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ADJUSTMENT OF MTS CIRCUIT
Measuring
Item
instrument
MTS INPUT
LEVEL
check
MTS STEREO
Signal
VCO
generator
adjustment
Frequency
counter
MTS SAP
Signal
VCO
generator
adjustment
Test point
Adjustment part
No.4 IN LEVEL
R OUT
No.5 FH MONITOR
[AUDIO OUT]
No.6 STEREO VCO
【 【 【 【 MPX】 】 】 】
No.11 5FH MON.
Connector
No.12 SAP VCO
【 【 【 【 4】 】 】 】 pin SDA
【 【 【 【 3】 】 】 】 pin GND
[AV
SELECTOR
PWB]
R OUT
[AUDIO OUT]
No. 51806
Description
1. Select the "No.4 IN LEVEL" of the SOUND MODE.
2. Verify that the "No.4 IN LEVEL" is set at its initial setting value.
1. Receive a RF signal (non-modulated sound signal) from the
antenna terminal.
2. Select the "No.5 FH MONITOR" of SOUND MODE, and
change the setting value from 0 to 1.
3. Connect the Frequency Counter to R OUT RCA pin of the
AUDIO OUT.
4. Select the "No.6 STEREO VCO".
5. Set the initial setting value of the "No.6 STEREO VCO" with the
LEFT/RIGHT key of the menu.
6. Adjust the "No.6 STEREO VCO" so that the Frequency
Counter will display 15.73kHz ± 0.1kHz.
7. Select the "No.5 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
antenna terminal.
2. Connect between pin 【 4 】 of 【 MPX 】 connector and GND (Pin
【 3 】 of 【 MPX 】 connector) through 1M Ω 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 R OUT RCA pin of the
AUDIO OUT.
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.
AV-27GFH
27
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