Pioneer sx-450 manual

9 . 3 MPX SECTION

1.Through 300 ohm dummy antenna, connect FM signal generator to 300 ohm FM antenna terminals.

2.Connect multiplex signal generator to extemal modulation terminals of FM signal generator.

3.Connect oscilloscopehorizontal input to MPX signal pilot output and vertical input via probe to TP (No. 13) of circuit board.

sx-450

4.Set SX-450 dial indication to 98MHz and adjust FM signal generator for center of scale indi- cation on AM/FM meter.

5.With FM signal generator unmodulated, adjust VR1 so that lissajouspattern on oscilloscope becomesstationary as shown in Fig. 12.

6.With MPX signal generator modulation lkHz, L + R 67.5kHz deviation and pilot 7.5kHz deviation, adjust T4 for minimum distortion.

AC voltmeter Distortion meter

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