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Focus Adjustment - Sony RM-785 Service Manual

Trinitron color video monitor.
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PVM - 3 2 3 0
A dj ust c o n v e rge n c e o f lower s c r e e n ce n t e r wi t h B.Y . B
m a g n e t VMC ( ve rt i c a l mi sc onve r g enc e ) c o rr ect i o n a n d
5 .
( 2) 4MC
R M - 7 8 5
e lect ro n i c beam mo v e m e n t
( R V 2 5 09 ) o n th e D2 board.
t i o n ( A )
V M C co r r ect io n ( 8 )
V M C co
rrec
'
,
'
,
L{ R V 2 5 0 9 )
U .
6 .
Adj u s t co n v e rg enc e s of e a c h sc re e n c o rn e r wi th
R. Y
,
,
. R . Y
'
( R V2 504 ) a n d B.L. Y
( R V 2 5 0 1 )
U . L. Y ( RV 2 5 0 2
) , B
,
C
25 0 3
n the D
) o
2 bo a rd .
I
( RV
0
*
= D
OG
D
C<D
G
D
O B
B
C
I
V
5
2
,-
--<--i
( R
)
' · ·
C
Puri ty
R
O R
V .STAT
E
S
/ 6
Pol e
0
): -
--i
-
M agnet
-
'
( R V 2
-
\
' -
0
- - (RV 2 5 0 1 )
2
-
, ,
-
'
'
,
I
1+------
(RV250 4 )
5
3
os
i
R��s
R
i
V25 03
v
R
© R Vl
S C 4
AV2
508
©
Y. B att
u
50 1
RV 2 5 0 2 ,:1t,
U
RV 2
O
U .L. Y
'JV
.
W
W U .
R
. Y
©
is
€})
©
l .
C o n firm
t h a t h o ri zonta l c o n v e rg e n c e of s c r e e n c e
e
YR on the
D2 B O A RD
ad j u ste d . lf no t , ad j u s t w it h H. S T A T
C board .
RL.Y
.. R
V2 �
RR. Y
2 .
Ad j u st co n v e r g enc e of left s
r
en c e n t e r
wi t h L.A
25 06
B . Y . 9
( RY
3 · 2 · 2 . Scr ee n Pe r i p h e r a l Co n v e rg e n c e
o n t h e D2 boa rd.
{D y n a m ic Conv e r genc e A d j us t m e n t )
nt
r
l .
Rec ei ve o n - a i r bro a dc a s t s i
c
)
al.
gn
e
2 .
SetBR!GH T N ESS and
SH A R
P NES S c o n t ro ls to " R
E T' '
ES
position a n d P
I C TUR E b u tt on to m a xi mu m .
3 .
3-3. F O C U S A DJUS T M E N T
Ad
ust wi t h FB I ( T 6 9 9 ) FOCUS VR
o n th e FB bo a rd .
A t t his time , if ad j u s t foc us o � l y a t scr e e n c e n t e r,
(
.,.
Ir
' \
rig
t sc
e
n cente r
R.
magenta ring ap p e a rs in t he c e n t e r. Adju s t' m a g e n t a ring n o t
3.
A d just co n v e rg e n c e of
( RV 2 5 0 6 ) --·�
w
A
}
to be outstandingly vis
le
r
_ � ..
( R V 25 05
) o n t he D
..,.
.
i b
.
2 b
j
,' '
... ,
h
ith
r
e
... _ _.,.
oard
)
Aftefremove t h e c o n n ector (C - 2 ) o n t h e C bo a r d , a p ply 17 0
l.
Y d c t o each cathod e of Red , G re e n an d Bl u e .
G2 , WH IT E BA LANC E ADJU S T MEN T
· 2 .
3-4 .
Adjust G2 VR
o a rd s o t h a t the tl y b a ck
( RV70 l } on t h e C b
4 .
A d j ust c o n v e rg e n c e of upper screen ce
ter with U.Y.B
m
stly d
sappears on the s c re e n .
: ,
--- - (R V 2 5 0 5 )
r
-4
( R V 2
) o n the D 2 bo a
.
- 1; 0 2 A d j u s t m ent
3
, _ _.,,
n
o
i
8
d
50
(RV 2 5 08)
t
)
33 ·· · · ·
P V M .. 3 2 3 0
,, ,,
M o no s cope pattern
,
-r-r ..- ...
,.
R e c e iv e the a n a l o g ROB s i g nal . S et BRI G HTNES S co n t r o l
R M - 7 8 5
l.
to "R E S ET" a n d PI CTU R E b u tt on t o m i n imum .
2 . Ad j us t w hite bal. a n c e w ith
bl u e cu t c off
(RV 7 0 3) a n d r e d
cu t - o ff (R V 7 05
. ·
)
3 .
Set PICTURE bu
to
to 7
% , and ad
white ba
with
3-4 - 2 . White Bala n c e A i:I J1.1 $ J !'l'l ent .. ,
n
j u s
0
lan
gr e en a n d blu e dr
v e VRs (RV l 4 0 ! , RV
1 40 2) .
4
fr
2
w
R
t
.
pe a t
to ste p 3 .
om s
ep
5 .
Re ce iv e a vi d eo
signal and set to all whi
e pattern, T
h e n
pr e s s con t ro l k ey a nd s e t D . C O L ( d yn a mic colo r)
on t h e
t
co nt r o l k e y pane l l o "O FF ".
t
ce
t
6 . S et BRIGH T N ES S c o n
i
r o l .t o "RESET" a nd
PI C T U R E
b u t t o n t o m i n i mu m.
e
A d j u s t G r e e n Bl ac k c o n t ro l (RV4 5 4 ) a n d Bl u e Bl ac k c o n t ro l
7.
t
th e c o lo r te m p e
r e . b e comes
o p t im u m
(R V 4 5 5 ) s o th a t
t
K) .
00
(93
utt on t o max
m u m a n
s et
S - B R
T
8 . S et PI
UR E b
CT
V R
board to mid- rotation.
( R V 70 9 ) o n th e C
.
Ad j u s t G . G A I N A D J V R ( R V456) a n d B . G A IN ADJ
9
Y R
V4 5 7 ) s o tha
t t
o
p
ra
becomes optim um
he c o l
r t e m
e
( R
ra
u
°
K ) .
(9300
lO . Repeat from step 7 to st
9 .
i
d
1
R
i
m
d
v e a
o n o s c o p e s ign a l , a n
s et P
o
7
.
ec e
IC T U R E but t
n t o
0
mi
mum a nd B R IGHTNESS co
t
ol to "R
SE T ".
IRE
i
12. A dj u st S -B RT YR
R V7 0 9 ) o n t he C bo a r d s o that O IRE
ture
1 0 0
(
S e c ond positi
po
s cu
and l O IRE
°
i
-
p o rt i o n obt a i n s th e fa in tly
I R E
n
fro m right
visib l e ra s t e r .
ep
1
n
n
r
E
rtion
t
off
o
CH R O M A O F F
( L u m i n a nce
ba r chart )
0
· - 34 -
R M - 785
P V M - 3 2 3 0
- . . 3 5 - -

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