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5. AM Tracking Adjustment
Requirement: As instructed in preparation.
•
Adjustment locations: L952 / L953
1) Set S.S.G. to AM, carrier of 1,000kHz with 30% modulation, source at 1kHz, and output approximately at MAX.
2) Tune the unit to the receiving frequency at AM 1,000kHz.
3) While monitoring the waveform at 1kHz through the oscilloscope, lower the output level of S.S.G. (till a certain degree of
noise is monitored).
4) Adjust L952 so that the Millivoltmeter indicates maximum.
5) Set S.S.G. to AM, carrier of 600kHz with 30% modulation, and source at 1kHz.
6) Tune the unit to the receiving frequency at AM 600kHz.
7) Adjust L953 so that the Millivoltmeter indicates maximum.
8) Repeat the above steps 1 to 7 two or three times.
6. AM Auto-Stop Check
Requirement: As instructed in preparation.
1) Set S.S.G. to AM, carrier of 1,000kHz with 30% modulation, source at 1kHz, and output at 74dBµV.
2) Apply the tuning search function, and check that the unit automatically stops at AM 1,000kHz.
<FM Adjustment>
Make the following preparation for FM adjustment.
Preparation
•
Measuring instruments: Standard Signal Generator (S.S.G.) / Oscilloscope / Millivoltmeter / Dummy resistance (6W)
1) Connect the unit and measuring instruments as shown in the diagram below.
2) Connect the output of S.S.G. to the antenna input of the unit.
7. FM Tracking Adjustment
Requirement: As instructed in preparation.
•
Adjustment location: L904
2) Tune the unit to the receiving frequency at FM 87.5MHz.
4) Adjust L904 so that the Millivoltmeter indicates maximum.
Requirement: As instructed in preparation.
1) Set S.S.G. to FM, carrier of 98MHz with 67.5kHz modulation, source at 1kHz and output at 60dBµV.
2) Switch S.S.G. to PILOT ON and set to PILOT 7.5kHz.
3) Tune the unit to the receiving frequency at FM 98MHz.
4) Set the output of S.S.G. available only from Lch, and check that the difference between Lch and Rch is 25dB or above while monitoring
the Millivoltmeter.
5) Apply the above check to Rch.
9. FM Auto-Stop Check
Requirement: As instructed in preparation.
1) Set S.S.G. to FM, carrier of 98MHz with 75kHz modulation, source at 1kHz and output at 10 ~ 35dBµV or less.
2) Apply the tuning search function, and check that the unit automatically stops at FM 98MHz.
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