ESI 250-DA - Troubleshooting Chart for Power Supply and Generator Issues

6.
2.
2
TROUBLE
SHOOTING
CHART
(cont.
iii)
SYMPTOM
PROBABLE
CAUSE
PROCEDURE
Line
fuse
blows
instantly
when
power
switch
is
turned
ON
Defective
filter
capaci-
tors
Check
capacitors
and
^115
possible
snort
to
ground;
replace if
neces-
sary
Defective
rectifier
Check
all
rectifiers
for
possible
short
to
ground;
replace
if
necessary
Power
transformer
de-
fective
Check
windings
for
pos-
sible
short
circuit;
re-
place
if
necessary
Some
tube
filaments
fail
to
light
Tubes
defective
Check
continuity
of
fila-
ments;
replace
defective
units
Broken
filament
lead
Check
circuit
continuity
and
repair if
necessary
Failure
of
1
0
volt
(dc)
supply
Defective
selenium
recti-
fier
(CRjq^)
Check
forward
and
back
resistance
of
rectifier;
replace
if
necessary
Defective
10 volt
trans-
former
winding
Check
continuity
of 10 volt
winding;
replace
trans-
former
if
necessary
Failure
of
270
volt
(dc)
supply
Defective
filter
capaci-
tors
Check
capacitors
and C,
,
c
possible short
lib
circuit
to
ground;
replace
if
necessary
Defective
selenium
recti-
fiers
(CRjqj
and CR^q^)
Check
forward
and
back
resistance
of
rectifiers;
replace
if
necessary
Open
transformer
winding
Check
continuity
of high
voltage
transformer
wind-
ing;
replace
transformer
if
necessary
No
dc
generator
output
Wrong
switch
setting
used
Recheck
switch
positions
Defective
switches
Check
switch
continuities;
replace
if
necessary
lelsl
i
I
250-DA 6/59