Western-Auto-Supply-Co-DC2083B 电路原理图.pdf

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1、VOLUME R-21, MOST-OFTEN-NEEDED 1961 RADIO SERVICING INFORMATION WESTERN AUTO Model DC2083B, Exact Service Material. Model DC2173A is the same electrically, while additional Models DC2082B and DC2172A are very similar electrically but do not use clock-switching network. I2BE6 IF 455KC |2BA6 I.F45SKC

2、|2AV6 50 C 5 OUTPUT TRANSFORMER 2.2MEGlc.6 1-047 NECTIONS 400VX B- CHASSIS DC2083B J C-I2B IW lrr#MFD NpTi- =flJ=TT K-1000 OHMS 7 I1 M-MEGOHMS ic ONlJ U ALL VALUES OF C ARE IN 01 MICROFARADS UNLESS OTHERWISE NOTED + DENOTES B- - * DENOTES CHASSIS GROUND ALIGNMENT r Equipment required: Modulated RF s

3、ignal generator; output 1 meter; insulated screwdriver, two .1 mfd 600 volt con- r densers. To insure proper alignment, a radiated signal 1 will be required during part of the alignment procedure. r To radiate a signal, connect a loop of about 6 inches in diameter (two or three turns of #18 or #22 w

4、ire) across the output of the signal generator, and place this loop parallel to the loop of the receiver to be aligned, at a distance of about 10 or 12 inches. Connect the output meter and signal generator as follows: Output meter: Connect across the speaker voice coil and turn the volume control to

5、 maximum (extreme clockwise position). Signal generator: When the generator is not used to radiate a signal, connect the low side to Bthrough a .1 mfd condenser, clip the high side through a . 1 mfd 600 volt condenser to the point at which signal injection is required, and keep the output as low as

6、possible. Pro ceed in the sequence shown in the alignment chart. ALIGNMENT PROCEDURE CHART 97VAC 37VAC 25VAC I2VAC The chassis is attached to the front panel and must be re moved from the cabinet before alignment can be performed. To remove the front panel from the cabinet remove the two screws on b

7、ack of cabinet. C-2 TRIMMER n 1500 KC , | pi t-4 TRIMMER 1650 117 V AC 60 CYCLES I ! ! 30 WATTS AC OUTLET Step Connect High Side of Signal Generator To- Set Signal Generator To- Turn Receiver Dial To- Adjust The Following for Maximum Output (Keep Signal From Signal Generator As Low As Possible) i An

8、tenna Section Tuning Condenser in . Series with .1MFD. Cond. 455 KC. Full Counter Clockwise (Condenser Plates Fully Open) Top and Bottom T2 and T1 (I.F. Transformers) 2 1650 KC. C4 (Oscillator Trimmer) 3 Use Radiated Signal I 1500 KC. Maximum Signal Approx. 1500 KC. C2 Antenna Trimmer) 4 161 Repeat Steps 2 and 3 收音机爱 好者资料库 RadioFans.CN