AV-14F13
AV-14F33
MTS CIRCUIT ADJUSTMENT[ AV-14F33/PH Only ]
Measuring
ItemTest pointAdjustment partDescription
instrument
INPUTNo.2 IN LEVEL1. Select the No.2 IN LEVEL of the SOUND mode in SERVICE
LEVEL
MENU.
check
2. Verify that the No.2 IN LEVEL is set at its initial setting value.
STEREO VCOSignalR OUTNo.3 FH MON1. Receive a NTSC RF signal (non modulated sound signal) from
adjustmentgenerator[AUDIO OUT]the antenna terminal.
No.4 ST VCO
2. Select the No.3 FH MON of SOUND mode in SERVICE
Frequency
counterMENU, change the setting value from 0 to 1.
3. Connect the frequency connector to R OUT RCA pin of the
AUDIO OUT
VariableInitial setting
No.Setting item4. Select the No.4 ST VCO.
rangevalue
5. Confirm the initial setting value of the No.4 ST VCO.
2IN LEVEL000^0630206. Adjust the No.4 ST VCO so that the frequency counter will
display 15.73kHz?0.1kHz.
3FH MON000 / 001000
7. Select the No.3 FH MON of the SOUND mode, and reset the
4ST VCO000^063025
setting value from 1 to 0.
SAPSignal MPXNo.9 5FH MON.1. Receive a NTSC RF signal (non modulated sound signal) from
VCOgeneratorConnectorthe antenna terminal.
adjustment 4 pin SDANo.10 SAP VCO.
2. Connect between pin 4 of MPX connector and GND (pin
Frequency3 pin GND
counter3 of MPX connector) through 1M? resistor.
[MAIN PWB]
3. Select the No.9 5FH MON. of the SOUND mode in SERVICE
R OUT
MENU, and reset the setting value from 0 to 1.
[AUDIO OUT]
4. Connect the frequency connector to R OUT RCA pin of the
VariableInitial settingAUDIO OUT.
No.Setting item
rangevalue5. Select the No.10 SAP VCO.
6. Confirm the initial setting value of No.10 SAP VCO.
95FH MON.000 / 001000
7. Adjust the No.10 SAP VCO so that the frequency connector
10SAP VCO.026000^063
will display 78.67kHz?0.5kHz.
6FILTER000^0630308. Select the No.9 5FH MON. of the SOUND mode, and reset the
setting value from 1 to 0.
7LOW SEP.000^063022
8HI SEP.000^063063
FILTERNo.6 FILTER1. Select the No.6 FILTER of the SOUND mode in SERVICE
checkMENU.
2. Verify that the No.6 FILTER is set at its initial setting value.
SEPARATIONTV audioL OUTNo.7 LOW SEP.1. Input a stereo L signal (300Hz) from the TV Audio multiplex
adjustmentmultiplexR OUTsignal generator to the antenna terminal. (NTSC)
signal[AUDIO OUT]No.8 HI SEP.
2. Connect an oscilloscope to L OUT RCA pin of the AUDIO
generator
OUT, and display one cycle portion of the 300Hz signal.
Oscilloscope3. Change the connection of the oscilloscope to R OUT RCA pin
of the AUDIO OUT, and enlarge the voltage axis.
4. Select the No.7 LOW SEP. of the SOUND mode in SERVICE
MENU.
5. Confirm the initial setting value of the No.7 LOW SEP.
L-ChannelR-Channel
6. Adjust the No.7 LOW SEP. so that the stroke element of the
signal waveformcrosstalk portion
300Hz signal will become minimum.
Minimum7. Change the signal to 3kHz, and similarly adjust the ?No.8 HI
SEP.
1 cycle
26No.52021 |