JVC AV-32220/G Service Manual page 26

AV-32220
Measuring
Item
instrument
MTS SAP Signal
VCO generator
adjustment
Frequency
counter
MTS FILTER
check
MTS TV audio
SEPARATION multiplex
adjustment signal
generator
Oscilloscope
L-Channel
signal waveform
1 cycle
26
Test point Adjustment part
【 【 【 【 MPX】 】 】 】
No.11 5FH MON.
Connector
No.12 SAP VCO
【 【 【 【 4】 】 】 】 pin SDA
【 【 【 【 3】 】 】 】 pin GND
【 【 【 【 2】 】 】 】 pin RTV
[AV
SELECTOR
PWB]
No.8 FILTER
【 【 【 【 MPX】 】 】 】 No.9 LOW SEP.
Connector
No.10 HI SEP.
【 【 【 【 1】 】 】 】 pin LTV
【 【 【 【 2】 】 】 】 pin RTV
[AV
SELECTOR
PWB]
R-Channel
crosstalk portion
Minimum
No. 51782
Description
1. Receive a RF signal (non-modulated sound signal) from the
antenna terminal.
2. Connect between pin【4】of【MPX】connector and GND (Pin
【3】of【MPX】connector) through 1MΩ Resistor.
3. Select the "No.11 5FH MON." of the SOUND MODE, and reset
the1 setting value from 0 to 1.
4. Connect the Frequency counter to pin【2】(R.OUT) of【MPX】
connector.
5. Select the "No.12 SAP VCO".
6. Set the initial setting value of "No.12 SAP VCO" with the
LEFT/RIGHT key of the menu.
7. Adjust the "No.12 SAP VCO" so that the Frequency Counter
will display 78.67kHz±0.5kHz.
8. Select the "No.11 5FH MON." of the SOUND MODE, and reset
the setting value from 1 to 0.
1. Select the "No.8 FILTER" of the SOUND MODE.
2. Verify that the "No.8 FILTER" is set at its initial setting value.
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】 】 】 】 (L OUT) of 【 【 【 【 MPX】 】 】 】
connector, and display one cycle portion of the 300Hz signal.
3. Change the connection of the oscilloscope to pin【 【 【 【 2】 】 】 】 (R OUT)
of 【 【 【 【 MPX】 】 】 】 connector, and enlarge the voltage axis.
4. Select the "No.9 LOW SEP." of the SOUND MODE.
5. Set the initial setting value of the "No.9 LOW SEP." with the
LEFT/RIGHT key of the menu.
6. Adjust the "No.9 LOW SEP." so that the stroke element of the
300Hz signal will become minimum.
7. Change the signal to 3kHz, and similarly adjust the "No.10 HI
SEP.".