JVC LT-37X688 Service Manual page 30

4.7 ADJUSTMENT PROCEDURE
4.7.1 VIDEO CIRCUIT [TV-MICRO SERVICE MODE]
Measuring
Item
instrument
WHITE Remote
BALANCE control unit
(HIGHLIGHT)
Signal
generator
4.7.2 MTS CIRCUIT [DIGITAL SERVICE MODE]
Measuring
Item
instrument
MTS INPUT Remote
LEVEL control unit
MTS TV audio
SEPARATION multiplex
signal
generator
Oscilloscope
Remote
control unit
L-Channel
signal waveform
1 cycle
1-30 (No.YA535)
Test point Adjustment part
[1.Adjust]
S002: R DRIVE (Red drive)
S003: G DRIVE (Green drive)
S004: B DRIVE (Blue drive)
Test point Adjustment part
[1.Adjust]
A001: IN LEVEL
R OUT [1.Adjust]
L OUT A002: LOW SEP
[AUDIO OUT] A003: HIGH SEP
R-Channel
crosstalk portion
Minimum
Description
(1) Receive a NTSC 75% all white signal.
(2) Set "VIDEO STATUS" to "STANDARD".
(3) Set "ASPECT" to "FULL".
(4) Select "COLOR TEMPERATURE" to "LOW".
(5) Select the 1.TV-Micro Service from the
SERVICE MODE.
(6) Select the 1.Adjust.
(7) Adjust to keep one of <S002> (Red drive),
<S003> (Green drive) or <S004> (Blue drive)
unchanged, then lower the other two so that the
all-white screen is equally white throughout.
NOTE:
Set one or more of <S002>, <S003> and
<S004> to "137".
(8) Check that white balance is properly tracked
from low light to high light. If the white balance
tracking is deviated, adjust to correct it.
(9) Press the [MUTING] key to memorize the set
value.
Description
(1) Receive any broadcast.
(2) Select the Digital Service from the SERVICE
MENU.
(3) Select the 1.Adjust.
(4) Select the <A001> (IN LEVEL).
(5) Set the initial setting value of <A001>.
(6) Press the [MUTING] key to memorize the set
value.
(1) Input the stereo L signal (300 Hz) from the TV
audio multiplex signal generator to the antenna
terminal.
(2) Connect an oscilloscope to R OUT pin of the
AUDIO OUT, and display one cycle portion of
the 300 Hz signal.
(3) Select the 2.Digital
SERVICE MODE.
(4) Select the 1.Adjust.
(5) Select the <A002> (LOW SEP).
(6) Set the initial setting value of <A002>.
(7) Adjust the <A002> so that the stroke element
of the 300Hz signal will become minimum.
(8) Press the [MUTING] key to memorize the set
value.
(9) Input the stereo R signal (3kHz) and change
the connection of the oscilloscope to L OUT pin
of the AUDIO OUT.
(10) Similarly adjust <A003> (HIGH SEP).
(11) Press the [MUTING] key to memorize the set
value.
Service from the