Emerson-Radio-and-Phonograph-Corp-G-1707 电路原理图.pdf

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1、VOLUME R-24, MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION ANT - V I-1 EMERSON Model G-1707 R F AMP % 120T8 0R12AT7 15N-790 5% OSCILLATOR V2 120T8 OR I2AT7 V-IB MN-75010% 73V I I ,4 -=*U ) r -2.5VV I / l_l_J 490 20% (Continued on next page at right) ALIGNMENT INSTRUCTIONS 7, PASSBAND 10.7 MC F.

2、M. OETECTOR CURVE 1) Allow chassis and equipment to be used at least 15 minutes for warm-up. 2) Maintain output of signal generator at a point no higher than required to produce a usable reading and use only insulated alignment tools for ad justing. 3) Use an isolation transformer between the chassi

3、s and the AC line, if ovoilable. If no isolation transformer is to be used, insert a .1 mfd. capacitor in series with the signal generator output cable to prevent FIG. 1 shock and to protect the equipment. pM ALIGNMENT USING AM SIGNAL GENERATOR AND VTVM FM IF ALIGNMENT USING FM SIGNAL GENERATOR AND

4、OSCILLOSCOPE FREQUENCY MODULATE THE IF SIGNAL WITH A 60 CYCLE SINE WAVE TO A TOTAL DEVIATION OF 450 KC. ADJUST THE OSCILLOSCOPE INTERNAL HORIZONTAL DEFLECTION VOLTAGE TO 120 CYCLES. AND SYNCRONlZE IT WITH THE 60 CYCLE SINE WAVE. Signal GENERATOR COUPLING 10.7MC (4S0 POINT OF NON- VERT AMp TO KC TOTA

5、L INTERFERENCE POINT DEV.) . DISCONNECT STABILIZING CAPACITOR 2MFD. ADJUST FOR CURVE OF MAXI MUM AMPLITUDE AND SYMMETRY SIMILAR TO FIG. 1. RECONNECT STABILIZING CAPACITOR 2MFD. ADJUST SO THAT 10.7MC OCCURS AT CENTER OF CROSSOVER LINES SIMILAR TO FIG. 2. SLIGHTLY RE TOUCH T3 FOR MAX. AMPLITUDE AND ST

6、RAIGHTNESS OF CROSSOVER LINES, PROCEED WITHSTEP S. 108MC (SLUGS OUT) DC PROBE TO POINT T1. T2 ADJUST FOR MAXIMUM DEFLECTION. COMMON TO CHASSIS 8BMC (SLUGS IN) PADDER FLAPS MOVE PADDER FLAPS CLOSER OR FURTHER FROM OSC. ft RF COILS FOR MAX. DEFLECTION. REPEAT STEPS S-ftt FOR HIGHEST READING. 收音机爱 好者资料

7、库 RadioFans.CN VOLUME R-24, MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION EMERSON RADIO Model G-1707, Continued from preceding page, at left. 2 I F AMP 12BA6 note: iheo diodes ARE A MATCHED PAIR. 470*10% IN-60 WATCHED PAIR IOOK*S%t 4/A HU RESISTORS USED FORw * V*W ALIGNMENT ONLY. REMOVE AFTER C

8、OM- n/ PLETION OF ALIGNMENT. AUDIO OUTPUT 50C5 V-5 J. 5.2/1 V.C. PM SPEAKERS 62 200 MA T W SIL. RECT .01MF I MW OW-OFF SWITCH OH VOLUME CONTROL 680H .AAA A_ 84V ZW T 80 + 50 MFD J* MFD 150 V 150V ates ALIGNMENT POINTS V v v REFER TO ALIGNMENT PROCEDURE ALL RESISTORS VtWATT 20% TOTAL UNLESS OTHERWISE

9、 SPECIFIED. ALL CAPACITOR VALUES IN MMF UNLESS OTHERWISE SPECIFIED. VOLTAGE READINGS TAKEN WITH VTVM NO SIGNAL INPUT AND LINE VOLTAGE SET TO 117V AC. AC INTERLOCK 50C5 AUDIO OUTPUT 12BA6 2NJ.F. EBtopi LjQ) EEHieoT)/ 2ND I.F. / * ( v _J HEH RATIO V DETECTOR H31 () N_ 1ST I.F. (v7 SEja 12DTS FM RF 1000 SAMP a MMF OSC B+ TEST POINT R-F AMP FM OSC. PADDER FLAP J S-1A l.E TUNING (PRIMARY) FM RF PADDER FLAP f FM RF 3TRIMMER FM OSC TRIMMER UNDERSIDE VIEW OF FM TUNING UNIT TUBE LOCATION AND ALIGNMENT POINTS 收音机爱 好者资料库 RadioFans.CN