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'
4
'
PVM-1 440QM/1 442QM/1
444QM
I
MATRIX
ADJUSTMENT
(RV006,
RV007)
[
5-2.
XA BOARD ADJUSTMENT
1.
Receive
a
color-bar
signal.
/white
peak
:
75%
^
black
level
:
0%
chroma max.
:
75%
\chroma
min.
:
0%
/
2.
CONTRAST
70%
3.
Connect an
oscilloscope
to
pin
©
(B
OUT)
of
A-1
5.
4.
Adjust
RV006
(B-Y)
so
that
the
BLUE
OUT
wave-
form
becomes
flat
as following
figure.
I
cyan
magenta
5.
When
there
is
difference
between
cyan
portion
and
magenta
portion,
adjust
with
RV006
while tracking
with
PHASE
volume
for
user
control.
6.
Connect an
oscilloscope
to pin
©
(R-Y)
of
A-1
5.
7.
Adjust
RV007
(R-Y)
so
that the
RED
OUT
wave-
form
becomes
flat
as following
figure.
Red
0UT
.
I
within
I
i=j
—
~
1
r
0.2
Vr>p
(COMPONENT
SIDE)
-
COLOR SYNCHRONIZATION
(CW)
ADJUSTMENT
(CV3,
CV4)
1.
Short-circuit pins
©
and
($
of
IC301
on
A
board.
2.
Connect
pin
©
of
IC311
on
A
board
to
+12
V
line
via
4.7
kQ
resistor.
3.
Short-circuit
base
and
emitter of
Q416
on
A
board.
4.
3.58
MHz
Adjustment (CV3)
(1)
Receive
a
color-bar signal
(EIA
color-bar)'.
(2)
Adjust
CV3
the color synchronization.
Adjust so
that color
stripes
disappear
and
the
hue change
is
stabilized
extremery.
5.
4.43
MHz
Adjustment (CV4)
(1)
Receive
a
color-bar
signal
(EBU
color-bar).
(2)
Adjust
CV4
the color synchronization.
6.
Remove
the
short-circuit
positions pins
®
and
<$
of
IC301
and base and
emitter
of
Q416.
CAUTION
:
This
adjustment
(XA
board
adjustment)
should be
made
earlier
than
all
adjustments
of
color.
21
-
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