Zenith-Radio-Corp-7CT43Z1 电路原理图.pdf

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1、VOLUME R-20, MOST-OFTEN-NEEDED 1960 RADIO SERVICING INFORMATION ZENITH RADIO CORP. Model Royal 710 Chassis (Continued on page 186, over) Chassis 7CT43Z1 PRINTED CIRCUIT SERVICING Servicing printed circuit sets is, in general, mnch the same as servicing ordinary receivers. However, certain tools and

2、techniques are well suited for this type of work. The following items are especially useful: 1. Good pair of long-nose pliers. 2. Sharp wire cutters. 3. Small stiff glue brush (for solder removal). 4. Pencil type soldering iron with a small tip (25 watts or less). WARNING: Excessive heat may damage

3、the printed circuit during component replacement if a soldering pencil, iron or gun of higher wattage rating is used. ! 5. Tin leads on component before soldering. 6. Use only solder with a 63% tin 37% lead mixture which has an extremely low melting point. 7. Metal pick (soldering aid). i ALIGNMENT

4、PROCEDURE COMPONENT REPLACEMENT Resistors and capacitors should be replaced by clipping out the defective part and neatly soldering in the new part. If a unit, such as the oscillator coil or I.F. trans former, is to be removed heat the monnting lugs with a pencil type soldering iron and move them aw

5、ay from the soldered connection with a long-nose pliers or metal pick. Continue heating the lugs and brush away the molten solder with a small stiff glue brush. Remove the defective unit by lifting it off the chassis. Before in serting the new unit, be certain that the lug holes are open and free fr

6、om solder. Forcing a lug against a solder filled lug hole may break the bond between the chassis base and the printed wiring. It is, therefore, necessary to exercise care when replacing units. An open or damaged section of printed circuit wiring can be replaced by soldering a short jumper wire acros

7、s the points to be connected. Input Signal Frequency Connect Inner Conductor Connect Outer Shield From Oscillator To Conductor From Oscillator To REPEAT STEPS 2 & 3 ONE TURN LOOSELY COUPLED TO WAVEMAGNET Gang wide open Adj. Tl, T2, T3 for maxi mum output. For I.F. Alignment Set oscillator to dial sc

8、ale. Adjust T6 for maximum output while rocking gang. Adjust for maximum output regardless of dial accuracy. IZI-540RI27-I2S MIXER -(!)-(0-1 121-19 OUTPUT MATCHED MATCHED PNP TRANSISTOR -COLLECTOR BASE ROTES: All RESISTORS ARC CARIO*. ill NATT. i204 tSURlRCI WlfSS OTHCMISf SPECIFIED. Ill TOITASES Al

9、t D.C. UALESS OTMRNISf SMECIFIEO. AU COROERSERS U IN MICROFARADS URIESS OTRCIRISC SfEOFICO. O.C. V01TA4ES SHOW ARi M(A$|IR10 FROM CHASSIS II* NO SISNAl US INO AN I.C.-D.C. 0* VACUUM TUS( VOLT METER. 185 收音机爱 好者资料库 RadioFans.CN VOLUME R-20, MOST-OFTEN-NEEDED 1960 RADIO SERVICING INFORMATION ZENITH RADIO CORP Model Royal 710 Chassis 7CT43Z1 (Continued from page 185) 186 收音机爱 好者资料库 RadioFans.CN