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DT-M3050W
Color Center Line
I
H Blanking Period
TPV53 Waveform
SECAM Color Output Adjustment
(Y, V-P.C. Board)
1.
Equipment to be used
NTSC Signal Generator: SECAM Color Bar Pattern
VIDEO input
Oscilloscope:
TPKB, TPKG - TPY6 {GND}
2. Initial conditions
TV SYSTEM:
AUTO or SECAM
PICTURE:
STANDARD
Adjustment Mode: Adjustment Mode 1
3.
Adjustment
Procedures
(1) Receive a SECAM Color Bar Pattern signal.
(2) Connect an oscilloscope between TPKB - TPY6 (Y-P.C.
Board).
(3) Adjust SECAM BOUT 2 VR (R628 on V-P.C. Board)
to
equalize amplitude "A" of the TPKB waveform and
amplitude "D" of it.
A
B
C
TPKB Waveform
(4) Change the connection of the oscilloscope
"+"
side to
TPKG.
(5} Adjust SECAM ROUT 2 VR (R631 on V-P.C. Board) to
equalize the yellow level of the TPKG waveform and
the cyan level of it.
Yellow
Cyan
\I
Equalize these levels.
TPKG Waveform
Purity Adjustment
1.
Equipment
to
be
used
RGB Signal Generator: Cross Hatch Pattern
Black and White Pattern
RGB input
2. lnltial conditions
LANDING:
CENTER
PICTURE:
STANDARD
Adjustment Mode: Adjustment Mode 1
3. Adjustment
Procedures
( 1) Operate the set over 60 minutes.
(2) Fully degauss the picture tube with an external
degaussing coil.
(3) Set the purity and convergence magnets in position as
shown in the following figure.
63mm
25mm
Deflection
Yoke
~Ls-Pole
L
Convergence
Magnet
4-Pole
Convergence
Magnet
VAS Magnet
Purity Magnet
(4) Receive a 33.750kHz Cross Hatch Pattern signal.
(5) Adjust the convergence magnets and deflection yoke
for good convergence.
{6} Receive a 33.75kHz Black and White Pattern signal.
(7) Loosen the deflection-yoke fixing screw.
(8) Slide the deflection yoke backward and temporarily fix it
while adjusting the picture inclination.
(9) Check the value of R-GAIN and B-GAIN by pressing the
A-GAIN and B-GAIN buttons of the remote control unit
and write down them.
(10) Minimize the value of A-GAIN and B-GAIN by adjusting
the A-GAIN and B-GAIN buttons.
(11) Adjust the purity magnet to center the green field left to
right on the screen.
~
I
I
Purity Magnet
Green field is moved horizontally
by changing the opening degree
of the purity magnet.
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36 -
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