RCA-Victor-Co-Inc-6XF9 电路原理图.pdf

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1、MANUAL OF 19SS MOST-OFTEN-NEEDED RADIO DIAGRAMS AM-FM Radio Receiver rcaVictor Momi 6-xf-9 ALIGNMENT INDICATORS: An RCA VoltOhmyst or. equivalent meter is necessary for measuring developed d-c voltage during FM alignment. Con nections are specified in the alignment tabulation. An output meter is als

2、o necessary to indicate maximum audio output during AM alignment. Connect the output meter across the speaker voice coil. The RCA VoltOhmyst can also be used cm an AM alignment indicator, either to measure audio output or to measure AVC voltage. When audio output is being meas ured, the volume contr

3、ol should be turned to maximum. Adjust tone control to mid-position. SIGNAL GENERATOR: For all alignment operations, connect the low side of the signal generator to the receiver chassis. If output measure ment is used for AM alignment, the output of the signal gen erator should be kept as low cm pos

4、sible to avoid AVC action. AM Alignment FUNCTION SWITCH IN AM POSITION Connect high g.g gen Turn radio Adjust for Steps side of sig. output dial to peak output gen. to Pin No. 1 T4 bottom . of V3 core (sec.) 1 in series T4 top with .01 mfd A*c Quiet point core (pri.) Tap lug 4 Ion AM RF coil Short w

5、ire placed near loop for radiated signal Sig. gen. output Turn radio dial to Adjust for peak output 455 kc. (mod.) Quiet point at high freq. end T4 bottom core (sec.) T4 top core (pri.) T2 bottom core (sec.) T2 top core (pri.) 1620 kc. (mod.) 1620 kc. (gang open) C1E-T (osc.) 1400 kc. (mod.) 1400 kc

6、. C37 (ant.) C1C-T (rf.) 600 kc. (mod.) 600 kc. L6 (osc.) with (rocking gang) L4 (RF) Repeat steps 4, 5 and 6 until Maximum gain is obtained FM Alignment FUNCTION SWITCH IN FM POSITIONVOLUME CONTROL MINIMUMTONE CONTROL CENTER Connect high Steps side of sig. gen. to Pin No. 1 of V5-12AU6 Sig. gen. ou

7、tput Pin No. 1 of V4-12AU6 Pin No. 1 of V3-12BA6 Turn radio dial to Quiet point at low frequency end Adjust for max. output T6 top core for zero d.c. (across C26) T6 bottom core for maximum d.c. (junction of R24 and R25) fT5 top core T3 top core f*T3 bottom core T1 top core f*Tl bottom core FM Ant.

8、terminals thru 270 ohm resistor 87 me. 87 me. fFM osc. (gang closed) L8 106 me. 106 me. fFM R.F C1B-T 90 me. 90 me. tFM R.F. L2 Repeat steps 6 and 7 until maximum gain is obtained 9 100 me. 100 me. U* *If necessary for accurate peaking, the winding in the same trans former not being peaked should be

9、 loaded with a 680 ohm resistor. Connect VoltOhmyst to pin 1 of V5 through a 220K isolating re sistor with l/ inch maximum exposed lead at grid terminal end. Output adjusted for 1 volt d.c. Dress VoltOhmyst lead away from input circuits. Oscillator frequency is above signal frequency on both AM and

10、FM Chassis No. RC-1121B (See next page at right for circuit diagram and additional material.) If an FM sweep generator is used for FM alignment, adjust for 10.7 me, 0.4 me sweep. Connect oscilloscope across C26, adjusting discriminator T6 top core for 10.7 me crossover, and T6 bottom core for balanc

11、ed peaks. Peak separation should be approximately 330 kc. When aligning the other FM tuned cir cuits, connect oscilloscope lead through a 220K resistor to pin 1 of V5. Follow alignment table sequence, adjusting for maximum gain and symmetrical curves. TUNING RANGE Standard Broadcast (AM).540-1600 kc

12、 Frequency Modulation (FM).88-108 me Intermediate Frequency (AM).455 kc Intermediate Frequency (FM).10.7 me _14.1-_i-fc.-jj-, O O 000 OOOOOOOO jOjO ooN O O O OO OOOOOOOO oo o o o ooooooooooooooooo O O O Cf o o o o ) o o o o *? o O O O ooooooooo OOOOOOOO ooooooooo Rear View CRITICAL LEAD DRESS 1. All

13、 FM IF Transformer grid and plate leads should be short and direct cm possible and kept low, near chassis. 2. C26 leads should be kept as short as possible. 3. C32 leads should be kept as short as possible. 4. R24 and R25 leads should be kept as short as possible on T6 terminal 6 side. 5. C27 should

14、 ground in hole near terminal 5 of V6 wilh short leads. 6. AM oscillator coil should not be tilted over toward func tion switch when wrapping short bus leads to switch. 7. Keep leads V5 pin 5, to T6 term 1, as short as possible and low near chassis. 8. Dress C28 down on chassis and against terminal

15、board. Run filament lead between V5 and V6 on side of V6 socket opposite C28. 9. All ceramic button 4700 uuf condensers should have leads as short as possible. 10. Green lead from AM oscillator stator gang terminal to AM oscillator coil should be dressed against front of shield box and up above fila

16、ment choke. 11. RF plate choke LI, should be dressed at least Vs away from AM R.F. coil L4 and at least Vs from shield. 12. Mixer grid condenser C7 should be dressed away from FM oscillator gang stator terminal and away from leads connecting to terminals 8 and 9 of V2 socket. 13. Filament chokes L10

17、 and Lll should be raised a minimum of 1/16 above chassis. 14. Use varnished tubing only on choke and coupling cond. leads coming through shield partition slot. 15. Condenser C2 should have lead on antenna terminal end not more than 3/16 long to prevent possible contact of lead or body to Hot chassi

18、s. 16. Condensers C3 and C35 should use varnished tubing, not vinyl, to prevent breakthrough crossing chassis edge. 17. Oscillator grid condenser C17 should have short leads and be dressed away from filament choke L10. 18. Leads from loop terminal to chassis terminal board should have a minimum of three twists (otherwise loop increases oscillator radiation). 86 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN