Lafayette-LR9090-rec-sm 维修电路原理图.pdf

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1、R fO mt -ffrodulor hiti (ompone ntr- lafayette IB-9090Pages 33-42 Courtesy of LAFAYETTE MDIO ELECTRONIcsI 9kHzDisconnect coupling Lytic CzS. Adjust RV4 for l9kHz +20H2 at TP4.AM ATIGNMENT-SELECTOR IN AM POSITIONConnect generator across loop f,ashioned of several turns of wire. Set volune at naxinun.

2、GENERATORFREQUENCYRADIO DIALSETTINGINDICATORADJUSTREMARKS45Sktz40 0 -hert zModu I at ionTuning gangful 1y openOutput meteracross voice coilCF4Adjust for maxirnum. Repeat untilno further irnprovement is noted.60 0kHz6 00kt IzilT4Adjust for maximum.1640kz1640kllzilcr7, cr6 , T3Adjust for maximum.140Ok

3、Hz1400k1zcr5Ad just f or maximum. Repeat Alt al ignmentuntil no further improvement is noted.FM IF ALIGNMENT USING FM SIGNAL GENERATOR-SELECTOR IN FM POSITIONHigh side of generator thru .001uF to Base FTR3.Use 60-hertz, frequency-modulated signal, 450ktlz sweep.Use 60-hertz sawtooth voltage in scope

4、 for horizontal deflection.GENERATORFREQUENCYRADIO DIALSETTINGINDICATORADJUSTREMARKST0 7MHz450kHz SweepPo int of non-int erferenc eVert input ofscope to T1, L3JunctionT2 , FTs (1)Disconnect stabilizing capacitorAdjust for maximurn gain and symmetryof response similar to Fig. 1.Re connectIVert input

5、ofscope to posi-tive end CzSr1 (1)Adjust Tl for maximum amplitudeand straightness of line, similar toFig . 2.FM RF ATIGNMENT.-SELECTOR IN FM POSITIONConnect generator across antenna terrninalsAdjustment of coils by bending should notwith lz-ohmbe attemptedcarbon resistorunless the coil1nl-sseries wi

6、th each 1ead.deformed or replaced.GENERATORFREQUENCYRADIO DIALSETTINGINDICATORADJUSTREMARKS108MFIzModulated108MHzDC probe of VTVMto positive endc25FT4 , FT3,FTz, FTl.Adjust for maximum.88MHzModul.ated8 8lt4Hzcr4, cTscrz,cr1Ad just for maximum. Repeat FIvl RF stepsunt i 1 no further improv ement i s

7、not ed .33RadioFans.CN 收音机爱 好者资料库FM STEREO ADJUSTMENTTune receiver for a stereo signal. Adjust balance control for equal channel output. Adjust Separationcontrol RV3 for best separation.Signa1 StrengthFor Al1For FMTune strong AIvt station, adjust RV 2 for Maximum deflectionon Signal Meter Ml.Tune st

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