RCA-Victor-Co-Inc-RC-589 电路原理图.pdf

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1、MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS Bottom view of TUBE SOCKETS 1R.5 tST.DET. Mfr. No. 174 Alignment Procedure B BAtt. 67 Vz V. K= IOOO VOLTAGES SHOULD HOLD WITHIN 20% WITH RATED BATTERY VOLTAGE. it- MEASURED WITH CHANAlYST OR NAOLTOHMYST. ALL VOLTAGES ARE MEASURED WITH respect to Chassis g

2、round. - hinge F- TO REMOVE TUBE BHCLF a Battery BRACKET Teat Oscillator.Connect test oscillator as indicated in chart keeping the output as low as possible to avoid A V C action. Output Meter.Connect meter from top lug of TBI (plate of 354) to ground. Turn volume control to maximum position. Fig. I

3、 shows the modifications necessary to convert the center strip portion of a case into a convenient shield to be used as a substitute for the regular case center strip in the RF, Osc. align ment. Connect die Adjust die high side of 1 rune test-osc. Turn radio following for test osc. to dial to max. p

4、eak to output Connection 455 kc Quiet point Cll, C12 lug of C2, located on near 1,600 kc i 2nd I-F trans. rear of gang in series 455 kc Quiot point C8, C9 with .01 mf. near 1,600 kc 1st I-F trans. 1,600 kc 1.600 kc CS (o.c.) * Antenna coupling loop thru 200 1,500 kc 1.300 kc C2 (ant.) mmi. capacitor

5、 600 kc 600 kc L2 (osc.) CRITICAL LEAD DRESS 1. Dress blue, green and black leads of second I-F transformer as direct as possible. If excess lead exists, dress down side of socket and flat against chassis to transformer opening. 2. Cross the green and the black leads inside the first I-F trans forme

6、r can, keeping the green lead to the outside. Keep the blue and the green leads separated as far as possible through out their length. 3. Dress audio coupling capacitor (C14; .002 znf.) and the lead to the volume control up and underneath the shelf supporting the output transformer. 4. Dress the thr

7、ee capacitors pyramided behind die speaker, parallel to the complete assembly and with enough room be hind the battery holder to allow the holder to move when a battery is installed or removed. 5. Dress the B battery leads behind the gang frame and over the top of the output transformer. 6. Observe

8、the outside foil connections on all paper capacitors, also the polarity of the electrolytic capacitor (Cl7). 7. Keep blue and red leads of output transformer above die mounting shelf. 8 Repeat steps 4 and 5 for final adjustments. Clt-CR .Ji.-i. . . mi. . .I 455 KC. * Steps 3, 4 and 5 require a coupl

9、ing loop from the signal gen erator to feed a signal into the. receiver loop located in the lid. This loop should be approximately one turn of 6 x 3 Vi inches coupled to Ihe signal generator through a 200 mmi. capacitor, and loosely coupled to the receiver loop antenna at about 1% inches distance, so as not to disturb the receiver loop inductance. Ground test oscillator through .1 mf. capacitor to receiver chassis. Tools required: 1. One Phillips No. I screwdriver. 2. One small neutralizing alignment tool. COMPILED BY M. N. BEITMAN. SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN