JVC AV-48P775/H Service Manual page 58

4.6.6 AUDIO (MTS) ADJUSTMENT
Measuring
Item
instrument
MTS INPUT Remote
LEVEL control unit
check
MTS TV audio
SEPARATION multiplex
adjustment signal
generator
Oscilloscope
Remote
control unit
L-Channel
signal waveform
1 cycle
1-58 (No.YA173)
Test point Adjustment part
[1.PICTURE/SOUND]
A01 : IN LEVEL
AUDIO OUT [1.PICTURE/SOUND]
L output A02: LOW SEP.
R output A03 : HI SEP.
R-Channel
crosstalk portion
Minimum
Description
(1) Select 1.PICTURE / SOUND from SERVICE MENU.
(2) Select < A01 > (IN LEVEL).
(3) Verify that < A01 > is set at its initial setting value.
(1) Input stereo L signal (300Hz) from the TV audio
multiplex signal generator to the antenna terminal.
(2) Connect an oscilloscope to L OUTPUT pin of the
AUDIO OUT, and display one cycle portion of the
300Hz signal.
(3) Change the connection of the oscilloscope to R
OUTPUT pin of the AUDIO OUT, and enlarge the
voltage axis.
(4) Select < A02 > (LOW SEP.).
(5) Set the initial setting value of < A02 >.
(6) Adjust < A02 > so that the stroke element of the
300Hz signal will become minimum.
(7) Change the signal to 3kHz, and similarly adjust
< A03 > (HI SEP.).
(8) Press [MUTING] key to memorize the set values.