Nikko Gamma V Tuner 电路图.pdf

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1、ALIGNMENT TEST EQUIPMENT Allow 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) Oscillascope AC Voltmeter Distortion Meter MPX Signal Generator (MPX SG) Frequency Counter AM Sweep Generator (AM SG) DC Voltmeter

2、FM SECTION 5.12 MHz ADJ; 76 kHz ADJ IMPX SIGNAL GENERATORI OUTPUT I 1 GENERAL ALIGNMENT Always observe response alignment procedure: INSTRUCTION curve on oscilloscope during 1.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

3、 can cause overloading of the tuner circuits. To properly align the tuner, adjust FM SG or AM SG output level control so that response curve on oscilloscope is not distorted. FM SIGNAL GENERATOR STANDARD DUMMY GAMMA V L-_ IZEXT MOD INPUT _ - _ - - - _ TO FM ANTENNA TERMINALS TO OUTPUT TRERMINAl_S Fi

4、gure 6. Test Equipment Hook-up FREQUENCY SYNTHESIS TUNER SECTION FM Front End Adjustment This 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 fr

5、equency counter to test point “TP 1” (Photo 7). Adjust C917 (Photo 7) for 5.12 MHz * 20 Hz. 1 DISTORTION 1 AC VOLT- METER L-J _ _- - _- INPUT I OSCILLOSCOPE 1 -TF5 - TF4 - TP5 -R316 - R315 -TPl 5-TP4 $-c917 Photo 7. Adjustment Points RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库