Sears-Roebuck-and-Co-141418 电路原理图.pdf

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1、MANUAL OF 1942 MOST POPULAR SERVICE DIAGRAMS Sears, Roebuck and Co. ftodel 7057. Factory No. 141.418 Output meter connection . Across loudspeaker voice coll Output meter reading to indioate 500 milliwatts. ; Generator ground lead connection. . Dummy antenna value to be in series with generator outpu

2、t.See chart below Connection of generator output lead.See below Generator modulation. Position of Volume Control.clockwise Position of Dial Pointer with variable fully closed . On first mark 540 ko calibration mark. POSITION OF VARIABLE Open Fully open 1400 ko GENERATOR r 455 ko 1720 ko 1400 ko nnm/

3、r ANTENNA GENERATOR CONNECTION .1 mfd. 7H7 Grid .00005 mfd. Ant. Lead .00005 mfd. Ant. Lead TRIMMERS ADJUSTED (IN ORDER SHOWN) T2,T1 C2B* C2A* trimmer FUNCTION IF Osoillator Antenna ANT.COUPLED APPROXIMATE MICROVOLTS IMPORTANT ALIGNMENT NOTES * C2 A and B we best adjusted when the receiver is in the

4、 cabinet, through holes pro vided in the baok oover. * 120 microvolts per meter using standard Hazeltlne alignment loop 24 inches from re ceiver loop. For operation of the chassis outside the cabinet with the phonograph plug disconnected, connect a jumper wire across the two top terminals of the pho

5、no socket ,and between the two terminals marked X on the Recorder socket shown below. The alignment procedure should be repeated stage by stage, In the original order, for greatest accuracy. Always keep the output from the test osoillator at its lowest possible value to make the AVC action of the receiver ineffective. 7L17 ASKTfcT , 65Q76T mm aoaun uu rtesa not rmm *uu bimii. muo* v-mras mom at soaca Mans -ua so_ asussis -.ns uuat u /tuKjjnn ism mrm VOLT TOUSOMU SOU EO AAABDB 18 OIVXS. TSB vouam is zim too tm to au COMPILED BY M. N. BETTMAN. SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN