Lafayette-LR9090-rec-sm维修电路原理图.pdf

R fO mt -ffrodulor hiti (ompone ntr- lafayette IB-9090 Pages 33-42 Courtesy of LAFAYETTE MDIO ELECTRONIcs I 9kHz Disconnect coupling Lytic CzS. Adjust RV4 for l9kHz +20H2 at TP4. AM ATIGNMENT-SELECTOR IN AM POSITION Connect generator across loop f,ashioned of several turns of wire. Set volune at naxinun. GENERATOR FREQUENCY RADIO DIAL SETTING INDICATORADJUST REMARKS 45Sktz 40 0 -hert z Modu I at ion Tuning gang ful 1y open Output meter across voice coilCF4 Adjust for maxirnum. Repeat until no further irnprovement is noted. 60 0kHz6 00kt Iz il T4Adjust for maximum. 1640kz1640kllz il cr7, cr6 , T3Adjust for maximum. 140OkHz1400k1zcr5Ad just f or maximum. Repeat Alt al ignment until no further improvement is noted. FM IF ALIGNMENT USING FM SIGNAL GENERATOR-SELECTOR IN FM POSITION High side of generator thru .001uF to Base FTR3. Use 60-hertz, frequency-modulated signal, 450ktlz sweep. Use 60-hertz sawtooth voltage in scope for horizontal deflection. GENERATOR FREQUENCY RADIO DIAL SETTING INDICATORADJUSTREMARKS T0 7MHz 450kHz Sweep Po int of non- int erferenc e Vert input of scope to T1, L3 Junction T2 , FTs (1)Disconnect stabilizing capacitor Adjust for maximurn gain and symmetry of response similar to Fig. 1. Re connect I Vert input of scope to posi- tive end CzS r1 (1)Adjust Tl for maximum amplitude and straightness of line, similar to Fig . 2. FM RF ATIGNMENT.-SELECTOR IN FM POSITION Connect generator across antenna terrninals Adjustment of coils by bending should not with lz-ohm be attempted carbon resistor unless the coil 1n l-s series with each 1ead. deformed or replaced. GENERATOR FREQUENCY RADIO DIAL SETTING INDICATORADJUSTREMARKS 108MFIz Modulated 108MHzDC probe of VTVM to positive end c25 FT4 , FT3, FTz, FTl .Adjust for maximum. 88MHz Modul.ated 8 8lt4Hzcr4, cTs crz,cr1 Ad just for maximum. Repeat FIvl RF steps unt i 1 no further improv ement i s not ed . 33 RadioFans.CN 收音机爱 好者资料库 FM STEREO ADJUSTMENT Tune receiver for a stereo signal. Adjust balance control for equal channel output. Adjust Separation control RV3 for best separation. Signa1 Strength For Al1 For FM Tune strong AIvt station, adjust RV 2 for Maximum deflection on Signal Meter Ml. Tune strong signal , adjust tuning for 0 on Tuning lreter Mz and adjust RVI for Maximum deflection on Meter MI. PSPA027CoX CAUTION FM CCTTNUED PROTECTIffi ACANST Ffrg, HAZARP REpLAcE cnti wtru sAtv fieErl6 As MARb, rt) !t (, (J tJ t iT T *8*6o/:l t , lf: I tl gi L ,A ,A., *r - - , -=li . *le+ tt *jir.gg I 1i,1 f q=tffid, 6. 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