Firestone-Tire-and-Rubber-Co-4-C-29 电路原理图.pdf

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1、VOLUME R-17, MOST-OFTEN-NEEDED 1957 RADIO SERVICING INFORMATION THE FIRESTONE TIRE & RUBBER CO. STOCK NO. 4-C-29 CODE NO. 120-6-TT600 1. Turn off receiver. Close the variable gang conden ser by setting the tuning knob to 5.5 on the dial scale. 2. Remove the back cover and batteries. 3. Remove the sp

2、eaker securing bracket by removing the two round-head screws from the “A” battery side of the receiver. 4. Remove the tuning knob by pulling the knob straight off the tuning shaft. 5. Remove the three flat head mounting screws un derneath the tuning knob. 6. When replacing tubes be sure red dot on t

3、ube base is positioned to match dot of tube location chart. Fig. 2. FIG. 3 ALIGNMENT PROCEDURE Volume control Maximum, all adjustments. Connect dummy antenna in series with output lead of signal generator. No signal applied to antenna. Connect ground lead of signal generator to chassis. Dial Setting

4、 Generator Frequency Dummy Ant. Generator Connection Trimmer Adjustment Trimmer Function l. Fully open 455 KC .1 MFD 1AH4 Grid Maximum Output I.F. Top & Bottom 2. Fully open 455 KC .1 MFD 1V6 Grid Maximum Input I.F. Top & Bottom 3. Fully open 1610 KC .1 MFD 1V6 Grid Maximum Oscillator Trimmer 4. Tune in signal from generator 1400 KC Loosely couple signal generator to “Magna Loop” Maximum Antenna Trimmer Repeat alignment procedure as a final check. 35 收音机爱 好者资料库 RadioFans.CN