JVC AV-27F704/BSA Service Manual page 53

4.7.6 MTS CIRCUIT
Measuring
Item
instrument
MTS INPUT Signal
LEVEL generator
Remote
control unit
MTS TV audio
SEPARATION multiplex
signal
generator
Oscilloscope
L-Channel
signal waveform
1 cycle
1-36 (No.52113)
Test point Adjustment part
R OUT [3.SOUND (A)]
[AUDIO OUT] 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 the cross-hatch signal (cross-hatch /
400Hz)
(2) Enter the SERVICE MENU.
(3) Select the < A01 > (IN LEVEL) of the 3.SOUND (A).
(4) Verify that the < A01 > is set at its initial setting value.
(5) Connect the signal generator to R OUT pin of the
AUDIO OUT.
(6) Adjust the MTS input level to 500mV(rms) by < A01 >.
Adjustment item Initial setting value
A01: IN LEVEL
(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) Enter the SERVICE MENU.
(4) Select the < A02 > (LOW SEP.) of the 3.SOUND (A).
(5) Set the initial setting value of the < 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 3kHz, and similarly adjust
the < A03 > (HI SEP.).
Adjustment item
A02: LOW SEP
A03: HI SEP
10
Initial setting value
32
32