Focus Adjustment; Deflection Circuit Picture Adjustment - Hitachi 35UX85B/CZ68 Service Manual

A6LXU
1.3 Focus Adjustment
NO.
MODEL CPT Condition
1 1 1 35UX85B 1 A89AGFll X10
6th 2nd
h 4
l
Receive the cross-hatch signal
l
Contrast Control: Maximum
0 Sharpness Control: Center
l
Brightness Control: Center
Focus VR Setting Position
a) Turn the Focus VR (F2) gradually to adjust
6th vertical line becomes best.
b) Turn the Focus VR (Fi) gradually to adjust
center horizontal line becomes best.
c) Turn to Item (a)/(b) again and finish.
6th
1.4.2 Vertical Size Adjustment (R631)
Adjustment Preparation
Screen
1.4 Deflection Circuit Picture Adjustment
1.4.1
Horizontal Center Picture Adjustment (R759)
Adjustment Preparation
(1) Receive circle pattern signal or cross-hatch signal.
(Cross-hatch signal: 20 vertical lines, 14 horizontal lines.)
Set CONTRAST control to maximum and BRIGHTNESS
control to center.
Adjustment Procedure
(1) Adjust H. Center VR (R759) so that the difference of the
horizontal size markers of the circle pattern at the right
and left end are within 0.5.
(2) If using the cross-hatch signal, vary R759 so that the
difference of the far left and right vertical lines at the
screen edges are within 0.25 of a cross-hatch.
(1) The TV set should face North or South.
(2) Receive circle pattern signal or cross-hatch signal.
(Cross-hatch signal: 20 vertical lines, 14 horizontal lines.)
Set CONTRAST control to maximum and BRIGHTNESS
control to center.
Adjustment Procedure
(1) Adjust V. size VR (R631) so that the outer circle pattern is
like figure.
Note: Perform this adjustment more than 5 minutes after
applying the power ON.
i) When the picture center is below CPT center.
Adjust so that l/2 of the width of outer circle comes to
the screen.
*If using the cross-hatch signal, adjust so that the top
and bottom of the screen edge is 7.25 cross-hatch
away from the exact center of the cross-hatch signal.
ii) Standard condition
Adjust so that the inner circle comes in contact with the
top and bottom of the screen.
*If using the cross-hatch signal, adjust so that the top
and bottom of the screen edge is 7 cross-hatch away
from the exact center of the cross-hatch signal.
iii) When the picture center is above CPT center.
(1) When the picture center is O-2 mm above CPT
center, adjust so that the bottom of the inner circle
comes in contact with the TOP of the screen.
*If using the cross-hatch signal, adjust so that the
top and bottom of the screen edge is 7 cross-hatch
away from the exact center of the cross-hatch
signal.
15