RCA-Victor-Co-Inc-6-B-4B 电路原理图.pdf

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1、VOLUME R-16, MOST-OFTEN-NEEDED 1956 RADIO SERVICING INFORMATION rc A /i cto R Models 6-B-4A, 6-B-4B, 6-b-s xv-/ y Chassis No. RC-1098B V3 2ND. DET. A.F-A.V.C. K1000 ALL RESISTANCE VALUES IN OHMS. ALL CAPACITANCE VALUES LESS THAN 1.0 IN UF. AND t.O AND A80VE IN UUF. EXCEPT those indicated. Alignment

2、Procedure R6 2 MEG VOLUMES CONTROLS VOLTAGES MEASURED TO CHASSIS WITH “VOLTOHMYST, SHOULD HOLD WITHIN 20% . ON VOLUME CONTROL Oulput Meter.Connect meter from No. 2 terminal o! V4 (plate of 3V4) to ground. Turn volume control to maximum position. Test-Oscillator.For all alignment operations, connect

3、the low side oi the test-oscillator to the receiver chassis, and keep the oscillator output as low as possible to avoid a-v-c action. Note:The Ferrite rod antenna coil is pre-adjusted and cemented to rod. Further adjustment is unnecessary. How ever, when replacing ant. assembly make certain that the

4、 coil end of the rod extends two inches beyond the tube shell. Adjust the Tun. tut- Turn radio W0,? Steps side of test osc. Connection lug of CI-2 located on rear of gang in series with .01 mf. Quiet point near 1800 kc * Antenna coupling loop (Chassis in case) Gang fully open 600 kc signed Rock gang

5、 Repeat steps 3, 4 and 5 C1-2T (ant.) A + i CONNECTOR 1U5 1U4 3V4 455 KC TOR CORE & BOTTOM CORE WTENNA COIL for max. peak output Top and bottom cores 2nd I-F trans.f Top and bottom cores 1st I-F trans.T A- / SPRING CONTACT TO CHASSIS SPEAKER- OUTPUT - TRANS. *4 TERMINAL ON SOCKET OF 3V4 -OSCILLATOR

6、COIL ADJUSTMENT T4 600 KC -TUNING CAPACITOR TOP-ANT. SECTION CI-2 1400 KC BOTTOM-OSC. SECTION CI I 1620 KC VOLUME CONTROL R6 Steps 3, 4 and 5 require a coupling lobp from the signal generator to feed a signal into the receiver ant. coil. This loop Mould be loosely coupled to the receiver antenna coi

7、l so as not to disturb the receiver ant. coil inductance. TBoth cores are adjustable from top of transformer. Use double- ended hexagon alignment tool. aare , k.J B+ B- I. To Remove Back Cover a. lnserl edge of coin Into slot In back cover (midway between handle supporls) and twist until the back co

8、ver disengages from Ihe main case. b. Pull Ihe back cover back and up, thereby unhooking the re taining lugs In the bottom of the matn case. II. To Replace Batteries a. Remove back cover. b. Remove either or both A and B baiteries as may be necessary. The B battery snap fasleners can besl be re* -moved by inserling a screwdriver under the snap fastener slrlp and prying upward. 115 收音机爱 好者资料库 RadioFans.CN