JVC PD-35B50BJ Service Manual page 50

Measuring
Item
instrument
SUB-SCREEN
Remote control
A-D OFFSET
unit
Signal generator
WHITE Remote control
BALANCE unit
(HIGH LIGHT)
Signal generator
1-46 (No.YA098)
Test point Adjustment part
[1. ADJUST]
S001:PREPARE
(adjustment setting
mode change)
S016:RT CB OF
(Sub screen blue
offset)
S017:RT CR OF
(Sub screen red
offset)
S030:R DRIVE
(Red drice)
S031:G DRIVE
(Green drive)
S032:B DRIEV
(Blue drive)
Set the 0% block part to be brightest.
Fig. 11
[1. ADJUST]
S030:R DRIVE
(Red drive)
S031:G DRIVE
(Green drive)
S032:B DRIVE
(Blue drive)
Description
(1) Receive a PAL black and white pattern signal
(including 0% black signal).
(2) Set PICTURE MODE to "STANDARD".
(3) Set MULTI-PICTURE to "TWIN-PICTURE".
(4) Select "1.ADFJUST" from the SERVICE MENU.
(5) Set < S030 > (Red drive), < S031 > (Green drive) and
< S032 > (Blue drive) to set "255".
(6) Set < S001 > (adjustment setting mode change) to
set "017" and it change to the sub-screen A-D offset
adjustment setting mode.
(7) Set < S016 > (Sub-screen blue offset) to minimize the
blue noise in the upper half of the screen. (See Fig.11)
NOTE:
•
If you select an adjustment item < S016 >, then the
screen automatically turn to twin pictures mode.
(8) Set < S017 > (Sub-screen red offset) to minimize the
red noise in the upper half of the screen. (See Fig.11)
(9) Readjust < S016 > and < S017 > to set the upper half
of the screen to be the blackest. (See Fig.11)
(10) Adjust < S001 > to set "000" and it change to the normal
mode.
(11) Press the [MUTING] key to memorize the set value.
(1) Receive a PAL 75% all-white pattern signal.
(2) Set PICTURE MODE to "STANDARD".
(3) Set COLOUR TEMPERATURE to "NORMAL".
(4) Select "1.ADFJUST" from the SERVICE MENU.
(5) 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
set values "128".
(6) Check that white balance is properly tracked from low
light to high light. If the white balance tracking is
deviated, adjust to correct it.
(7) Press the [MUTING] key to memorize the set value.