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(12) Loosen the deflection-yoke fixing screw
(13) Slowly move the deflection yoke forward until the
screen becomes a uniform green field and temporarily
fix it at that position.
(14) If the screen is not uniform in green, readjust the
deflection yoke forward and backward a little.
{15) After step (14), if still it is not uniform, repeat step {1 O)
through (14).
(16) Receive the 33.750kHz Cross Hatch Pattern signal.
( 17) Adjust the VAS (Vertical Raster Shift) magnet to
equalize the pin cushion distortion of the top and that of
the bottom on the screen.
{18) Fix the deflection yoke after adjusting.
(19) Reset the value of A-GAIN and B-GAIN to the original
value written down before with the A-GAIN and B-GAIN
buttons.
Convergence Adjustment
D-P.C. Board
1. Equipment to be used
RGB Signal Generator: Cross Hatch Pattern
RGB input
2.
Initial
conditions
LANDING:
CENTER
PICTURE:
STANDARD
Adjustment Mode: Normal Mode
3.
Adjustment
Procedures
( 1) Receive a 33. 750kHz Cross Hatch Pattern signal.
(2)
Slowly open the knobs of 4-pole convergence magnet
and match the A and 8 vertical line at the screen
center.
(3} Turn the whole 4-pole convergence magnet and match
the
R
and
B
horizontal line.
(4) Slowly open the knobs of 6-pole convergence magnet
and match the A, B, and
G
vertical line at the screen
center. (At this time, the R and B line move at the same
time.)
(5) Turn the whole 6-pole convergence magnet and match
the R, B, and G horizontal line.
(6) If the picture is not uniform in color, adjust the purity.
-
37 -
•. ·.-
·--
, •.. I
DT-M3050W
\
~ate
Or"O\
\
~ate
oo~ena,\
(A)
(B)
4-pole convergence magnet
(C}
(D)
6-pole convergence magnet
Match R and B.
Match
R
and B to G.
(7) Loosen the deflection yoke fixing screw a little and
adjust the deflection yoke vertically and horizontally
for good overall convergence.
R+B'~•'R
B
G'·····-·----- _________
.
.,J.-
---l-------~----
-•-----•-•••~9.
B'
::
'R
R,:'G\B
Vertical Direction
B-------:-... ___ _
~
....... , ... ···-
f!GB
BGR
··-··--'··--
.•. R
•
--·--:
.~
Horizontal Direction
(8)
Adjust differential
coil
XV,
the gun-revolution
compensating coil, YH1
VA,
and YH2 VR for good
overall convergence.
(9) If the adjustment margin of YH1 VR and YH2 VR is
lacking for step (8), adjust the deflection yoke vertically
to extend the margin. At this time, be careful not to get
the pin cushion distortion worse at the screen top and
bottom.
(10) If the screen center part has a bad convergence,
repeat step (2) through (9).
( 11) Press the SCAN button of the remote control unit, and
the underscan screen will appear.
Differential Coil
XV
D===O
Gun-Revolution.--------~
Compensating
ra
Coil
WYV
YH2
YH1
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