Focus Adjustment; Purity Adjustment - Mitsubishi DPLUS 74SB -BKA Service Manual

(E) "SB MODE" White Balance Adjustment (Select the color Mode SB MODE)
1) Select the color mode "SB Mode".
2) Video signal off (0Vp-p), Adjust brightness to 0.1 cd/m
3) Change pattern to 50*50 green block, Adjust G.Gain control to Y=223 cd/m
4) Change pattern to 50*50 white block, Adjust R.Gain and B.Gain to x=283, y=297.
5) Change pattern to Full white, Brightness to Max.
Adjust "AB" of SB Mode to Y=103 cd/m
6) Brightness preset : Video Signal off (0Vp-p), Adjust Brightness to 0.1cd/m

11. Focus Adjustment

(A) Mode: No.16 (VESA 1024*768(75))
(B) Pattern: Green Crosshatch, Brightness just cut off, Contrast maximum.
(C) Adjust F1 VR of FBT (lower side VR) for the vertical line to become fine line.
(D) Adjust F2 VR of FBT (higher side VR) for the horizontal line to become fine line.
(E) Receive Focus adjustment pattern.
(F) Adjust F1 VR if vertical black line is not fall out.
(G) Adjust F2 VR if horizontal black line is not fall out.
(H) Use the video card "Trio64+", and receive Microsoft Excel "Work sheet" (1024*768(85)).
Make sure that there is no double line for horizontal at the center.
*Note: Focus adjustment must be finished at F1 VR.
FOCUS ADJUSTMENT PATTERN

12. Purity Adjustment

(1) Receive signal 14 (Cross hatch pattern).
(2) The CRT face should be facing east and degauss the entire unit by external degaussing coil.
(3) Make sure the single color purity.
If not, readjust CPC magnet and touch up using correction magnets.
2
.
The shape of black dot (1 dot) fall out.
The shape of black dot (2dots) fall out .
2
, contrast to Max.
Black dot is fall out
F1 VR
F2 VR
G2 VR
4-8
2
.
2
.
Focus VR