Zenith-Radio-Corp-X514W 电路原理图.pdf

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1、VOLUME R-16, MOST-OFTEN-NEEPEP 1956 RADIO SERVICING INFORMATION COMPONENT REPLACEMENT: Resistors, capocitors and integnets should bo reploced by clipping out the defective part and neatly soldering in the new part. If o unit, such as the oscillator coil or IF transformer is to be removed, heat the m

2、ount* ing lugs with o pencil type soldering iron and move them away from the soldered connection with o long nose pliers or metol pick. Con tinue heating the lugs and brush away the molten solder with o small stiff glue brush. Remove the defective unitby lifting it off the chassis. Before inserting

3、the new unit, be certain that the lug holes ore open and free from solder. Forcing o lug against a solder filled lug hole may break the bond between the chassis bose and the printed wiring. It is, therefore, necessoiy to exercise core when replacing units. An open or damaged section of “printed”cir*

4、 cuit wiring con be reploced by soldering a short jumper wire ocross the paints to be connected. I.F. TRANSFORMERS: The I.F. transformers incorporated in this re ceiver are of the new permeability tuned type. The advantage of on I.F. transformer of this type is its extreme stability under various hu

5、midity and temperature conditions. The up per coil is the secondoiy and the lower the primary. When adjusting these I.F. transform ers, the tuning wrench 68-19 con be inserted into the top slug, rotated until maximum out put is obtained and then dropped down to the lower slug and the some operation

6、repeated; BOGS ttBEt IEBA6 I2AT6 ALL VOLTAGES MEASURED FROM COMMON RETURN TO POINTS INDICATED WITH AN AC-OC OR VACUUM TUBE VOLTMETER ALL VOLTAGES ARE DC UNLESS OTHERWISE SPECIFIED ALL RESISTORS ARES20H TO.ERANCE,1/2WATT.CARBOM UNLESS OTHERWISE SPECIFIED. -INTERLOCK PLUGS T2 2ND I.ETRANS IT PRI. BOTT

7、OM LL5 L6 SEC. TOP- CLOCK RETURN-1 SPEAKER- PLUGS -Tl 1ST. I.F. TRANS. rL3 PRI. BOTTOM hL4 SEC. TOP -ANTENNA PLUGS -L2 OSC. COIL -CIB ANT. TRIMMER -CIC OSC. TRIMMER im cou y -VOLUME CONTROL 1TUNING alignment procedure OPERATION 1 CONNECT OUMMY INPUT SIG. SET TRIMMERS PURPOSE OSCILLATOR TO fcNTENNA FREQUENCY DIAL AT Converter Grid .5 MM. 455 Kc. 600 Kc. L3.L4.L5, Align LF. for L6 max imum output One Turn Loop Coupled Loosely 1600 Kc. 1600 Kc. CIC Set Oscillator te Dial Seale. te Wove Magnet 1400 Kc. 1400 Kc. CIB Align Antenna Stage 181 收音机爱 好者资料库 RadioFans.CN