Emerson-Radio-and-Phonograph-Corp-870B 电路原理图.pdf

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1、VOLUME R-18, MOST-OFTEN-NEEDED 1958 RADIO SERVICING INFORMATION Emerson Radio MODELS 851B, 870E 874 B CHASSIS 120363A REPAIR OF COUPLATES Whenever possible couplates should be repaired instead of replaced. This practice could readily become o time saving factor. Example *1 Shorted .005 mfd condenser

2、 C-6. Clip off pin 6 of couplate from printed board. This removes C-6 and R-7 from the circuit. Insert a regular 470K ohm Yi watt re* sistor from B-neutra! (Pin 4 of Coup* late) to pin 2 of V-4 and a regular .005 mfd 400V condenser from pin 2 of V*4 to pin 5 of Couplate. Example *2 Open R*7 470K ohm

3、 resistor. Insert regular 470K ohm Yi watt resistor across pins 4 and 6 of Couplate. ! I 4.Q Ln * 8 d 1 O t +i +j +j U 5 fl u O w .2uuu 2 22X2 Z xxox oooo: 82*8, So 5“ 11 g ) n Jcc, i 3 2 s l E x ; c 5 . .JZ ) OlLlLU 3 ax *-.2 5 o u *.-o-o i e *JON Ul * s D H 2 to 80 o o m U. u H . cm e a oo 5 u . u

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