check
R-11
through
R-20
and
R-26
for
continuity
and
for
accuracy of
resist-
ance
values corresponding
to
settings of the LRC dial
Faulty
capacitor
C-2
Check capacitor
C-2
for an
open
or shorted
circuit,
for
leakage, and
for proper
value
Readings
inaccurate
Rheostat
improperly
calibrated
Recalibrate
LRC
decade
-
rheostat R-11
through
R-20
and
R-26.
Also D aind
Q
rheostats
R-21, R-24
and
R-25
Power
indicator
lamp
fails
to
light
No
ac
line
voltage Trace
failure in ac power
source
Null
-amplifier
gain con-
trol
knob
is
not
positioned
correctly
Reset control
knob so white
dot is
at OFF
when
control
shaft is at
extreme left
position
Fuse
defective
Replace with l/2 amp
fuse
Power
indicator
lamp
burned
out
Replace
with
No.
47 bulb
AC
power
switch
defect-
ive
Check
and replace if neces-
sary
Power
cable
defective
Repair or replace
cable
Power
transformer
defective
Check for continuity
of fila-
ment
winding; replace
trans-
former
if necessary
fe
l
s)
1
1
250-DA
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