Aiwa NSX-R50 Service Manual page 26

<TUNER Adjustment>
1. VT Adjustment and Check (LW)
Requirements
* Measuring instrument: Digital multimeter
Test point: VT, GND
Adjustment point: L942
(1) Connect a digital multimeter to VT and GND.
(2) Set the unit function to LW, and adjust the receiving frequency at 144 kHz.
(3) Adjust L942 so that the digital multimeter indicates 1.3 ± 0.05 V.
(4) Adjust the receiving frequency of the unit to 290 kHz.
(5) Check that the digital multimeter indicates 8.0 V or below.
2. VT Check (MW)
Requirements: Same as Item 1
(1) Connect the digital multimeter to VT and GND.
(2) Set the unit function to MW, and adjust the receiving frequency to 1,602 kHz.
(3) Check that the digital multimeter indicates 8.0 V or below.
(4) Adjust the receiving frequency of the unit to 531 kHz.
(5) Check that the digital multimeter indicates 0.6 V or above.
3. VT Adjustment and Check (FM)
Requirements: Same as Item 1.
(1) Connect the digital multimeter to VT and GND.
(2) Set the unit function to FM, and adjust the receiving frequency at 108.0 MHz.
(3) Adjust L907 so that the digital multimeter indicates 7.0 ± 0.05 V.
(4) Adjust the receiving frequency of the unit to 87.5 MHz.
(5) Check that the digital multimeter indicates 0.5 V or above.
4. Clock Check
Requirements
* Measuring instrument: Frequency counter
Test point: CLOCK, GND
(1) Connect the frequency counter to CLOCK and GND.
(2) Set the unit function to MW, and adjust the receiving frequency to 1,602 kHz.
(3) Check that the frequency counter indicates 2,052 kHz ± 45 Hz.
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DIGITAL MULTIMETER
V
VT
GND
FREQUENCY COUNTER
Hz
CLOCK
GND