Westinghouse-Electric-Corp-H-712P9A 电路原理图.pdf

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1、VOLUME R-23, MOST-OFTEN-NEEDED 1963 RADIO SERVICING INFORMATION WESTINGHOUSE Chassis V-2399-6, Models H-712P9A, H-713P9A (Alignment Information on the next page at right) 收音机爱 好者资料库 RadioFans.CN VOLUME R-23, MOST-OFTEN-NEEPEP 1963 RADIO SERVICING INFORMATION WESTINGHOUSE Chassis V-2399-6, Models H-7

2、12P9A, H-713P9A, Continued SIGNAL GENERATOR Use generator which provides modulated 455KC, 530-1600KC and 2.4-7.5MC frequencies. Signal output should be modulated 30%. Keep output low enough to just give an indication to avoid AVC action. INDICATOR Connect VTVM across speaker voice coil. ALIGNMENT TO

3、OLS Use insulated aligning tool that snugly fits slots in ferrite cores to prevent chipping of ferrite. A square tool (see figure 5) is required for all slug adjustments. Connect Signal Generator To: Generator Frequency C2J Setting SW1 j Setting RECEIVER - Remove chassis, speaker and battery holder

4、from cabinet. The dial background must be removed from chassis. Locate speaker close to chassis and Tl. Be sure batteries are at rated voltage (under load). Set volume control to maximum. The oscillator adjustments are critical and therefore screws and slugs should be rotated very slowly to exact al

5、ignment point. Be sure during RF align ment that hand or any metal objects on bench do not come in close contact with antenna loop. Adjust For Maximum: Top slugs of T5, T4 & T3 in order. (Reduce generator output if necessary for T4 & T3 adjustments) Rotate C27G moximum clockwise then back-off 1/2 tu

6、rn. Adjust L2. Increase generator output until imoge signal is heard. If not heard, oscillator is tuned to low side of incoming signal and L2 must be rotated counter-clockwise until imoge signol is heard. 6.5MC 2.4MC Repeat steps 4 and 5 until no further change is noted. Test point A” 1625KC open 53

7、0KC closed Repeat steps 7 and 8 until no further change is noted. Lead from Tl I 5.8MC j Tune until siar Lead from T 1 through 15 mmf capacitor. Tune until signol SW is heard. 2.6 MC Repeat steps 10 and 11 until no further change is noted. 1400KC .062 ACROSS FLATS) Figure 5 Alignment tool. /- Lead from L 1 through 200 mmf capacitor. Tune until signal BC is heard. C27E and C27B 600KC 1400KC AUDIO AUDIO AUDIO ,-c T7 OUTPUT G1 BRACKET E“ LI B r-L. II | ! T2 RF AMP 21 o 1 ffijol | C22 T5 2ND T4 1ST T3 MIXER BRACKET Figure 3 - Top view of chassis. SW-BC fl ACTUATOR 167 收音机爱 好者资料库 RadioFans.CN