Sylvania-Electric-Products-1-603-2 电路原理图.pdf

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1、MANUAL OF I9S4 MOST-OFTEN-NEEDED RADIO DIAGRAMS SYLVANIA ELECTRIC PRODUCTS INC. Chassis 1-603-1 and 1-603-2 (Continued on page 121) FM IF ALIGNMENT STEP SIGNAL GENERA Connection TOR Freq. OR Freq. OSCILLOSCOPE CONNECTION ADJUST OUTPUT READING COMMENTS 1. Loosely couple mark er to pin 1 of 1st IF Amp

2、. - 6BA6 10. 6MC 10.7MC 10. 8MC To pin 1 of 1st IF Amp. - 6BA6 10.7 MC Thru detector cir cuit of Figure A to pin 5 of 2nd IF Amp. - 6AU6 T3 - F T3 - E Response curve of Figure B Connect 500 ohm resistor from pin 5 to pin 6 of 2nd IF Amp. - 6AU6. Obtain maximum vertical amplitude for response curve.

3、Set sweep generator for approxi mately 500 KC to 1 MC sweep. D MM 10.6MC 10. 7MC 10. 8 MC To pin 7 of Osc. Mixer - 6BEG. 10. 7 MC Same as 1. T1 - B T1 - A Response curve of Figure B Same as 1; reduce sweep generator output to avoid AVC distortion of response curve. 1 Loosely couple mark er to pin 1

4、of 2nd IF Amp. - 6AU6. 10. 6MC 10.7MC 10. 8MC To pin 1 of 2nd IF Amp. - 6AU6 10.7 MC Across de-em- phasls capaci tor, C37 .0033 Mfd. T5 - K T5 - J Response curve of Figure C REMOVE 500 OHM RESISTOR ADDED FOR STEP 1. Center 10. 7 MC marker. Obtain maximum linear output for response curve. FM RF ALIGN

5、MENT STEP TUNING CAPACITOR POSITION OUTPUT METER CONNECTION ADJUST OUTPUT READING COMMENTS 1. Thru resistor net work of Figure D to FM antenna terminal board. 108. 5 MC Fully open Across speaker voice coil. C9 Maximum Set Volume control to full CW position and set Tone control to full CCW ponl- tion

6、. Use a 400 cycle modnlated sig nal. Keep generator output at lowest usuabie value. Leave AM loop antenna leads connected during FM RF alignment. D Same as 1. 108 MC 108 MC Same as 1. C8 Maximum Same as 1 using printed calibration dial on chassis assembly to properly ponition tuning capacitor. 1 Sam

7、e as 1. 87. 5 MC Fully closed Same as 1. L5 coil Maximum Same as 1 spiking (squeezing or spread ing turns of coil) L5 for maximum output reading. Use a non-metaiic pick for this adjustment. Same as 1 88 MC 88 MC Same as 1. L4 coil Maximum Same as 2 spiking (squeezing or spread ing inrns of coil) L4

8、for maximum output reading. Use a non-metaiiic pick for this adjustment. AM ALIGNMENT STEP TUNING CAPACITOR POSITION OUTPUT METER CONNECTION ADJUST OUTPUT READING COMMENTS 1 Thru . 1 Mfd. capaci tor to pin 7 of Osc. - Mixer - 6BEG. 455 KC Fully open Across speaker voice coil. T4 - H T4 - G T2 - D T2

9、 - C i Maximum Set Volume control to full CW position and set Tone control to full CCW position. Use a 400 cycle modulated signal. Keep generator output at lowest usuabie value. 1 Radiated to receiver thru a wire loop of several turns, or: Thru a 50 Mmfd. cap acitor to AM antenna board. 1650 KC 1650 KC Same as 1. C12 Maximum Same as 1 using printed calibra tion dial on chassis assembly to properly ponition tuning capacitor. Same as 2. 1400KC 1400 KC Same as 1. Maximum 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN