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Convergence Adjustment (1) - Sony PVM-20M2U Service Manual

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Note : Attach NTC magnets for 20M4 to the locations shown in
Fig.3-l3.
6-pole Mg
(upper position)
Install the each magnets up and down.
Fig. 3·13
3-6. Convergence adjustment (1)
1. Input a dot pattern signal.
CONT ... Conspicuous position
BRT ... MIN
2. Align the horizontal R, G, and B dots at the center of the screen
with the H-START YR.
"' When H-CENT is changed after H-STAT adjustment, readjust
H-STAT. (H-STAT will change by means of H-CENT YR.)
3. Align the vertical location of R, G, and B in the center of the
screen with theY-STAT Mg. (Fig.3-l4, 3-15)
*
After Y-STAT adjustment, paint-lock the knob.
Y-STAT Mg knob
While keeping the angles A and B equal (I
=
1'), align the verti-
cal convergence.
X
y
Fig. 3·14 Good example
If the A and B knobs are not symmetrical (I
*
1'), the focus may
deteriorate, beam striking or other adverse effects may occur.
y
Fig. 3-15 Bad example
4. For HMC, use the BMC Mg to adjust the R and B dots so that
they will be symmetrical horizontally with respect to the G dot.
6-pole magnet
Change the opening
degree of the BMC Mg
to control the HMC.
R
G
B
~·+··r
Control the BMC Mg so
that A=A'. Maintain 1=1'
when moving the Mg.
Fig. 3-16
5. For YMC, use the MBC Mg to adjust the R and B dots so that
they will be symmetrical vertically with respect to the G dot.
', Do not change.
',,
...
../
ifQ)\
6-pole Mg
For VMC control, turn
knob to the right or left
without changing ther
opening degree of the
BMCMg.
(Top)
(Botton)
R
G
0
0
Make adjustment so
that the gap will
be
the
same at
the
top and botton.
Fig. 3-17
6. Repeat adjustments 2. to 5.
-21-

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