Hitachi 51SWX20B, Service Manual

Page: 38 / 189

DP27/27D
38
Adjustment procedure
(1) Receive any NTSC signal.
(2) Press the SERVICE ONLY SW on DEF./CONV.
PWB and POWER to display DCU uncorrected
converge data.
(3) Locate the horizontal size VR (R711 on
POWER/DEF PWB). Adjust horizontal size to
the table below.
Notes: (1) Once Normal mode Horizontal size adj. is
done. To restore old RAM data, turn TV off
and on.
(2) After adjustment, press SERVICE ONLY
switch to exit DCU crosshatch.
(3) H. SIZE adjustment is only done in
NORMAL MODE (NTSC).
=
NORMAL
MODE
51” 1020
57” 1140
65” 1300
Tolerance: ± 5mm
2.8 Horizontal size adjustment
Adjustment preparation
(1) The set can face east or west.
(2) Set video conditions to factory preset.
(3) The Static Focus adjustment should have been
coarse adjusted.
(4) Convergence should not be corrected.
(5) Start adjustment 20 minutes or more after TV is
turned on.
The 6th line
from center
Between the
vertical lines
at the left and
right end.
Units = millimeters
25.4mm = 1in.
2.6 Raster position adjustment
Adjustment preparation
(1) The set can face east or west.
(2) Input the single cross test signal.
(3) Set video conditions to factory preset.
(4) The static focus should have been coarse
adjusted.
(5) The digital convergence RAM should be cleared
(uncorrected state). With the TV set off, press
and hold the service switch located on the
DEF./CONV. PWB and then press the power
button.
(6) Start adjustment 20 minutes or more after TV is
turned on.
Adjustment procedure
(1) Turn the centering magnets for red, green, and
blue to satisfy the condition below. The red and
blue horizontal lines should match with green.
(RED) (BLUE)
51” 20 35
57” 20 35
65” 20 35
Tolerance: ± 2mm
1
2
Geometric
center of the
screen
R
B
(2) Upon completion of adjustment, fix centering
magnets with white paint.
NOTES: (1) If internal cross-hatch does not appear
after clearing RAM data, press service
switch again.
(2) To restore old RAM data, turn TV off and
on.
1 2
Notes: (1) If internal cross-hatch does not
appear after clearing RAM data,
press service switch again (on
DEF./CONV. PWB).
(2) To restore old RAM data, turn TV
off and on.
(3) V-Size is only done in NORMAL
mode (NTSC).
= NORMAL
MODE
51” 560
57” 625
65” 710
Tolerance: ± 5mm
2.7 Vertical size adjustment
Adjustment preparation
(1) The set can face east or west.
(2) Set video conditions to factory preset.
(3) Convergence should not be corrected.
(4) Start adjustment 20 minutes or more after TV is
turned on.
Adjustment procedure
(1) Receive any NTSC signal.
(2) Press the SERVICE ONLY SW on DEF./CONV.
PWB and POWER to display DCU uncorrected
convergence data.
Between the
horizontal lines
at the top and
bottom
(3) Locate the vertical size VR (R607) on
DEFLECTION PWB. Adjust the vertical size
according to the following table.
The 5th line
from center
Units = millimeters
25.4mm = 1in.
Units = millimeters
25.4mm = 1in.
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