Federal-Telephone-and-Radio-Corp-1540T 电路原理图.pdf

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1、GREEN 1947 MOST-OFTEN-NEEDED RADIO DIAGRAMS Federal Telephone E ExOEX o esexxo ox o y o oo o O O O E - o XOCBC* 0-0 4.4 I 004-4 CBOOO oo I C- O -4 o . CB Ch o CIC- C- CB 0 04 . OCBOfOO 4-CBC0WHCBC0U) OC-OOO.H.H.HHy-.HCB jHCB fO r-uo Q y -H MO O OM o M * t. OM* * X u up OU4-4 o p P 0 p p p a u ,too Q

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3、aapoc pUU -4 x Ck pa * X p *“ *c - a .H 4*-*.4*- 91 gX-X c* X O o o E y y fc*t: gt: guu E E Ein B E* E - y-H I u a I O y p p a ay lU , o-rle o o 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1947 MOST-OFTEN-NEEDED RADIO DIAGRAMS -58V D-C OV 22K o.en. 0 V + 83V D-C OA NOTE 1 -0.2V D-C 1.5 MEG 1 478V D-C NOTE 1 1

4、2SA7 GT/G r 1 + 80V D-C NOTE 1 Federal Telephone MODELS I030T AND I540T 1. Resistance readings at these points will vary since they are in series with the leakage of the electrolytic condensers which is subject to change. 2. All D.C. measurements were made with a meter having a sensitivity of 20,000

5、 ohms per volt. A.C.measurements were made with a lOOt) ohms per voltnetei . 3. Measured values are from socket pin to circuit ground, (pin 8 of 12SQ7 socket). 4. Tolerances of component values make possible a variation of i 20% in readings Punch marks are provided on the dial back plate at 600kc, l

6、OOO kc, 1400 Kc and 1600 Kc for align ment purposes . With tuning condenser completely open, set dial pointer to 1600 Kc punch mark. Connect output meter across voice coil terminals on speaker frame. Connect lav side of signal generator lead thru a 0.1 mfd coupling condenser to chassis ground. Conne

7、ct high side of generator thru proper dummy antenna to the receiver external antenns connec- t ion. Keep signal generator output at lowest practical level and proceed according to table below. ALI6HMENT CHART DUMMY antenna S tGNAL GENERATOR FREQUENCY BAND SWITCH POSITlON RECEIVER D I AL SETTING ADJU

8、STMENT PO1 NTS OUTPUT METER READ ING 0.1 MFD. 455 Kc B.C. Tuning Condenser Open C24,C23,C22,C21 Max. 0.1 MFD. 455 Kc B.C. Tuning Condenser Open L4 Min. 200 MMFD. 1600 Kc B.C. Tuning Condenser Open C6 Max. 200 WMFB. 1400 Kc B.C. 1400 Kc C3 Max. 200 MM. 600 Kc B.C. 600 Kc LI (Check, ad just if necessary) Max. 400 ohms 6 Me s.w. 6 Me C5 Ktax. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN