Vertical Linearity Adjustment; Overall Image Distortion Check; Focus Adjustment; Static Convergence Adjustment - Sony Multiscan GDM-2036S Service Manual

(1) When right and left pincushion distortion is not
equal.
(2)
Adjust the PIN BAL to equalize right and left
amounts of distortion.
(3)
Adjust the PIN to make vertical lines be linear.
Fig. 6-3-19 Left and Right PIN Cushion
Distortion Adjustment Method
6-3-8. Vertical linearity adjustment
1) Adjust the V. LIN BAL data so that the vertical size of
the grid is symmetric with center.
2) Adjust the V. LIN data so that the vertical size of the grid
at the center is equal to the upper and lower portions of
the grid.
3) If the size of the grid cannot be adjusted once, repeat step
1) and 2) above.
Movement of V. LIN
Movement of V. LIN BAL
Fig. 6-3-20
6-3-9. Overall Image distortion check
1) Image size and image distortion must meet with the
conditions specified in Fig. 6-3-15.
2) Attach the linearity gauge (EIA ball-chart) to check that
each intersections of cross hatch is positioned within the
±
1 % deviation circles.
3) If there are any excess points out of circles, the monitor
should be adjusted again ..
GDM-2036S
6-3-10. Focus adjustment
Note: If the landing fine adjustment, picture size adjust-
ment, convergence fine adjustment, and white
balance fine adjustment are not complete, after
those adjustments are complete, adjust the focus
again
1) Input a character pattern (an E pattern is recommended)
by Mode 10. If the character pattern is not available, use
cross-hatch pattern.
2) Set the
I
CONTRAST
I
control to maximum.
3) Tum the V. FOCUS and H. FOCUS knobs to adjust the
screen focus. (Balance the focus at the center and on the
periphery.)
4) When the adjustment is complete, lock the knobs with
white paint.
1 dot-H-+
t
1 dot
Project the same
CJ~""S:lt:1t:EE
pattern all over
r::
the screen.
Fig. 6-3-21 E Pattern
6-3-11. Static convergence adjustment
Note: Since the CRTs SONY supplies for service have
already been adjusted, 1) - 6), 7) (j)-@. @. @
are not necessary.
1) Place the set in the Helmholtz coil. (IBv=0.45; 18.=0)
2) Input the white cross-hatch signal (mode 7).
3) Set the front control panel's H. STAT and V. STAT
controls to the center point.
4) Tum the H. STAT VR inside· the set to separate the red,
green and blue lines individually. Tum V. STAT (RV5)
on the N board to separate the red, green and blue lines
individually.
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