Crosley-Corp-C-35-AK 电路原理图.pdf

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1、MANUAL OF 1941 MOST POPULAR SERVICE DIAGRAMS LOOP ANTENNA zi| :wo JF“ !i-JIB. 2N0.I-F TRANS. _7_r PHONO MOTOR The Crosley Corp. Model C-35AK I5MFJI5MF JL, JL 50L6 I2SK7 I2SA7 I2SQ7 HEATER CIRCUIT ALIGNMENT PROCEDURE The chassis of this receiver is connected to one side of the power supply and for th

2、is reason all test equipment should be thoroughly insulated in order that the power supply will not become short circuited while aligning the receiver. CONNECTING OUTPUT METER Connect one terminal of the output meter to the plate and the other terminal to the screen of the 50L6GT output tube. Be cer

3、tain that the meter is protected from D.C. by connecting a condenser (.1 mfd. or largernot electro lytic) in series with one of the leads. TUNING l-F AMPLIFIER TO 455 KILOCYCLES la) Connect the output of the signal generator through a 100 mmf. condenser to the antenna connection (Blue or Red lead ex

4、tending from rear of loop) on the receiver. Do not use a ground return from the signal generator unless it is found to be absolutely necessary. If it is found to be necessary, a small condenser (approximately .001 mfd.) should be connected in series with the ground terminal of the signal generator a

5、nd the receiver chassis. (b) Set the station selector so that the plates of the condenser gang are completely out of mesh and turn the vol ume control to the right (ON). (c) Set the signal generator to 455 kilocycles. (d) Adjust the 2nd I-F trimmer condensers located on top 2nd I-F Assm. item 7, for

6、 maximum reading on the output meter. (e) Adjust the 1st I-F trimmer condensers, located on top of 1st I-F assy., item 6, for maximum output. (f) Repeat operations (d) and (e) for more accurate adjustments. ALWAYS USE THE LOWEST SIGNAL GENERATOR OUTPUT THAT WILL GIVE A REASONABLE READ ING ON THE OUT

7、PUT METER. ALIGNING THE R-F AMPLIFIER (a) Set the signal generator to 1650 kilocycles. (b) With the condenser gang turned to the minimum capacity position, adjust the trimmer condenser B. C. OSC so that the 1650 kilocycle signal is heard. It is not necessary that the receiver tunes through this sign

8、al. (c) Set the signal generator to 1400 kilocycles. (d) Tune-in the 1400 kilocycle signal in the region of 140 on the dial for maximum output. (e) Adjust the trimmer condensers B. C. “ANT” for maximum output. NOTE: Do not readjust the “OSC” trimmer. (f) Repeat operations (d) and (e) for more accurate adjustments. Am compiled by m. n. beitman, supreme publications for maximum output. 收音机爱 好者资料库 RadioFans.CN