RCA-Victor-Co-Inc-8B42 电路原理图.pdf

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1、MANUAL OF 19S0 MOST-OFTEN-NEEDED RADIO DIAGRAMS RCaVictor Battery Personal Receiver Models 8B41, 8B42, 8B43 Chassis No. RC-1069, RC-1069A, RC-1069B 32 | RADIUS T lg 16 2 HOLES Alignment Procedure Output Meter.Connect meter trom top lug oi TB5 (plate oi 3S4) to ground. Turn volume control to maximum

2、position. Test-Oscillator.For all alignment operations, connect 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. Alignment Shield.It is necessary to use a shield during oscil lator alignment. Fig. 3 shows the modiii

3、cations necessary to convert the center strip portion ol a case into a convenient shield to be used as a substitute ior the regular case center strip during oscillator align ment. I| a substitute case is not available, a shield may be improvised using a sheet oi aluminum (DO NOT USE STEEL) to approx

4、imate the shielding effect oi the case on the IRS tube, tuning condenser and oscillator coil. Connect the high Steps side ol test osc. Tune test- Turn radio osc. to dial to Adjust the following lor max. peak output f L_ 2-* ALIGNMENT p 23 _n euici n t H DIMENSIONS IN INCHES Fig. 3Alignment Shield Co

5、nnection lug ol Cl located on rear ol gang in series with .01 mf. Quiet point near 1,600 kc C12, C13 2nd I-F trans. 0bcl%t- O-T /T8 5 r-TO 3S4 PLATE /TO A VC XtO SI Repeat sleps 1 and 2 1,400 kc Rock gang C4 (osc.) 2ND I F TRANS C12 03 455 KC. C 3 C I OSC ANT. (TOP) (BOT) .- “.jrrr.r_I C4 0SC uoo kc

6、 J A rubber band should be placed around each tube lor cushioning. Fig. 3Tube and Trimmer Locations Antenna coupling gg 5 loop 600 kc Hock gang LI (oc.) t Repeat steps 4 and 5 * Steps 4 and 5 require a coupling loop from the signal gen erator to leed a signal into the receiver loop located in the li

7、d. This loop should be loosely coupled to the receiver loop antenna so as not to disturb the receiver loop inductance. t ALIGNMENT SHIELD MUST BE USED. (See text.) 2N. DET.-AF-AVC 1U5 V4 OUTPUT 354 + sev. t-d 08 /T -005; -45V. (600 KC) - G V. (I400KC) : l“7 AAA cf- C7 f C8 -L 4 r * R1 X I0OK V 1-1-

8、It- O it K O Jf &S j R3 . 4.7 MEG. j : p: C9 .003 R5 75 T 68K R7 4.7 *1 MEG. RIO 3.3 MEG. *i *HT Lt LZ Ca An in. 2-15 R4- 3.3 MEG. KlOOO 4 voltages Should hold within zo% j WITH RATED BATTERY VOLTAGE. 9 * MEASURED WITH CHANALYST OR voltohmyst, _L ALL VOLTAGES MEASURED WITH RESPECT - TO CHASSIS GND. T LID) T 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN