Measurements And Adjustments; Tuner Section - Panasonic SL-CT582VEE Service Manual

SL-CT582VEE

15 Measurements and Adjustments

15.1. Tuner section

Connect lead wire for test points FM IN and FM GND.
Refer to Fig. 15-1.
(Refer to "Printed Circuit Board Diagram 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 Fig. 15-2.
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 Fig. 15-3.
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 Fig. 15-2.
3. Set the unit to AM mode.
4. Set AM-SG to 594 kHz.
5. Receive 594 kHz in the unit.
6. Adjust L1202 for maximum output. Refer to Fig. 15-3.
Fig. 15-1.
Fig. 15-2.
30
Fig. 15-3.