JVC AV-27F476 Service Manual page 26

Measuring
Item
instrument
SUB Remote
CONTRAST control unit
4.8.5 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
1-26 (No.YA243)
Test point Adjustment part
[1.V/C (S)]
S02: PICTURE
Test point Adjustment part
[3.SOUND (A)]
A01: IN LEVEL
R OUT [3.SOUND (A)]
L OUT A02: LOW SEP.
[AUDIO OUT] A03: HI SEP.
R-Channel
crosstalk portion
Minimum
Description
(1) Receive any broadcast.
(2) Select the 1.V/C (S) from the SERVICE MODE.
(3) Select < S02 > (PICTURE).
(4) Set the initial setting value of < S02 >.
(5) If the contrast is not the best with the initial setting
value, make fine adjustment of the < S02 > until you
get the optimum contrast.
Description
(1) Receive any broadcast.
(2) Select the 3.SOUND (A) from the SERVICE MODE.
(3) Select the < A01 > (IN LEVEL).
(4) Set the initial setting value of < A01 >.
(1) Input the stereo L signal (300 Hz) 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 300 Hz
signal.
(3) Select the 3.SOUND (A) from the SERVICE MODE.
(4) Select the < A02 > (LOW SEP.).
(5) Set the initial setting value of < A02 >.
(6) Adjust the < A02 > so that the stroke element of the
300Hz signal will become minimum.
(7) Change the connection of the oscilloscope to L OUT
pin of the AUDIO OUT, and enlarge the voltage axis.
(8) Change the signal to 3 kHz, and similarly adjust
< A03 > (HI SEP.).