akira CT-21DS9A, Руководство по обслуживанию

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Model No: CT-21DS9A_21DS9CP_21DS9CP(IKD)_21DS9CP(SKD)_21DS9N_21DS9R
Version 1.0
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9. COLOR PURITY ADJUSTMENT
9.1. Before color purity adjustment, Warm up the TV set over 15 minutes and fully degauss.
9.2. Receive pure white signal in AV status and set the TV receiver dynamic.
9.3. Go to factory mode “MENU2”. After write down the values of R-BIAS and B-BIAS, set the
values of R-BIAS and B-BIAS zero.
9.4. Loosen the clamp screw of the deflection yoke and pull the deflection yoke towards color purity
magnetic loop.
9.5. Adjust color purity magnetic loop to make the green area at the center of CRT screen.
9.6. Slowly push the deflection yoke toward the front of CRT and set it where a uniform green field is
obtained. Tighten the clamp screw of the deflection yoke.
9.7. Restore the values of R-BIAS, G-BIAS and B-BIAS
10. CONVERGENCE ADJUSTMENT
10.1. Receive a dotted pattern. Set the TV receiver dynamic.
10.2. Loose the convergence magnet clamper and align red with blue dots at the center of the screen by
rotating (R, B) static convergence magnets.
10.3. Align Red/Blue with green dots at the center of the screen by rotating (RB-G) static convergence
magnet.
10.4. Remove the DY wedges and slightly tilt the deflection yoke horizontally and vertically to obtain
the good overall convergence. Fix them after the good overall convergence is obtained.
10.5. Fix the convergence magnets by turning the clamper.
10.6. If purity error is found, follow “PURITY ADJUSTMENT” instructions.
Purity Magnet
RB-G RB
Magnet Clamper
Static Magnet
(C) FINAL INSPECTION AND ELECTRICAL FUNCTIONAL CHECK
1. CHECKING THE ELECTRICAL FUNCTION:-
1.1. Connect the power cord and connect the signal to RF input.
1.2. Check the power supply whether OK or not. Switch on the TV set and the LED is on. Switch off
the TV screen and should not have CRT spot within 3 sec.
1.3. Receive the channel 1 for monoscope pattern to check the picture focus and the round circle
should not be distorted. The centre position, and VOS line/size are within spec. Check the
brightness, contrast and colour condition. Check the convergence, picture must be clear, focus