JVC LT-40X776/S Service Manual page 24

4.7.2 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
1-24 (No.YA301)
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 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 ad-
just the < T003> (HI SEP).
(8) Press the [MUTING] key to memorize the set
value.