Hitachi 46F500A, Service Manual

Page: 51 / 162

51
DP33KA/B
2.12 Digital convergence adjustment
Note: 1. If replacing a PRT, DY, etc. perform auto-
digital convergence first. (Press front panel
MAGIC FOCUS switch). This can eliminate
the need for a complete digital convergence
alignment.
2. To enter digital convergence adjustment
mode without removing the front speaker
grill, please do the following:
1) Press “Magic Focus” button on the front
panel.
2) While “Magic Focus” is running, press
Magic Focus button again to “Stop”.
3) Press INFO button after “STOP” OSD
appears on the screen to enter digital
convergence mode.
4) Proceed with convergence adjustment
and save the data.
5) Do MAGIC FOCUS sensor initialization.
6) To exit, press POWER button on the front
panel.
Adjustment preparation
(1) Receive an RF or video signal.
(2) Set controls to factory preset.
(3) Install jig screen on the set.
(4) Note the center of the video pattern displayed.
This is necessary to match dotted lines
(adjustment point viewed) and actual point that
is adjusted and displayed by the video signal.
(5) Press the service only switch (on DEF./CONV.
PWB). The pattern displayed is now the digital
convergence mode.
(6) When performing a complete digital
convergence adjustment CLEAR DATA in RAM.
(With the TV set off, press and hold the service
switch located on the DEF./CONV. P.W.B. and
then press the POWER button).
Adjustment procedure
(1) Red and blue static focus adjustment. Adjust
the static focus VR on Focus pack (UFPK) so
that the center of circle pattern is the most clear.
Check that the focus does not get conspicuously
worse at the edges of the circle pattern signal or
cross-hatch signal.
(2) Green static focus adjustment. Adjust the static
focus VR on Focus pack (UFPK) (for green) so
that the center of circle pattern is the most clear.
Check that the focus does not get conspicuously
worse at the checking point, the periphery of
circle pattern cross-hatch signal.
NOTE: Checking point for the periphery of picture.
Checking point
O I
L
NOTE: Setting to the center between purple and
crimson is optimum.
(7) After all colors have been adjusted, display all
colors with the cross-hatch pattern signal and
check the focus performance.
(8) Then, select the circle pattern signal and check
the focus performance of each color and all
colors together.
(9) If the focus performance is not acceptable re-
adjust step (1) to (6).
2.11 STATIC FOCUS ADJUSTMENT
Adjustment preparation
(1) LENS FOCUS adjustment should be finished.
(2) Contrast : MAX
Brightness : Center.
(3) Receive the circle pattern signal.
(4) Apply covers to the lens of the colors you are not
adjusting and project only one color on the
screen.
OPTICAL FOCUSING ADJUSTMENT BLUE
CHASSIS DP33W
SCREEN SIZE 46”
L1 and L2
(PITCHES from CENTER) 5.0
BETWEEN
L1&L2 *
COLOR *
ABERRATION I 3.0mm MAX
*
O 3.0mm MAX
(NOTE) * Slightly reddish or no color
** Slightly greenish or no color
BACK TO ADJUSTMENTS
Adjustment Point