JVC AV-20D304/SA Service Manual page 23

AV-20D304
3.6.7 MTS CIRCUIT
Measuring
Item
instrument
MTS INPUT Remote
LEVEL control unit
No Setting item
A01 IN LEVEL
MTS TV audio
SEPARATION multiplex
Signal
generator
Oscilloscope
Remote
control unit
L-Channel
signal waveform
1 cycle
No Setting item
A06 LOW SEP
A07 HI SEP
1-22 (No.52103)
Test point Adjustment part
[3.SOUND(A)]
A01 : IN LEVEL
Variable Initial setting
range value
0~63 036
R OUT [3.SOUND(A)]
L OUT A06 : LOW SEP
[AUDIO OUT] A07 : HI SEP
R-Channel
crosstalk portion
Minimum
Variable Initial setting
range value
0~63 008
0~63 026
Description
(1) Select the <A01>(IN LEVEL) of the 3.SOUND.
(2) Verify that the <A01> is set at its initial setting value.
(1) Input the stereo L signal (300Hz) from the TV audio
multiplex signal generator to the antenna terminal.
(2) Connect an oscilloscope to R OUT pin of the AUDIO
OUT, and display one cycle portion of the 300Hz
signal.
(3) Select the <A06>(LOW SEP) of the SOUND MODE.
(4) Set the initial setting value of the <A06> with the
[VOLUME (-/+)] key.Adjust the <A06> so that the
stroke element of the 300Hz signal will become
minimum.
(5) Change the connection of the oscilloscope to L OUT
pin of the AUDIO OUT, and enlarge the voltage axis.
(6) Change the signal to 3kHz, and similarly adjust the
<A07>(HI SEP).