User manual PIONEER SX-440 schematic

[. . . ] Through a 1k ohm resistor, connect an AM signal generator to the AM antenna terminal. Set for 40OHz at 100dB and 3O% modulation. 2 Connect AC voltmeter to TAPE REC iack (L or R). Set AM signal generator and SX-440 dial indication to point A (600kHz). [. . . ] Set AM signal generator and SX-440 dial indication to point A (600kHz). Adjust T6 for maximum indication on AC voltmeter. Set AM signal generator and SX-440 dial indication to point C (1, 400kH2). Adjust TC4 for maximum indication on AC voltmeter. Again set AM signal generator and SX-440 dial indication to point A. Adjust bar antenna core for maximum indication on AC voltmeter. Return AM signal generator and SX-440 dial indication to point C. Adjust TC5 for maximum indication on AC voltmeter. Repeat steps 4-11 to eliminate variations in AC voltmeter indications at noint A and C. F AC voltmeter A M s i g n a lg e n e r a t o r q' tr@ . { ) q 1 25 9. 2 FM SECTION 1. Through 300 ohm dummy antenna, connect FM signal generator to the 300 ohm FM antenna terminals and set for 4OOHzat 100dB and IO0% modulation. Connect oscilloscopehorizontal input to MPX signal pilot output and vertical input via probe to TP (No. Set SX-440 dial indication to 98MHz and adjust FM signal generator for center of scale indication on AM/FM meter. With FM signal generator unmodulated, adjust VR1 so that lissajous pattern on oscilloscope becomes stationary as shown in Fig. 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 F M s i g n a lg e n e r a t o r Dummy load tl' Oscilloscope M P X s i g n ag e n e r a t o r l 'a t I I l I r|} ' I I I I I I Fig. 12 I I i 9 . 4 P O W E RA M P L I F I E R S E C T I O N( I D L E C U R R E N T } 1. Set BASS and TREBLE controls ro center position. Nothing should be connected to the INPUT jacks of SX-440 and an 8 ohm dummy load should be connected across the SPEAKER terminal. A DC voltmeter should be connect across between terminal number 19 1+;, 20 (-) for Left channel and 18 1+1, l7 (-) for Right channel. Cut the jumper lead, if the voltage less than 15mV. a r'' DC Voltmeter fi j**' ita { fNt # ed sx-450 ) 1 0 . D r A L C O R DS T R T N G T N G Removethe Front panel (Seepage 14, 15). [. . . ] A DC voltmeter should be connect across between terminal number 19 1+;, 20 (-) for Left channel and 18 1+1, l7 (-) for Right channel. Cut the jumper lead, if the voltage less than 15mV. a r'' DC Voltmeter fi j**' ita { fNt # ed sx-450 ) 1 0 . D r A L C O R DS T R T N G T N G Removethe Front panel (Seepage 14, 15). Turn tuning drum fully clockwise (as viewed from X direction in Fig. [. . . ]