Aiwa NSX-TR99 Service Manual page 45

ELECTRICAL ADJUSTMENT -2/8
<TUNER Adjustment>
1. VT Adjustment (LW)
Requirements
• Measuring instrument: Digital multimeter
Test points: VT, GND
•
Adjustment point: L942
1) Connect the digital multimeter between VT and GND.
2) Set the function to LW, and tune the receiving frequency of the unit at 144 kHz.
3) Adjust L942 so that the digital multimeter ranges at 1.3
2. VT Check (MW)
Requirements: Same as above. Requirements
1) Connect the digital multimeter between VT and GND.
2) Set the function to MW, and tune the receiving frequency of the unit at 1,602 kHz.
3) Check that the digital multimeter ranges under 8.0 V.
4) Tune the receiving frequency of the unit at 531 kHz.
5) Check that the digital multimeter ranges above 0.5 V.
3. VT Adjustment and Check (FM)
Requirements: Same as the above.
• Adjustment point: L907
1) Connect the digital multimeter between VT and GND.
2) Set the function to FM, and tune the receiving frequency of the unit at 108.0 MHz.
3) Adjust L907 so that the digital multimeter ranges at 7.0
4) Tune the receiving frequency of the unit at 87.5 MHz.
5) Check that the digital multimeter ranges under 0.5 V.
4. CLOCK Check
Requirements
• Measuring instrument: Frequency counter
Test point: CLOCK (IC801 24PIN), GND
1) Connect the frequency counter between CLOCK and GND.
2) Set the function to MW, and tune the receiving frequency of the unit at 1,602 kHz.
3) Check that the frequency counter ranges at 2,160 kHz
0.05 V.
0.3 V.
45 Hz.
-45-
DIGITAL MULTIMETER
V
VT
GND
FREQUENCY COUNTER
Hz
CLOCK
GND