-39-
4. IF Adjustment
Conditions: The same conditions as specified in Preparation.
O
Adjustment point: L802
1) Set up the S.S.G. to AM, carrier 999 kHz, modulation degree 30% and source 1 kHz.
2) Tune the reception frequency to AM 999 kHz.
3) While observing the 1 kHz waveform with an oscilloscope, decrease the S.S.G. output level. (Decrease until small noise is visible on waveform.)
4) Adjust L802 until the milli-volt meter reading becomes maximum.
5. Tracking Adjustment
Conditions: The same conditions as specified in Preparation.
O
Adjustment point: L952/L953
1) Set up the S.S.G. to AM, carrier 603 kHz, modulation degree 30% and source 1 kHz.
2) Tune the reception frequency to AM 900 kHz.
3) While observing the 1 kHz waveform with an oscilloscope, decrease the S.S.G.. output level. (Decrease until small noise is visible on waveform.)
4) Adjust L952 until the milli-volt meter reading becomes maximum.
5) Set up the S.S.G. to AM, carrier 603 kHz, modulation degree 30% and source 1 kHz.
6) Set the unit to the receiving frequency at AM 603 kHz.
7) Adjust L953 until the milli-volt meter reading becomes maximum.
8) Repeat the above step 1 to 7 two to three times.
6. AM Auto Stop Check
Conditions: The same conditions as specified in Preparation.
1) Set up the S.S.G. to AM, carrier 999 kHz, modulation degree 30%, source 1 kHz and output 40 to 65 dBuv.
2) Let the NSX-RV15 start the Tuning Search. Check that the Tuning Search stops at AM 999 kHz automatically.
<FM Adjustment>
Before starting the FM adjustment, perform the preparation shown below.
Preparation
O
Measuring equipment: Standard signal generator (S.S.G.), oscilloscope, milli-volt meter and dummy resistor (6
Ω
)
1) Connect measuring equipment as shown below.
2) Connect the S.S.G. output to antenna input of the NSX-RV15.
Conditions: The same conditions as specified in Preparation.
1) Set up the S.S.G. to FM, carrier 87.5 MHz, modulation 75 kHz and source 1 kHz.
2) Tune the reception frequency to 87.5 MHz.
3) While observing the 1 kHz waveform with an oscilloscope, decrease the S.S.G. output level. (Decrease until small noise is visible on waveform.)
4) Adjust L904 until the milli-volt meter reading becomes maximum.
Conditions: The same conditions as specified in Preparation.
1) Set up the S.S.G. to FM, carrier 98 MHz, modulation 67.5 kHz, source 1 kHz and output 74 dBuv.
2) Switch the S.S.G. to PILOT ON and set the PILOT to 7.5 kHz.
3) Tune the reception frequency to FM 98 MHz.
4) Set the S.S.G. output to L-channel only. Check that the level difference between L-channel and R-channel is 22 dB or more.
5) Check the R-channel in the same way.
9. Auto Stop Check
Conditions: The same conditions as specified in Preparation.
1) Set up the S.S.G. to FM, carrier 98 MHz, modulation 75 kHz, source 1 kHz and output 35 dBuv or less.
2) Let the NSX-RV15 start the Tuning Search. Check that the Tuning Search stops at FM 98 MHz automatically.
ELECTRICAL ADJUSTMENT-3/6
DUMMY
SPOUT(L)
AC MILLIVOLTMETER
CH2
CH1
6
OUTPUT
OSCILLOSCOPE
CH2
CH1
LOAD
SET
Standerd Signal Genertaor
FM ANT
SPOUT(R)
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