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JVC AV-48PRO Service Manual page 27

Rear projection television

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PICTURE TILT ADJUSTMENT
Thick area
Rotate R, G, B deflection yoke so that picture becomes hori-
Ba
Thin area
zon, then fasten screw.
nh
| [o™
Up
>
CENTERING ADJUSTMENT
1.
Stretch a thread between two center slots of screen edge
(top and bottom, left and right).
Rotate Focus VR counterclockwise to the just focusing.
Fix 2-pole magnet with adhesive.
Change test pattern to white cross-dot.
Rotate Focus VR to just a little right from optimum focus-
ing.
9,
Adjust 4-pole magnet for the. square dot.
[>
10. Rotate Focus VR counterclockwise for the just focusing.
11. Fix 4-pole magnet with adhesive.
12. Perform steps 1 to 11 for RED, GREEN and BLUE.
PNA
cA
E
see
2.
Select the adjustment mode. (See page 30.)
3.
Press TV/VIDEO button on the Remote Control to display
the white cross-bar.
Note:
1,
Before adjustment, displace previously red and blue of
convergence by Convergence Menu in Set Up Menu for
convenience.
|
">
-
Adjust G centering magnet so that the cross-bar pattern
RED | BLUE
center comes to screen center.
REEN
5.
Perform HEIGHT adjustment . (See page 34.)
:
6.
Perform VERT. LINEARITY adjustment.
(See
page 34.,
2.
This adjustment may be omitted due to design modifica-
7.
Perlorm WIDTH adjustment
(Soa page oe a
)
tion (Deletion of alignment magnet).
8. Check whole quality of green line,
.
3.
6-pole magnet is no adjustment. Set it to cancelled condi-
9.
Adjust R, B centering magnet so that the cross-bar pat-
fo.
tion:
tem center comes to screen center.
:
,DYNAMIC FOCUS PARABOLA ADJUSTMENT
1.
Connect oscilloscope (10:1 probe) to terminal #2 of T400
and ground. (See Fig. C)
T4099
«-PAI7
2.
Turn on the TV set and adjust L450 (POWER DEF BOARD)
L450
_TLN2168.
? L401
for the peak-to-peak value of parabola wave as shown
below.
[
47.5V + 1V (L450)
Fig. c
1H
No.51281
ar

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