Westinghouse-Electric-Corp-WR-674 电路原理图.pdf

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1、MANUAL OF 1940 MOST POPULAR SERVICE DIAGRAMS Westinghouse Model WR-674 Tube Location Note: Values with star (*) are operating voltages. Values not starred are actual measured voltages. Measurements are made to chassis MnliHM otherwise indicated, with set tuned to quiet point. BOTTOM View- REAR OF CH

2、ASSIS 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, keep the output as low as possible to avoid a-v-c action. Pre-setting Dial.With gang condenser m full mesh, the

3、 pointer should be horizontal. Precautionary Lead Dress. 1. Dress speaker leads down to chassis. 2 The green lead from the loop to the antenna section of the gang should be dressed between the output and detector tube shields and pulled toward the far comer of the loop by means of the rubber band. 3

4、. The spiral shield on the lst-A.F. grid lead should be brought as close as possible to the grid cap. 4. Leads to the high side and tap of the volume control should be dressed down to the chassis and away from the output tube plate lead. Antenna.An antenna and ground may be connected to “A*, and “G”

5、 at bottom of cabiuet. If total length of antenna and lead-in is more than 150 feet, connect a 300 mmf capacitor m senes with lead-in. 1A7-G 1N5-G 1*TDET.fUOSC. 1.F.AMPL. Steps Connect the high side of test- oscillator to Tune test-osc. to Turn radio dial to- Adjust the follow ing for max. peak outp

6、ut 1 1N6-G grid cap, in series with .001 tnfd. 455 kc Qniet point between 550-750 kc L5 and L6 (2nd I-F transformer) 2 1A7-G grid cap, in series with .001 mfd. 455 kc L3 and L4 (1st I-F transformer) 3 Assemble chassis and batteries in correct position in cabi net, and fasten rear cover (loop) in pla

7、ce while making the following adjustments, which are accessible through holes in the bottom of the cabinet. 4 Antenna terminal, iu series with 1500 kc 1500 kc* C17 (om.1 Cl (ant.) 5 200 mfd. Connect low side of test- osc. to “G” term. 600 kc 600 kc* L2 (osc.) Rock in 6 Repeat steps 4 and 5. * Use bottom of 1* use center of the last 1H5-G “1500” for 1500 kc calibration point, and in “600” for 600 kc calibration point. 1C5-G 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN