JVC AV-48P777/H Service Manual page 43

4.7.5 MTS ADJUSTMENT [1. Digital Service]
Measuring
Item
instrument
MTS INPUT Remote
LEVEL control unit
adjustment
MTS TV audio
SEPARATION multiplex
adjustment signal
generator
Oscilloscope
Remote
control unit
L-Channel
signal waveform
1 cycle
Test point Adjustment part
[1.Adjust]
A001: IN LEVEL
R OUT [1.Adjust]
L OUT A002: LOW SEP
[AUDIO OUT] A003: HIGH SEP
R-Channel
crosstalk portion
Minimum
Input the stereo R signal
(3kHz) and change
Description
(1) Receiv any broadcast.
(2) Enter Digital Service [1. Adjust].
(3) Select the <A001> (IN LEVEL).
(4) Set the intal setting value of the <A001>.
(5) 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) Enter Digital Service [1. Adjust].
(5) Select the <A002> (LOW SEP).
(6) Set the initial setting value of the <A002> (LOW
SEP).
(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.
(No.YA455)1-43