Convergence Adjustment (1) - Sony PVM-9L1 Service Manual

2-10. Convergence Adjustment (1)

1. Input a dot pattern signal.
CONTRAST... Conspicuous position
BRIGHT... 0
2. Align the horizontal R, G, and B dots at the center of
the screen by adjusting RV701 on the C board. (H.
STAT ADJ.)
* When H-CENT is changed after H-STAT adjustment,
readjust H-STAT. (H-STAT will change by means of
H-CENT VR.)
3. Using V STAT Mg, align the top and bottom of R, G
and B on center of the screen. (Fig. 2-22, 2-23)
* After V-STAT adjustment, paint-lock the knob.
V-STAT Mg knob
While keeping the angles A and B equal (I = I'), align the
vertical convergence.
I
A
X
Fig. 2-22 Good example
If the A and B knobs are not symmetrical (I ≠ I'), the focus
may deteriorate, beam striking or other adverse effects may
occur.
A
X
Fig. 2-23 Bad example
PVM-9L1
I'
B
Y
I I'
B
Y
4. For HMC, use the six poles Mg to adjust the R and B
dots so that they will be symmetrical horizontally with
respect to the G dot. (Fig. 2-24)
I I'
A B
6-pole magnet
Change the opening
degree of the six poles Mg
to control the HMC.
Fig. 2-24
5. For VMC, use the six poles Mg to adjust the R and B
dots so that they will be symmetrical vertically with
respect to the G dot. (Fig. 2-25)
Do not change.
(Top)
(Bottom)
6-pole magnet
For VMC control, turn
knob to the right or left
without changing their
opening degree of the
six poles Mg.
Fig. 2-25
6. Repeat the adjustment steps from 2 through 5.
* The above adjustment may affect the landing, so after
adjustment, check the landing again.
7. Paint-lock the knobs after adjustment.
When the right convergence is not gotten even after
Convergence Adjustment (1), use the permalloy sheet to
adjust and fix the permalloy with RTV.
R G B
A A'
Control the six poles Mg so
that A=A'. Maintain I = I'
when moving the Mg.
R G B
Make adjustment so
that the gap will be the
same at the top and bottom.
2-9