Zenith-Radio-Corp-7GT40Z2 电路原理图.pdf

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1、ant sec no; ,*occ i 4 | SWITCH ON VOLUME CONTROL VOLUME R-22, MOST-OFTEN-NEEDED 1962 RADIO SERVICING INFORMATION 95-1877 TRANSFORMER! 95-1873 iCILLATO 95-1879 3rd I.F. TRANSFORMER U 2 105 NTEGNET 121-64 DRIVER 11 152 收音机爱 好者资料库 RadioFans.CN VOLUME R-22, MOST-OFTEN-NEEDED 1962 RADIO SERVICING INFORMA

2、TION ZENITH RADIO Model Royal 400, Chassis 7GT40Z2, Continued 121-179 MIXER 121-180 1ST I E I2I-I8I 2ND I F I 7/11 Is si I -4 -i.#rK-vw- /“KmSOK - Mrf W 4m I ,aa tl l f-pi- 121-64 DRIVER 121-61 OUTPUT MATCHED * 3T1 i 2XC05 C1 * C6 I- “X TT- H:2 T IATTERT CUMCNT ORAM APPROX. IS MA. ITH VOLUME CONTROL

3、 AT MIN. M ll AND U2 LEADS, LINE UP ACCORD INC TO THE PANT NO. AS SHOW. 105-46 t I * i vvwt -HF- 10% T C13 U 6MFD 121-61 |bbk OUTPUT 110% -i CIA ,oo MATCHED i-NAA. + 50 MFD i 6V SWITCH ON VOLUME CONTROL Rl 121-185 I osc. ALL RESISTWS AM 2C4, TOUAANCf. CARBCn. i/t WATT ULf $1 OTKMTWISE SPtCIFKO. O.C.

4、 VOLTAGES SNCMI ARE MASUtEO FAOA CHASSIS ITN NO SIGNAL USING AN A.r.O.C. 0* VACUUM TUBE VOLTMETfl. ) Z8 BATTERIES REO0 *T -: CHASSIS INFORMATION CHART T 1COLLECTOR -BASE I-EMITTER PNP TRANSISTORS Transistor Chassis Layout Color Dot Label Color Crystal Part Diode Output- Supplier No. Mixer Osc. lstl.

5、F. 2nd I.F. Detector Driver Output R.C.A. Black Zenith 121-179 121-185 121-80 121-181 103-19 121-64 121-61 102-8126 RETMA 2N1527 2N1525 2N1525 2N1525 1N87G 2N407 2N407 R.C.A. Type PNP PNP PNP PNP PNP PNP VARIABLE CAPACITOR- CIA AMT.TRIMMER1 CIC OSC. TRIMMER T6 OSC TRANSFORMER SPEAKER LEADS T 2,_ - T

6、$ 01 20 01 20 Ol 20 06 06 06 64 30 04 SO 04 SO AN7ENNA LOOP ASSEMBLY Tl 1ST I.F. TRANSFORMER -72 2ND I.F. TRANSFORMER -75 3RD I.F. TRANSFORMER This transistor portable chassis is a conventional super heterodyne receiver using an individual mixer and os cillator to produce the 455Kc intermediate freq

7、uency. The first and second intermediate frequency amplifiers are conventional. A (103-19) is used as the diode de tector and AVC voltage source. This is then followed by a driver stage and a class B” pudi-pull output stage. As you can see from the chart, the chassis uses a pair of matched transisto

8、rs in the final output stage and therefore should one transistor fail, both transistors must be replaced simultaneously as chances are they will not perform properly unless so matched. ALIGNMENT PROCEDURE TRANSISTOR & TRIMMER LAYOUT Input Signal Frequency Connect Inner Conductor From Oscillator To C

9、onnect Outer Shield Conductor From Oscillator To Set Dial At Trimmers 455 KC Chassis 600 KC Adj. T1.T2, T3 for maxi- ONE mum output. 1620 KC TURN LOOSELY COUPLED Gang wide open. CIC 535 KC TO WAVEMAGNET - Gang Closed Adjust slug in T6 REPEAT STEPS 2 & 3 1260 KC 1260 KC CIA 153 收音机爱 好者资料库 RadioFans.CN