Emerson-Radio-and-Phonograph-Corp-937B 电路原理图.pdf

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1、VOLUME R-21, MOST-OFTEN-NEEDED 161 RADIO SERVICING INFORMATION EMERSON RADIO Model 933B, Chassis a22BtS4.i 118 VOLTS AC ONLY (60 CPS) V-1 25L6 6T RE CORO PLAYE R ON VOLUME CONTROL SW-1 STOP AT 37.8 K t 31 .113 V c:* R-1- SI . -SP0.* .02V 106 V A* VOLUME 460K1 2 3 4 R-3 25 K C.r 1 Wilt RESISTORS IN O

2、HMS ANO 1/2 WATT, CAPACITORS IN MFOS, UNLESS OTHERWISE NOTEO. * REFER TO CONDI TIONS FOR VOLTAGE S RESISTANCE READINGS (BELOW). SE-1 RECTFIER EMERSON RADIO Model 935B, Chassis v-i REFER TO CONDITIONS FOR VOLTAGE AND RESISTANCE REAOINGS (BELOW). RECORD p,c CHANGER H| TURNTABLE j 120548B 115 VOLTS AC

3、ONLY (60 CPS) AUTOMATIC ON-OFF SWITCH 3WKS / riy cnz R- 1 500K*“ OV jzz- 106V yr-1 A600K VOLUME 460K R-3 25 K 1 vf TONE .047 , 3V RESISTORS IN OHMS AND 1/2 WATT, CAPACITORS IN MFCS, UNLESS OTHERWISE NOTED. MINUS LEAD U SE-1 k RECTIFIER CONDITIONS FOR VOLTAGE AND RESISTANCE READINGS 1. Voltoges indic

4、ated are positive d.c., resistonees in ohms, unless otherwise indicated. 2. Measurements mode with voltohmyst or equivalent. 3. All measurements token from pin to B minus unless otherwise indicated. 4. Voltage measurements token with: a) Line voltage maintained at 115 volts o.c. b) Volume control se

5、t for maximum volume. 5. Resistance measurements taken with: a) Power line cord disconnected from outlet. b) Volume control set for maximum volume. 6. Nominal tolerance on component values mokes possible a variation of 15% in voltage and resistance reodings, 7. N.C. denotes no connection, K is kiloh

6、ms, Meg. is megohms. 8. Resistances marked with * vary due to capacitor chorge. Allow about 30 seconds for meter to settle* EMERSON RADIO Model 937B, Chassis 120558B DISASSEMBLY INSTRUCTIONS 1. Remove 2 Phillips head serews used to secure record changer to cabinet. 2* Lift changer and cardboard moun

7、ting escutcheon up and tilt backwards. Do not disconnect ony leods. 3. Remove both volume control knobs from cabinet front. 4* Disconnect leods for both the left and right channel loudspeakers from their respective output tronsformers. _ NOTE: Care should be taken to mark all speaker F leads before

8、disassembly to insure their proper con* * nection during re*a$embly. * , 5. Remove two polnuts used to secure chassis to cabi* ! net and free line cord from fishpaper harness stapled *“ L to cobinet. I Slide chassis to rear and lift both record changer and chassis from cabinet. 7R-I VOLUME I 2MEG OSH LEFT CHANNEL TURNTASII gT5%.tiLLpW_ WjSS I 3V -L NOTH CORRECT PHASING OF SPEAKERS MUSTS! FOR OETAILS REFER 1. _ PHASING ON PAGE I. 41 收音机爱 好者资料库 RadioFans.CN