Nikko-Gamma5-tun-sm 维修电路原理图.pdf
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Nikko-Gamma5-tun-sm 维修电路原理图.pdf
ALIGNMENTTEST EQUIPMENTAllow a minimum of 10 minutes warm-up for test equip-ment and the tuner to be tested.Maintain rated line voltage.FM Signal Generator (FM SG)OscillascopeAC VoltmeterDistortion MeterMPX Signal Generator (MPX SG)Frequency CounterAM Sweep Generator (AM SG)DC VoltmeterFM SECTION5.12 MHz ADJ; 76 kHz ADJIMPX SIGNAL GENERATORIOUTPUTI1GENERAL ALIGNMENTAlways observe responsealignment procedure:INSTRUCTIONcurve on oscilloscope during1.Do not apply signal from FM or AM stations.Apply signal from generator only.2. Use of excessive signal from FM SG or AM SG cancause overloading of the tuner circuits. To properlyalign the tuner, adjust FM SG or AM SG outputlevel control so that response curve on oscilloscope isnot distorted.FM SIGNAL GENERATORSTANDARDDUMMYGAMMA VL-_IZEXT MOD INPUT_ -_ - - _TO FM ANTENNA TERMINALSTO OUTPUT TRERMINAl_SFigure 6. Test Equipment Hook-upFREQUENCY SYNTHESIS TUNER SECTIONFM Front End AdjustmentThis adjustment is factory preset and should not need readjustment.5.12 MHz Crystal Controlled Oscillator Adjustment.Set MAIN POWER switch (Sl I to ON position and POWER switch (S2) to OFF position.Connect frequency counter to test point “TP 1” (Photo 7).Adjust C917 (Photo 7) for 5.12 MHz * 20 Hz.1 DISTORTION 1AC VOLT-METERL-J_ _- _-INPUTIOSCILLOSCOPE1-TF5- TF4- TP5-R316- R315-TPl5-TP4$-c917Photo 7. Adjustment PointsRadioFans.CN 收音机爱 好者资料库RadioFans.CN 收音机爱 好者资料库
