Zenith-Radio-Corp-300 电路原理图.pdf

《Zenith-Radio-Corp-300 电路原理图.pdf》由会员分享，可在线阅读，更多相关《Zenith-Radio-Corp-300 电路原理图.pdf（2页珍藏版）》请在收音机爱好者资料库上搜索。

1、VOLUME R-18, MOST-OFTEN-NEEDED 1958 RADIO SERVICING INFORMATION .fcffimlftaij Chassis 7AT42 & 7AT42Z1 Model Royal 300 (Continued on page 183) CHASSIS IDENTIFICATION The Royal 300 seven transistor portable has been produced with two basic chassis. This expedient was necessary to enable us to produce

2、sufficient quantities by using transistors from several sources. Both chassis have the chassis number stamped on them as well as a color identifying code on the battery compartment just above the battery installation instruc tion label. The 7AT42 chassis uses transistors manufactured by Sylvania. Th

3、e 7AT42ZI chassis uses transistors manufactured by Texas Instrument. In addition to this, both chassis have individual transistor layout labels. The color of the printing on these labels conforms respectively to the color dot on the chassis. The accompanying chart gives all the necessary information

4、 on chassis number, color dot, transistor layout labels, transistor numbers, Zenith part number, RETMA part number (where available), transistor supplier, etc. Chassis ColorDot Transistor Layout Label Color Part No. Mixer Osc. lat. l.F. Tndl.F. Crystal Diode Detector Driver Output- Output Supplier 7

5、AT42 Green Green 102-3498 n 103-19 1N87G 121-8 2N35-2N35 Matched Pair NPN NPN 7AT42Z1 Red Red 102-3474 121-53 PNP 121-50 NPN 121-51 NPN 103-19 1N87G 121-52 PNP 121-19 Matched Pair PNP PNP Texas Instrument TRANSISTOR & TRIMMER LAYOUT TRANSISTOR & TRIMMER LAYOUT FOR 7AT42 FOR 7AT42Z1 Alignment Procedu

6、re Operation Input Signal Frequency Connect Inner Conductor From Oscillator To Connect Outer Shield Conductor From Oscillator To Set Dial At Trimmers Purpose i 455 KC ONE TURN LOOSELY COUPLED TO WAVEMAGNET Chassis 600 KC Adj. T1,T2, T3 for maxi mum output. For I.F. Alignment 2 1 620 KC Gang wide ODe

7、n. C1C liUHl 3 535 KC - Gang Closed Adjust slug in T6 Set Oscillator to dial scale. 4 REPEAT STEPS 2 & 3 5 1260 KC 1 260 KC CIA Align loop ant. 182 收音机爱 好者资料库 RadioFans.CN VOLUME R-18, MOST-OFTEN-NEEDED 1958 RADIO SERVICING INFORMATION ZENITH RADIO Chassis 7AT42 & 7AT42Z1, Model Royal 300 (Continued from page 182) 121-8 121-22 121-70 121-71 1217 OUTPUT SCHEMATIC DIAGRAM FOR 7AT42 SCHEMATIC DIAGRAM FOR 7AT42Z1 183 收音机爱 好者资料库 RadioFans.CN