Measurements And Adjustments - Panasonic SL-SV550GT Service Manual

15. Measurements and Adjustments

15.1. Tuner section
Connect lead wire for test points FM IN and FM GND. / Refer to
(Refer to "Printed Circuit Board and Wiring Connection Diagram" about FM IN and FM GND.)
15.1.1. Measurement condition
1. Set volume control to maximum.
2. Release the hold state.
3. Set power source voltage to 4.5V DC. (AC adaptor IN)
15.1.2. Control positions and equipment used
1. Signal generator (FM/AM)
2. Oscilloscope
3. Headphones jig
15.1.3. FM RF adjustment
1. Connect the FM signal generator to FM IN(+) and FM GND(-).
2. Connect the oscilloscope to headphones jack. / Refer to
3. Set the unit to FM mode.
4. Set FM-SG to 90 MHz.
5. Receive 90 MHz in the unit.
6. Adjust VR1101 for maximum output. Refer to
15.1.4. AM RF adjustment
1. Fashion a loop of several turns of wire and radiate a signal into
the loop antenna of receiver.
2. Connect the oscilloscope to headphones jack. / Refer to
3. Set the unit to AM mode.
Fig. 15-1.
Fig. 15-1.
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Fig. 15-2.
Fig. 15-3.
Fig. 15-2.