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Deflection Yoke Neck Rotation Adjustment; Convergence Adjustment (2) - Sony PVM-20M2U Service Manual

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*
The above adjustment may affect the landing, so after adjust-
ment, check the landing again.
7. Paint-lock the knobs after adjustment.
3-7.
Deflection yoke neck rotation adjustment
1. If there is nonconvergence on both sides of the X or Y axis of the
screen, turn the neck of the deflection yoke in the direction of
the arrow to hold the nonconvergence for the entire CRT screen
within the tolerance.
*
Applicable only to groups of models 1, 2, 3, and 5.
( 1)
Reverse cross
misconvergence pattern
(2) Regular cross misconvergence
pattern
Move the deflection yoke ~ Move the deflection yoke
t
downward.
upward.
BGR
RGB
R
~:::,
~.:r.r
::::~
G
0
B
o-···
...
,':\
eo a
RGB
Fig. 3-18
(3) Pattern of left-sided
deflection yoke
B
G
R
B
~)
~,:f.,?
---··
G
0
~:::g
R
.
.. ...
.
'.
doe
BGR
Fig. 3-19
(4)
Pattern of right-sided
deflection yoke
R
G
B
Move the deflcetion
__..
Move the deflection .......
e - -
yoke to the right when
yoke to the left when
viewed from the CRT
viewed from the CRT
screen.
screen.
H H H H
R B
B R
B R
R B
Fig. 3-20
Fig. 3-21
3. Insert the wedge between the deflection yoke and CRT funnel to
lock the deflection yoke. (Fig.3-24)
Groups of models
Group of models 4 have
1
,2,3,and
5
have been
been treated.
treated.
Fig.3-24
4. The following patterns cannot be corrected by turning the neck.
(Figs.3-25, 3-26, and 3-27)
RGB
* Gun rotatuon
R •·-.
G
g::)
B
~,f.?
'.•.'
0
--·• B
:: ... o
G
··--o
R
The X-axis andY-axis
beams are distorted on
both sides.
it\
,'
:
\
e6o
RGB
G
(G)
(G) G
0 0 0
0 0 0
R
B
Gg RB
(G)O
(G)g RB
GO
R
B
Fig. 3-25
* HCR Large( Small)
The horizontal portion of
ttB
G raster is wider(narrower)
than that of the RB raster on
both sides of the screen.
Fig. 3-26
*VCR Large(Small)
The vertical portion of the
G raster is wider( narrower)
than that of the RB raster on
both sides of the screen.
Fig. 3-27
2 zone
3-8. Convergence adjustment (2)
Fig.3-23
2. Tum the neck of the deflection yoke to align the V pin vertically.
*
Applicable only to group of models 4.
YCH
XCV
ITJB
TLV
YBH
G
G=o-----------------
ITJJ/
GR
•••••••••••••••••·
\
8
~
AGe
TLH
9~
Fig. 3-28 Convergence compensation VR,coil,and
compensator
-22-

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