SX-450 AM / FM Stereo Receiver Service Manual

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Summary of content (12 pages)

PAGE 1
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RF Ass'/ AWE o o t, € o (ji L\V o, HA1.l37 a',eHAll STEREOIND 8V 50mA o E a o o s )< o 9 cci r &- l-. Y c - A ttr C3 I I" i .iT; Qns H'* 'T= iH )< o o ll o 2SCl222 xz -l-r33.511 I = 9, o. o <., c:, 9. t tAs J 2 I E I I ?scl38+ Dto Qrot l{l s tdt 'b 3 o3o,250313R flK NK <: N. @ E 2sv t-249J.
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RF Ass'7 AWE 2SC535 oro2 C,n4 VCrlCr r02 a l P1'-Jlc-'-#lFll;ia o l = J- l d 5 )< o 9 a, or-HAl.!3? lj a. h 0,032SC+61 T .Y{' LA vc,rct (v C63100/16' =l Rr+s24K E J AP s a la,Qnz2SA?25xz ozo3, - o Lr) f, ( l0v d 6 d r Ua (o 6 5 o o o O o (J d @ S IK a -o 2SCt222 S WI T C H E S ; SI SPEAKER S 1 P O W E RO F F 2 S P A 3 SP OFF 52 FM MUTING 0N -'t OFF 53 FUNCT|0N At1 Ft1 PHONO AUX I 2 3 + Sa tTOR TAPt MON oN -Q.
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sx-450 ? 9. ADJUSTMENT 9.1 AM SECTION 1. 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 FUNCTION switch to AM position. 4. Set AM signal generator and SX-450 dial indication to point A (600kHz). 5 . Adjust T6 for maximum indication on AC voltmeter. c). Set AM signal generator and SX-450 dial indication to point C (1,400kH2). 7.
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.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. 2. Connect AC voltmeter and distortion meter to TAPE REC jack (L or R). 3. Set FUNCTION switch to FM and MUTING switch to OFF. 4. Set FM signal generator and SX-450 dial indication to point A (90MHz). 5. Adjust T3 for maximum indication on AC voltmeter. 6. Adjust T5 lower core for center of scale indication on AM/FM meter. 7.
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sx-450 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. 4. Set SX-450 dial indication to 98MHz and adjust FM signal generator for center of scale indication on AM/FM meter. 5.
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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. 2. Nothing should be connected to the INPUT jacks of SX-450 and an 8 ohm dummy load should be connected across the SPEAKER terminal. 3. A DC voltmeter should be connect across between terminal number 19 1+;, 20 (-) for Left channel and 18 1+1, l7 (-) for Right channel. 4. Cut the jumper lead, if the voltage less than 15mV.
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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). 1. Turn tuning drum fully clockwise (as viewed from X direction in Fig. 13). 2. Tie one end of cord to stud on inner section of tuning drum (more easily performed by loosening setscrew and temporarily removing tuning drum from shaft). 3. Passcord through pulley opening, make a half tum around the pulley, then route in the sequence:pulley A-Dial needle-pulley B-C. 4.