Westinghouse-Electric-Corp-WR264 电路原理图.pdf

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1、COMPILED BY M. N. BEITMAN. SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1939 MOST POPULAR SERVICE DIAGRAMS Cathode-Ray Alignment is the preferable method. Connec tions for the oscillograph arc shown in the chassis drawing. I Output Meter Alignment.If this method is used, connect ! the mete

2、r across the voitc-coil, and turn the receiver volume j 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. I Calibration Scale on Indicator - Drive - Co

3、rd Drum. The j tuning dial is fastened in the cabinet and cannot be used for : reference during alignment, therefore, a calibration scale is attached to the rear of the drum which is mounted on the ! front shaft of the gang condenser. The setting of the gang I condenser is read on this scale, which

4、is calibrated in degrees. ; The correct setting of the gang in degrees, for each align- ment frequency, is given in the alignment table. I As the first step in r-f alignment, check the position of I the drum. The 180 mark on the drum scale must be j vertical, and directly over the center of the gang

5、-condenser I shaft when the plates arc fully meshed. The distance from I the front of the chassis to the drum must not exceed Vg-inch. 1 The drum is held to the shaft by mcansof two set screws, 1 which must be tightened securely when the drum is in the ; correct position. Pointer for Calibration Sca

6、le.Improvise a pointer for the calibration scale by fastening a piece of wire to the gang- condenser frame, and bend the wire so that it points to the “180 mark on the calibration scale when the plates are fully meshed. Steps Connect the high side of test-osc. to Time test- osc. to Turn radio dial t

7、o Adjust the following for max. peak output D 6K7 I-F grid cap, in series with .01 nifd. 465 kc “A” band. Quiet Point between 660-760 kc L12and L13 (2nd I-F Trans.) 2 OKS det. grid cap in series with .01 infd. 465 kc LIO and Lll (1st I-F Trans.) B Antenna Terminal, in series with 400 ohms 20 me 20 m

8、e (23) “C”band C21 (osc.)* C30(ant.)* B Antenna Terminal, in series with 400 ohms 6.1 me 6.1 me (31) “B”band C23 (osc.)t 5 Antenna Terminal, in series with 200 mmf. 500 kc 1,500 kc (28i) “A” band C26 (osc.) 6 Follow “Adjustments for Electric Tuning” Dial-Indicator Adjustment.After fastening the chas

9、sis in the cabinet, attach the dial indicator to the drive cable with indicator at the .530 kc mark, and gang condenser fully meshed. The indicator has a spring clip for attachment to the cablc After completion of alignment, seal the i-f core-adjusting screws with household cement. The dial tuning (

10、right hand) push button must be pushed in for steps 1 to 5 inclusive. I * Use minimum capacity peak if two peaks can be obtained. I * Rock gang slightly and use maximum capacity peak if two peaks can be obtained with C30. Check to determine that 1 C21 has been adjusted to the correct peak by tuning

11、to approximately 28 (19.09 me), where a weaker signal should be ! received. I t Use minimum capacity peak if two peaks can be obtained. Check to determine that C23 has been adjusted to the ! correct peak by turning to approximately 49 (5.19 me), at which point a weaker signal should be received. ADJ

12、USTMENTS FOR ELECTRIC TUNING This receiver has seven push buttons. The right-hand button connects the gang condenser for manual tuning. The other six buttons are for electric tuning of six diflPerent sta tions in the standard-broadcast range. The station buttons connect to separate permeability tune

13、d oscillator coils and separate antenna trimmers which must be adjusted for the desired stations. Use an insulated screwdriver or alignment tool for making adjustments. Allow at least five minutes warm-up period before making adjustments. The procedure is as follows: 1. Make a list of the desired si

14、x stations, arranged in order from low to high frequencies. Sec “Tube and Trimmer Locations view for frequency coverage of each button. 2. Push in the dial-tuning button, and manually tunc in the first station on the list. 3. Push in station button. No. 1 (left) and adjust No. I oscillator core (L37

15、) to receive this station. Screw the core all the way in, to lowest frequency, and then un screw slowly until station is received. 4. Adjust No. I antenna trimmer (C36) for maximum output on this station. Qpekwise adjustment of cores and trimmers tunes the cir cuits to lower frequencies. 5. Adjust f

16、or each of the remaining five stations in the same manner. 6. Make a final careful adjustment of the oscillator cores and antenna trimmers. Use the Precision Eye to ensure sharp peaking. BEITMAN. SUPREME PUBLICATIONS 172 V/estinghouso Model WR-264 COMPILED BY M. N. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN