Olympic-Radio-and-Television-Inc-AFM26 电路原理图.pdf

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1、II Olympic MODEL AFM 26 MODEL AFM 26 FM TUNER Vt I7EW Vl FM RF AMP Vl(B) !7EW/2 I V2 l7BAfe FM CONV | FM1FAMI I-OTP AM i aeoi Y JO* V3 l?BA6 FM IF AMP A M DE.T FM DET i-iL . t4-* , - -1 th-i 200 - J *70 0.01 Jr III l l 6BK 200 t-vV1-9 I 4 230 | | V5 I2AV6 J V6 50C5 Af AMP POWER i RESISTANCE VALUES I

2、N OHM CAPACITANCE VALUES LESS THAN 1.0 IN MFD VALUES ABOVE 1.0 M MHFO UNLESS OTHERWISE MMCATEP u f1 -vw I 0.01 -OTl a. ri r iTtmt w* 5H| T 0.001.T x T aoiX J 1 I -v x Connect high side Set signal Tufn pointer signal generator to generator to to Read output on Adjust the following (keep signal from s

3、ignal generator as low as possible) Before aligning close variable cendenser fully counter-clockwise (plates fully closed) and adjust pointer to coincide with the beginning of dial scale 1400 KC Extreme right hand position (condenser fully open) 1400 KC on dial Output meter across speaker voice-coil

4、 600 KC on dial R F. Section of vari- _ . AMA(Slug on top of chassis. Slug on 1 able condenser or pin Extreme right underside of chassis for maximum _7 of the 12BE6_ hand position reading)_ Tube in series with (condenser AMB(Slug on underside of chassis 2 a 0 1 MFD., 400 volt fully open) for maximum

5、 reading) -condenser-0utput meter - across speaker CT2 (Oscillator trimmer for maximum 1400 KC voice-coil output) - Use radiated signal 1400 KC , - (connect both sides on dia CTl (Antenna trimmer for maximum of signal generator output) - to radiation loop) “ ! ! .j,. _ . 600 KC Check that 600KC reso

6、nanec corres- 5 600 KC Qn d-aj ponds with 600KC point on dial . RF. section of the Connect osci- FMA(Slug on IF-1 of tuner. Slug on “TP” on FM Tuner . , loscope across 1F2 of tuner for maximum) -Extreme right , - 2 IT0PI SfSOO h 10.7 MC hand position (200MMFD) “ f chaSS1S fr condenser_ (condenser of

7、 FM DjrT maxlmum)_ fully open) maximum view FMC(Slug; on top of chassis. Slug on 3 of S curve underside of chassis for maximum reading)_ irt0 w_ OSC-C(oscillator trimer for maximum 4 108 MC 108 MC output) . Connect high side “ Output meter RF.C (FM.RF. Amp trimmer for maxi- 5 signal generator to 98

8、MC 98 MC across speaker mum output) _ Antenna screw._ voice-coil - its* Check that 90MC resonance corros- 6 90 MC 90 MC ponds with 90MC point on diaL NOTE : This Chassis is connected to one side of the power line. On AC operation an isolation transformer should be used to prevent shock hazard. To pr

9、otect the signal generator, if no isolation transformer available oy if the radio is operated on DC, connect a 0.1 pF capacitor between the high side of the signal generator and the radio. The output of the signal generator be no higher than necessary to obtain a usable output reading. Connect signa

10、l generator ground to chassis. R F. Section of vari able condenser or pin 7 of the 12BE6 Tube in series with a 0.1 MFD., 400 volt condenser Use radiated signal (connect both sides of signal generator to radiation loop) R F. section of the “TP” on FM Tuner “TP” in series with a 0.1 MFD 1400 volt cond

11、enser Connect high side signal generator to Antenna screw. Extreme right 10.7 MC hand position (condenser fully 5pen) 108 MC 108 MC 98 MC 98 MC 90 MC 90 MC : Connect osci- loscope across condenser (200MMFD) of FM DET maximum view of S curve Output meter across speaker voice-coil 83 收音机爱 好者资料库 RadioFans.CN