Pioneer PX-7 Service Manual page 51

ex.
10.5
COLOR SUBCARRIER
SUPPRESSION
ADJUSTMENT
Adjusting with a vectorscope
1.
Switch
to
computer
mode
(by pressing the
COMP
key).
2.
Connect the vectorscope
as
indicated
in Fig.
10-9.
3.
Adjust
VR106
so that
the
origins
a
and
a'
of the
two
reflected burst vectors coincide with each
other
(see
Photo.
10-1).
Adjusting without a vectorscope (rough adjustment)
1.
Connect an
oscilloscope to the
VIDEO
OUT
terminals
with the
PX-7
in
computer mode.
Observe the video synchronizing
signal.
2.
Adjust
VR106
to
minimize
the
carrier
which
is
superimposed
on
the video synchronizing
signal
(see
Photo.
10-2).
Photo.
1
0-2
10.6
BLACK LEVEL ADJUSTMENT
1.
Press
the
SUPERIMPOSE
key
to switch to com-
posite
mode.
2.
Check
that the
external video
signal
output
level
lies
within the
lVp-p±10%
range.
3.
Adjust
VR105
to align
the
internal
black
level
shown
in
Fig.
10-10 with
the external pedestal
level
(center of switching
spike).
Photo. 10-1
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