JVC AV-27F713 Service Manual page 30

AV-27F703
AV-27F713
AV-27F803
ADJUSTMENT OF MTS CIRCUIT
Measuring
Item
instrument
MTS INPUT Sophometer
LEVEL
Ad justment
MTS TV audio
SEPARATION multiplex
adjustment signal
gener ator
Oscilloscope
L-Channel
signal waveform
1 cycle
30
Test point Ad justment part
AUDIO A01:IN LEVEL
OUT R pin
R OUT A02:LOW SEP.
L OUT A03:HI SEP.
[AUDIO OUT]
R-Channel
crosstalk portion
Minimum
1. Receive the cross-hatch signal (c ros s-hatch / 400Hz)
2. Enter the SERVICE MENU.
3. Select the A01:IN LEVEL of the 3:SOUND(A) MODE.
4. Verify that the A01:IN LEVEL is s et at its initial setting value.
5. Connect the sophometer to AUDIO OUT R pin.
6. Adjust the MTS input level to 500mV(rms) by A01:IN LEVEL
with remote c ontrol unit.
7. Press the EXIT key to return to the SERVICE MENU screen.
No . Setting item
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 c ycle portion of the 300Hz signal.
3. Enter the SERVICE MENU.
4. Select the A02:LOW SEP. of the 3:SOUND(A) mode.
5. Set the initial s etting value of the A02:LOW SEP. with the
FUNCTION ( / ) key.
6. Adjust the A02:LOW SEP. so that the stroke element of the
300Hz signal will bec ome minimum.
7. Change the c onnection 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.
9. Press the EXIT key to return to the SERVICE MENU screen.
Setting item
No .
A02 LOW SEP.
A03 HI SEP.
No.52005
Description
Variable Initial setting
range value
0～15 010
Variable Initial setting
range value
0～63
032
0～63
032