Pioneer PX-7 Service Manual page 52

10.7
SWITCHING
SPIKE ELIMINATION
ADJUSTMENT
1.
Switch
to
composite mode, and
observe the
VIDEO
OUT
terminal output
in
an
oscilloscope.
2.
Adjust
VR109
to
minimize
the switching spike
in
the
composite
video
signal (see Fig. 10-11).
Fig.
10-1
1
Switching
spike elimination
adjustment
10.8
HUE ADJUSTMENT
Proceed with
this
adjustment only
after
the
power
has
been
on
for at
least five minutes.
Adjusting with a vectorscope
1.
Press the
SUPERIMPOSE
key
to switch to com-
posite
mode.
2.
Enter the
COLOR
4,4,4 input,
and
press the
return
key
to obtain an
all-blue screen.
3.
Adjust
VR101
(0
~
0'
<
2°) so that
the blue
hue output
obtained
from
the computer
is
sym-
metrical
about
the
U
axis
as
indicated
in Fig.
10-13,
and
make
sure that the external
signal
burst
is
fully
coincident with the vectorscope
burst
point.
Adjusting
without a
vectorscope (rough adjustment)
1.
Press the
SUPERIMPOSE
key
to
switch
to
com-
posite
mode.
2.
Enter the
COLOR
4,4,4 input,
and
press the
re-
turn
key to obtain an
all-blue screen.
3.
Connect an
LD
to
VIDEO
IN, adjust
operating
mode
to
STILL, and
adjust
VR101
to
obtain a
stable
blue
color
in
that screen.
v
AXIS
Blue
(Internal signal)
v
52