Aiwa NSX-R20 Service Manual page 40

QQ
<AM Adjustment>
3 7 63 1515 0
Make the following preparations for AM adjustment.
Preparations
• Standard Signal Generator (S.S.G.) / Loop antenna / Oscilloscope / Millivoltmeter / Dummy resistance (6ý)
1) Connect the unit and measuring instruments as shown in the diagram below.
2) Position the loop antenna connected to S.S.G. and the one connected to the unit 60cm apart.
4. IF Adjustment
Requirements: As instructed in preparations.
• Adjustment point: L802
1) Set S.S.G. to AM; carrier of 1000kHz with 30% modulation, and source at 1kHz, position output at maximum.
2) Tune the receiving frequency of the unit at AM1000kHz.
3) While monitoring the waveform at 1kHz through the oscilloscope, lower the output level of S.S.G. maximum (till a certain degree of
noise is monitored).
4) Adjust L802 so that the millivoltmeter points maximum.
5. Tracking Adjustment
Requirements: As instructed in preparations.
TE
L 13942296513
• Adjustment point: L952 / L953
1) Set S.S.G. to AM; carrier of 1000kHz with 30% modulation, and source at 1kHz, position output at maximum.
2) Tune the receiving frequency of the unit at AM1000kHz.
3) While monitoring the waveform at 1kHz through the oscilloscope, lower the output level of S.S.G. maximum (till a certain degree of
noise is monitored).
4) Adjust L952 so that the millivoltmeter points maximum.
5) Set S.S.G. to AM; carrier of 600kHz with 30% modulation, and source at 1kHz.
6) Tune the receiving frequency of the unit at AM600kHz.
7) Adjust L953 so that the millivoltmeter points maximum.
8) Repeat above steps 1) to 7) 2 to 3 times.
6. Auto-Stop Check
Requirements: As instructed in preparations.
1) Set S.S.G. to AM; carrier of 1000kHz with 30% modulation, source at 1kHz, and output of 40 to 65dBuV.
2) Apply the tuning search function, and check that the unit automatically stops at AM1000kHz.
www
.
http://www.xiaoyu163.com
x ao u163
y
i
http://www.xiaoyu163.com
2 9
8
Q Q
3 6 7 1 3 1 5
co
.
– 40 –
9 4 2 8
0 5 8 2 9 9 4 2 8
m
9 9
9 9