General-Electric-Co-641 电路原理图.pdf

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1、MANUAL OF 19S4 MOST-OFTEN-NEEDED RADIO DIAGRAMS GENERAL ELECTRIC . MODEL 640 AND 641 PORTABLE RADIO RECEIVERS If Continued on the next Jj a Page, adjacent at right. CHASSIS KEMOVAls 1. Remove the two control knobs. 2. Remove the hex head screw in cabinet bosses at each side of chassis. 3. Remove two

2、 hex head screws holding chassis support brackets to bosses in bottom of cabinet. 4. Disconnect audio output leads from loudspeaker and re move complete chassis with brackets. a: .31 = 3 2 S A x. S iu oo ku InSsw x. x3 z9 6 t 5 wesi jh / * ui uj 5 (Sac in S f.soa i irr SWuitnUK 7 anps O S , Hjio So

3、/ / 1 2o2t E / / irE * / w 收音机爱 好者资料库 RadioFans.CN Components and Adjustments, Top View MANUAL OF 1954 MOST-OFTEN-NEEDED RADIO DIAGRAMS GENERAL ELECTRIC COMPANY bqttom shield removal 1. Remove the hex head screw in cabinet bosses at each side of Models 640 and 641 chassis. . 2. Remove the three snap

4、 fasteners holding shield to back Continued from preceding edge of chassis page, adjacent at left. 2. Remove the hex head screw holding bottom shield to each end of chassis. 4. Withdraw shield to position exposing chassis components. ALIGNMENT CHART Always have volume control full on and reduce sign

5、al input so A-V-C will not affect output. Adjust for Maximum Output Test Osc. Setting Pointer Setting 550 KC Test-oscillator Connected to 1T4 (V3) I-F grid (pin 6) in series with .05 mfd. and B bus. Iron cores of 2nd I-F Transformer, T2. 455 KC 2 1R5 (V2) converter grid (pin 6) in series with .05 mf

6、d. and B bus. 1T4 (Vl) R F amplifier grid (pin 6) in series with .05 mfd. and 4 B bus. 5 455 KC Iron cores of 1st I F Transformer, Tl. 550 KC 1670 KC Gang condenser (CIA, B, C) fully open ClB oscillator trimmer. 1500 KC For max. output ClC R-F trimmer. Core of T4. 580 KC For max. output 6 Repeat steps 4 and 5 to give maximum output. 1500 KC Cl A antenna trimmer. Inductively coupled to loop, LI FASTENER T3 RTO- V4 IU5 DET. AUDIO T2 RTL-079 POWER CORD RWL-005 收音机爱 好者资料库 RadioFans.CN