JVC LT-37X688 Service Manual

1-30 (No.YA535)
4.7 ADJUSTMENT PROCEDURE
4.7.1 VIDEO CIRCUIT [TV-MICRO SERVICE MODE]
4.7.2 MTS CIRCUIT [DIGITAL SERVICE MODE]
Item
Measuring
instrument
Test point Adjustment part Description
WHITE
BALANCE
(HIGHLIGHT)
Remote
control unit
Signal
generator
[1.Adjust]
S002: R DRIVE (Red drive)
S003: G DRIVE (Green drive)
S004: B DRIVE (Blue drive)
(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.
Item
Measuring
instrument
Test point Adjustment part Description
MTS INPUT
LEVEL
Remote
control unit
[1.Adjust]
A001: IN LEVEL
(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.
MTS
SEPARATION
TV audio
multiplex
signal
generator
Oscilloscope
Remote
control unit
R OUT
L OUT
[AUDIO OUT]
[1.Adjust]
A002: LOW SEP
A003: HIGH SEP
(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 from the
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.
L-Channel
signal waveform
R-Channel
crosstalk portion
Minimum
1 cycle

JVC LT-37X688 Specifications

General

Integrated clock	Yes
Comb filter	Digital
Display diagonal	37 \
Display brightness	500 cd/m²
Native aspect ratio	16:9
Viewing angle, horizontal	176 °
Analog signal format system	NTSC
HDCP	No
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
S-Video outputs quantity	1
Product color	Black
RMS rated power	20 W

Weight and Dimensions

Depth (without stand)	232 mm
Width (without stand)	927.1 mm
Height (without stand)	654.05 mm
Weight (without stand)	18280 g