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4.7.3 VIDEO CIRCUIT
Measuring
Item
instrument
WHITE
Remote
BALANCE
control unit
(HIGHLIGHT)
Signal
generator
4.7.4 MTS CIRCUIT
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
1-38 (No.YA337)
Test point
Adjustment part
[1.ADJUST]
S001: R DRIVE (Red drive)
S002: G DRIVE (Green drive)
S003: B DRIVE (Blue drive)
Test point
Adjustment part
[1.ADJUST]
T001: IN LEVEL
L OUT
[1.ADJUST]
R OUT
T002: LOW SEP
T003: HI SEP
R-Channel
crosstalk portion
Minimum
Description
(1) Receive a NTSC 75% all white pattern.
(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) Adjust to keep one of < S001 > (Red drive),
< S002 > (Green drive) or < S003 > (Blue
drive) unchanged, then lower the other two
so that the all-white screen is equally white
throughout.
NOTE:
Set one or more of < S001 >, < S002 >, and
< S003 > to "128".
(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.
Description
(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.
(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
AUDIO OUT, and display one cycle portion of
the 300Hz signal.
(3) Change the connection of the oscilloscope to
R OUT pin of the AUDIO 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.
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