JVC PD-Z50DX4/S Service Manual page 28

Measuring
Item
instrument
SUB SCREEN Remote
A-D OFFSET control unit
Signal
generator
Set the 0% block part to be brightest.
VIDEO-1 TV(RF)
<NO SIGNAL> <30% all white>
WHITE Remote
BALANCE control unit
(HIGHLIGHT)
Signal
generator
1-28 (No.YA229)
Test point Adjustment part
[1.ADJUST]
S001: PREPARE
(Adjustment setting mode change)
S016: RT CB OF
(Sub screen cb offset)
S017: RT CR OF
(Sub screen cr offset)
S030: R DRIVE(Red drive)
S031: G DRIVE(Green drive)
S032: B DRIVE(Blue drive)
[1.ADJUST]
S030: R DRIVE (Red drive)
S031: G DRIVE (Green drive)
S032: B DRIVE (Blue drive)
Description
(1) Set "PICTURE MODE" to STANDARD.
(2) Set "ZOOM" to FULL.
(3) Set "WHITE BALANCE" to MID.
(4) Set "MULTI SCREEN" to 2 pictures.
(5) Receive a PAL 30% all white pattern signal on
the Right screen. At the same time, set the Left
screen in VIDEO-1 mode (No signal).
(6) Select "1.ADJUST" from the SERVICE MODE.
(7) Set < S030 > (R DRIVE), < S031> (G DRIVE)
and < S032 > (B DRIVE) to "133".
(8) Set < S001 > (adjustment setting mode change)
to set "17" and it change to the sub screen A-D
offset adjustment setting mode.
(9) Adjust < S016 > (Sub screen cb offset) to
minimize the blue noise in the upper half of the
screen.
If you select an adjustment item < S016 >,
then the screen automatically turn to twin
pictures mode.
(10) Set < S017 > (Sub screen cr offset) to minimize
the red noise in the upper half of the screen.
(11) Readjust < S016 > and < S017 > to set the
upper half of the screen to be the blackest. (See
Fig.9)
(12) Set < S001 > to set "0" and it change to the nor-
mal mode.
(13) Press the [MUTING] key to memoirze the set
value.
(1) Receive a PAL 75% all white signal.
(2) Set "PICTURE MODE" to STANDARD.
(3) Set "ZOOM" to FULL.
(4) Set "WHITE BALANCE" to MID.
(5) Select "1.ADJUST" from the SERVICE MODE.
(6) Adjust to keep one of < S030 > (Red drive),
< S031 > (Green drive) or < S032 > (Blue drive)
unchanged, then lower the other two so that the
all-white screen is equally white throughout.
NOTE:
Set one or more of < S030 >, < S031 >, and
< S032 > to "85".
(7) Check that white balance is properly tracked
from low light to high light. If the white balance
tracking is deviated, adjust to correct it.
(8) Press the [MUTING] key to memoirze the set
value.