Westinghouse-Electric-Corp-H-577T4 电路原理图.pdf

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1、VOLUME R-17, MOST-OFTEN-NEEDED 1957 RADIO SERVICING INFORMATION Westioghouse Models H-574T4, H-575T4, H-576T4, H-577T4, Using Chassis Assembly V-2239-2 ALIGNMENT While making the following adjustments, keep the volume control set for maximum output and the signal generator output attenuated to weake

2、st useable signal level. Step Connect Signal Generator to Signal Generator Frequency Radio Dial 1 Stator of ant. tuning capacitor (A) through a 200 mmf capacitor 455 kc* minimum capacity 2 Radiated signal 1625 kc. minimum capacity 3 Radiated signal 1400 kc. 1400 kc. Connect V.T.V.M. Across Voice Coi

3、l and Adjust for Maximum Output Top and bottom slugs of T2 and T1 in order given Oscillator trimmer (D) Antenna trimmer (B) note: 1. ALL CAPACITANCE VALUES IN MFD AND AL RESlSTANCrVALUES IN OHMS UNLESS OTHERWISE STATED. 2. ALL VOLTAGES MEASURED FROM B USING A VTV.M. LINE VOLTAGE SET AT II? V A C REA

4、DINGS SHOULD BE AS SHOWN 20%. 3. CHASStS GROUND rb common e- -4 I2AU6 CONVERTER I2AV6 OETISI AUDIO 50C5 audio output R4 2M I i VOLUME CONTR. 4 2 j zt - XJ | .005 :_A_6i 220 MMF T470K i 6.8M ii|, 250 _ MMF _5; HI-1 005 470K | S( t MMF 1 ; TO L, HITE GREEN r- i I-T-J m $ r/ CHASSIS GND. /+l COMMON B -

5、 - - ,.11 pg-j i C _s,v 5 j Printed Board Servicing L-* | It * * To remove defective parts, apply the tip of the L“Tc,- ! Jb 7 l2AU6 soldering iron to the connection. Keep the sol- -C!-* T 4v 4 dering iron on the connection just long enough /l? -! * 3SW4 to melt the solder, then quickly brush away s

6、ol- 007 *! * der with a small glue brush. After solder has f, . j sec. j * * been removed, separate connections. If the com- v. + aT+ 4 .1! 3 ponent has bent prongs, such as IP transformers, C4A 1 coils, tube sockets etc., straighten the prongs and cut as close to the board as possible, then heat co

7、nnection and brush away all solder with , ,aAV8 , I H 4 sma11 Blue brush. ,4-/ 5Q5 . Por Quick replacement of parts, such as re- aov ssv sistors, capacitors etc., the original solder joint jti_ 3 5* lfc *mv need not be touched. If the leads of the defect- + . nixA-J-J-f-ti_ ,LUI ive part are long en

8、ough, the defective part may I wts be removed by clipping the leads near the body 95. of the defective component. The new part can be j. Bottom View soldered to the connecting wires removed from the original part. The printed board is held secure in the cabinet by a top and bottom channel molded int

9、o the cabinet. Located above the tuning shaft and concealed by the tuning knob is a single screw (No. 6/32-5/8”) which mounts the printed board to the front of the cabinet. To remove the printed board from the cabinet, remove the front control knobs then remove the screw mounting the printed board to the front of the cabinet. Remove the two self-tapping screws, interlock and back cover. The printed board can now be removed from the cabinet. Bottom View 163 收音机爱 好者资料库 RadioFans.CN