Sears-Roebuck-and-Co-52853350 电路原理图.pdf

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1、VOLUME R-20, MOST-OFTEN-NEEDED 1960 RADIO SERVICING INFORMATION Sears, Roebuck 1 3/4 TURN AROUND DRUM Sears, Roebuck & Co. Models 9214, 9215, 9217A, 9218A, Chassis 528,53350 ALIGNMENT PROCEDURE Output meter reading to indicate 0.05 watt across voice coil .0.4 v. Generator ground lead con nected .to

2、chassis Generator modulation . . . .30%, 400 cycles Position of volume control . . .fully on. Position of dial with tuner ful ly clpsed. Dial should be fully counter clockwise. Pointer should be at 550 Kc mark on dial. Position of Generator Generator Tuner Freq. Connection Adjustments (in order show

3、n) For Max. Output Max. Microvolts Input to produce .05 * w. output 1400 Kc 1400 Kc 600 Kc 600 Kc Min. Cap. 455 Kc Pin #6 of T2 (top and 5000 1 _ 1U4 1. F. Amp. bottom) : Min Cap. 455 Kc Pin #6 of T1 (top and 250 in r-|j L! f 1R5 Conv. hottom) _ Min. Cap 1625 Kc Stator ant. C2B (T) J I tuner / IIIBJ

4、 00 Kc 1400 Kc Hazel tine C2A (T) 900 uv/m / “l W Test Loop / - 500 Kc 600 Kc Hazeltine L2 900 uv/m *1* _ Test Loop selector (Rock variable condenser back and forth through the signal while adjusting core in oscillator coil, L2). NOTES i vicvts or e*ci?o m mto iM(I) otmc hotco lia.ii* i ovFOn switch on vOluhc eowrwoi S SZt.StSO MCM0 MTtv MiTCh 900 uv/m / S 900 uv/m station SELECTOR nn _INPUT TMNS._OUTPUT TRANS._ 137 收音机爱 好者资料库 RadioFans.CN