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JVC AV-27BM3

JVC AV-27BM3
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AV-27BM3
AV-27CM3.
@
ADJUSTMENT
PROCEDURE
Measuring
:
ae
Hem
eens
He
Test
point
|
Adjustment
part
Description
eMAIN
CIRCUIT
B1
POWER
DC
voltmeter
|
TP-91
1.
Confirm
that
the
voltage
between
TP-91
and
TP-E
SUPPLY
check
Tp-E
(1)
(1)
is
DC
129.3V
+1.5v.
NOISE
(RF
AGC)
NOISE
VR
1.
Adjust
the
NOISE
VA
so
that
the
noise
appears
in
adjustment
(R135)
the
picture.
2.
Next
the
NOISE
VR
in
a direction
that
tho
noise
disappears
from
the
picture
and
stop
at
the
point
where
the
noise
has
disappeared
from
the
picture.
3.
Tur
to
another
charmiet
and
coniinn
that.ihere
are
no
abnormal
ities.
COLOR
SYNC,
Pattern
TP-54
C
FSC.
VR
1.
Receive
the
color
bar
signal.
adjustment
generator
(Fsc
FREE)
|
(R316)
2.
Use
ashorting
clip
or
other
means
to
connect
TP-61
and
@
pin
(9V
line)
of
10101.
Oscilioscope
®
pin
of
3.
Adjust
the
C
FSC.
VR
to
change
the
picture
from
(C101
color
stripes
to
still
color
bar.
(SV
line)
4.
Remove
the
connections
and
check
that
the
color
synchronization
does
not
deteriorate
on
any
of
the
channels.
-{
SEPARATION
TV
multi
VARIABLE
SEPARATION
VR
|
1.
Set
the
TV
multichannel
sound
signal
generator
for
adjustment
channel
sound
|
AUDIO
(R606)
generating
stereo
signal
and
output
signal
of
about
generator
OUTPUT
3kH2z
from
the
left
channel.
L&R
2.
Connect
an
oscilloscope
to
the
“L”
output
and
Oscilloscope
oblain
a
clear
view
of
i-cycle
portion
of
3kHz
waveforms.
3.
Change
connection
of
the
oscilloscope
to
the
“R”
output
and
expand
the
voltage
axis.
4.
Adjust
the
SEPARATION
VR
and
minimize
the
3kHz
crosstalk
portion.
1
cycle
L
+
Channel
signal
waveform
Minimum
R
-
Channel
crosstalk
portion
FOCUS
FOCUS
VR
1,
Adjust
the
FOCUS
VR
to
oblain
clear
pictures.
adjustment
{built
in
FBT)
2.
Check
that
pictures
have been
adjusted
to
optimum
appearance
in
both
center
and
peripheral
areas
of
the
screen.
(No.50718)
9

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