Zenith-Radio-Corp-285-500E1 电路原理图.pdf

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1、VOLUME R-25, MOST-OFTEN-NEEDED 1965 RADIO SERVICING INFORMATION ZENITH RADIO CORP. CHASSIS 8KT40Z2 MODELS ROYAL 285-500E1 J4?q ttl-267 OUTPUT 2200 -eov fi I a . El-257 -if L * rj S w I IMF 6.6/1 5T=4=3P 6reRie$ T 4 woo t.-uis lotawisT sfcii?. ill ItrWS t -,.c UNLESS O All APiCirORS if IN HliMfUl re.

2、 vemsrs snm ut hfasur * Sienii jsn3 i vicuiN fust SITt* WNCI MAIN APPRO! I CONTROL - I21-26C TRANSISTOR & TRIMMER LAYOUT Operation t Input Signal Connect Inner Conductor T4, DRIVER TRANS. T2.2ND I.F. TRANS. T3.5R0 I.F TRANS. Frequency 455 KC Repeat Steps 3 & 4 From Oscillator To ONE TURN LOOSELY COU

3、PLED TO THE ANTENNA Set Diet At Trimmers Purpose 600 KC Adj. Tl, T2 For LF. T3 for Maxi- Alignment mum output 600 KC Adj. L2 for Tune Trap to IF Minimum out- Frequency put Gang Wideopen Set Oscillator To Dial Scale Near 600 Adjust slug Adjust T5 for Max- in T5 imum output white rocking gang. Tune T5

4、 for Maximum out put regardless of _ dial accuracy Align Loop Antenna j CHASSIS INFORMATION CHART Chassis Part No. R.F. Mixer Osc. 1st I.F. 2nd I.F. Crystal Diode Detector Driver Output- Output Supplier 8KT40Z2 j 9 121-256 PNP 2N1632 121-257 PNP 2N1526 121-258 PNP 2N1524 121-259 PNP 2N1524 121-260 PNP 2N1524 103-19 or 103-44 121-266 PNP 2N406 121-267 Pair PNP PNP 2N408 R.C.A. 184 收音机爱 好者资料库 RadioFans.CN