Sylvania-Electric-Products-4703 电路原理图.pdf

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1、VOLUME R-20, MOST-OFTEN-NEEDED 1960 RADIO SERVICING INFORMATION SYLVANIA Chassis 1-635-1, Model 4703, Material continued on next two pages. RECORD COM* TONE AM/FM TUNINO SYLVANIA Chassis 1-616-2, Model 3406, Alignment (Continued) CHASSIS REMOVAL locted V h 1. Remove volume and tuning knobs by pul li

2、ng straight out. 2. Unsnap buttons securing back flap, lift flap and remove large battery case as far as leads permit. 3. Remove four (4) nuts and insulating washers securing chassis to case, (2) 4 1 I A U II P U 7 located left edge of board, (1) located center of board and (1) located lower , . rig

3、ht corner of board. Remove chassis from case. (Speaker and clock lead lengths permit removal of chassis from lap, lift case without unsoldering. If necessary y case as to remove chassis from case completely, identify all leads, unsolder speaker isulating leads at speaker, clock leads at ter- case, (

4、2) minals on chassis. ALIGNMENT PROCEDURE- ALIGNMENT SETUP NOTES Set variable tuning ca pacitor plates fully open (minimum capacity). TEST EQUIPMENT HOOKUP SIGNAL GENERATOR - radiate signal to receiver through a loop consisting of several turns of wire in series with a ISO Ohm resistor. Set gen erat

5、or frequency at 455 KC. ADJUST FOR MAXIMUM VOLUME In order shown T4, T3, T2 Repeat for optimum perfor mance . Set dial to approximately SIGNAL GENERATOR - radiated C4 (oscillator trimmer) 16 50 KC. to receiver as in step 1. Set generator frequency at 1650 KC. Set dial to a frequency between 1400 KC

6、and 1500 KC. dial to 600 KC SIGNAL GENERATOR - radiated C2 (antenna trimmer) to receiver as in step 1. Set generator to a frequency corresponding to receiver dial (until signal is heard) through receiver speaker.) SIGNAL GENERATOR - radiated LI (oscillator coil) while to receiver as in step 1. simul

7、taneously rocking Set generator to 600 KC and tuning capacitor through the tune for maximum volume. 600 KC position. 141 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN VOLUME R-20, MOST-OFTEN-NEEDED 1960 RADIO SERVICING INFORMATION SYLVANIA Chassis 1-635-1, Model 4703, Alignment, Continued AM ALIGN

8、MENT STEP SETUP NOTES TEST EQUIPMENT HOOKUP Selector Switch SIGNAL GENERATOR * hot lead through a .1 Mfo capacitor to in AM position Pin 7 of V6. Ground lead to chassis. Set generator to . 455 KC. Variable tuning CAPACITOR FULLY OPEN AC VOLTMETER . ACROSS AUDIO OUTPUT TRANSFORMER. Pin 7 of V6. Groun

9、d lead to chassis. Set generator to 1620 KC. AC VOLTMETER - ACROSS AUDIO OUTPUT TRANSFORMER Pin 7 of V6. Ground lead to chassis. Set generator to 535 KC. AC VOLTMETER * ACROSS AUDIO OUTPUT TRANSFORMER. OF SEVERAL TURNS OF WIRE. SET GENERATOR TO 1400 KC. ADJUST FOR MAXIMUM 5 Bottom Core T5 top Core T

10、4 * Bottom Core T4 - Top Core CI7 - AM Osc. Trimmer L5 * AM OSC. CO IL Cl 4 AM ANTENNA TRIMMER (LOCATEO ON LOOP ANTENNA) FM ALIGNMENT STEP SETUP NOTES TEST EQUIPMENT HOOKUP SELECTOR SWITCH SIGNAL GENERATOR HOT LEAD TO TUBE SHIELD V2 WHICH HAS IN FM POSITION BEEN DISCONNECTED FROM CHASSIS. GROUND LEA

11、D TO CHASSIS. SET GENERATOR TO 10.7 MC Variable tuning CAPACITOR FULLY AC VOLTMETER - DC PROBE TO POINT A. GROUND LEAD TO CHASSIS. OPEN Same as step 1 SIGNAL GENERATOR - Same as STEP I. AC VOLTMETER - ACROSS POINTS A and b FM ANTENNA TERMINAL. GROUND LEAD TO CHASSIS. SET GENERATOR TO 108.4 MC. AC VO

12、LTMETER - ACROSS AUDIO OUTPUT TRANSFORMER. ANTENNA TERMINAL. GROUND LEAD TO CHASSIS SET GENERATOR TO 87.6 MC. Selector Switch SIGNAL GENERATOR hot* lead through 300 Ohm resistor to FM In FM position antenna terminal. Ground lead to chassis. Set generator to Variable tuning 104 MC. CAPACITOR AT AC VO

13、LTMETER - Same AS STEP 3. CAPACITOR AT 104 MC ANTENNA TERMINAL. GROUND LEAD TO CHASSIS. SET GENERATOR TO AC VOLTMETER Same as step 3. ADJUST FOR MAXIMUM T3 Bottom Core T2 Bottom Core T2 Top Core Ti Bottom Core Tl Top Core T3 Top Core Adjust for zero METER READING. CM FM OSC. TR IMMER L4 FM osc. Coil

14、 Spread or compress loops on COil. C8 FM RF Trimmer L7 - 1st FM RF Co i l Spread or compress loops on coil. Selector Switch SIGNAL GENERATOR - hot lead through a 300 Ohm resistor to FM L3 * 2nd FM RF IN FM POSITION ANTENNA TERMINAL. GROUND LEAD TO CHASSIS. SET GENERATOR TO CO IL 90 MC. Variable tuning spread or compress at 90 MC AC VOLTMETER Same as step 3. loops on coil. 143 收音机爱 好者资料库 RadioFans.CN