JVC LT-26X575/KA, Руководство по обслуживанию

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1-24 (No.YA179)
4.7.2 MTS CIRCUIT
WHITE
BALANCE
(HIGHLIGHT) Remote
control unit
Signal
generator
[1.ADJUST]
S030: R DRIVE (Red drive)
S031: G DRIVE (Green drive)
S032: 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 "1.ADJUST" from the SERVICE MODE.
(6) 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 "255".
(7) Check that white balance is properly tracked
from low light to high light. If the white balance
tracking is deviated, adjust to correct it.
(8) Press the [MUTING] key to memoirze the set
value.
Item
Measuring
instrument
Test point Adjustment part Description
Item
Measuring
instrument
Test point Adjustment part Description
MTS INPUT
LEVEL Remote
control unit
Signal
generator
[1.ADJUST]
T001: IN LEVEL (1) Receive the any broadcast.
(2) Select "1.ADJUST" from the SERVICE MODE.
(3) Verify that the < T001 > (IN LEVEL) is set at its
initial setting value.
(4) Press the [MUTING] key to memorize the set
value.
MTS
SEPARATION TV audio
multiplex
signal
generator
Oscilloscope
Remote
control unit
L OUT
R OUT [1.ADJUST]
T002: LOW SEP
T003: HI SEP (1) Input the stereo L signal (300Hz) from the TV
audio multiplex signal generator to the antenna
terminal.
(2) Connect an oscilloscope to L OUT pin of the
MONITOR OUT, and display one cycle portion
of the 300Hz signal.
(3) Change the connection of the oscilloscope to R
OUT pin of the MONITOR OUT, and enlarge the
voltage axis.
(4) Select "1.ADJUST" from the SERVICE MODE.
(5) Set the initial setting value of the < T002 > (LOW
SEP).
(6) Adjust the < T002 > so that the stroke element
of the 300Hz signal will become minimum.
(7) Change the signal to 3kHz, and similarly adjust
the < T003> (HI SEP).
(8) Press the [MUTING] key to memorize the set
value.
L-Channel
signal waveform R-Channel
crosstalk portion
Minimum
1 cycle