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Sencore PS163 - COIL and TRANSFORMER TEST; TEST OF FLY-BACK TRANSFORMER; USING THE PS163 WITH A SWEEP GENERATOR

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COIL
and
TRANSFORMER
TEST
Shorted
turns
and
defective
coils
can
be
located
by
a
shock
exciting
technique.
A
good
coil
with
a
high
Q
will
produce
a
damped
wave
effect
on
the
scope
screen.
A
defective
coil
will
have
less
of
a
damped
wave.
Follow
the
procedure
below,
with
Fig.
20
to
test
the
flyback
transformer
in
a
television
receiver.
TEST
OF
FLY-BACK
TRANSFORMER
TO
SWEEP
OUTPUT
ON
REAR
OF
PS
3
CHANNEL
A
PROBE
HORIZ.
alles
OUTPUT
-==
Fig.
20.
Connections
for
transformer
ringing
test.
1.
Connect
the
SWEEP
OUTPUT
signal
from
the
rear
of
the
PS163
through
a
100pf
capacitor
to
the
plate
lead
from
the
High
Voltage
Rectifier.
2.
Connect
the
CHANNEL
A
input
to
the
plate
lead
from
the
High
Voltage
rectifier
and
the
ground
lead
to
the
plate
lead
from
the
Horizontal
Output
tube.
3.
Usethe
FREE
RUNNING
HORIZONTAL
SWEEP,
and
set
the
TIME
BASE
-
FREQUENCY
switch
to
.lmSec/DiV.
The
pattern
produced
by
a
good
flyback
transformer
is
shown
in
Fig.
21
A.
Note
the
length
of
the
damped
wave.
The
pattern
produced
by
a
flyback
transformer
with
a
shorted
turn
is
shown
in
Fig.
21
B.
Note
the
much
shorter
length
of
the
damped
wave.
The
test
for
the
horizontal
winding
of
the
deflection
yoke
is
similar
to
the
flyback
test.
1.
Unplug
the
yoke
from
the
chassis
and
connect
the
SWEEP
out
signal
and
the
CHANNEL
A
input
to
the
high
side
of
the
horizontal
deflection
winding.
2.
Connect
the
ground
lead
to
the
low
side
of
the
winding
and
set
the
TIME
BASE
-
FREQUENCY
switch
to
10uSec/DIV.
The
indication
for
a
good
and
bad
yoke
are
similar
to
the
results
shown
in
Fig.
21A
&
B.
te
عه
س󰾯
an
aa
ain
8
f
f
Fig.
21A.
Waveform
of
good
transformer.
Fig.
21B.
Rapid
decrease
in
oscillations
in-
dicate
defective
transformer.
USING
THE
PS163
WITH
A
SWEEP
GENERATOR
Use
the
60
cycle
position
of
the
TIME
BASE
-
FRE-
QUENCY
for
sweep
generators
not
equipped
with
a
horizontal
sweep
signal.
Interupt
the
blanking
on
the
sweep
generator
and
adjust
the
LINE
SWEEP
PHASE
control
to
superimpose
the
trace
and
retrace
patterns.
Use
the
EXT
position
of
the
TIME
BASE
-
FRE-
QUENCY
for
sweep
generators
equipped
with
a
hor-
izontal
sweep
signal.
In
this
mode
the
LINE
SWEEP
PHASE
control
have
no
effect
on
the
pattern,
and
the
phase
control
on
the
sweep
generator
is
adjusted
to
superimpose
the
trace
and
retrace
patterns.
Fig.
22
shows
the
ideal
response
of
the
IF
amplifiers
in
a
modern
color
receiver.
The
color
carrier
(42.17
MHz)
and
the
video
carrier
(45.75MHz)
are
at
the
50%
points
on
the
curve,
and
are
directly
across
from
each
other.
The
adjacent
channel
video
carrier
(39.75
MHz),
the
co-channel
sound
carrier
(41.25MHz)
and
23

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