JVC AV-14F3PX Service Manual page 22

AV-14F3PX
MTS CIRCUIT (AUDIO CIRCUIT) ADJUSTMENT
The setting (adjustment) using the remote control unit is made on the basis of the initial setting values shown on pages 15.
Do not change the initial setting values of the setting (adjustment) items not listed herein.
Measuring
Item
instrument
Check of Remote
MTS INPUT control unit
LEVEL
Adjustment Signal
of generator
MTS
STEREO Frequency
VCO counter
Adjustment Signal
of generator
MTS SAP
VCO Frequency
counter
Check of Remote
MTS FILTER control unit
22
Test point Adjustment part
2. IN LEVEL
R OUT 3. FH MON.
[AUDIO OUT] 4. ST VCO
R OUT 9. 5FH MON.
[AUDIO OUT] 10. SAP VCO
6. FILTER
1. Select the sub menu screen SOUND from the SERVICE
MENU.
2. Select 2. IN LEVEL with the MENU 1/4 key, and confirm that
it is set at its initial setting value.
1. Receive a NTSC RF signal (non-modulated sound signal) from
the Antenna terminal.
2. Select the sub menu screen SOUND from the SERVICE
MENU.
3. Select 3. FH MON. with the MENU 1/4 key, and change its
setting value from 0 to 1 with the MENU 2/3 key.
4. Connect the frequency counter to the R OUT terminal of the
AUDIO OUT.
5. Select 4. ST VCO with the MENU 1/4 key, and confirm its
initial setting value.
6. Adjust 4. ST VCO so that the frequency counter reads
15.73kHz ± 0.1 kHz, with the MENU 2/3 key.
7. Again select 3. FH MON. with the MENU 1/4 key, and return
its setting value from 1 to 0 with the MENU 2/3 key.
1. Receive a NTSC RF signal (non-modulated sound signal) from
the Antenna terminal.
2. Connect a 1-MΩ resistor across pins 4 and 3 of the MPX con-
nector.
3. Select the sub menu screen SOUND from the SERVICE
MENU.
4. Select 9. 5FH MON. with the MENU 1/4 key, and change its
setting value from 0 to 1 with the MENU 2/3 key.
5. Connect the frequency counter to the R OUT terminal of the
AUDIO OUT.
6. Select 10. SAP VCO with the MENU 1/4 key, and confirm its
initial setting value.
7. Adjust 10. SAP VCO so that the frequency counter reads
78.67kHz ± 0.5 kHz, with the MENU 2/3 key.
8. Again select 9. 5FH MON. with the MENU 1/4 key, and re-
turn its setting value from 1 to 0 with the MENU 2/3 key.
1. Select the sub menu screen SOUND from the SERVICE
MENU.
2. Select 6. FILTER with the MENU 1/4 key, and confirm that it
is set at its initial setting value.
No. 56083
Description