Aiwa NSX-R30, Service Manual

Page: 37 / 55

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<TUNER Adjustment>
1. LW VT Adjustment
Requirement:
• Measuring instrument: Digital multimeter
• Test point: TP1 (VT), GND
• Adjustment location: L942
1) Connect the digital multimeter between TP1 (VT) and GND.
2) Set the function of the unit to LW, and tune to the receiving frequency at 144kHz.
3) Adjust L942 so that the digital multimeter indicates 1.3±0.05V.
2. MW VT Check
Requirement:
• Measuring instrument: Digital multimeter
• Test point: TP1 (VT), GND
1) Connect the digital multimeter between TP1 (VT) and GND.
2) Set the function of the unit to MW, and tune to the receiving frequency at 1,602kHz.
3) Check that the digital multimeter indicates 8V or less.
4) Turn to the receiving frequency at 531kHz.
5) Check that the digital multimeter indicates 0.6V or above.
3. FM VT Adjustment and Check
Requirement:
• Measuring instrument: Digital multimeter
• Test point: TP1 (VT), GND
• Adjustment points: L907
1) Connect the digital multimeter between TP1 (VT) and GND.
2) Set the function of the unit to FM, and tune to the receiving frequency at 108.0MHz.
3) Adjust L907 so that the digital multimeter indicates 7.0±0.1V.
4) Tune the receiving frequency at 87.5MHz.
5) Check that the digital multimeter indicates 0.5V or above.
4. Clock Check
Requirement:
• Measuring instrument: Frequency counter
• Test point: TP2 (CLK), GND
1) Connect the frequency counter between TP2 (CLK) and GND.
2) Set the function of the unit to MW, and tune to the receiving frequency at 1,602kHz.
3) Check that the frequency counter indicates 2,160kHz±45Hz.
<MW/LW Adjustment>
Make the following preparation for MW/LW adjustment.
Preparation
• Standard Signal Generator (S.S.G.) / Loop antenna / Oscilloscope / AC millivoltmeter / Dummy resistance (6 ohms)
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.