JVC AV-27320 Service Manual page 27

ADJUSTMENT OF MTS CIRCUIT
Measuring
Item
instrument
MTS INPUT
LEVEL
check
MTS TV audio
SEPARATION multiplex
adjustment signal
gener ator
Oscilloscope
L-Channel
signal waveform
1 cycle
Test point Ad justment part
A01 IN LEVEL
R OUT A02 LOW SEP.
L OUT A03 HI SEP.
[AUDIO OUT]
R-Channel
crosstalk portion
Minimum
No. 51937
Description
1. Select the A01 IN LEVEL of the SOUND MODE.
2. Verify that the A01 IN LEVEL is set at its initial s etting value.
No . Setting item
A01 IN LEVEL
1. Input the stereo L s ignal (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 c ycle portion of the 300Hz signal.
3. Select the A02 LOW SEP. of the SOUND MODE.
4. Set the initial setting value of the A02 LOW SEP. with the
FUNCTION / key.
5. Adjust the A02 LOW SEP. so that the strok e element of the
300Hz signal will bec ome minimum.
6. Change the connection of the oscilloscope to L OUT pin of the
AUDIO OUT , and enlarge the voltage axis.
7. Change the signal to 3kHz, and similarly adjust the A03 HI
SEP.
Setting item
No .
A02 LOW SEP.
A03 HI SEP.
AV-27320
AV-27330
AV-27S33
Variable Initial setting
range value
0 ～ 15
012
Variable Initial setting
range value
0～63
039
0 ～ 63
016
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