JVC I'Art Palette PD-42V475, Service Manual

Page: 30 / 192

1-30 (No.YA099)
WHITE
BALANCE
(HIGH LIGHT) [1. ADJUST]
S030:R DRIVE
(Red drive)
S031:G DRIVE
(Green drive)
S032:B DRIVE
(Blue drive) (1) Receive a NTSC 75% all-white pattern signal.
(2) Set VIDEO STATUS to “STANDARD”.
(3) Set COLOR TEMPERATURE to “LOW”.
(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 “133”.
(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.
Remote control
unit
Signal generator
Item
Measuring
instrument
Test point Adjustment part Description
MTS INPUT
LEVEL [1.ADJUST]
T001:IN LEVEL
(MTS input level) (1) Receive a NTSC colour bar signal (400 Hz).
(2) Set AUDIO OUT to “FIX”.
(3) Set SMART SOUND to “OFF”. [PD-42V485/S]
(4) Select “1.ADJUST” from the SERVICE MENU.
(5) Verify that the <T001> (MTS input level) is set at its
initial setting value.
(6) Press the [MUTING] key to memorize the set value.
Remote control
unit
Signal generator
MTS
SEPARATION [1.ADJUST]
T002:LOW SEP
(MTS low
separation)
T003:HIGH SEP
(MTS high
separation) (1) Receive a stereo L signal (300Hz) from the TV audio
multiplex signal generator to the antenna terminal.
(2) Set MTS to “STEREO".
(3) Set AUDIO OUT to “FIX".
(4) Set SMART SOUND to “OFF". [PD-42V485/S]
(5) Connect the oscilloscope to AUDIO L OUT, and display
one cycle portion of the 300Hz signal.
(6) Change the connection of the oscilloscope to AUDIO
R OUT, and enlarge the voltage axis.
(7) Select “1.ADJUST" from the SERVICE MENU.
(8) Set < T002 > (MTS low separation) so that the stroke
element of the 300Hz signal will become minimum.
(9) Receive a stereo R signal (3kHz) from the TV audio
multiplex signal generator to the antenna terminal.
(10) Set < T003 > (MTS high separation) so that the stroke
element of the 3kHz signal will become minimum.
(11) Press the [MUTING] key to memorize the set value.
Remote control
unit
TV audio
multiplex
signal generator
Oscilloscope
AUDIO L OUT
AUDIO R OUT
L-Channel
signal waveform R-Channel
crosstalk portion
Minimum
1 cycle
Fig. 8