RCA-Victor-Co-Inc-RGA-39W 电路原理图.pdf

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1、VOLUME R-26, MOST-OFTEN-NEEDED 1966 RADIO SERVICING INFORMATION J 1 * -if iV / * l *j / / / SJ SCe 1 ImTNMiIoa RED TO SWITCH (RCI2Z4A) 0LK TO CLOCK (RC 2248 , _. . , . (RC I224A) Chassis LayoutRC-1224 (Wtrtng Side) CHASSIS ACCESSIBILITY 1 Remove four Phillips head screws holding the rear cover Remov

2、e the rear cover. 2. Remove two Phillips head screws retaining the tuning panel to the front of the cabinet 3. Remove two Phillips head screws holding chassis retaining tabs located at rear of cabinet 4. Slide chassis rearward to remove. If necessary, unsolder speaker leads To reassemblereverse abov

3、e procedure. Oscillation on Strong Signal In a strong signal area an oscillation may be set up which will manifest itself by clamping of the A. G. C. and by causing a reverse bias to exist between the base and emitter of Q3, the first IF transistor. This condition maybe corrected by installing a fer

4、rite bead on the emitter lead of Q4, the second IF transistor. The installation of the bead is accomplished by unsoldering the emitter lead of Q4, slipping the lead through the hole in the bead, and reinserting and resoldering the lead in the board. The ferrite bead is available from Parts and Acces

5、sories under stock number 116761. M_ iv58 -1 ALIGNMENT PROCEDURE For all alignment operations connect low side of generator t chassis ground (junction of R24 and R29). Connect output indicator across speaker voice coil. Set volume control to maximum. Connect high side signal gen, to Set signal gen t

6、o Set radio dial to Adjustfor maximum output T5 (3rd IF) Stalor of CIA (RF gong) through o 0.01 mfd capocilor 455 kc (Modulated) tuning gang fully open T4 (2nd IF) T3 (Isl IF) 1620 kc (Modulaled) 1620 kc (gong open) C1B-T (Osc. lritnmer) 1400 kc 1 ifYI L. C1A-T (RF Irimmer) Short wire placed near ontenno to radiole signal (Modulated) 1 4UU KC C1C-T (Anl. trimmer) 600 kc 600 kc T2 (Osc. coil) (Moduioted) (rock gang) T1 (RF coil) Repeol above sleps as necessary for best sensitivity. 收音机爱 好者资料库 RadioFans.CN