AV-27D502
28
No. 51797
Item
Measuring
instrument
Test point
Adjustment part
Description
MTS SAP
VCO
adjustment
Signal
generator
Frequency
counter
No.9 5FH MON.
No.10 SAP VCO
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 1M
Ø
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.
MTS FILTER
check
1. Select the No.6 FILTER of the SOUND MODE.
2. Verify that the No.6 FILTER is set at its initial setting value.
No.6 FILTER
[MPX]
Connector
4 pin TP_952.5
3 pin GND
2 pin AUDIO_R
MTS
SEPARATION
adjustment
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.
No.7 LOW SEP.
No.8 HI SEP.
TV audio
multiplex
signal
generator
Oscilloscope
[MPX]
Connector
1 pin AUDIO_L
2 pin AUDIO_R
3 pin GND
L-Channel
signal waveform
R-Channel
crosstalk portion
Minimum
1 cycle
MTS INPUT
LEVEL
check
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.
No.2 IN LEVEL
MTS STEREO
VCO
adjustment
Signal
generator
Frequency
counter
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.
No.3 FH MONITOR
No.4 STEREO VCO
[MPX]
Connector
2 pin AUDIO R
3 pin GND
ADJUSTMENT OF MTS CIRCUIT
Содержание AV 27D502
Страница 62: ...AV 27D502 AV 27D502 No 51797 No 51797 TOP FRONT AV SELECTOR PWB PATTERN 2 20 2 19 ...
Страница 63: ...AV 27D502 AV 27D502 No 51797 No 51797 CRT SOCKET PIP TOP FRONT TOP CRT SOCKET AND PIP PWB PATTERNS 2 21 2 22 ...
Страница 84: ...AV 27D502 No 51797 43 ...
Страница 130: ...Troubleshooting 46 ...
Страница 135: ...Specifications 51 Specifications subject to change without notice ...