JVC I'Art LT-37X987, Service Manual, Page: 15 / 207

(No.YA457)1-15
SECTION 4
ADJUSTMENT
4.1 ADJUSTMENT PREPARATION
(1) There are 2 ways of adjusting this TV : One is with the
REMOTE CONTROL UNIT and the other is the
conventional method using adjustment parts and
components.
(2) The adjustment using the REMOTE CONTROL UNIT is
made on the basis of the initial setting values. The
setting values which adjust the screen to the optimum
condition can be different from the initial setting
values.
(3) Make sure that connection is correctly made AC to AC
power source.
(4) Turn on the power of the TV and measuring instruments for
warning up for at least 30 minutes before starting
adjustments.
(5) If the receive or input signal is not specified, use the most
appropriate signal for adjustment.
(6) Never touch the parts (such as variable resistors,
transformers and condensers) not shown in the adjustment
items of this service adjustment.
4.2 PRESET SETTING BEFORE ADJUSTMENTS
Unless otherwise specified in the adjustment items, preset the
following functions with the REMOTE CONTROL UNIT.
4.3 MEASURING INSTRUMENT AND FIXTURES
• Signal generator (Pattern generator) [NTSC]
• TV audio multiplex signal generator
• Remote control unit
4.4 ADJUSTMENT ITEMS
„ VIDEO CIRCUIT
• WHITE BALANCE (HIGHLIGHT) adjustment
„ MTS CIRCUIT
• MTS INPUT LEVEL adjustment
• MTS SEPARATION adjustment
4.5 BASIC OPERATION OF SERVICE MODE
4.5.1 HOW TO ENTER THE SERVICE MODE
(1) Set to 0 minutes using the [SLEEP TIMER] key.
(2) Press the [VIDEO STATUS] key and [DISPLAY] key
simultaneously, then enter the SERVICE MODE (Fig.1)
Fig.1
NOTE:
• Before entering the SERVICE MODE, confirm that the
setting of TV/CATV switch of the REMOTE CONTROL UNIT
is at the "TV" side and the setting of VCR/DVD switch is at
the " VCR " side. If the switches have not been properly set,
you cannot enter the SERVICE MODE.
• When a number key other than the [1] keys is pressed in the
SERVICE MENU SCREEN, the other relevant screen may
be displayed.
This is not used in the adjustment procedure. Press the
[MENU] key to return to the SERVICE MENU SCREEN.
4.5.2 HOW TO EXIT THE SERVICE MODE
Press the [BACK] key to exit the Service mode.
4.5.3 SERVICE MODE SELECT KEY LOCATION
Setting item Settings
VIDEO STATUS STANDARD
BRIGHT / CONTRAST / COLOR / TINT 00
COLOR TEMPERATURE LOW
DIG. NOISE CLEAR OFF
COLOR MANAGEMENT ON
NATURAL CINEMA OFF
TREBLE / BASS / BALANCE 00
SMART SOUND OFF
MTS STEREO
A.H.S.+ OFF
MaxxBass OFF
ASPECT FULL
SERVICE MENU SERVICE MENU
1. ADJUST 1. ADJUST
2. SELF CHECK 2. SELF CHECK
3. I2C STOP 3. I2C STOP
SERVICE MENU SCREEN
INPUT
INDEX
ASPECT
FREEZE SWAP
SELECT
/TV
FAVORITE
THEATER
PRO
NATURAL
CINEMA
VIDEO
STATUS
SOUND
TV CATV VCR DVD
MUTING
MENU BACK
GUIDE
RM-C18G
REW
VCR CHANNEL
PREV NEXT
VCR DVD
POWER TV VCR
FF PLAY
REC PAUSE
OPEN CLOSE STILL PAUSE
STOP
CH
CH
VOL VOL
OK
MULTI SCREEN
SPLIT
POWER
SUB
CHANNEL
ML/MTS
SLEEP
DISPLAY
D/A
C.C.
TUNE
1
4
7
2
5
8
0
3
6
9
LIGHT
POWER
VCR/DVD switch
NUMBER
DISPLAY
TV/CATV switch
MENU
SLEEP TIMER
VIDEO STATUS
MUTING
C
CHANNEL -
VOLUME -
BACK