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AV-N29702
ADJUSTMENT OF MTS CIRCUIT
Measuring
Item
instrument
MTS INPUT
Remote
LEVEL
control unit
check
Signal
MTS STEREO
VCO
generator
adjustment
Frequency
counter
Remote
control unit
Signal
MTS SAP
VCO
generator
adjustment
Frequency
counter
Remote
control unit
Resister
[1MØ]
MTS FILTER
Remote
check
control unit
MTS
TV audio
SEPARATION
multiplex
adjustment
signal
generator
Oscilloscope
Remote
control unit
L-Channel
signal waveform
1 cycle
26
Test point
Adjustment part
No.2 IN LEVEL
2 pin AUDIO R
No.3 FH MONITOR
3 pin GND
No.4 STEREO VCO
[MPX Connector
in MAIN PWB]
4 pin TP_952.5
No.9 5FH MON.
3 pin GND
No.10 SAP VCO
2 pin AUDIO_R
[MPX Connector
in MAIN PWB]
No.6 FILTER
No.7 LOW SEP.
1 pin AUDIO_L
2 pin AUDIO_R
No.8 HI SEP.
3 pin GND
[MPX Connector
in MAIN PWB]
R-Channel
crosstalk portion
Minimum
No. 51885
Description
1. Select the No.2 IN LEVEL of the SOUND MODE.
2. Verify that the No.2 IN LEVEL is set at its initial setting value.
Note: Menu "MTS" is set to "STEREO"
1. Receive a RF signal (nonmodulated sound signal) from the antenna
terminal.
2. Select the No.3 FH MONITOR of SOUND MODE, and change the
setting value from 0 to 1.
3. Connect the Frequency Counter to pin 2 of [MPX] connector and
GND (Pin 3 of [MPX] connector).
4. Select the No.4 STEREO VCO.
5. Set the initial setting value of the No.4 STEREO VCO with the LEFT/
RIGHT key of the remote control unit.
6. Adjust the No.4 STEREO VCO so that the frequency counter will
display 15.73kHz±0.1kHz.
7. Select the No.3 FH MONITOR of the SOUND MODE, and reset the
setting value from 1 to 0.
1. Receive a RF signal (non modulated sound signal) from the an-
tenna terminal.
2. Connect between pin 4 of [MPX] connector and GND (Pin 3 of [MPX]
connector) through 1MØ Resistor.
3. Select the No.9 5FH MON. of the SOUND MODE, and reset the
setting value from 0 to 1.
4. Connect the Frequency Counter to pin 2 of [MPX] connector and
GND (Pin 3 of [MPX] connector) .
5. Select the No.10 SAP VCO.
6. Set the initial setting value of the No.10 SAP VCO with the LEFT/
RIGHT key of the remote control unit.
7. Adjust the No.10 SAP VCO so that the frequency counter will dis-
play 78.67kHz±0.5kHz.
8. Select the No.9 5FH MON. of the SOUND MODE, and reset the
setting value from 1 to 0.
1. Select the No.6 FILTER of the SOUND MODE.
2. Verify that the No.6 FILTER is set at its initial setting value.
Note: Menu "MTS" is set to "STEREO"
1. Input a stereo L signal (300Hz) from the TV audio multiplex signal
generator to the antenna terminal.
2. Connect an oscilloscope to pin 1 of [MPX] connector, and display
one cycle portion of the 300Hz signal.
3. Change the connection of the oscilloscope to pin 2 of [MPX] con-
nector, and enlarge the voltage axis.
4. Select the No.7 LOW SEP. of the SOUND MODE.
5. Set the initial setting value of the No.7 LOW SEP. with the LEFT/
RIGHT key of the remote control unit.
6. Adjust the No.7 LOW SEP. so that the 300Hz signal level will be-
come minimum.
7. Change the signal to 3kHz, and connect an oscilloscope to pin 1 of
[MPX] connector.
8. Adjust the No.8 HI SEP. so that the 3kHz signal level will become
minimum.
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