JVC GX-N7E

(No. 5550) 21€
Measuring
‘ .
|
‘
mI
No.
Item
i
ins
aa
Test
point
and
Adjustment
part
Description
INo.
Item
p=
|
Test
point
and
Adjustment
part
|
Description
|
+———
-
5.|Y
GAIN
Oscilloscope
|
VIDEO
OUT
R12
(Y
GAIN)
©
Shoot
the
gray
scale
pattern
and
set
the
|
oc
Oscilloscope
|
VIDEO
OUT
R24
(DC
SET)
Adjustment
procedure
with
oscilloscope
|
]
Adjustment
(es)
[PRE-PRO
BOARD]
Iris
to
obtain
0.4V0B-we
at(B8
).
BALANCE
va)
{C.
M.
BOARD]
10:1
Adjustment]
\
10:1
nee
1,
Adjust
R12
(Y
GAIN)
so
that
the
waveform
magne
ttt
oto8
at
VIDEO
OUT
becomes
0.7
VPD-wP.
2.
Adjust
R24
(DC
SET)
to
minimize
the
Gray
scale
noise
component
of
the
waveform.
pattern
|
Vectorscope
|
VIDEO
OUT
Fig.
35
:
:
1.
Close
the
iris.
(Note)
The
crossing
point
lies
at
approx.
57%
2.
Adjust
R24
(DC
SET)
to
minimize
the
blue
portion
of
the
carrier
on
the
vector-
7]
Tf
scope.
6.
Set
Oscilioscope
|
VIDEO
OUT
R26
(Y
KNEE)
©
Set
the
Iris
for
a
value
of
0.9
V
~
1
VPD-wP
‘
Adjustment
(—.
[AGC
BOARD]
at
VIDEO
OUT.
>
Beene
7
a,
10:1
4
x
wie”
~
1.
Adjust
R26
(Y
KNEE)
so
that
the
wave-
a
form
peak
are
compressed
to
0.77VPD-we,
)
Pree.
Gray
scale
,
E>
7
eas
pattern
‘
|
/
/
es
ee
!
Fig.
3-8
(b)
fan
PHASE
_|
Oscilloscope
Gs)
y.g)
RO1(PHASE
SET-1)
[©
Set
the
IRIS
CONTROL
SWITCH
to
AUTO
SET
nee)
R12
(PHASE
SET-2)
:
a
Adjustment
10:1
(RY)
T4
(GROUP
DELAY)
|
1.
Shoot
the
white
pattern
and
set
Ri
[ENC
BOARD]
([C.M.
BOARD]
(GROUP
DELAY)
fully
in
the
direction
that
KA)
|
GROUP
causes
the
monitor
image
to
become
darkest
blue.
Fig.
3-6
DELAY
:
;
2.
Set
R12
(PHASE
SET-2}
to
the
mechani-
see
cal
center.
A
ern
GROUP
DELAY
3.
Simultaneously
measure
I5
)
(Y-B)
and
7,
ee
mea
VIDEO
OUT
R213
(IRIS
SET)
©
Set
the
IRIS
SET
SWITCH
to
AUTO.
C6>(R-Y),
and
obtain
the
ADD
mode.
Adjustment
Cay)
[MOTHER
BOARD]
4.
While
causing
R332
(H
LIN-1)
to
vary
by
.
_
leshe
1.
Adjust
R213
(IRIS
SET)
so
that
the
+30°,
adjust
TO1
(GROUP
DELAY)
and
fe
ie}
waveform
becomes
0.7V
Po-we
(+
0.021V).
R12
(PHASE
SET-2)
so
that
movement
of
See
the
added
waveforms
is
minimized
as
shown
Gray
scale
Ke
oe
ea
a
ae
in
Fig.
3-9.
pattern
re
ke
|
ss
kK
|
Lay
a
fi
PO
=
<
>
|e
=
a
1
:
g
PHASE
SET-1
Fig.
3-9
(a)
Fig.
3-7
|
A
22E (No. 5550)