Service manual
19SV11
'I
INSTALLATION
AND
SERVICE
INSTRUCTIONS
Note: (1) When
performing
any adjustments
to
resistor controls and transformers use
non-metallic screwdriver
or
TV
alignment
tools.
(2) Before
perfoming
adjustment,
TV
set must be on
at
least 15 minutes.
CIRCUIT
PROTECTION
The receiver is protected
by
a 4.0A fuse
(F701),
mounted
on
PWB-A,
wired
into
one side
of
the
AC
line
input.
X-RADIATION PROTECTOR CIRCUIT
TEST
After
service has been
perlormed
on
the
horizontal
deflection
system,
high
voltage
system,
or+
B
system,
the
X-
Radiation
protection
circuit
must
be
tested
for
proper
operation
as
follows:
1.
Apply
120V
AC
using a variac transformer
for
accurate
input
voltage.
2.
Allow
for
warm
up
and
adjust
all
customer
controls
for
norma
I
picture
and sound.
3.
Check
the
voltage
of
test
point
TP601.
(It's
voltage should be
about
18V
DC.)
4.
Connect
the
pin (6)
of
IC501
to
TP601
through
a short
clip
lead.
In
this
case,
the
operation
of
horizontal
oscillator
is
stopped.
5.
To
start
operation,
remove
the
above short clip
lead and
touch
the
TP602
to
chassis
ground
(TP603)
with
a
short
clip
lead. In
this
case
remove
short
c I i p I ead
as
soon
as
the
set
operates again
with
a normal picture.
6.
Connect
TP651
to
TP652
and
see
that
the
operation
of
horizontal
oscillator
then
stops.
Next, make sure
that
the
set operates
with
a
normal
picture
by
the
method
of
StepS.
7.
If
the
operation
of
the
horizontal
osc.
does
not
stop in steps 4
and
6,
the
circuit
must
be
repaired
before
the
set
is
returned
to
the
customer.
8
HIGH
VOLTAGE
CHECK
High voltage
is
not
adjustable
but
niust
be checked
to
verify
that
the receiver
is
operating
within
safe
and
efficient
design
limitations
as
specified checks
should be
as
follows:
1.
Connect an accurate
high
voltage
meter
to
the
CRT
anode.
2.
Operate receiver
for
at
least
15
minutes
at
120V
AC
line voltage,
with
strong
air
signal
or
a
proper I y
tuned
in test signa
I.
3.
Set SW851
on
PWB-B
to
"OFF"
(center)
position.
Note
that
I
o.ss
of
I u m i nance
wi
11
occur.
4.
Rotate Screen control (on T652)
to
minimum
(CCW)
end
of
its rotation.
5.
The reading
sho.uld
be
approximately 26.5kV
at
zero beam.
If
a correct reading cannot be
obtained,
check
circuitry
for
malfunctioning
components.
Upon
completion
of
voltage
check,
readjust
screen control
for
proper
operation
and set
SW851
to
"ON"
position.