RCA-Victor-Co-Inc-3-BX-671 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN MANUAL OF 1954 MOST-OFTEN-NEEDED RADIO DIAGRAMS Alignment Procedure RCA Victor Models 3-BX-671, 3-BX-672 r cos, gang dinl (Continued from adjacent page, at left) Alignment Procedure Close gang and set dial pointer to mark on dial plate. Turn volume and treble tone controls tq

2、 maximum clocftwise position. Turn bass tone control to maximum counterclockwise position. CONNECT HIGH I SIGNALl DIAL ADJUST FOR STEP SIDE OF MG. GEN. POINTER MAXIMUM GEN. TO OUTPUT SETTING OUTPUT Pin #8 of 1L6 Conv. thru 0.01 mid. Install bottom cover. Secure aluminum alignment fixture in place. C

3、onnect 24 mmfd. in series with 22 ohms between sig. generator lead and C39. 1 I 16M Band j SIGNAL DIAL ADJUST FOR GEN. POINTER MAXIMUM OUTPUT SETTING OUTPUT “A Band T3 top and bottom Quiet cores 455 kc point T2 top 1600 kc and bottom cores Right C40D-T hand top of gang stop 16M Band Left Til Oi hand

4、 stop_ 16M Band Rock gang. 17.8 me Lll R.F. -f Signal_L5 Ant._ 19M Band Left T10 Osc. hand stop_ 19M Band Rock gang, Peak 15.2 me L12 R.F. -f Signal_L6 Ant._ 25M Band Left T9 Osc. hand stop_ 25M Band Rock gang, Peak 11.8 me 11.8 me L13 R.F. + _Signal_L7 Ant._ 31M Band 9.45 me Left T8 Osc. hand _stop

5、_ 31M Band Rock gang, Peak 9.6 me 9.6 me L14 R.F. -+* _Signal_L8 Ant._ C Band 8.1 me Right *C40C-T top hand of gang. C16 R.F. _stop_C7 Ant._ C” Band 3.9 me Left T7 Osc. hand L9 R.F. _stop j_L4 Ant._ Repeat steps 13 and 14 until maximum gain is obtained. C39, term. 7 on SID thru dummy load indicated

6、4.05 mc “B Band Right C32 Osc. hand C18 R.F. stop C5 Ant. 1.97 mc “B Band Left T6 Osc. hand L10 R.F. stop L3 Ant. Repeat steps 16 and 17 until maximum gain is obtained. Remove alignment fixture and install chassis fn cabinet. Plug in loop cable. SRI SELENIUM AECT. (UNDER CHASSIS) ooolpoo .nDOO0OOO R

7、S3 OjOOOOOO _J50 0 00 0 0 Short length of “A Band 1620 kc Right C31 Osc. hand _stop _ “A” Band 1400 kc 1400 kc C20 R.F. Signal C4 Ant. “A” Band Rock gang. Peak 600 kc 600 kc T5 Osc. trans., -f _ Signal ) T1 R.F._ Repeat steps 19. 20 and 21 until maxi mum gain is obtained. Exchange loop antenna plug

8、with external Ferrite Rod antenna .plug. Extend cable to maximum. _ “A” Band | 1400 kc 1400 kc C43 Ferrite _Signal_Rod Ant. *The tuning range and dial calibration of the succeeding bands depend upon the accuracy of this adjustment. Avoid aligning on image. The local oscillator is 455 kc higher in fr

9、equency than the RF on all bands A R.F. 1400KC. C20 *9* R.F. 4.05 MC. , C19 31M R.F 9.9 MC. LI4 v 25M R.F. 11.9 MC L13 31M OSC. 9,4ft MC. T9 25M OSC ll.ftft MC. T9 19M OSC 14J MC. T10 19M R.F 15.2 MC. L12 *9* OSC. 405 MC. C32 A OSC. 1920 KC. C31 9* OSC. 1.97 MC. T9 MM OSC. 17.9 MC. Til MM R.F. 17.9

10、MC. Lll “A* OSC. 900 KC. T5 Tuner Adjustment LocationsOscillator and R.F. 25M ii.a mc. L7 A 1400 KC. C4 C4 ANT _ 1400 KC. B 4.05 MC. -J1 ANT SOCKET C5 (LOOK AND FERRITE ROD) _C400-T 10.2ft MC. *C 3.9 MC. L4 1.97 MC. U3 19M 15.2 MC. ue ISM 17.8 MC. US Tuner Adjustment LocationsAntenna ON-OFF ft VOL. CONTR. BA NO SWITCH (Oil 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN