JVC GX-N7E - Page 18

pe
|
item
|
z
Test
point
and
Adjustment
part
Description
Hq
instrument
Measuring z
jo, Item instiurment Test point and Adjustment part Description
j
i i It aring on the ]
1.)
TARGET.
|
Oscilloscope
R313
(TARGET)
Ae
Sate
es
display
voltage
appearing
ICKU .
vee,
(ana)
a
LEER
eC
HVBORRE!
(Confirmation
is
facilitated
by
demounting
SETTING
:
BOARD]
a
switching
regulator.)
PRESETTING
2.
Observe
Point
@)
shown
in
Fig.
2-1
(a)
and
A
|
To
obtain
if
a
picture
is
not
obtained,
preset
the
follow-
measure
cathode
voltage
ee
pK
ee
a
picture
ing
VRs
as
indicated.
(Waveforms
shown
in
Fig.
observable.)
e@
PRE
PROCESS
BOARD
ke—
1H
—+|
R12 (Y GAIN) > Mechanical center.
| @ AGC BOARD
if R26 (Y KNEE) ~ Turn fully counter-
i clockwise.
R43
(CHROMA
LIMITER)
VK
: > Turn fully counterclockwise. ae
CHROMA
Le
F
Vv
Fig.
2-1
(b)
LIMITER
A
a
yGain|
*
ENCODER
BOARD
:
{about
7V)
7
RO4
(Y
SET
UP)
+
Mechanical
center.
;
3,
Measure
(B14)
and
adjust
R313
(TARGET)
Y
SETUP
Y
KNEE
Wily
so
that
voltage
becomes
“pickup
tube
\f
a
picture
is
already
obtained
or
fine
adjust-
display
voltage
+
cathode
voltage
(Vk).”
ment is to be made later, presetting is not 7 zi
|
necessary.
-
|
2.]
Rough
Oscilloscope
R215
(LIGHT
©
Close
the
tris
[Eee rare eae q LEVEL
qooe
nnn
fe
-
293+
ef
eno
a+
--------
-
+--+}
+--+
-
-----------
--+-+-
Adjustment
H-rate
[PRE-PRO
in
Fig.
2-2,
adjust
R215
(LIGHT
B
Syeone
HBLCOMP-Y
VRs_
|
Before
performing
deflection
adjustments,
|
of
the
1:1
BOARD]
[MOTHER
BOARD}
|
*
(eve.
-
ie
oe
level
incellatio i indi TA: ,
E
ou.
—
IPREPRE
VBLCOMP-Y
VAs.
|
Preset
the
following
VRs
as
indicated,
:
pate
matches
the
blanking-period
level.
Board]
LIGHT
&® PHASE SH COMPVRs 1. Measure G12) at the H-rate and adjust
the H BL COMP-Y VRs to obtain flat
[CM
Board]
waveforms.
Signal
pariod'—-|
H
BL
COMP-R
VRs
2.
Measure
at
the
V-rate
and
adjust
Blanking
period
H BL COMP-B VRs the V BL COMP-Y VRs to obtain flat Fig. 2-2
SH
COMP-R
VRs
waveforms:
2
eee
[DET
Board]
SH
COMP-B
VRs
3.
Measure
at
the
H-rate
and
adjust
the
3.|
Rough
Oscilloscope
R305
(FOCUS)
©
Set
the
IRIS
SWITCH
to
AUTO
1D
VBLCOMP-8
VR:
PHASE
SH
COMP
VAs
to
obtain
flat
Adjustment
|
/H-rate
prepre
(DEF
&
HV
BOARD]
waveforms.
i
M
and
adjust
R305
(FOCUS)
so
E
V
BL
COMP-R
VRs
-
Jofthe
10:1
RD]
1.
Measure
:
{B. SET Board] 4. Measure (017) at the H-rate and adjust FOCUS and BOA that the waveforms are maximized and
POINT
@
DY.
FOCUS
VRs
the
H
BL
COMP-R
VRs
to
obtain
flat
phase
Sines
become
clearly
observable,
as
[MOTHER
Boara]
[MOTHER
BOARD]|
waveforms.
once
VIDEO
OUT
ROB
(Y-B
CARR.
aly
Foe
ines
Mi
5,
Measure
at
the
H-rate
and
adjust
ROG
(R-Y
CARR.
BAL.
the H BL COMP-B VRs to obtain fist [AGE BOARD)
waveforms.
‘4
sa
tea
ey,
ts
a
adjust
the
SH
COMP-R
VRs
to
obtain
i
flat
waveforms.
Fig.
2-3
(a)
7. Measure at the H- and V-rate, and , FF)
adjust the SH COMP-B VRs to obtain cea loe AES
flat
waveforms.
‘aun
atetaiemanblyaanist
8. Measure €16) at the V-rate and adjust 1. Measure VI pol iaaiete
POINT (A) the V BL COMP.B URe to obtain flat ROB (Y-B CARR. BAL.) and R06 ee
waveforms,
CARR.
BAL.)
so
that
the
carriers
aré
MOTHER
BOARD
9.
Measure
at
the
V-rate
and
adjust
minimized
as
shown
in
Fig.
2-3
(b).
the V BL COMP-R VRs to obtain flat
* As to th KVR mh : waveforms.
che ch OROIUSTHIENS TOeK. 10. Measure POINT @® at the H- and V-rate,
:
and
adjust
the
DY.FOCUS
VRs
to
obtain
Fig.
2-3
(b)
TIONS”.
fl
tL
i at waveforms. i
14E (No. 5550)
(No. §550) 13E