RCA-Victor-Co-Inc-BK41 电路原理图.pdf
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RCA-Victor-Co-Inc-BK41 电路原理图.pdf
MANUAL OF 1940 MOST POPULAR SERVICE DIAGRAMS RCA Victor MODELS BK-41 and BT-41 Cathode-ray Alignment is the preferable method. Connections for the oscillograph are as follows: Vertical “Hi” to E on the 2nd I-F transformer, Vertical “O” to chassis. Output Meter Alignment.If this method is used, connect the meter across the voice coil, and turn the receiver volume control to maximum. Test-Oscillator.For all alignment operations, connect the low side of the test-oscillator to the receiver chassis, and keep the output as low as possible to avoid a-v-c action. For additional details, refer to booklet “RCA Victor Receiver Alignment.” Pre-setting Dial.With gang condenser in full mesh, the pdinter should be horizontal. Model BK-41 Steps Connect the high side of test-oscil lator to Tune test-osc, to Turn radio dial to Adjust the follow ing for max, peak output No. 1 1N5-G I-F grid cap, in series with 0.01 mfd. 455 kc Quiet point L7 and L8 (2nd I-F transformer) No. 2 1A7-G lst-det. gnd cap in series with 0.01 mfd. 455 kc 650-760 kc L5 and L6 (1st I-F transformer) No, 3 Antenna lead, in series with 200 mmfd. 600 kc 600 kc L4 (oscillator) L2 (antenna) No. 4 Antenna lead, in series with 200 mmfd. 1,500 kc 1,600 kc C16+ (oscillator) CS (antenna) t Trimmer Cl 6 on gang condenser should be unscrewed one com plete turn from tight, before adjusting C15. WW4R PLUG-IN RESISTOR 4 . SV / POWER /switch fi TRANS. r jr 4tr 4r Schematic DtajramModel CV-40 Precautionary Lead Dress 1. Red lead from second i-f transformer to screen terminal of 1N5-G must be dressed close to and along edge of chassis. 2. Twisted green wire from antenna coil to gang must be 9 turns and kept clear of rotor. 3. Blue and green leads to volume control must be dressed close to chassis and between gang and front apron. 4. The opening in the shield of the 1N5-G should be turned away from the chassis and the i f transformers. 5. Antenna and ground wires shoud be twisted together. 1H5-G 1Q.5-GT 2“*DET. A.F A.V.C. OUTPUT 3 4 BOTTOM VIEW OF _ _ (98V) trans. u TUBE SOCKETS *) cio * 61 v. /r94.v.) C)E * 007 MFD. Z 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN
